Merge branch 'master' into 'ce-3839-ci-cd-only-github-projects-fe'ce-3839-ci-cd-only-github-projects-fe

# Conflicts:
#   locale/gitlab.pot

120 files changed, 1694 insertions, 275 deletions

diff --git a/GITLAB_PAGES_VERSION b/GITLAB_PAGES_VERSION
index ee6cdce3c29..faef31a4357 100644
--- a/GITLAB_PAGES_VERSION
+++ b/GITLAB_PAGES_VERSION
@@ -1 +1 @@
-0.6.1
+0.7.0
diff --git a/GITLAB_WORKHORSE_VERSION b/GITLAB_WORKHORSE_VERSION
index 19811903a7f..fcdb2e109f6 100644
--- a/GITLAB_WORKHORSE_VERSION
+++ b/GITLAB_WORKHORSE_VERSION
@@ -1 +1 @@
-3.8.0
+4.0.0
diff --git a/Gemfile b/Gemfile
index e58218c6e04..2793463fd81 100644
--- a/Gemfile
+++ b/Gemfile
@@ -413,9 +413,7 @@ end
 
 # Gitaly GRPC client
 gem 'gitaly-proto', '~> 0.88.0', require: 'gitaly'
-# Explicitly lock grpc as we know 1.9 is bad
-# 1.10 is still being tested. See gitlab-org/gitaly#1059
-gem 'grpc', '~> 1.8.3'
+gem 'grpc', '~> 1.10.0'
 
 # Locked until https://github.com/google/protobuf/issues/4210 is closed
 gem 'google-protobuf', '= 3.5.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index bbdc48f964d..fa99ec3febe 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -345,9 +345,9 @@ GEM
     google-protobuf (3.5.1)
     googleapis-common-protos-types (1.0.1)
       google-protobuf (~> 3.0)
-    googleauth (0.5.3)
+    googleauth (0.6.2)
       faraday (~> 0.12)
-      jwt (~> 1.4)
+      jwt (>= 1.4, < 3.0)
       logging (~> 2.0)
       memoist (~> 0.12)
       multi_json (~> 1.11)
@@ -371,7 +371,7 @@ GEM
       rake
     grape_logging (1.7.0)
       grape
-    grpc (1.8.3)
+    grpc (1.10.0)
       google-protobuf (~> 3.1)
       googleapis-common-protos-types (~> 1.0.0)
       googleauth (>= 0.5.1, < 0.7)
@@ -505,7 +505,7 @@ GEM
     mini_portile2 (2.3.0)
     minitest (5.7.0)
     mousetrap-rails (1.4.6)
-    multi_json (1.12.2)
+    multi_json (1.13.1)
     multi_xml (0.6.0)
     multipart-post (2.0.0)
     mustermann (1.0.0)
@@ -648,7 +648,7 @@ GEM
       pry (~> 0.10)
     pry-rails (0.3.5)
       pry (>= 0.9.10)
-    public_suffix (3.0.0)
+    public_suffix (3.0.2)
     pyu-ruby-sasl (0.0.3.3)
     rack (1.6.8)
     rack-accept (0.4.5)
@@ -862,10 +862,10 @@ GEM
       sidekiq (>= 4.2.1)
     sidekiq-limit_fetch (3.4.0)
       sidekiq (>= 4)
-    signet (0.7.3)
+    signet (0.8.1)
       addressable (~> 2.3)
       faraday (~> 0.9)
-      jwt (~> 1.5)
+      jwt (>= 1.5, < 3.0)
       multi_json (~> 1.10)
     simple_po_parser (1.1.2)
     simplecov (0.14.1)
@@ -1078,7 +1078,7 @@ DEPENDENCIES
   grape-entity (~> 0.6.0)
   grape-route-helpers (~> 2.1.0)
   grape_logging (~> 1.7)
-  grpc (~> 1.8.3)
+  grpc (~> 1.10.0)
   haml_lint (~> 0.26.0)
   hamlit (~> 2.6.1)
   hashie-forbidden_attributes
diff --git a/PROCESS.md b/PROCESS.md
index c24210341e0..5ae191840ff 100644
--- a/PROCESS.md
+++ b/PROCESS.md
@@ -71,7 +71,7 @@ star, smile, etc.). Some good tips about code reviews can be found in our
 
 ## Feature freeze on the 7th for the release on the 22nd
 
-After 7th at 23:59 (Pacific Standard Time Zone) of each month, RC1 of the upcoming release (to be shipped on the 22nd) is created and deployed to GitLab.com and the stable branch for this release is frozen, which means master is no longer merged into it.
+After 7th at 23:59 (Pacific Time Zone) of each month, RC1 of the upcoming release (to be shipped on the 22nd) is created and deployed to GitLab.com and the stable branch for this release is frozen, which means master is no longer merged into it.
 Merge requests may still be merged into master during this period,
 but they will go into the _next_ release, unless they are manually cherry-picked into the stable branch.
 
diff --git a/app/assets/javascripts/pages/milestones/shared/components/promote_milestone_modal.vue b/app/assets/javascripts/pages/milestones/shared/components/promote_milestone_modal.vue
new file mode 100644
index 00000000000..22248418c41
--- /dev/null
+++ b/app/assets/javascripts/pages/milestones/shared/components/promote_milestone_modal.vue
@@ -0,0 +1,64 @@
+<script>
+  import axios from '~/lib/utils/axios_utils';
+  import createFlash from '~/flash';
+  import GlModal from '~/vue_shared/components/gl_modal.vue';
+  import { s__, sprintf } from '~/locale';
+  import { visitUrl } from '~/lib/utils/url_utility';
+  import eventHub from '../event_hub';
+
+  export default {
+    components: {
+      GlModal,
+    },
+    props: {
+      milestoneTitle: {
+        type: String,
+        required: true,
+      },
+      url: {
+        type: String,
+        required: true,
+      },
+    },
+    computed: {
+      title() {
+        return sprintf(s__('Milestones|Promote %{milestoneTitle} to group milestone?'), { milestoneTitle: this.milestoneTitle });
+      },
+      text() {
+        return s__(`Milestones|Promoting this milestone will make it available for all projects inside the group.
+        Existing project milestones with the same title will be merged.
+        This action cannot be reversed.`);
+      },
+    },
+    methods: {
+      onSubmit() {
+        eventHub.$emit('promoteMilestoneModal.requestStarted', this.url);
+        return axios.post(this.url, { params: { format: 'json' } })
+          .then((response) => {
+            eventHub.$emit('promoteMilestoneModal.requestFinished', { milestoneUrl: this.url, successful: true });
+            visitUrl(response.data.url);
+          })
+          .catch((error) => {
+            eventHub.$emit('promoteMilestoneModal.requestFinished', { milestoneUrl: this.url, successful: false });
+            createFlash(error);
+          });
+      },
+    },
+  };
+</script>
+<template>
+  <gl-modal
+    id="promote-milestone-modal"
+    footer-primary-button-variant="warning"
+    :footer-primary-button-text="s__('Milestones|Promote Milestone')"
+    @submit="onSubmit"
+  >
+    <template
+      slot="title"
+    >
+      {{ title }}
+    </template>
+    {{ text }}
+  </gl-modal>
+</template>
+
diff --git a/app/assets/javascripts/pages/milestones/shared/delete_milestone_modal_init.js b/app/assets/javascripts/pages/milestones/shared/delete_milestone_modal_init.js
new file mode 100644
index 00000000000..d51b5c221e3
--- /dev/null
+++ b/app/assets/javascripts/pages/milestones/shared/delete_milestone_modal_init.js
@@ -0,0 +1,84 @@
+import Vue from 'vue';
+import Translate from '~/vue_shared/translate';
+import deleteMilestoneModal from './components/delete_milestone_modal.vue';
+import eventHub from './event_hub';
+
+export default () => {
+  Vue.use(Translate);
+
+  const onRequestFinished = ({ milestoneUrl, successful }) => {
+    const button = document.querySelector(`.js-delete-milestone-button[data-milestone-url="${milestoneUrl}"]`);
+
+    if (!successful) {
+      button.removeAttribute('disabled');
+    }
+
+    button.querySelector('.js-loading-icon').classList.add('hidden');
+  };
+
+  const onRequestStarted = (milestoneUrl) => {
+    const button = document.querySelector(`.js-delete-milestone-button[data-milestone-url="${milestoneUrl}"]`);
+    button.setAttribute('disabled', '');
+    button.querySelector('.js-loading-icon').classList.remove('hidden');
+    eventHub.$once('deleteMilestoneModal.requestFinished', onRequestFinished);
+  };
+
+  const onDeleteButtonClick = (event) => {
+    const button = event.currentTarget;
+    const modalProps = {
+      milestoneId: parseInt(button.dataset.milestoneId, 10),
+      milestoneTitle: button.dataset.milestoneTitle,
+      milestoneUrl: button.dataset.milestoneUrl,
+      issueCount: parseInt(button.dataset.milestoneIssueCount, 10),
+      mergeRequestCount: parseInt(button.dataset.milestoneMergeRequestCount, 10),
+    };
+    eventHub.$once('deleteMilestoneModal.requestStarted', onRequestStarted);
+    eventHub.$emit('deleteMilestoneModal.props', modalProps);
+  };
+
+  const deleteMilestoneButtons = document.querySelectorAll('.js-delete-milestone-button');
+  deleteMilestoneButtons.forEach((button) => {
+    button.addEventListener('click', onDeleteButtonClick);
+  });
+
+  eventHub.$once('deleteMilestoneModal.mounted', () => {
+    deleteMilestoneButtons.forEach((button) => {
+      button.removeAttribute('disabled');
+    });
+  });
+
+  return new Vue({
+    el: '#delete-milestone-modal',
+    components: {
+      deleteMilestoneModal,
+    },
+    data() {
+      return {
+        modalProps: {
+          milestoneId: -1,
+          milestoneTitle: '',
+          milestoneUrl: '',
+          issueCount: -1,
+          mergeRequestCount: -1,
+        },
+      };
+    },
+    mounted() {
+      eventHub.$on('deleteMilestoneModal.props', this.setModalProps);
+      eventHub.$emit('deleteMilestoneModal.mounted');
+    },
+    beforeDestroy() {
+      eventHub.$off('deleteMilestoneModal.props', this.setModalProps);
+    },
+    methods: {
+      setModalProps(modalProps) {
+        this.modalProps = modalProps;
+      },
+    },
+    render(createElement) {
+      return createElement(deleteMilestoneModal, {
+        props: this.modalProps,
+      });
+    },
+  });
+};
diff --git a/app/assets/javascripts/pages/milestones/shared/index.js b/app/assets/javascripts/pages/milestones/shared/index.js
index 327e2cf569c..dabfe32848b 100644
--- a/app/assets/javascripts/pages/milestones/shared/index.js
+++ b/app/assets/javascripts/pages/milestones/shared/index.js
@@ -1,88 +1,7 @@
-import Vue from 'vue';
-
-import Translate from '~/vue_shared/translate';
-
-import deleteMilestoneModal from './components/delete_milestone_modal.vue';
-import eventHub from './event_hub';
+import initDeleteMilestoneModal from './delete_milestone_modal_init';
+import initPromoteMilestoneModal from './promote_milestone_modal_init';
 
 export default () => {
-  Vue.use(Translate);
-
-  const onRequestFinished = ({ milestoneUrl, successful }) => {
-    const button = document.querySelector(`.js-delete-milestone-button[data-milestone-url="${milestoneUrl}"]`);
-
-    if (!successful) {
-      button.removeAttribute('disabled');
-    }
-
-    button.querySelector('.js-loading-icon').classList.add('hidden');
-  };
-
-  const onRequestStarted = (milestoneUrl) => {
-    const button = document.querySelector(`.js-delete-milestone-button[data-milestone-url="${milestoneUrl}"]`);
-    button.setAttribute('disabled', '');
-    button.querySelector('.js-loading-icon').classList.remove('hidden');
-    eventHub.$once('deleteMilestoneModal.requestFinished', onRequestFinished);
-  };
-
-  const onDeleteButtonClick = (event) => {
-    const button = event.currentTarget;
-    const modalProps = {
-      milestoneId: parseInt(button.dataset.milestoneId, 10),
-      milestoneTitle: button.dataset.milestoneTitle,
-      milestoneUrl: button.dataset.milestoneUrl,
-      issueCount: parseInt(button.dataset.milestoneIssueCount, 10),
-      mergeRequestCount: parseInt(button.dataset.milestoneMergeRequestCount, 10),
-    };
-    eventHub.$once('deleteMilestoneModal.requestStarted', onRequestStarted);
-    eventHub.$emit('deleteMilestoneModal.props', modalProps);
-  };
-
-  const deleteMilestoneButtons = document.querySelectorAll('.js-delete-milestone-button');
-  for (let i = 0; i < deleteMilestoneButtons.length; i += 1) {
-    const button = deleteMilestoneButtons[i];
-    button.addEventListener('click', onDeleteButtonClick);
-  }
-
-  eventHub.$once('deleteMilestoneModal.mounted', () => {
-    for (let i = 0; i < deleteMilestoneButtons.length; i += 1) {
-      const button = deleteMilestoneButtons[i];
-      button.removeAttribute('disabled');
-    }
-  });
-
-  return new Vue({
-    el: '#delete-milestone-modal',
-    components: {
-      deleteMilestoneModal,
-    },
-    data() {
-      return {
-        modalProps: {
-          milestoneId: -1,
-          milestoneTitle: '',
-          milestoneUrl: '',
-          issueCount: -1,
-          mergeRequestCount: -1,
-        },
-      };
-    },
-    mounted() {
-      eventHub.$on('deleteMilestoneModal.props', this.setModalProps);
-      eventHub.$emit('deleteMilestoneModal.mounted');
-    },
-    beforeDestroy() {
-      eventHub.$off('deleteMilestoneModal.props', this.setModalProps);
-    },
-    methods: {
-      setModalProps(modalProps) {
-        this.modalProps = modalProps;
-      },
-    },
-    render(createElement) {
-      return createElement(deleteMilestoneModal, {
-        props: this.modalProps,
-      });
-    },
-  });
+  initDeleteMilestoneModal();
+  initPromoteMilestoneModal();
 };
diff --git a/app/assets/javascripts/pages/milestones/shared/promote_milestone_modal_init.js b/app/assets/javascripts/pages/milestones/shared/promote_milestone_modal_init.js
new file mode 100644
index 00000000000..d00f81c9094
--- /dev/null
+++ b/app/assets/javascripts/pages/milestones/shared/promote_milestone_modal_init.js
@@ -0,0 +1,82 @@
+import Vue from 'vue';
+import Translate from '~/vue_shared/translate';
+import PromoteMilestoneModal from './components/promote_milestone_modal.vue';
+import eventHub from './event_hub';
+
+Vue.use(Translate);
+
+export default () => {
+  const onRequestFinished = ({ milestoneUrl, successful }) => {
+    const button = document.querySelector(`.js-promote-project-milestone-button[data-url="${milestoneUrl}"]`);
+
+    if (!successful) {
+      button.removeAttribute('disabled');
+    }
+  };
+
+  const onRequestStarted = (milestoneUrl) => {
+    const button = document.querySelector(`.js-promote-project-milestone-button[data-url="${milestoneUrl}"]`);
+    button.setAttribute('disabled', '');
+    eventHub.$once('promoteMilestoneModal.requestFinished', onRequestFinished);
+  };
+
+  const onDeleteButtonClick = (event) => {
+    const button = event.currentTarget;
+    const modalProps = {
+      milestoneTitle: button.dataset.milestoneTitle,
+      url: button.dataset.url,
+    };
+    eventHub.$once('promoteMilestoneModal.requestStarted', onRequestStarted);
+    eventHub.$emit('promoteMilestoneModal.props', modalProps);
+  };
+
+  const promoteMilestoneButtons = document.querySelectorAll('.js-promote-project-milestone-button');
+  promoteMilestoneButtons.forEach((button) => {
+    button.addEventListener('click', onDeleteButtonClick);
+  });
+
+  eventHub.$once('promoteMilestoneModal.mounted', () => {
+    promoteMilestoneButtons.forEach((button) => {
+      button.removeAttribute('disabled');
+    });
+  });
+
+  const promoteMilestoneModal = document.getElementById('promote-milestone-modal');
+  let promoteMilestoneComponent;
+
+  if (promoteMilestoneModal) {
+    promoteMilestoneComponent = new Vue({
+      el: promoteMilestoneModal,
+      components: {
+        PromoteMilestoneModal,
+      },
+      data() {
+        return {
+          modalProps: {
+            milestoneTitle: '',
+            url: '',
+          },
+        };
+      },
+      mounted() {
+        eventHub.$on('promoteMilestoneModal.props', this.setModalProps);
+        eventHub.$emit('promoteMilestoneModal.mounted');
+      },
+      beforeDestroy() {
+        eventHub.$off('promoteMilestoneModal.props', this.setModalProps);
+      },
+      methods: {
+        setModalProps(modalProps) {
+          this.modalProps = modalProps;
+        },
+      },
+      render(createElement) {
+        return createElement('promote-milestone-modal', {
+          props: this.modalProps,
+        });
+      },
+    });
+  }
+
+  return promoteMilestoneComponent;
+};
diff --git a/app/assets/javascripts/pages/projects/labels/components/promote_label_modal.vue b/app/assets/javascripts/pages/projects/labels/components/promote_label_modal.vue
new file mode 100644
index 00000000000..54695dfeb99
--- /dev/null
+++ b/app/assets/javascripts/pages/projects/labels/components/promote_label_modal.vue
@@ -0,0 +1,79 @@
+<script>
+  import axios from '~/lib/utils/axios_utils';
+  import createFlash from '~/flash';
+  import GlModal from '~/vue_shared/components/gl_modal.vue';
+  import { s__, sprintf } from '~/locale';
+  import { visitUrl } from '~/lib/utils/url_utility';
+  import eventHub from '../event_hub';
+
+  export default {
+    components: {
+      GlModal,
+    },
+    props: {
+      url: {
+        type: String,
+        required: true,
+      },
+      labelTitle: {
+        type: String,
+        required: true,
+      },
+      labelColor: {
+        type: String,
+        required: true,
+      },
+      labelTextColor: {
+        type: String,
+        required: true,
+      },
+    },
+    computed: {
+      text() {
+        return s__(`Milestones|Promoting this label will make it available for all projects inside the group. 
+        Existing project labels with the same title will be merged. This action cannot be reversed.`);
+      },
+      title() {
+        const label = `<span
+          class="label color-label"
+          style="background-color: ${this.labelColor}; color: ${this.labelTextColor};"
+        >${this.labelTitle}</span>`;
+
+        return sprintf(s__('Labels|Promote label %{labelTitle} to Group Label?'), {
+          labelTitle: label,
+        }, false);
+      },
+    },
+    methods: {
+      onSubmit() {
+        eventHub.$emit('promoteLabelModal.requestStarted', this.url);
+        return axios.post(this.url, { params: { format: 'json' } })
+          .then((response) => {
+            eventHub.$emit('promoteLabelModal.requestFinished', { labelUrl: this.url, successful: true });
+            visitUrl(response.data.url);
+          })
+          .catch((error) => {
+            eventHub.$emit('promoteLabelModal.requestFinished', { labelUrl: this.url, successful: false });
+            createFlash(error);
+          });
+      },
+    },
+  };
+</script>
+<template>
+  <gl-modal
+    id="promote-label-modal"
+    footer-primary-button-variant="warning"
+    :footer-primary-button-text="s__('Labels|Promote Label')"
+    @submit="onSubmit"
+  >
+    <div
+      slot="title"
+      v-html="title"
+    >
+      {{ title }}
+    </div>
+
+    {{ text }}
+  </gl-modal>
+</template>
diff --git a/app/assets/javascripts/pages/projects/labels/event_hub.js b/app/assets/javascripts/pages/projects/labels/event_hub.js
new file mode 100644
index 00000000000..0948c2e5352
--- /dev/null
+++ b/app/assets/javascripts/pages/projects/labels/event_hub.js
@@ -0,0 +1,3 @@
+import Vue from 'vue';
+
+export default new Vue();
diff --git a/app/assets/javascripts/pages/projects/labels/index/index.js b/app/assets/javascripts/pages/projects/labels/index/index.js
index 6e45de2a724..2abcbfab1ed 100644
--- a/app/assets/javascripts/pages/projects/labels/index/index.js
+++ b/app/assets/javascripts/pages/projects/labels/index/index.js
@@ -1,3 +1,91 @@
+import Vue from 'vue';
+import Translate from '~/vue_shared/translate';
 import initLabels from '~/init_labels';
+import eventHub from '../event_hub';
+import PromoteLabelModal from '../components/promote_label_modal.vue';
 
-document.addEventListener('DOMContentLoaded', initLabels);
+Vue.use(Translate);
+
+const initLabelIndex = () => {
+  initLabels();
+
+  const onRequestFinished = ({ labelUrl, successful }) => {
+    const button = document.querySelector(`.js-promote-project-label-button[data-url="${labelUrl}"]`);
+
+    if (!successful) {
+      button.removeAttribute('disabled');
+    }
+  };
+
+  const onRequestStarted = (labelUrl) => {
+    const button = document.querySelector(`.js-promote-project-label-button[data-url="${labelUrl}"]`);
+    button.setAttribute('disabled', '');
+    eventHub.$once('promoteLabelModal.requestFinished', onRequestFinished);
+  };
+
+  const onDeleteButtonClick = (event) => {
+    const button = event.currentTarget;
+    const modalProps = {
+      labelTitle: button.dataset.labelTitle,
+      labelColor: button.dataset.labelColor,
+      labelTextColor: button.dataset.labelTextColor,
+      url: button.dataset.url,
+    };
+    eventHub.$once('promoteLabelModal.requestStarted', onRequestStarted);
+    eventHub.$emit('promoteLabelModal.props', modalProps);
+  };
+
+  const promoteLabelButtons = document.querySelectorAll('.js-promote-project-label-button');
+  promoteLabelButtons.forEach((button) => {
+    button.addEventListener('click', onDeleteButtonClick);
+  });
+
+  eventHub.$once('promoteLabelModal.mounted', () => {
+    promoteLabelButtons.forEach((button) => {
+      button.removeAttribute('disabled');
+    });
+  });
+
+  const promoteLabelModal = document.getElementById('promote-label-modal');
+  let promoteLabelModalComponent;
+
+  if (promoteLabelModal) {
+    promoteLabelModalComponent = new Vue({
+      el: promoteLabelModal,
+      components: {
+        PromoteLabelModal,
+      },
+      data() {
+        return {
+          modalProps: {
+            labelTitle: '',
+            labelColor: '',
+            labelTextColor: '',
+            url: '',
+          },
+        };
+      },
+      mounted() {
+        eventHub.$on('promoteLabelModal.props', this.setModalProps);
+        eventHub.$emit('promoteLabelModal.mounted');
+      },
+      beforeDestroy() {
+        eventHub.$off('promoteLabelModal.props', this.setModalProps);
+      },
+      methods: {
+        setModalProps(modalProps) {
+          this.modalProps = modalProps;
+        },
+      },
+      render(createElement) {
+        return createElement('promote-label-modal', {
+          props: this.modalProps,
+        });
+      },
+    });
+  }
+
+  return promoteLabelModalComponent;
+};
+
+document.addEventListener('DOMContentLoaded', initLabelIndex);
diff --git a/app/assets/javascripts/terminal/terminal.js b/app/assets/javascripts/terminal/terminal.js
index 6b9422b1816..904b0093f7b 100644
--- a/app/assets/javascripts/terminal/terminal.js
+++ b/app/assets/javascripts/terminal/terminal.js
@@ -6,8 +6,14 @@
     constructor(options) {
       this.options = options || {};
 
-      this.options.cursorBlink = options.cursorBlink || true;
-      this.options.screenKeys = options.screenKeys || true;
+      if (!Object.prototype.hasOwnProperty.call(this.options, 'cursorBlink')) {
+        this.options.cursorBlink = true;
+      }
+
+      if (!Object.prototype.hasOwnProperty.call(this.options, 'screenKeys')) {
+        this.options.screenKeys = true;
+      }
+
       this.container = document.querySelector(options.selector);
 
       this.setSocketUrl();
diff --git a/app/assets/javascripts/vue_merge_request_widget/components/mr_widget_maintainer_edit.vue b/app/assets/javascripts/vue_merge_request_widget/components/mr_widget_maintainer_edit.vue
new file mode 100644
index 00000000000..7a69cce695e
--- /dev/null
+++ b/app/assets/javascripts/vue_merge_request_widget/components/mr_widget_maintainer_edit.vue
@@ -0,0 +1,19 @@
+<script>
+  export default {
+    name: 'MRWidgetMaintainerEdit',
+    props: {
+      maintainerEditAllowed: {
+        type: Boolean,
+        default: false,
+        required: false,
+      },
+    },
+  };
+</script>
+<template>
+  <section class="mr-info-list mr-maintainer-edit">
+    <p v-if="maintainerEditAllowed">
+      {{ s__("mrWidget|Allows edits from maintainers") }}
+    </p>
+  </section>
+</template>
diff --git a/app/assets/javascripts/vue_merge_request_widget/dependencies.js b/app/assets/javascripts/vue_merge_request_widget/dependencies.js
index edb3baa39e4..a1bc28873df 100644
--- a/app/assets/javascripts/vue_merge_request_widget/dependencies.js
+++ b/app/assets/javascripts/vue_merge_request_widget/dependencies.js
@@ -15,6 +15,7 @@ export { default as WidgetHeader } from './components/mr_widget_header.vue';
 export { default as WidgetMergeHelp } from './components/mr_widget_merge_help.vue';
 export { default as WidgetPipeline } from './components/mr_widget_pipeline.vue';
 export { default as WidgetDeployment } from './components/mr_widget_deployment';
+export { default as WidgetMaintainerEdit } from './components/mr_widget_maintainer_edit.vue';
 export { default as WidgetRelatedLinks } from './components/mr_widget_related_links.vue';
 export { default as MergedState } from './components/states/mr_widget_merged.vue';
 export { default as FailedToMerge } from './components/states/mr_widget_failed_to_merge.vue';
diff --git a/app/assets/javascripts/vue_merge_request_widget/mr_widget_options.js b/app/assets/javascripts/vue_merge_request_widget/mr_widget_options.js
index 797f0f6ec0f..df3eb86f35c 100644
--- a/app/assets/javascripts/vue_merge_request_widget/mr_widget_options.js
+++ b/app/assets/javascripts/vue_merge_request_widget/mr_widget_options.js
@@ -6,6 +6,7 @@ import {
   WidgetMergeHelp,
   WidgetPipeline,
   WidgetDeployment,
+  WidgetMaintainerEdit,
   WidgetRelatedLinks,
   MergedState,
   ClosedState,
@@ -211,6 +212,7 @@ export default {
     'mr-widget-merge-help': WidgetMergeHelp,
     'mr-widget-pipeline': WidgetPipeline,
     'mr-widget-deployment': WidgetDeployment,
+    'mr-widget-maintainer-edit': WidgetMaintainerEdit,
     'mr-widget-related-links': WidgetRelatedLinks,
     'mr-widget-merged': MergedState,
     'mr-widget-closed': ClosedState,
@@ -251,11 +253,12 @@ export default {
           :is="componentName"
           :mr="mr"
           :service="service" />
+        <mr-widget-maintainer-edit
+          :maintainerEditAllowed="mr.maintainerEditAllowed" />
         <mr-widget-related-links
           v-if="shouldRenderRelatedLinks"
           :state="mr.state"
-          :related-links="mr.relatedLinks"
-          />
+          :related-links="mr.relatedLinks" />
       </div>
       <div
         class="mr-widget-footer"
diff --git a/app/assets/javascripts/vue_merge_request_widget/stores/mr_widget_store.js b/app/assets/javascripts/vue_merge_request_widget/stores/mr_widget_store.js
index 9a750ce42bd..5d07bcf1bb9 100644
--- a/app/assets/javascripts/vue_merge_request_widget/stores/mr_widget_store.js
+++ b/app/assets/javascripts/vue_merge_request_widget/stores/mr_widget_store.js
@@ -76,6 +76,7 @@ export default class MergeRequestStore {
     this.canBeMerged = data.can_be_merged || false;
     this.isMergeAllowed = data.mergeable || false;
     this.mergeOngoing = data.merge_ongoing;
+    this.maintainerEditAllowed = data.allow_maintainer_to_push;
 
     // Cherry-pick and Revert actions related
     this.canCherryPickInCurrentMR = currentUser.can_cherry_pick_on_current_merge_request || false;
diff --git a/app/assets/stylesheets/framework/dropdowns.scss b/app/assets/stylesheets/framework/dropdowns.scss
index 1d7b0b602cc..127583626cf 100644
--- a/app/assets/stylesheets/framework/dropdowns.scss
+++ b/app/assets/stylesheets/framework/dropdowns.scss
@@ -272,7 +272,7 @@
 
   .divider {
     height: 1px;
-    margin: 6px 0;
+    margin: #{$grid-size / 2} 0;
     padding: 0;
     background-color: $dropdown-divider-color;
 
diff --git a/app/assets/stylesheets/framework/modal.scss b/app/assets/stylesheets/framework/modal.scss
index a6b1bf9b099..48b981dd31f 100644
--- a/app/assets/stylesheets/framework/modal.scss
+++ b/app/assets/stylesheets/framework/modal.scss
@@ -2,14 +2,17 @@
   background-color: $modal-body-bg;
   padding: #{3 * $grid-size} #{2 * $grid-size};
 
-  .page-title {
-    margin-top: 0;
-
+  .page-title,
+  .modal-title {
     .color-label {
       font-size: $gl-font-size;
       padding: $gl-vert-padding $label-padding-modal;
     }
   }
+
+  .page-title {
+    margin-top: 0;
+  }
 }
 
 .modal-body {
diff --git a/app/assets/stylesheets/pages/merge_requests.scss b/app/assets/stylesheets/pages/merge_requests.scss
index f887a11004f..f8708a2c0a3 100644
--- a/app/assets/stylesheets/pages/merge_requests.scss
+++ b/app/assets/stylesheets/pages/merge_requests.scss
@@ -453,7 +453,8 @@
   }
 }
 
-.mr-links {
+.mr-links,
+.mr-maintainer-edit {
   padding-left: $status-icon-size + $status-icon-margin;
 }
 
diff --git a/app/controllers/concerns/creates_commit.rb b/app/controllers/concerns/creates_commit.rb
index 6f4fdcdaa4f..b26a76d2b62 100644
--- a/app/controllers/concerns/creates_commit.rb
+++ b/app/controllers/concerns/creates_commit.rb
@@ -4,7 +4,7 @@ module CreatesCommit
 
   # rubocop:disable Gitlab/ModuleWithInstanceVariables
   def create_commit(service, success_path:, failure_path:, failure_view: nil, success_notice: nil)
-    if can?(current_user, :push_code, @project)
+    if user_access(@project).can_push_to_branch?(branch_name_or_ref)
       @project_to_commit_into = @project
       @branch_name ||= @ref
     else
@@ -50,7 +50,7 @@ module CreatesCommit
   # rubocop:enable Gitlab/ModuleWithInstanceVariables
 
   def authorize_edit_tree!
-    return if can_collaborate_with_project?
+    return if can_collaborate_with_project?(project, ref: branch_name_or_ref)
 
     access_denied!
   end
@@ -123,4 +123,8 @@ module CreatesCommit
     params[:create_merge_request].present? &&
       (different_project? || @start_branch != @branch_name) # rubocop:disable Gitlab/ModuleWithInstanceVariables
   end
+
+  def branch_name_or_ref
+    @branch_name || @ref # rubocop:disable Gitlab/ModuleWithInstanceVariables
+  end
 end
diff --git a/app/controllers/projects/application_controller.rb b/app/controllers/projects/application_controller.rb
index 6025a40348b..6d9b42a2c04 100644
--- a/app/controllers/projects/application_controller.rb
+++ b/app/controllers/projects/application_controller.rb
@@ -6,7 +6,7 @@ class Projects::ApplicationController < ApplicationController
   before_action :repository
   layout 'project'
 
-  helper_method :repository, :can_collaborate_with_project?
+  helper_method :repository, :can_collaborate_with_project?, :user_access
 
   private
 
@@ -31,11 +31,12 @@ class Projects::ApplicationController < ApplicationController
     @repository ||= project.repository
   end
 
-  def can_collaborate_with_project?(project = nil)
+  def can_collaborate_with_project?(project = nil, ref: nil)
     project ||= @project
 
     can?(current_user, :push_code, project) ||
-      (current_user && current_user.already_forked?(project))
+      (current_user && current_user.already_forked?(project)) ||
+      user_access(project).can_push_to_branch?(ref)
   end
 
   def authorize_action!(action)
@@ -90,4 +91,9 @@ class Projects::ApplicationController < ApplicationController
   def check_issues_available!
     return render_404 unless @project.feature_available?(:issues, current_user)
   end
+
+  def user_access(project)
+    @user_access ||= {}
+    @user_access[project] ||= Gitlab::UserAccess.new(current_user, project: project)
+  end
 end
diff --git a/app/controllers/projects/blob_controller.rb b/app/controllers/projects/blob_controller.rb
index 405726c017c..0c1c286a0a4 100644
--- a/app/controllers/projects/blob_controller.rb
+++ b/app/controllers/projects/blob_controller.rb
@@ -9,8 +9,12 @@ class Projects::BlobController < Projects::ApplicationController
 
   before_action :require_non_empty_project, except: [:new, :create]
   before_action :authorize_download_code!
-  before_action :authorize_edit_tree!, only: [:new, :create, :update, :destroy]
+
+  # We need to assign the blob vars before `authorize_edit_tree!` so we can
+  # validate access to a specific ref.
   before_action :assign_blob_vars
+  before_action :authorize_edit_tree!, only: [:new, :create, :update, :destroy]
+
   before_action :commit, except: [:new, :create]
   before_action :blob, except: [:new, :create]
   before_action :require_branch_head, only: [:edit, :update]
@@ -46,7 +50,7 @@ class Projects::BlobController < Projects::ApplicationController
   end
 
   def edit
-    if can_collaborate_with_project?
+    if can_collaborate_with_project?(project, ref: @ref)
       blob.load_all_data!
     else
       redirect_to action: 'show'
diff --git a/app/controllers/projects/labels_controller.rb b/app/controllers/projects/labels_controller.rb
index e0f4710175f..99790b8e7e8 100644
--- a/app/controllers/projects/labels_controller.rb
+++ b/app/controllers/projects/labels_controller.rb
@@ -112,12 +112,14 @@ class Projects::LabelsController < Projects::ApplicationController
     begin
       return render_404 unless promote_service.execute(@label)
 
+      flash[:notice] = "#{@label.title} promoted to group label."
       respond_to do |format|
         format.html do
-          redirect_to(project_labels_path(@project),
-                      notice: 'Label was promoted to a Group Label')
+          redirect_to(project_labels_path(@project), status: 303)
+        end
+        format.json do
+          render json: { url: project_labels_path(@project) }
         end
-        format.js
       end
     rescue ActiveRecord::RecordInvalid => e
       Gitlab::AppLogger.error "Failed to promote label \"#{@label.title}\" to group label"
diff --git a/app/controllers/projects/merge_requests/application_controller.rb b/app/controllers/projects/merge_requests/application_controller.rb
index 793ae03fb88..67d4ea2ca8f 100644
--- a/app/controllers/projects/merge_requests/application_controller.rb
+++ b/app/controllers/projects/merge_requests/application_controller.rb
@@ -15,6 +15,7 @@ class Projects::MergeRequests::ApplicationController < Projects::ApplicationCont
 
   def merge_request_params_attributes
     [
+      :allow_maintainer_to_push,
       :assignee_id,
       :description,
       :force_remove_source_branch,
diff --git a/app/controllers/projects/milestones_controller.rb b/app/controllers/projects/milestones_controller.rb
index 75b17d05e22..ff93147d00f 100644
--- a/app/controllers/projects/milestones_controller.rb
+++ b/app/controllers/projects/milestones_controller.rb
@@ -70,9 +70,17 @@ class Projects::MilestonesController < Projects::ApplicationController
   end
 
   def promote
-    promoted_milestone = Milestones::PromoteService.new(project, current_user).execute(milestone)
-    flash[:notice] = "Milestone has been promoted to group milestone."
-    redirect_to group_milestone_path(project.group, promoted_milestone.iid)
+    Milestones::PromoteService.new(project, current_user).execute(milestone)
+
+    flash[:notice] = "#{milestone.title} promoted to group milestone"
+    respond_to do |format|
+      format.html do
+        redirect_to project_milestones_path(project)
+      end
+      format.json do
+        render json: { url: project_milestones_path(project) }
+      end
+    end
   rescue Milestones::PromoteService::PromoteMilestoneError => error
     redirect_to milestone, alert: error.message
   end
diff --git a/app/helpers/merge_requests_helper.rb b/app/helpers/merge_requests_helper.rb
index ce57422f45d..fb4fe1c40b7 100644
--- a/app/helpers/merge_requests_helper.rb
+++ b/app/helpers/merge_requests_helper.rb
@@ -125,6 +125,19 @@ module MergeRequestsHelper
     link_to(url[merge_request.project, merge_request], data: data_attrs, &block)
   end
 
+  def allow_maintainer_push_unavailable_reason(merge_request)
+    return if merge_request.can_allow_maintainer_to_push?(current_user)
+
+    minimum_visibility = [merge_request.target_project.visibility_level,
+                          merge_request.source_project.visibility_level].min
+
+    if minimum_visibility < Gitlab::VisibilityLevel::INTERNAL
+      _('Not available for private projects')
+    elsif ProtectedBranch.protected?(merge_request.source_project, merge_request.source_branch)
+      _('Not available for protected branches')
+    end
+  end
+
   def merge_params_ee(merge_request)
     {}
   end
diff --git a/app/helpers/tree_helper.rb b/app/helpers/tree_helper.rb
index f6a6d9bebde..b64be89c181 100644
--- a/app/helpers/tree_helper.rb
+++ b/app/helpers/tree_helper.rb
@@ -49,15 +49,13 @@ module TreeHelper
 
     return false unless on_top_of_branch?(project, ref)
 
-    can_collaborate_with_project?(project)
+    can_collaborate_with_project?(project, ref: ref)
   end
 
   def tree_edit_branch(project = @project, ref = @ref)
     return unless can_edit_tree?(project, ref)
 
-    project = project.present(current_user: current_user)
-
-    if project.can_current_user_push_to_branch?(ref)
+    if user_access(project).can_push_to_branch?(ref)
       ref
     else
       project = tree_edit_project(project)
@@ -88,7 +86,16 @@ module TreeHelper
   end
 
   def commit_in_fork_help
-    "A new branch will be created in your fork and a new merge request will be started."
+    _("A new branch will be created in your fork and a new merge request will be started.")
+  end
+
+  def commit_in_single_accessible_branch
+    branch_name = html_escape(selected_branch)
+
+    message = _("Your changes can be committed to %{branch_name} because a merge "\
+                "request is open.") % { branch_name: "<strong>#{branch_name}</strong>" }
+
+    message.html_safe
   end
 
   def path_breadcrumbs(max_links = 6)
@@ -125,4 +132,8 @@ module TreeHelper
       return tree.name
     end
   end
+
+  def selected_branch
+    @branch_name || tree_edit_branch
+  end
 end
diff --git a/app/mailers/notify.rb b/app/mailers/notify.rb
index 45d4fb451d8..e4212775956 100644
--- a/app/mailers/notify.rb
+++ b/app/mailers/notify.rb
@@ -117,7 +117,7 @@ class Notify < BaseMailer
 
     if Gitlab::IncomingEmail.enabled? && @sent_notification
       address = Mail::Address.new(Gitlab::IncomingEmail.reply_address(reply_key))
-      address.display_name = @project.name_with_namespace
+      address.display_name = @project.full_name
 
       headers['Reply-To'] = address
 
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index 9a7e66a9cbb..c2bae379a94 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -865,7 +865,7 @@ class MergeRequest < ActiveRecord::Base
 
   def can_be_merged_by?(user)
     access = ::Gitlab::UserAccess.new(user, project: project)
-    access.can_push_to_branch?(target_branch) || access.can_merge_to_branch?(target_branch)
+    access.can_update_branch?(target_branch)
   end
 
   def can_be_merged_via_command_line_by?(user)
@@ -1087,4 +1087,22 @@ class MergeRequest < ActiveRecord::Base
 
     project.merge_requests.merged.where(author_id: author_id).empty?
   end
+
+  def allow_maintainer_to_push
+    maintainer_push_possible? && super
+  end
+
+  alias_method :allow_maintainer_to_push?, :allow_maintainer_to_push
+
+  def maintainer_push_possible?
+    source_project.present? && for_fork? &&
+      target_project.visibility_level > Gitlab::VisibilityLevel::PRIVATE &&
+      source_project.visibility_level > Gitlab::VisibilityLevel::PRIVATE &&
+      !ProtectedBranch.protected?(source_project, source_branch)
+  end
+
+  def can_allow_maintainer_to_push?(user)
+    maintainer_push_possible? &&
+      Ability.allowed?(user, :push_code, source_project)
+  end
 end
diff --git a/app/models/project.rb b/app/models/project.rb
index 5cd1da43645..5f9d9785d64 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -150,6 +150,7 @@ class Project < ActiveRecord::Base
 
   # Merge Requests for target project should be removed with it
   has_many :merge_requests, foreign_key: 'target_project_id'
+  has_many :source_of_merge_requests, foreign_key: 'source_project_id', class_name: 'MergeRequest'
   has_many :issues
   has_many :labels, class_name: 'ProjectLabel'
   has_many :services
@@ -1799,6 +1800,33 @@ class Project < ActiveRecord::Base
     Badge.where("id IN (#{union.to_sql})") # rubocop:disable GitlabSecurity/SqlInjection
   end
 
+  def merge_requests_allowing_push_to_user(user)
+    return MergeRequest.none unless user
+
+    developer_access_exists = user.project_authorizations
+                                .where('access_level >= ? ', Gitlab::Access::DEVELOPER)
+                                .where('project_authorizations.project_id = merge_requests.target_project_id')
+                                .limit(1)
+                                .select(1)
+    source_of_merge_requests.opened
+      .where(allow_maintainer_to_push: true)
+      .where('EXISTS (?)', developer_access_exists)
+  end
+
+  def branch_allows_maintainer_push?(user, branch_name)
+    return false unless user
+
+    cache_key = "user:#{user.id}:#{branch_name}:branch_allows_push"
+
+    memoized_results = strong_memoize(:branch_allows_maintainer_push) do
+      Hash.new do |result, cache_key|
+        result[cache_key] = fetch_branch_allows_maintainer_push?(user, branch_name)
+      end
+    end
+
+    memoized_results[cache_key]
+  end
+
   private
 
   def storage
@@ -1921,4 +1949,22 @@ class Project < ActiveRecord::Base
 
     raise ex
   end
+
+  def fetch_branch_allows_maintainer_push?(user, branch_name)
+    check_access = -> do
+      merge_request = source_of_merge_requests.opened
+                        .where(allow_maintainer_to_push: true)
+                        .find_by(source_branch: branch_name)
+
+      merge_request&.can_be_merged_by?(user)
+    end
+
+    if RequestStore.active?
+      RequestStore.fetch("project-#{id}:branch-#{branch_name}:user-#{user.id}:branch_allows_maintainer_push") do
+        check_access.call
+      end
+    else
+      check_access.call
+    end
+  end
 end
diff --git a/app/models/repository.rb b/app/models/repository.rb
index e6b88320110..461dfbec2bc 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -651,14 +651,15 @@ class Repository
   end
 
   def last_commit_for_path(sha, path)
-    commit_by(oid: last_commit_id_for_path(sha, path))
+    commit = raw_repository.last_commit_for_path(sha, path)
+    ::Commit.new(commit, @project) if commit
   end
 
   def last_commit_id_for_path(sha, path)
     key = path.blank? ? "last_commit_id_for_path:#{sha}" : "last_commit_id_for_path:#{sha}:#{Digest::SHA1.hexdigest(path)}"
 
     cache.fetch(key) do
-      raw_repository.last_commit_id_for_path(sha, path)
+      last_commit_for_path(sha, path)&.id
     end
   end
 
diff --git a/app/policies/project_policy.rb b/app/policies/project_policy.rb
index 3b0550b4dd6..57ab0c23dcd 100644
--- a/app/policies/project_policy.rb
+++ b/app/policies/project_policy.rb
@@ -61,6 +61,11 @@ class ProjectPolicy < BasePolicy
   desc "Project has request access enabled"
   condition(:request_access_enabled, scope: :subject) { project.request_access_enabled }
 
+  desc "Has merge requests allowing pushes to user"
+  condition(:has_merge_requests_allowing_pushes, scope: :subject) do
+    project.merge_requests_allowing_push_to_user(user).any?
+  end
+
   features = %w[
     merge_requests
     issues
@@ -291,6 +296,15 @@ class ProjectPolicy < BasePolicy
     prevent :read_issue
   end
 
+  # These rules are included to allow maintainers of projects to push to certain
+  # to run pipelines for the branches they have access to.
+  rule { can?(:public_access) & has_merge_requests_allowing_pushes }.policy do
+    enable :create_build
+    enable :update_build
+    enable :create_pipeline
+    enable :update_pipeline
+  end
+
   private
 
   def team_member?
diff --git a/app/presenters/merge_request_presenter.rb b/app/presenters/merge_request_presenter.rb
index 08ae49562c7..9f3f2637183 100644
--- a/app/presenters/merge_request_presenter.rb
+++ b/app/presenters/merge_request_presenter.rb
@@ -78,7 +78,7 @@ class MergeRequestPresenter < Gitlab::View::Presenter::Delegated
   end
 
   def rebase_path
-    if !rebase_in_progress? && should_be_rebased? && user_can_push_to_source_branch?
+    if !rebase_in_progress? && should_be_rebased? && can_push_to_source_branch?
       rebase_project_merge_request_path(project, merge_request)
     end
   end
@@ -160,7 +160,11 @@ class MergeRequestPresenter < Gitlab::View::Presenter::Delegated
   end
 
   def can_push_to_source_branch?
-    source_branch_exists? && user_can_push_to_source_branch?
+    return false unless source_branch_exists?
+
+    !!::Gitlab::UserAccess
+      .new(current_user, project: source_project)
+      .can_push_to_branch?(source_branch)
   end
 
   private
@@ -191,17 +195,10 @@ class MergeRequestPresenter < Gitlab::View::Presenter::Delegated
     end.sort.to_sentence
   end
 
-  def user_can_push_to_source_branch?
-    return false unless source_branch_exists?
-
-    ::Gitlab::UserAccess
-      .new(current_user, project: source_project)
-      .can_push_to_branch?(source_branch)
-  end
-
   def user_can_collaborate_with_project?
     can?(current_user, :push_code, project) ||
-      (current_user && current_user.already_forked?(project))
+      (current_user && current_user.already_forked?(project)) ||
+      can_push_to_source_branch?
   end
 
   def user_can_fork_project?
diff --git a/app/serializers/merge_request_widget_entity.rb b/app/serializers/merge_request_widget_entity.rb
index a3ebec0efc6..4a812e39ee1 100644
--- a/app/serializers/merge_request_widget_entity.rb
+++ b/app/serializers/merge_request_widget_entity.rb
@@ -11,6 +11,7 @@ class MergeRequestWidgetEntity < IssuableEntity
   expose :source_project_id
   expose :target_branch
   expose :target_project_id
+  expose :allow_maintainer_to_push
 
   expose :should_be_rebased?, as: :should_be_rebased
   expose :ff_only_enabled do |merge_request|
@@ -29,6 +30,7 @@ class MergeRequestWidgetEntity < IssuableEntity
   expose :can_push_to_source_branch do |merge_request|
     presenter(merge_request).can_push_to_source_branch?
   end
+
   expose :rebase_path do |merge_request|
     presenter(merge_request).rebase_path
   end
@@ -136,8 +138,8 @@ class MergeRequestWidgetEntity < IssuableEntity
   end
 
   expose :new_blob_path do |merge_request|
-    if can?(current_user, :push_code, merge_request.project)
-      project_new_blob_path(merge_request.project, merge_request.source_branch)
+    if presenter(merge_request).can_push_to_source_branch?
+      project_new_blob_path(merge_request.source_project, merge_request.source_branch)
     end
   end
 
diff --git a/app/services/ci/create_pipeline_service.rb b/app/services/ci/create_pipeline_service.rb
index c8b112132b3..3b3d9239086 100644
--- a/app/services/ci/create_pipeline_service.rb
+++ b/app/services/ci/create_pipeline_service.rb
@@ -81,7 +81,7 @@ module Ci
     end
 
     def related_merge_requests
-      MergeRequest.opened.where(source_project: pipeline.project, source_branch: pipeline.ref)
+      pipeline.project.source_of_merge_requests.opened.where(source_branch: pipeline.ref)
     end
   end
 end
diff --git a/app/services/merge_requests/base_service.rb b/app/services/merge_requests/base_service.rb
index 23262b62615..231ab76fde4 100644
--- a/app/services/merge_requests/base_service.rb
+++ b/app/services/merge_requests/base_service.rb
@@ -35,6 +35,14 @@ module MergeRequests
       end
     end
 
+    def filter_params(merge_request)
+      super
+
+      unless merge_request.can_allow_maintainer_to_push?(current_user)
+        params.delete(:allow_maintainer_to_push)
+      end
+    end
+
     def merge_request_metrics_service(merge_request)
       MergeRequestMetricsService.new(merge_request.metrics)
     end
diff --git a/app/services/merge_requests/build_service.rb b/app/services/merge_requests/build_service.rb
index 4b186d93772..a98bbdf74dd 100644
--- a/app/services/merge_requests/build_service.rb
+++ b/app/services/merge_requests/build_service.rb
@@ -6,6 +6,7 @@ module MergeRequests
       @params_issue_iid = params.delete(:issue_iid)
 
       self.merge_request = MergeRequest.new(params)
+      merge_request.author = current_user
       merge_request.compare_commits = []
       merge_request.source_project  = find_source_project
       merge_request.target_project  = find_target_project
diff --git a/app/services/projects/create_service.rb b/app/services/projects/create_service.rb
index 01838ec6b5d..7fa1387084c 100644
--- a/app/services/projects/create_service.rb
+++ b/app/services/projects/create_service.rb
@@ -85,7 +85,7 @@ module Projects
     end
 
     def after_create_actions
-      log_info("#{@project.owner.name} created a new project \"#{@project.name_with_namespace}\"")
+      log_info("#{@project.owner.name} created a new project \"#{@project.full_name}\"")
 
       unless @project.gitlab_project_import?
         @project.write_repository_config
diff --git a/app/views/projects/_commit_button.html.haml b/app/views/projects/_commit_button.html.haml
index b55dc3dce5c..b387e38c1a6 100644
--- a/app/views/projects/_commit_button.html.haml
+++ b/app/views/projects/_commit_button.html.haml
@@ -3,6 +3,4 @@
   = link_to 'Cancel', cancel_path,
             class: 'btn btn-cancel', data: {confirm: leave_edit_message}
 
-  - unless can?(current_user, :push_code, @project)
-    .inline.prepend-left-10
-      = commit_in_fork_help
+  = render 'shared/projects/edit_information'
diff --git a/app/views/projects/blob/_new_dir.html.haml b/app/views/projects/blob/_new_dir.html.haml
index 5d48a35dc4c..48ff66900be 100644
--- a/app/views/projects/blob/_new_dir.html.haml
+++ b/app/views/projects/blob/_new_dir.html.haml
@@ -17,6 +17,4 @@
             = submit_tag _("Create directory"), class: 'btn btn-create'
             = link_to "Cancel", '#', class: "btn btn-cancel", "data-dismiss" => "modal"
 
-            - unless can?(current_user, :push_code, @project)
-              .inline.prepend-left-10
-                = commit_in_fork_help
+            = render 'shared/projects/edit_information'
diff --git a/app/views/projects/blob/_upload.html.haml b/app/views/projects/blob/_upload.html.haml
index f1324c61500..182d02376bf 100644
--- a/app/views/projects/blob/_upload.html.haml
+++ b/app/views/projects/blob/_upload.html.haml
@@ -24,6 +24,4 @@
               = button_title
             = link_to _("Cancel"), '#', class: "btn btn-cancel", "data-dismiss" => "modal"
 
-            - unless can?(current_user, :push_code, @project)
-              .inline.prepend-left-10
-                = commit_in_fork_help
+            = render 'shared/projects/edit_information'
diff --git a/app/views/projects/commit/_change.html.haml b/app/views/projects/commit/_change.html.haml
index 93407956f56..21e4664d4e4 100644
--- a/app/views/projects/commit/_change.html.haml
+++ b/app/views/projects/commit/_change.html.haml
@@ -35,6 +35,4 @@
             = submit_tag label, class: 'btn btn-create'
             = link_to _("Cancel"), '#', class: "btn btn-cancel", "data-dismiss" => "modal"
 
-            - unless can?(current_user, :push_code, @project)
-              .inline.prepend-left-10
-                = commit_in_fork_help
+            = render 'shared/projects/edit_information'
diff --git a/app/views/projects/labels/index.html.haml b/app/views/projects/labels/index.html.haml
index 80e4dce1a80..9c78bade254 100644
--- a/app/views/projects/labels/index.html.haml
+++ b/app/views/projects/labels/index.html.haml
@@ -4,6 +4,7 @@
 - can_admin_label = can?(current_user, :admin_label, @project)
 
 - if @labels.exists? || @prioritized_labels.exists?
+  #promote-label-modal
   %div{ class: container_class }
     .top-area.adjust
       .nav-text
diff --git a/app/views/projects/milestones/index.html.haml b/app/views/projects/milestones/index.html.haml
index 6a7bc4b1888..5b0197ed58c 100644
--- a/app/views/projects/milestones/index.html.haml
+++ b/app/views/projects/milestones/index.html.haml
@@ -13,6 +13,7 @@
 
   .milestones
     #delete-milestone-modal
+    #promote-milestone-modal
 
     %ul.content-list
       = render @milestones
diff --git a/app/views/projects/milestones/show.html.haml b/app/views/projects/milestones/show.html.haml
index de381d489c6..b423888c875 100644
--- a/app/views/projects/milestones/show.html.haml
+++ b/app/views/projects/milestones/show.html.haml
@@ -27,8 +27,15 @@
           Edit
 
         - if @project.group
-          = link_to promote_project_milestone_path(@milestone.project, @milestone), title: "Promote to Group Milestone", class: 'btn btn-grouped', data: { confirm: "Promoting #{@milestone.title} will make it available for all projects inside #{@project.group.name}. Existing project milestones with the same name will be merged. This action cannot be reversed.", toggle: "tooltip" }, method: :post do
-            Promote
+          %button.js-promote-project-milestone-button.btn.btn-grouped{ data: { toggle: 'modal',
+            target: '#promote-milestone-modal',
+            milestone_title: @milestone.title,
+            url: promote_project_milestone_path(@milestone.project, @milestone),
+            container: 'body' },
+            disabled: true,
+            type: 'button' }
+            = _('Promote')
+          #promote-milestone-modal
 
         - if @milestone.active?
           = link_to 'Close milestone', project_milestone_path(@project, @milestone, milestone: {state_event: :close }), method: :put, class: "btn btn-close btn-nr btn-grouped"
diff --git a/app/views/shared/_label.html.haml b/app/views/shared/_label.html.haml
index 8847d11f623..5afbc78df53 100644
--- a/app/views/shared/_label.html.haml
+++ b/app/views/shared/_label.html.haml
@@ -48,8 +48,16 @@
 
   .pull-right.hidden-xs.hidden-sm
     - if label.is_a?(ProjectLabel) && label.project.group && can?(current_user, :admin_label, label.project.group)
-      = link_to promote_project_label_path(label.project, label), title: "Promote to Group Label", class: 'btn btn-transparent btn-action', data: {confirm: "Promoting #{label.title} will make it available for all projects inside #{label.project.group.name}. Existing project labels with the same name will be merged. This action cannot be reversed.", toggle: "tooltip"}, method: :post do
-        %span.sr-only Promote to Group
+      %button.js-promote-project-label-button.btn.btn-transparent.btn-action.has-tooltip{ title: _('Promote to Group Label'),
+        disabled: true,
+        type: 'button',
+        data: { url: promote_project_label_path(label.project, label),
+                label_title: label.title,
+                label_color: label.color,
+                label_text_color: label.text_color,
+                target: '#promote-label-modal',
+                container: 'body',
+                toggle: 'modal' } }
         = sprite_icon('level-up')
     - if can?(current_user, :admin_label, label)
       = link_to edit_label_path(label), title: "Edit", class: 'btn btn-transparent btn-action', data: {toggle: "tooltip"} do
diff --git a/app/views/shared/_new_commit_form.html.haml b/app/views/shared/_new_commit_form.html.haml
index 0a4a24ae807..9221fd1e025 100644
--- a/app/views/shared/_new_commit_form.html.haml
+++ b/app/views/shared/_new_commit_form.html.haml
@@ -1,3 +1,6 @@
+- project = @project.present(current_user: current_user)
+- branch_name = selected_branch
+
 = render 'shared/commit_message_container', placeholder: placeholder
 
 - if @project.empty_repo?
@@ -7,12 +10,14 @@
     .form-group.branch
       = label_tag 'branch_name', _('Target Branch'), class: 'control-label'
       .col-sm-10
-        = text_field_tag 'branch_name', @branch_name || tree_edit_branch, required: true, class: "form-control js-branch-name ref-name"
+        = text_field_tag 'branch_name', branch_name, required: true, class: "form-control js-branch-name ref-name"
 
         .js-create-merge-request-container
           = render 'shared/new_merge_request_checkbox'
+  - elsif project.can_current_user_push_to_branch?(branch_name)
+    = hidden_field_tag 'branch_name', branch_name
   - else
-    = hidden_field_tag 'branch_name', @branch_name || tree_edit_branch
+    = hidden_field_tag 'branch_name', branch_name
     = hidden_field_tag 'create_merge_request', 1
 
   = hidden_field_tag 'original_branch', @ref, class: 'js-original-branch'
diff --git a/app/views/shared/issuable/_form.html.haml b/app/views/shared/issuable/_form.html.haml
index 6dfabd7ba4c..4c8f03f1498 100644
--- a/app/views/shared/issuable/_form.html.haml
+++ b/app/views/shared/issuable/_form.html.haml
@@ -33,6 +33,8 @@
 
 = render 'shared/issuable/form/merge_params', issuable: issuable
 
+= render 'shared/issuable/form/contribution', issuable: issuable, form: form
+
 - if @merge_request_to_resolve_discussions_of
   .form-group
     .col-sm-10.col-sm-offset-2
diff --git a/app/views/shared/issuable/form/_contribution.html.haml b/app/views/shared/issuable/form/_contribution.html.haml
new file mode 100644
index 00000000000..0f2d313a5cc
--- /dev/null
+++ b/app/views/shared/issuable/form/_contribution.html.haml
@@ -0,0 +1,20 @@
+- issuable = local_assigns.fetch(:issuable)
+- form = local_assigns.fetch(:form)
+
+- return unless issuable.is_a?(MergeRequest)
+- return unless issuable.for_fork?
+- return unless can?(current_user, :push_code, issuable.source_project)
+
+%hr
+
+.form-group
+  .control-label
+    = _('Contribution')
+  .col-sm-10
+    .checkbox
+      = form.label :allow_maintainer_to_push do
+        = form.check_box :allow_maintainer_to_push, disabled: !issuable.can_allow_maintainer_to_push?(current_user)
+        = _('Allow edits from maintainers')
+        = link_to 'About this feature', help_page_path('user/project/merge_requests/maintainer_access')
+        .help-block
+          = allow_maintainer_push_unavailable_reason(issuable)
diff --git a/app/views/shared/milestones/_milestone.html.haml b/app/views/shared/milestones/_milestone.html.haml
index da01fc02d07..9db2a321526 100644
--- a/app/views/shared/milestones/_milestone.html.haml
+++ b/app/views/shared/milestones/_milestone.html.haml
@@ -51,8 +51,15 @@
           \
 
           - if @project.group
-            = link_to promote_project_milestone_path(milestone.project, milestone), title: "Promote to Group Milestone", class: 'btn btn-xs btn-grouped', data: { confirm: "Promoting #{milestone.title} will make it available for all projects inside #{@project.group.name}. Existing project milestones with the same name will be merged. This action cannot be reversed.", toggle: "tooltip" }, method: :post do
-              Promote
+            %button.js-promote-project-milestone-button.btn.btn-xs.btn-grouped.has-tooltip{ title: _('Promote to Group Milestone'),
+              disabled: true,
+              type: 'button',
+              data: { url: promote_project_milestone_path(milestone.project, milestone),
+                      milestone_title: milestone.title,
+                      target: '#promote-milestone-modal',
+                      container: 'body',
+                      toggle: 'modal' } }
+              = _('Promote')
 
           = link_to 'Close Milestone', project_milestone_path(@project, milestone, milestone: {state_event: :close }), method: :put, remote: true, class: "btn btn-xs btn-close btn-grouped"
 
diff --git a/app/views/shared/projects/_edit_information.html.haml b/app/views/shared/projects/_edit_information.html.haml
new file mode 100644
index 00000000000..ec9dc8f62c2
--- /dev/null
+++ b/app/views/shared/projects/_edit_information.html.haml
@@ -0,0 +1,6 @@
+- unless can?(current_user, :push_code, @project)
+  .inline.prepend-left-10
+    - if @project.branch_allows_maintainer_push?(current_user, selected_branch)
+      = commit_in_single_accessible_branch
+    - else
+      = commit_in_fork_help
diff --git a/app/workers/emails_on_push_worker.rb b/app/workers/emails_on_push_worker.rb
index 21da27973fe..2a4d65b5cb3 100644
--- a/app/workers/emails_on_push_worker.rb
+++ b/app/workers/emails_on_push_worker.rb
@@ -66,7 +66,7 @@ class EmailsOnPushWorker
 
       # These are input errors and won't be corrected even if Sidekiq retries
       rescue Net::SMTPFatalError, Net::SMTPSyntaxError => e
-        logger.info("Failed to send e-mail for project '#{project.name_with_namespace}' to #{recipient}: #{e}")
+        logger.info("Failed to send e-mail for project '#{project.full_name}' to #{recipient}: #{e}")
       end
     end
   ensure
diff --git a/changelogs/unreleased/39444-make-margin-around-dropdown-dividers-4px.yml b/changelogs/unreleased/39444-make-margin-around-dropdown-dividers-4px.yml
new file mode 100644
index 00000000000..da65cfff799
--- /dev/null
+++ b/changelogs/unreleased/39444-make-margin-around-dropdown-dividers-4px.yml
@@ -0,0 +1,5 @@
+---
+title: Set margins around dropdown dividers to 4px
+merge_request: 17517
+author:
+type: fixed
diff --git a/changelogs/unreleased/bvl-allow-maintainer-to-push.yml b/changelogs/unreleased/bvl-allow-maintainer-to-push.yml
new file mode 100644
index 00000000000..a3fefc2889a
--- /dev/null
+++ b/changelogs/unreleased/bvl-allow-maintainer-to-push.yml
@@ -0,0 +1,5 @@
+---
+title: Allow maintainers to push to forks of their projects when a merge request is open
+merge_request: 17395
+author:
+type: added
diff --git a/changelogs/unreleased/jivl-new-modal-project-labels-milestones.yml b/changelogs/unreleased/jivl-new-modal-project-labels-milestones.yml
new file mode 100644
index 00000000000..6b7e14c6cfc
--- /dev/null
+++ b/changelogs/unreleased/jivl-new-modal-project-labels-milestones.yml
@@ -0,0 +1,5 @@
+---
+title: Added new design for promotion modals
+merge_request: 17197
+author:
+type: other
diff --git a/changelogs/unreleased/upgrade-workhorse-4-0-0.yml b/changelogs/unreleased/upgrade-workhorse-4-0-0.yml
new file mode 100644
index 00000000000..f9dbdc7fc56
--- /dev/null
+++ b/changelogs/unreleased/upgrade-workhorse-4-0-0.yml
@@ -0,0 +1,5 @@
+---
+title: Upgrade GitLab Workhorse to 4.0.0
+merge_request:
+author:
+type: added
diff --git a/db/migrate/20180221151752_add_allow_maintainer_to_push_to_merge_requests.rb b/db/migrate/20180221151752_add_allow_maintainer_to_push_to_merge_requests.rb
new file mode 100644
index 00000000000..81acfbc3655
--- /dev/null
+++ b/db/migrate/20180221151752_add_allow_maintainer_to_push_to_merge_requests.rb
@@ -0,0 +1,18 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddAllowMaintainerToPushToMergeRequests < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_column :merge_requests, :allow_maintainer_to_push, :boolean
+  end
+
+  def down
+    remove_column :merge_requests, :allow_maintainer_to_push
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 387b15f8f30..b93e6fa594b 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -1145,6 +1145,7 @@ ActiveRecord::Schema.define(version: 20180307012445) do
     t.boolean "discussion_locked"
     t.integer "latest_merge_request_diff_id"
     t.string "rebase_commit_sha"
+    t.boolean "allow_maintainer_to_push"
   end
 
   add_index "merge_requests", ["assignee_id"], name: "index_merge_requests_on_assignee_id", using: :btree
diff --git a/doc/api/README.md b/doc/api/README.md
index f40fd587c0a..ae4481b400e 100644
--- a/doc/api/README.md
+++ b/doc/api/README.md
@@ -37,7 +37,7 @@ following locations:
 - [Group milestones](group_milestones.md)
 - [Namespaces](namespaces.md)
 - [Notes](notes.md) (comments)
-- [Threaded comments](discussions.md)
+- [Discussions](discussions.md) (threaded comments)
 - [Notification settings](notification_settings.md)
 - [Open source license templates](templates/licenses.md)
 - [Pages Domains](pages_domains.md)
diff --git a/doc/api/discussions.md b/doc/api/discussions.md
index 07837d7d4c3..c341b7f2009 100644
--- a/doc/api/discussions.md
+++ b/doc/api/discussions.md
@@ -1,6 +1,6 @@
 # Discussions API
 
-Discussions are set of related notes on snippets, issues or epics.
+Discussions are set of related notes on snippets or issues.
 
 ## Issues
 
diff --git a/doc/api/merge_requests.md b/doc/api/merge_requests.md
index 25b0807eb18..b9a4f661777 100644
--- a/doc/api/merge_requests.md
+++ b/doc/api/merge_requests.md
@@ -529,18 +529,19 @@ Creates a new merge request.
 POST /projects/:id/merge_requests
 ```
 
-| Attribute              | Type    | Required | Description                                                                     |
-| ---------              | ----    | -------- | -----------                                                                     |
-| `id`                   | integer/string  | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
-| `source_branch`        | string  | yes      | The source branch                                                               |
-| `target_branch`        | string  | yes      | The target branch                                                               |
-| `title`                | string  | yes      | Title of MR                                                                     |
-| `assignee_id`          | integer | no       | Assignee user ID                                                                |
-| `description`          | string  | no       | Description of MR                                                               |
-| `target_project_id`    | integer | no       | The target project (numeric id)                                                 |
-| `labels`               | string  | no       | Labels for MR as a comma-separated list                                         |
-| `milestone_id`         | integer | no       | The ID of a milestone                                                           |
-| `remove_source_branch` | boolean | no       | Flag indicating if a merge request should remove the source branch when merging |
+| Attribute                  | Type    | Required | Description                                                                     |
+| ---------                  | ----    | -------- | -----------                                                                     |
+| `id`                       | integer/string  | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
+| `source_branch`            | string  | yes      | The source branch                                                               |
+| `target_branch`            | string  | yes      | The target branch                                                               |
+| `title`                    | string  | yes      | Title of MR                                                                     |
+| `assignee_id`              | integer | no       | Assignee user ID                                                                |
+| `description`              | string  | no       | Description of MR                                                               |
+| `target_project_id`        | integer | no       | The target project (numeric id)                                                 |
+| `labels`                   | string  | no       | Labels for MR as a comma-separated list                                         |
+| `milestone_id`             | integer | no       | The ID of a milestone                                                           |
+| `remove_source_branch`     | boolean | no       | Flag indicating if a merge request should remove the source branch when merging |
+| `allow_maintainer_to_push` | boolean | no       | Whether or not a maintainer of the target project can push to the source branch  |
 
 ```json
 {
@@ -548,7 +549,7 @@ POST /projects/:id/merge_requests
   "iid": 1,
   "target_branch": "master",
   "source_branch": "test1",
-  "project_id": 3,
+  "project_id": 4,
   "title": "test1",
   "state": "opened",
   "upvotes": 0,
@@ -569,7 +570,7 @@ POST /projects/:id/merge_requests
     "state": "active",
     "created_at": "2012-04-29T08:46:00Z"
   },
-  "source_project_id": 4,
+  "source_project_id": 3,
   "target_project_id": 4,
   "labels": [ ],
   "description": "fixed login page css paddings",
@@ -596,6 +597,7 @@ POST /projects/:id/merge_requests
   "force_remove_source_branch": false,
   "web_url": "http://example.com/example/example/merge_requests/1",
   "discussion_locked": false,
+  "allow_maintainer_to_push": false,
   "time_stats": {
     "time_estimate": 0,
     "total_time_spent": 0,
@@ -613,19 +615,20 @@ Updates an existing merge request. You can change the target branch, title, or e
 PUT /projects/:id/merge_requests/:merge_request_iid
 ```
 
-| Attribute              | Type    | Required | Description                                                                     |
-| ---------              | ----    | -------- | -----------                                                                     |
-| `id`                   | integer/string | yes  | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
-| `merge_request_iid`    | integer | yes      | The ID of a merge request                                                       |
-| `target_branch`        | string  | no       | The target branch                                                               |
-| `title`                | string  | no       | Title of MR                                                                     |
-| `assignee_id`          | integer | no       | The ID of the user to assign the merge request to. Set to `0` or provide an empty value to unassign all assignees.  |
-| `milestone_id`         | integer | no       | The ID of a milestone to assign the merge request to. Set to `0` or provide an empty value to unassign a milestone.|
-| `labels`               | string  | no       | Comma-separated label names for a merge request. Set to an empty string to unassign all labels.                    |
-| `description`          | string  | no       | Description of MR                                                               |
-| `state_event`          | string  | no       | New state (close/reopen)                                                        |
-| `remove_source_branch` | boolean | no       | Flag indicating if a merge request should remove the source branch when merging |
-| `discussion_locked`    | boolean | no       | Flag indicating if the merge request's discussion is locked. If the discussion is locked only project members can add, edit or resolve comments. |
+| Attribute                  | Type    | Required | Description                                                                     |
+| ---------                  | ----    | -------- | -----------                                                                     |
+| `id`                       | integer/string | yes  | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
+| `merge_request_iid`        | integer | yes      | The ID of a merge request                                                       |
+| `target_branch`            | string  | no       | The target branch                                                               |
+| `title`                    | string  | no       | Title of MR                                                                     |
+| `assignee_id`              | integer | no       | The ID of the user to assign the merge request to. Set to `0` or provide an empty value to unassign all assignees.  |
+| `milestone_id`             | integer | no       | The ID of a milestone to assign the merge request to. Set to `0` or provide an empty value to unassign a milestone.|
+| `labels`                   | string  | no       | Comma-separated label names for a merge request. Set to an empty string to unassign all labels.                    |
+| `description`              | string  | no       | Description of MR                                                               |
+| `state_event`              | string  | no       | New state (close/reopen)                                                        |
+| `remove_source_branch`     | boolean | no       | Flag indicating if a merge request should remove the source branch when merging |
+| `discussion_locked`        | boolean | no       | Flag indicating if the merge request's discussion is locked. If the discussion is locked only project members can add, edit or resolve comments. |
+| `allow_maintainer_to_push` | boolean | no       | Whether or not a maintainer of the target project can push to the source branch |
 
 Must include at least one non-required attribute from above.
 
@@ -634,7 +637,7 @@ Must include at least one non-required attribute from above.
   "id": 1,
   "iid": 1,
   "target_branch": "master",
-  "project_id": 3,
+  "project_id": 4,
   "title": "test1",
   "state": "opened",
   "upvotes": 0,
@@ -655,7 +658,7 @@ Must include at least one non-required attribute from above.
     "state": "active",
     "created_at": "2012-04-29T08:46:00Z"
   },
-  "source_project_id": 4,
+  "source_project_id": 3,
   "target_project_id": 4,
   "labels": [ ],
   "description": "description1",
@@ -682,6 +685,7 @@ Must include at least one non-required attribute from above.
   "force_remove_source_branch": false,
   "web_url": "http://example.com/example/example/merge_requests/1",
   "discussion_locked": false,
+  "allow_maintainer_to_push": false,
   "time_stats": {
     "time_estimate": 0,
     "total_time_spent": 0,
diff --git a/doc/development/new_fe_guide/dependencies.md b/doc/development/new_fe_guide/dependencies.md
new file mode 100644
index 00000000000..3417d77a06d
--- /dev/null
+++ b/doc/development/new_fe_guide/dependencies.md
@@ -0,0 +1,3 @@
+# Dependencies
+
+> TODO: Add Dependencies
\ No newline at end of file
diff --git a/doc/development/new_fe_guide/development/accessibility.md b/doc/development/new_fe_guide/development/accessibility.md
new file mode 100644
index 00000000000..ed35f08432f
--- /dev/null
+++ b/doc/development/new_fe_guide/development/accessibility.md
@@ -0,0 +1,3 @@
+# Accessibility
+
+> TODO: Add content
diff --git a/doc/development/new_fe_guide/development/components.md b/doc/development/new_fe_guide/development/components.md
new file mode 100644
index 00000000000..637099d1e83
--- /dev/null
+++ b/doc/development/new_fe_guide/development/components.md
@@ -0,0 +1,3 @@
+# Components
+
+> TODO: Add content
diff --git a/doc/development/new_fe_guide/development/design_patterns.md b/doc/development/new_fe_guide/development/design_patterns.md
new file mode 100644
index 00000000000..ee06566ed30
--- /dev/null
+++ b/doc/development/new_fe_guide/development/design_patterns.md
@@ -0,0 +1,3 @@
+# Design patterns
+
+> TODO: Add content
diff --git a/doc/development/new_fe_guide/development/index.md b/doc/development/new_fe_guide/development/index.md
new file mode 100644
index 00000000000..f8d64d9ff45
--- /dev/null
+++ b/doc/development/new_fe_guide/development/index.md
@@ -0,0 +1,29 @@
+# Development
+
+## [Design patterns](design_patterns.md)
+
+Examples of proven design patterns used in our codebase.
+
+## [Components](components.md)
+
+Documentation on existing components and how to best create a new component.
+
+## [Accessiblity](accessibility.md)
+
+Learn how to implement an accessible frontend.
+
+## [Network requests](network_requests.md)
+
+Learn how to handle network requests in our codebase.
+
+## [Security](security.md)
+
+Learn how to ensure that our frontend is secure.
+
+## [Performance](performance.md)
+
+Learn how to keep our frontend performant.
+
+## [Testing](testing.md)
+
+Learn how to keep our frontend tested.
diff --git a/doc/development/new_fe_guide/development/network_requests.md b/doc/development/new_fe_guide/development/network_requests.md
new file mode 100644
index 00000000000..047c00313bc
--- /dev/null
+++ b/doc/development/new_fe_guide/development/network_requests.md
@@ -0,0 +1,3 @@
+# Network requests
+
+> TODO: Add content
diff --git a/doc/development/new_fe_guide/development/performance.md b/doc/development/new_fe_guide/development/performance.md
new file mode 100644
index 00000000000..26b07874f0f
--- /dev/null
+++ b/doc/development/new_fe_guide/development/performance.md
@@ -0,0 +1,3 @@
+# Performance
+
+> TODO: Add content
diff --git a/doc/development/new_fe_guide/development/security.md b/doc/development/new_fe_guide/development/security.md
new file mode 100644
index 00000000000..debda7de0c6
--- /dev/null
+++ b/doc/development/new_fe_guide/development/security.md
@@ -0,0 +1,3 @@
+# Security
+
+> TODO: Add content
diff --git a/doc/development/new_fe_guide/development/testing.md b/doc/development/new_fe_guide/development/testing.md
new file mode 100644
index 00000000000..c359bd83ed1
--- /dev/null
+++ b/doc/development/new_fe_guide/development/testing.md
@@ -0,0 +1,3 @@
+# Testing
+
+> TODO: Add content
diff --git a/doc/development/new_fe_guide/index.md b/doc/development/new_fe_guide/index.md
new file mode 100644
index 00000000000..08c6a266e7f
--- /dev/null
+++ b/doc/development/new_fe_guide/index.md
@@ -0,0 +1,28 @@
+# Frontend Development Guidelines
+
+This guide contains all the information to successfully contribute to GitLab's frontend.
+This is a living document, and we welcome contributions, feedback and suggestions.
+
+## [Principles](principles.md)
+
+Ensure that your frontend contribution starts off in the right direction.
+
+## [Initiatives](initiatives.md)
+
+High level overview of where we are going from a frontend perspective.
+
+## [Development](development/index.md)
+
+Guidance on topics related to development.
+
+## [Dependencies](dependencies.md)
+
+Learn about all the dependencies that make up our frontend, including some of our own custom built libraries.
+
+## [Style](style/index.md)
+
+Style guides to keep our code consistent.
+
+## [Tips](tips.md)
+
+Tips from our frontend team to develop more efficiently and effectively.
diff --git a/doc/development/new_fe_guide/initiatives.md b/doc/development/new_fe_guide/initiatives.md
new file mode 100644
index 00000000000..c81ed3579f0
--- /dev/null
+++ b/doc/development/new_fe_guide/initiatives.md
@@ -0,0 +1,3 @@
+# Initiatives
+
+> TODO: Add Initiatives
diff --git a/doc/development/new_fe_guide/principles.md b/doc/development/new_fe_guide/principles.md
new file mode 100644
index 00000000000..2126d202a7e
--- /dev/null
+++ b/doc/development/new_fe_guide/principles.md
@@ -0,0 +1,3 @@
+# Principles
+
+> TODO: Add principles
diff --git a/doc/development/new_fe_guide/style/html.md b/doc/development/new_fe_guide/style/html.md
new file mode 100644
index 00000000000..5489def5d6e
--- /dev/null
+++ b/doc/development/new_fe_guide/style/html.md
@@ -0,0 +1,3 @@
+# HTML style guide
+
+> TODO: Add content
diff --git a/doc/development/new_fe_guide/style/index.md b/doc/development/new_fe_guide/style/index.md
new file mode 100644
index 00000000000..d2d576b3b46
--- /dev/null
+++ b/doc/development/new_fe_guide/style/index.md
@@ -0,0 +1,9 @@
+# Style
+
+## [HTML style guide](html.md)
+
+## [SCSS style guide](scss.md)
+
+## [JavaScript style guide](javascript.md)
+
+## [Vue style guide](vue.md)
diff --git a/doc/development/new_fe_guide/style/javascript.md b/doc/development/new_fe_guide/style/javascript.md
new file mode 100644
index 00000000000..480d50a211f
--- /dev/null
+++ b/doc/development/new_fe_guide/style/javascript.md
@@ -0,0 +1,3 @@
+# JavaScript style guide
+
+> TODO: Add content
diff --git a/doc/development/new_fe_guide/style/scss.md b/doc/development/new_fe_guide/style/scss.md
new file mode 100644
index 00000000000..6f5e818d7db
--- /dev/null
+++ b/doc/development/new_fe_guide/style/scss.md
@@ -0,0 +1,3 @@
+# SCSS style guide
+
+> TODO: Add content
diff --git a/doc/development/new_fe_guide/style/vue.md b/doc/development/new_fe_guide/style/vue.md
new file mode 100644
index 00000000000..fd9353e0d3f
--- /dev/null
+++ b/doc/development/new_fe_guide/style/vue.md
@@ -0,0 +1,3 @@
+# Vue style guide
+
+> TODO: Add content
diff --git a/doc/development/new_fe_guide/tips.md b/doc/development/new_fe_guide/tips.md
new file mode 100644
index 00000000000..f0cdf52d618
--- /dev/null
+++ b/doc/development/new_fe_guide/tips.md
@@ -0,0 +1,3 @@
+# Tips
+
+> TODO: Add tips
diff --git a/doc/user/project/merge_requests/img/allow_maintainer_push.png b/doc/user/project/merge_requests/img/allow_maintainer_push.png
new file mode 100644
index 00000000000..e73cc1ab5a5
--- /dev/null
+++ b/doc/user/project/merge_requests/img/allow_maintainer_push.png
diff --git a/doc/user/project/merge_requests/index.md b/doc/user/project/merge_requests/index.md
index d3220598933..10d67729734 100644
--- a/doc/user/project/merge_requests/index.md
+++ b/doc/user/project/merge_requests/index.md
@@ -28,6 +28,7 @@ With GitLab merge requests, you can:
 - Enable [fast-forward merge requests](#fast-forward-merge-requests)
 - Enable [semi-linear history merge requests](#semi-linear-history-merge-requests) as another security layer to guarantee the pipeline is passing in the target branch
 - [Create new merge requests by email](#create-new-merge-requests-by-email)
+- Allow maintainers of the target project to push directly to the fork by [allowing edits from maintainers](maintainer_access.md)
 
 With **[GitLab Enterprise Edition][ee]**, you can also:
 
diff --git a/doc/user/project/merge_requests/maintainer_access.md b/doc/user/project/merge_requests/maintainer_access.md
new file mode 100644
index 00000000000..1ade5db1587
--- /dev/null
+++ b/doc/user/project/merge_requests/maintainer_access.md
@@ -0,0 +1,13 @@
+# Allow maintainer pushes for merge requests accross forks
+
+This feature is available for merge requests across forked projects that are
+publicly accessible. It makes it easier for maintainers of projects to collaborate
+on merge requests across forks.
+
+When enabling this feature for a merge request, you give can give members with push access to the target project rights to edit files on the source branch of the merge request.
+
+The feature can only be enabled by users who already have push access to the source project. And only lasts while the merge request is open.
+
+Enable this functionality while creating a merge request:
+
+![Enable maintainer edits](./img/allow_maintainer_push.png)
diff --git a/features/steps/shared/project.rb b/features/steps/shared/project.rb
index affbccccdf9..07a0e2e072c 100644
--- a/features/steps/shared/project.rb
+++ b/features/steps/shared/project.rb
@@ -82,7 +82,7 @@ module SharedProject
 
   step 'I should see project "Shop" activity feed' do
     project = Project.find_by(name: "Shop")
-    expect(page).to have_content "#{@user.name} pushed new branch fix at #{project.name_with_namespace}"
+    expect(page).to have_content "#{@user.name} pushed new branch fix at #{project.full_name}"
   end
 
   step 'I should see project settings' do
@@ -113,12 +113,12 @@ module SharedProject
 
   step 'I should not see project "Archive"' do
     project = Project.find_by(name: "Archive")
-    expect(page).not_to have_content project.name_with_namespace
+    expect(page).not_to have_content project.full_name
   end
 
   step 'I should see project "Archive"' do
     project = Project.find_by(name: "Archive")
-    expect(page).to have_content project.name_with_namespace
+    expect(page).to have_content project.full_name
   end
 
   # ----------------------------------------
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index 4555184095c..16147ee90c9 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -547,6 +547,7 @@ module API
       expose :discussion_locked
       expose :should_remove_source_branch?, as: :should_remove_source_branch
       expose :force_remove_source_branch?, as: :force_remove_source_branch
+      expose :allow_maintainer_to_push, if: -> (merge_request, _) { merge_request.for_fork? }
 
       expose :web_url do |merge_request, options|
         Gitlab::UrlBuilder.build(merge_request)
diff --git a/lib/api/helpers/internal_helpers.rb b/lib/api/helpers/internal_helpers.rb
index cd59da6fc70..4b564cfdef2 100644
--- a/lib/api/helpers/internal_helpers.rb
+++ b/lib/api/helpers/internal_helpers.rb
@@ -111,13 +111,6 @@ module API
       def gitaly_payload(action)
         return unless %w[git-receive-pack git-upload-pack].include?(action)
 
-        if action == 'git-receive-pack'
-          return unless Gitlab::GitalyClient.feature_enabled?(
-            :ssh_receive_pack,
-            status: Gitlab::GitalyClient::MigrationStatus::OPT_OUT
-          )
-        end
-
         {
           repository: repository.gitaly_repository,
           address: Gitlab::GitalyClient.address(project.repository_storage),
diff --git a/lib/api/merge_requests.rb b/lib/api/merge_requests.rb
index ead1bb7957b..3264a26f7d2 100644
--- a/lib/api/merge_requests.rb
+++ b/lib/api/merge_requests.rb
@@ -144,6 +144,7 @@ module API
           optional :milestone_id, type: Integer, desc: 'The ID of a milestone to assign the merge request'
           optional :labels, type: String, desc: 'Comma-separated list of label names'
           optional :remove_source_branch, type: Boolean, desc: 'Remove source branch when merging'
+          optional :allow_maintainer_to_push, type: Boolean, desc: 'Whether a maintainer of the target project can push to the source project'
 
           use :optional_params_ee
         end
diff --git a/lib/gitlab/bitbucket_import/importer.rb b/lib/gitlab/bitbucket_import/importer.rb
index d48ae17aeaf..bffbcb86137 100644
--- a/lib/gitlab/bitbucket_import/importer.rb
+++ b/lib/gitlab/bitbucket_import/importer.rb
@@ -135,7 +135,7 @@ module Gitlab
           if label.valid?
             @labels[label_params[:title]] = label
           else
-            raise "Failed to create label \"#{label_params[:title]}\" for project \"#{project.name_with_namespace}\""
+            raise "Failed to create label \"#{label_params[:title]}\" for project \"#{project.full_name}\""
           end
         end
       end
diff --git a/lib/gitlab/checks/change_access.rb b/lib/gitlab/checks/change_access.rb
index 3ce5f807989..51ba09aa129 100644
--- a/lib/gitlab/checks/change_access.rb
+++ b/lib/gitlab/checks/change_access.rb
@@ -47,7 +47,7 @@ module Gitlab
       protected
 
       def push_checks
-        if user_access.cannot_do_action?(:push_code)
+        unless can_push?
           raise GitAccess::UnauthorizedError, ERROR_MESSAGES[:push_code]
         end
       end
@@ -183,6 +183,11 @@ module Gitlab
       def commits
         @commits ||= project.repository.new_commits(newrev)
       end
+
+      def can_push?
+        user_access.can_do_action?(:push_code) ||
+          user_access.can_push_to_branch?(branch_name)
+      end
     end
   end
 end
diff --git a/lib/gitlab/data_builder/build.rb b/lib/gitlab/data_builder/build.rb
index 8e74e18a311..2f1445a050a 100644
--- a/lib/gitlab/data_builder/build.rb
+++ b/lib/gitlab/data_builder/build.rb
@@ -31,7 +31,7 @@ module Gitlab
 
           # TODO: do we still need it?
           project_id: project.id,
-          project_name: project.name_with_namespace,
+          project_name: project.full_name,
 
           user: {
             id: user.try(:id),
diff --git a/lib/gitlab/git/repository.rb b/lib/gitlab/git/repository.rb
index 1445b7924dc..d4f6b543daf 100644
--- a/lib/gitlab/git/repository.rb
+++ b/lib/gitlab/git/repository.rb
@@ -1443,12 +1443,12 @@ module Gitlab
         end
       end
 
-      def last_commit_id_for_path(sha, path)
+      def last_commit_for_path(sha, path)
         gitaly_migrate(:last_commit_for_path) do |is_enabled|
           if is_enabled
-            last_commit_for_path_by_gitaly(sha, path).id
+            last_commit_for_path_by_gitaly(sha, path)
           else
-            last_commit_id_for_path_by_shelling_out(sha, path)
+            last_commit_for_path_by_rugged(sha, path)
           end
         end
       end
@@ -1896,7 +1896,7 @@ module Gitlab
       end
 
       def last_commit_for_path_by_rugged(sha, path)
-        sha = last_commit_id_for_path(sha, path)
+        sha = last_commit_id_for_path_by_shelling_out(sha, path)
         commit(sha)
       end
 
diff --git a/lib/gitlab/slash_commands/presenters/issue_new.rb b/lib/gitlab/slash_commands/presenters/issue_new.rb
index 86490a39cc1..5964bfe9960 100644
--- a/lib/gitlab/slash_commands/presenters/issue_new.rb
+++ b/lib/gitlab/slash_commands/presenters/issue_new.rb
@@ -38,7 +38,7 @@ module Gitlab
         end
 
         def project_link
-          "[#{project.name_with_namespace}](#{project.web_url})"
+          "[#{project.full_name}](#{project.web_url})"
         end
 
         def author_profile_link
diff --git a/lib/gitlab/slash_commands/presenters/issue_show.rb b/lib/gitlab/slash_commands/presenters/issue_show.rb
index c99316df667..562f15f403c 100644
--- a/lib/gitlab/slash_commands/presenters/issue_show.rb
+++ b/lib/gitlab/slash_commands/presenters/issue_show.rb
@@ -53,7 +53,7 @@ module Gitlab
         end
 
         def pretext
-          "Issue *#{@resource.to_reference}* from #{project.name_with_namespace}"
+          "Issue *#{@resource.to_reference}* from #{project.full_name}"
         end
       end
     end
diff --git a/lib/gitlab/user_access.rb b/lib/gitlab/user_access.rb
index 91b8bb2a83f..fd68b9f2b48 100644
--- a/lib/gitlab/user_access.rb
+++ b/lib/gitlab/user_access.rb
@@ -68,8 +68,10 @@ module Gitlab
         return true if project.user_can_push_to_empty_repo?(user)
 
         protected_branch_accessible_to?(ref, action: :push)
+      elsif user.can?(:push_code, project)
+        true
       else
-        user.can?(:push_code, project)
+        project.branch_allows_maintainer_push?(user, ref)
       end
     end
 
diff --git a/lib/gitlab/workhorse.rb b/lib/gitlab/workhorse.rb
index 823df67ea39..0b0d667d4fd 100644
--- a/lib/gitlab/workhorse.rb
+++ b/lib/gitlab/workhorse.rb
@@ -10,6 +10,7 @@ module Gitlab
     INTERNAL_API_CONTENT_TYPE = 'application/vnd.gitlab-workhorse+json'.freeze
     INTERNAL_API_REQUEST_HEADER = 'Gitlab-Workhorse-Api-Request'.freeze
     NOTIFICATION_CHANNEL = 'workhorse:notifications'.freeze
+    ALLOWED_GIT_HTTP_ACTIONS = %w[git_receive_pack git_upload_pack info_refs].freeze
 
     # Supposedly the effective key size for HMAC-SHA256 is 256 bits, i.e. 32
     # bytes https://tools.ietf.org/html/rfc4868#section-2.6
@@ -17,6 +18,8 @@ module Gitlab
 
     class << self
       def git_http_ok(repository, is_wiki, user, action, show_all_refs: false)
+        raise "Unsupported action: #{action}" unless ALLOWED_GIT_HTTP_ACTIONS.include?(action.to_s)
+
         project = repository.project
         repo_path = repository.path_to_repo
         params = {
@@ -31,24 +34,7 @@ module Gitlab
           token: Gitlab::GitalyClient.token(project.repository_storage)
         }
         params[:Repository] = repository.gitaly_repository.to_h
-
-        feature_enabled = case action.to_s
-                          when 'git_receive_pack'
-                            Gitlab::GitalyClient.feature_enabled?(
-                              :post_receive_pack,
-                              status: Gitlab::GitalyClient::MigrationStatus::OPT_OUT
-                            )
-                          when 'git_upload_pack'
-                            true
-                          when 'info_refs'
-                            true
-                          else
-                            raise "Unsupported action: #{action}"
-                          end
-
-        if feature_enabled
-          params[:GitalyServer] = server
-        end
+        params[:GitalyServer] = server
 
         params
       end
diff --git a/lib/system_check/helpers.rb b/lib/system_check/helpers.rb
index 914ed794601..6227e461d24 100644
--- a/lib/system_check/helpers.rb
+++ b/lib/system_check/helpers.rb
@@ -50,7 +50,7 @@ module SystemCheck
       if should_sanitize?
         "#{project.namespace_id.to_s.color(:yellow)}/#{project.id.to_s.color(:yellow)} ... "
       else
-        "#{project.name_with_namespace.color(:yellow)} ... "
+        "#{project.full_name.color(:yellow)} ... "
       end
     end
 
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 9b414bfeff7..3f05e878cc8 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -8,8 +8,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: gitlab 1.0.0\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2018-03-05 17:10-0600\n"
-"PO-Revision-Date: 2018-03-05 17:10-0600\n"
+"POT-Creation-Date: 2018-03-06 17:36+0100\n"
+"PO-Revision-Date: 2018-03-06 17:36+0100\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
 "Language: \n"
@@ -105,6 +105,9 @@ msgstr ""
 msgid "A collection of graphs regarding Continuous Integration"
 msgstr ""
 
+msgid "A new branch will be created in your fork and a new merge request will be started."
+msgstr ""
+
 msgid "A project is where you house your files (repository), plan your work (issues), and publish your documentation (wiki), %{among_other_things_link}."
 msgstr ""
 
@@ -210,6 +213,9 @@ msgstr ""
 msgid "All features are enabled for blank projects, from templates, or when importing, but you can disable them afterward in the project settings."
 msgstr ""
 
+msgid "Allow edits from maintainers"
+msgstr ""
+
 msgid "Allows you to add and manage Kubernetes clusters."
 msgstr ""
 
@@ -410,6 +416,15 @@ msgstr ""
 msgid "Branches"
 msgstr ""
 
+msgid "Branches|Active"
+msgstr ""
+
+msgid "Branches|Active branches"
+msgstr ""
+
+msgid "Branches|All"
+msgstr ""
+
 msgid "Branches|Cant find HEAD commit for this branch"
 msgstr ""
 
@@ -455,12 +470,39 @@ msgstr ""
 msgid "Branches|Only a project master or owner can delete a protected branch"
 msgstr ""
 
-msgid "Branches|Protected branches can be managed in %{project_settings_link}"
+msgid "Branches|Overview"
+msgstr ""
+
+msgid "Branches|Protected branches can be managed in %{project_settings_link}."
+msgstr ""
+
+msgid "Branches|Show active branches"
+msgstr ""
+
+msgid "Branches|Show all branches"
+msgstr ""
+
+msgid "Branches|Show more active branches"
+msgstr ""
+
+msgid "Branches|Show more stale branches"
+msgstr ""
+
+msgid "Branches|Show overview of the branches"
+msgstr ""
+
+msgid "Branches|Show stale branches"
 msgstr ""
 
 msgid "Branches|Sort by"
 msgstr ""
 
+msgid "Branches|Stale"
+msgstr ""
+
+msgid "Branches|Stale branches"
+msgstr ""
+
 msgid "Branches|The default branch cannot be deleted"
 msgstr ""
 
@@ -1086,6 +1128,9 @@ msgstr ""
 msgid "ContainerRegistry|With the Docker Container Registry integrated into GitLab, every project can have its own space to store its Docker images."
 msgstr ""
 
+msgid "Contribution"
+msgstr ""
+
 msgid "Contribution guide"
 msgstr ""
 
@@ -1436,6 +1481,9 @@ msgstr ""
 msgid "Find file"
 msgstr ""
 
+msgid "Finished"
+msgstr ""
+
 msgid "FirstPushedBy|First"
 msgstr ""
 
@@ -1969,6 +2017,12 @@ msgstr ""
 msgid "Not available"
 msgstr ""
 
+msgid "Not available for private projects"
+msgstr ""
+
+msgid "Not available for protected branches"
+msgstr ""
+
 msgid "Not confidential"
 msgstr ""
 
@@ -2101,6 +2155,9 @@ msgstr ""
 msgid "Password"
 msgstr ""
 
+msgid "Pending"
+msgstr ""
+
 msgid "Personal Access Token"
 msgstr ""
 
@@ -2182,9 +2239,30 @@ msgstr ""
 msgid "Pipelines|Build with confidence"
 msgstr ""
 
+msgid "Pipelines|CI Lint"
+msgstr ""
+
+msgid "Pipelines|Clear Runner Caches"
+msgstr ""
+
 msgid "Pipelines|Get started with Pipelines"
 msgstr ""
 
+msgid "Pipelines|Loading Pipelines"
+msgstr ""
+
+msgid "Pipelines|Run Pipeline"
+msgstr ""
+
+msgid "Pipelines|There are currently no %{scope} pipelines."
+msgstr ""
+
+msgid "Pipelines|There are currently no pipelines."
+msgstr ""
+
+msgid "Pipelines|This project is not currently set up to run pipelines."
+msgstr ""
+
 msgid "Pipeline|Retry pipeline"
 msgstr ""
 
@@ -2437,6 +2515,9 @@ msgstr ""
 msgid "Public - The project can be accessed without any authentication."
 msgstr ""
 
+msgid "Push access to this project is necessary in order to enable this option"
+msgstr ""
+
 msgid "Push events"
 msgstr ""
 
@@ -2523,6 +2604,9 @@ msgstr ""
 msgid "Revert this merge request"
 msgstr ""
 
+msgid "Running"
+msgstr ""
+
 msgid "SSH Keys"
 msgstr ""
 
@@ -3518,6 +3602,9 @@ msgstr ""
 msgid "Your Kubernetes cluster information on this page is still editable, but you are advised to disable and reconfigure"
 msgstr ""
 
+msgid "Your changes can be committed to %{branch_name} because a merge request is open."
+msgstr ""
+
 msgid "Your comment will not be visible to the public."
 msgstr ""
 
@@ -3570,6 +3657,9 @@ msgstr[1] ""
 msgid "mrWidget| Please restore it or use a different %{missingBranchName} branch"
 msgstr ""
 
+msgid "mrWidget|Allows edits from maintainers"
+msgstr ""
+
 msgid "mrWidget|Cancel automatic merge"
 msgstr ""
 
diff --git a/spec/controllers/projects/milestones_controller_spec.rb b/spec/controllers/projects/milestones_controller_spec.rb
index 00cf464ec5b..306094f7ffb 100644
--- a/spec/controllers/projects/milestones_controller_spec.rb
+++ b/spec/controllers/projects/milestones_controller_spec.rb
@@ -98,10 +98,8 @@ describe Projects::MilestonesController do
       it 'shows group milestone' do
         post :promote, namespace_id: project.namespace.id, project_id: project.id, id: milestone.iid
 
-        group_milestone = assigns(:milestone)
-
-        expect(response).to redirect_to(group_milestone_path(project.group, group_milestone.iid))
-        expect(flash[:notice]).to eq('Milestone has been promoted to group milestone.')
+        expect(flash[:notice]).to eq("#{milestone.title} promoted to group milestone")
+        expect(response).to redirect_to(project_milestones_path(project))
       end
     end
 
diff --git a/spec/features/merge_request/maintainer_edits_fork_spec.rb b/spec/features/merge_request/maintainer_edits_fork_spec.rb
new file mode 100644
index 00000000000..a3323da1b1f
--- /dev/null
+++ b/spec/features/merge_request/maintainer_edits_fork_spec.rb
@@ -0,0 +1,44 @@
+require 'spec_helper'
+
+describe 'a maintainer edits files on a source-branch of an MR from a fork', :js do
+  include ProjectForksHelper
+  let(:user) { create(:user, username: 'the-maintainer') }
+  let(:target_project) { create(:project, :public, :repository) }
+  let(:author) { create(:user, username: 'mr-authoring-machine') }
+  let(:source_project) { fork_project(target_project, author, repository: true) }
+
+  let(:merge_request) do
+    create(:merge_request,
+           source_project: source_project,
+           target_project: target_project,
+           source_branch: 'fix',
+           target_branch: 'master',
+           author: author,
+           allow_maintainer_to_push: true)
+  end
+
+  before do
+    target_project.add_master(user)
+    sign_in(user)
+
+    visit project_merge_request_path(target_project, merge_request)
+    click_link 'Changes'
+    wait_for_requests
+    first('.js-file-title').click_link 'Edit'
+    wait_for_requests
+  end
+
+  it 'mentions commits will go to the source branch' do
+    expect(page).to have_content('Your changes can be committed to fix because a merge request is open.')
+  end
+
+  it 'allows committing to the source branch' do
+    find('.ace_text-input', visible: false).send_keys('Updated the readme')
+
+    click_button 'Commit changes'
+    wait_for_requests
+
+    expect(page).to have_content('Your changes have been successfully committed')
+    expect(page).to have_content('Updated the readme')
+  end
+end
diff --git a/spec/features/merge_request/user_allows_a_maintainer_to_push_spec.rb b/spec/features/merge_request/user_allows_a_maintainer_to_push_spec.rb
new file mode 100644
index 00000000000..eb41d7de8ed
--- /dev/null
+++ b/spec/features/merge_request/user_allows_a_maintainer_to_push_spec.rb
@@ -0,0 +1,85 @@
+require 'spec_helper'
+
+describe 'create a merge request that allows maintainers to push', :js do
+  include ProjectForksHelper
+  let(:user) { create(:user) }
+  let(:target_project) { create(:project, :public, :repository) }
+  let(:source_project) { fork_project(target_project, user, repository: true, namespace: user.namespace) }
+
+  def visit_new_merge_request
+    visit project_new_merge_request_path(
+      source_project,
+      merge_request: {
+        source_project_id: source_project.id,
+        target_project_id: target_project.id,
+        source_branch: 'fix',
+        target_branch: 'master'
+      })
+  end
+
+  before do
+    sign_in(user)
+  end
+
+  it 'allows setting maintainer push possible' do
+    visit_new_merge_request
+
+    check 'Allow edits from maintainers'
+
+    click_button 'Submit merge request'
+
+    wait_for_requests
+
+    expect(page).to have_content('Allows edits from maintainers')
+  end
+
+  it 'shows a message when one of the projects is private' do
+    source_project.update!(visibility_level: Gitlab::VisibilityLevel::PRIVATE)
+
+    visit_new_merge_request
+
+    expect(page).to have_content('Not available for private projects')
+  end
+
+  it 'shows a message when the source branch is protected' do
+    create(:protected_branch, project: source_project, name: 'fix')
+
+    visit_new_merge_request
+
+    expect(page).to have_content('Not available for protected branches')
+  end
+
+  context 'when the merge request is being created within the same project' do
+    let(:source_project) { target_project }
+
+    it 'hides the checkbox if the merge request is being created within the same project' do
+      target_project.add_developer(user)
+
+      visit_new_merge_request
+
+      expect(page).not_to have_content('Allows edits from maintainers')
+    end
+  end
+
+  context 'when a maintainer tries to edit the option' do
+    let(:maintainer) { create(:user) }
+    let(:merge_request) do
+      create(:merge_request,
+             source_project: source_project,
+             target_project: target_project,
+             source_branch: 'fixes')
+    end
+
+    before do
+      target_project.add_master(maintainer)
+
+      sign_in(maintainer)
+    end
+
+    it 'it hides the option from maintainers' do
+      visit edit_project_merge_request_path(target_project, merge_request)
+
+      expect(page).not_to have_content('Allows edits from maintainers')
+    end
+  end
+end
diff --git a/spec/features/projects/user_creates_files_spec.rb b/spec/features/projects/user_creates_files_spec.rb
index 7a935dd2477..8993533676b 100644
--- a/spec/features/projects/user_creates_files_spec.rb
+++ b/spec/features/projects/user_creates_files_spec.rb
@@ -133,13 +133,20 @@ describe 'User creates files' do
       before do
         project2.add_reporter(user)
         visit(project2_tree_path_root_ref)
-      end
 
-      it 'creates and commit new file in forked project', :js do
         find('.add-to-tree').click
         click_link('New file')
+      end
+
+      it 'shows a message saying the file will be committed in a fork' do
+        message = "A new branch will be created in your fork and a new merge request will be started."
 
+        expect(page).to have_content(message)
+      end
+
+      it 'creates and commit new file in forked project', :js do
         expect(page).to have_selector('.file-editor')
+        expect(page).to have_content
 
         find('#editor')
         execute_script("ace.edit('editor').setValue('*.rbca')")
diff --git a/spec/fixtures/api/schemas/entities/merge_request_basic.json b/spec/fixtures/api/schemas/entities/merge_request_basic.json
index f1199468d53..46031961cca 100644
--- a/spec/fixtures/api/schemas/entities/merge_request_basic.json
+++ b/spec/fixtures/api/schemas/entities/merge_request_basic.json
@@ -12,7 +12,8 @@
     "rebase_in_progress": { "type": "boolean" },
     "assignee_id": { "type": ["integer", "null"] },
     "subscribed": { "type": ["boolean", "null"] },
-    "participants": { "type": "array" }
+    "participants": { "type": "array" },
+    "allow_maintainer_to_push": { "type": "boolean"}
   },
   "additionalProperties": false
 }
diff --git a/spec/fixtures/api/schemas/entities/merge_request_widget.json b/spec/fixtures/api/schemas/entities/merge_request_widget.json
index cfbeec58a45..a622bf88b13 100644
--- a/spec/fixtures/api/schemas/entities/merge_request_widget.json
+++ b/spec/fixtures/api/schemas/entities/merge_request_widget.json
@@ -30,6 +30,7 @@
     "source_project_id": { "type": "integer" },
     "target_branch": { "type": "string" },
     "target_project_id": { "type": "integer" },
+    "allow_maintainer_to_push": { "type": "boolean"},
     "metrics": {
       "oneOf": [
         { "type": "null" },
diff --git a/spec/fixtures/api/schemas/public_api/v4/merge_requests.json b/spec/fixtures/api/schemas/public_api/v4/merge_requests.json
index e86176e5316..0dc2eabec5d 100644
--- a/spec/fixtures/api/schemas/public_api/v4/merge_requests.json
+++ b/spec/fixtures/api/schemas/public_api/v4/merge_requests.json
@@ -80,7 +80,8 @@
         "total_time_spent": { "type": "integer" },
         "human_time_estimate": { "type": ["string", "null"] },
         "human_total_time_spent": { "type": ["string", "null"] }
-      }
+      },
+      "allow_maintainer_to_push": { "type": ["boolean", "null"] }
     },
     "required": [
       "id", "iid", "project_id", "title", "description",
diff --git a/spec/helpers/tree_helper_spec.rb b/spec/helpers/tree_helper_spec.rb
index d3b1be599dd..ccac6e29447 100644
--- a/spec/helpers/tree_helper_spec.rb
+++ b/spec/helpers/tree_helper_spec.rb
@@ -62,4 +62,13 @@ describe TreeHelper do
       end
     end
   end
+
+  describe '#commit_in_single_accessible_branch' do
+    it 'escapes HTML from the branch name' do
+      helper.instance_variable_set(:@branch_name, "<script>alert('escape me!');</script>")
+      escaped_branch_name = '&lt;script&gt;alert(&#39;escape me!&#39;);&lt;/script&gt;'
+
+      expect(helper.commit_in_single_accessible_branch).to include(escaped_branch_name)
+    end
+  end
 end
diff --git a/spec/javascripts/pages/labels/components/promote_label_modal_spec.js b/spec/javascripts/pages/labels/components/promote_label_modal_spec.js
new file mode 100644
index 00000000000..ba2e07f02f7
--- /dev/null
+++ b/spec/javascripts/pages/labels/components/promote_label_modal_spec.js
@@ -0,0 +1,88 @@
+import Vue from 'vue';
+import promoteLabelModal from '~/pages/projects/labels/components/promote_label_modal.vue';
+import eventHub from '~/pages/projects/labels/event_hub';
+import axios from '~/lib/utils/axios_utils';
+import mountComponent from '../../../helpers/vue_mount_component_helper';
+
+describe('Promote label modal', () => {
+  let vm;
+  const Component = Vue.extend(promoteLabelModal);
+  const labelMockData = {
+    labelTitle: 'Documentation',
+    labelColor: '#5cb85c',
+    labelTextColor: '#ffffff',
+    url: `${gl.TEST_HOST}/dummy/promote/labels`,
+  };
+
+  describe('Modal title and description', () => {
+    beforeEach(() => {
+      vm = mountComponent(Component, labelMockData);
+    });
+
+    afterEach(() => {
+      vm.$destroy();
+    });
+
+    it('contains the proper description', () => {
+      expect(vm.text).toContain('Promoting this label will make it available for all projects inside the group');
+    });
+
+    it('contains a label span with the color', () => {
+      const labelFromTitle = vm.$el.querySelector('.modal-header .label.color-label');
+
+      expect(labelFromTitle.style.backgroundColor).not.toBe(null);
+      expect(labelFromTitle.textContent).toContain(vm.labelTitle);
+    });
+  });
+
+  describe('When requesting a label promotion', () => {
+    beforeEach(() => {
+      vm = mountComponent(Component, {
+        ...labelMockData,
+      });
+      spyOn(eventHub, '$emit');
+    });
+
+    afterEach(() => {
+      vm.$destroy();
+    });
+
+    it('redirects when a label is promoted', (done) => {
+      const responseURL = `${gl.TEST_HOST}/dummy/endpoint`;
+      spyOn(axios, 'post').and.callFake((url) => {
+        expect(url).toBe(labelMockData.url);
+        expect(eventHub.$emit).toHaveBeenCalledWith('promoteLabelModal.requestStarted', labelMockData.url);
+        return Promise.resolve({
+          request: {
+            responseURL,
+          },
+        });
+      });
+
+      vm.onSubmit()
+        .then(() => {
+          expect(eventHub.$emit).toHaveBeenCalledWith('promoteLabelModal.requestFinished', { labelUrl: labelMockData.url, successful: true });
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+
+    it('displays an error if promoting a label failed', (done) => {
+      const dummyError = new Error('promoting label failed');
+      dummyError.response = { status: 500 };
+      spyOn(axios, 'post').and.callFake((url) => {
+        expect(url).toBe(labelMockData.url);
+        expect(eventHub.$emit).toHaveBeenCalledWith('promoteLabelModal.requestStarted', labelMockData.url);
+        return Promise.reject(dummyError);
+      });
+
+      vm.onSubmit()
+        .catch((error) => {
+          expect(error).toBe(dummyError);
+          expect(eventHub.$emit).toHaveBeenCalledWith('promoteLabelModal.requestFinished', { labelUrl: labelMockData.url, successful: false });
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+  });
+});
diff --git a/spec/javascripts/pages/milestones/shared/components/promote_milestone_modal_spec.js b/spec/javascripts/pages/milestones/shared/components/promote_milestone_modal_spec.js
new file mode 100644
index 00000000000..bf044fe8fb5
--- /dev/null
+++ b/spec/javascripts/pages/milestones/shared/components/promote_milestone_modal_spec.js
@@ -0,0 +1,83 @@
+import Vue from 'vue';
+import promoteMilestoneModal from '~/pages/milestones/shared/components/promote_milestone_modal.vue';
+import eventHub from '~/pages/milestones/shared/event_hub';
+import axios from '~/lib/utils/axios_utils';
+import mountComponent from '../../../../helpers/vue_mount_component_helper';
+
+describe('Promote milestone modal', () => {
+  let vm;
+  const Component = Vue.extend(promoteMilestoneModal);
+  const milestoneMockData = {
+    milestoneTitle: 'v1.0',
+    url: `${gl.TEST_HOST}/dummy/promote/milestones`,
+  };
+
+  describe('Modal title and description', () => {
+    beforeEach(() => {
+      vm = mountComponent(Component, milestoneMockData);
+    });
+
+    afterEach(() => {
+      vm.$destroy();
+    });
+
+    it('contains the proper description', () => {
+      expect(vm.text).toContain('Promoting this milestone will make it available for all projects inside the group.');
+    });
+
+    it('contains the correct title', () => {
+      expect(vm.title).toEqual('Promote v1.0 to group milestone?');
+    });
+  });
+
+  describe('When requesting a milestone promotion', () => {
+    beforeEach(() => {
+      vm = mountComponent(Component, {
+        ...milestoneMockData,
+      });
+      spyOn(eventHub, '$emit');
+    });
+
+    afterEach(() => {
+      vm.$destroy();
+    });
+
+    it('redirects when a milestone is promoted', (done) => {
+      const responseURL = `${gl.TEST_HOST}/dummy/endpoint`;
+      spyOn(axios, 'post').and.callFake((url) => {
+        expect(url).toBe(milestoneMockData.url);
+        expect(eventHub.$emit).toHaveBeenCalledWith('promoteMilestoneModal.requestStarted', milestoneMockData.url);
+        return Promise.resolve({
+          request: {
+            responseURL,
+          },
+        });
+      });
+
+      vm.onSubmit()
+        .then(() => {
+          expect(eventHub.$emit).toHaveBeenCalledWith('promoteMilestoneModal.requestFinished', { milestoneUrl: milestoneMockData.url, successful: true });
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+
+    it('displays an error if promoting a milestone failed', (done) => {
+      const dummyError = new Error('promoting milestone failed');
+      dummyError.response = { status: 500 };
+      spyOn(axios, 'post').and.callFake((url) => {
+        expect(url).toBe(milestoneMockData.url);
+        expect(eventHub.$emit).toHaveBeenCalledWith('promoteMilestoneModal.requestStarted', milestoneMockData.url);
+        return Promise.reject(dummyError);
+      });
+
+      vm.onSubmit()
+        .catch((error) => {
+          expect(error).toBe(dummyError);
+          expect(eventHub.$emit).toHaveBeenCalledWith('promoteMilestoneModal.requestFinished', { milestoneUrl: milestoneMockData.url, successful: false });
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+  });
+});
diff --git a/spec/javascripts/vue_mr_widget/components/mr_widget_maintainer_edit_spec.js b/spec/javascripts/vue_mr_widget/components/mr_widget_maintainer_edit_spec.js
new file mode 100644
index 00000000000..65b3f721281
--- /dev/null
+++ b/spec/javascripts/vue_mr_widget/components/mr_widget_maintainer_edit_spec.js
@@ -0,0 +1,23 @@
+import Vue from 'vue';
+import maintainerEditComponent from '~/vue_merge_request_widget/components/mr_widget_maintainer_edit.vue';
+import mountComponent from 'spec/helpers/vue_mount_component_helper';
+
+describe('MRWidgetAuthor', () => {
+  let vm;
+
+  beforeEach(() => {
+    const Component = Vue.extend(maintainerEditComponent);
+
+    vm = mountComponent(Component, {
+      maintainerEditAllowed: true,
+    });
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  it('renders the message when maintainers are allowed to edit', () => {
+    expect(vm.$el.textContent.trim()).toEqual('Allows edits from maintainers');
+  });
+});
diff --git a/spec/javascripts/vue_mr_widget/mr_widget_options_spec.js b/spec/javascripts/vue_mr_widget/mr_widget_options_spec.js
index 18ba34b55a5..ebe151ac3b1 100644
--- a/spec/javascripts/vue_mr_widget/mr_widget_options_spec.js
+++ b/spec/javascripts/vue_mr_widget/mr_widget_options_spec.js
@@ -349,6 +349,7 @@ describe('mrWidgetOptions', () => {
       expect(comps['mr-widget-pipeline-blocked']).toBeDefined();
       expect(comps['mr-widget-pipeline-failed']).toBeDefined();
       expect(comps['mr-widget-merge-when-pipeline-succeeds']).toBeDefined();
+      expect(comps['mr-widget-maintainer-edit']).toBeDefined();
     });
   });
 
diff --git a/spec/lib/gitlab/checks/change_access_spec.rb b/spec/lib/gitlab/checks/change_access_spec.rb
index b49ddbfc780..48e9902027c 100644
--- a/spec/lib/gitlab/checks/change_access_spec.rb
+++ b/spec/lib/gitlab/checks/change_access_spec.rb
@@ -30,9 +30,10 @@ describe Gitlab::Checks::ChangeAccess do
       end
     end
 
-    context 'when the user is not allowed to push code' do
+    context 'when the user is not allowed to push to the repo' do
       it 'raises an error' do
         expect(user_access).to receive(:can_do_action?).with(:push_code).and_return(false)
+        expect(user_access).to receive(:can_push_to_branch?).with('master').and_return(false)
 
         expect { subject.exec }.to raise_error(Gitlab::GitAccess::UnauthorizedError, 'You are not allowed to push code to this project.')
       end
diff --git a/spec/lib/gitlab/import_export/all_models.yml b/spec/lib/gitlab/import_export/all_models.yml
index b20cc34dd5c..bece82e531a 100644
--- a/spec/lib/gitlab/import_export/all_models.yml
+++ b/spec/lib/gitlab/import_export/all_models.yml
@@ -278,6 +278,7 @@ project:
 - custom_attributes
 - lfs_file_locks
 - project_badges
+- source_of_merge_requests
 award_emoji:
 - awardable
 - user
diff --git a/spec/lib/gitlab/import_export/safe_model_attributes.yml b/spec/lib/gitlab/import_export/safe_model_attributes.yml
index ddcbb7a0033..0b938892da5 100644
--- a/spec/lib/gitlab/import_export/safe_model_attributes.yml
+++ b/spec/lib/gitlab/import_export/safe_model_attributes.yml
@@ -168,6 +168,7 @@ MergeRequest:
 - last_edited_by_id
 - head_pipeline_id
 - discussion_locked
+- allow_maintainer_to_push
 MergeRequestDiff:
 - id
 - state
diff --git a/spec/lib/gitlab/user_access_spec.rb b/spec/lib/gitlab/user_access_spec.rb
index 7280acb6c82..40c8286b1b9 100644
--- a/spec/lib/gitlab/user_access_spec.rb
+++ b/spec/lib/gitlab/user_access_spec.rb
@@ -1,6 +1,8 @@
 require 'spec_helper'
 
 describe Gitlab::UserAccess do
+  include ProjectForksHelper
+
   let(:access) { described_class.new(user, project: project) }
   let(:project) { create(:project, :repository) }
   let(:user) { create(:user) }
@@ -118,6 +120,39 @@ describe Gitlab::UserAccess do
       end
     end
 
+    describe 'allowing pushes to maintainers of forked projects' do
+      let(:canonical_project) { create(:project, :public, :repository) }
+      let(:project) { fork_project(canonical_project, create(:user), repository: true) }
+
+      before do
+        create(
+          :merge_request,
+          target_project: canonical_project,
+          source_project: project,
+          source_branch: 'awesome-feature',
+          allow_maintainer_to_push: true
+        )
+      end
+
+      it 'allows users that have push access to the canonical project to push to the MR branch' do
+        canonical_project.add_developer(user)
+
+        expect(access.can_push_to_branch?('awesome-feature')).to be_truthy
+      end
+
+      it 'does not allow the user to push to other branches' do
+        canonical_project.add_developer(user)
+
+        expect(access.can_push_to_branch?('master')).to be_falsey
+      end
+
+      it 'does not allow the user to push if he does not have push access to the canonical project' do
+        canonical_project.add_guest(user)
+
+        expect(access.can_push_to_branch?('awesome-feature')).to be_falsey
+      end
+    end
+
     describe 'merge to protected branch if allowed for developers' do
       before do
         @branch = create :protected_branch, :developers_can_merge, project: project
diff --git a/spec/models/merge_request_spec.rb b/spec/models/merge_request_spec.rb
index 243eeddc7a8..7986aa31e16 100644
--- a/spec/models/merge_request_spec.rb
+++ b/spec/models/merge_request_spec.rb
@@ -2084,4 +2084,82 @@ describe MergeRequest do
       it_behaves_like 'checking whether a rebase is in progress'
     end
   end
+
+  describe '#allow_maintainer_to_push' do
+    let(:merge_request) do
+      build(:merge_request, source_branch: 'fixes', allow_maintainer_to_push: true)
+    end
+
+    it 'is false when pushing by a maintainer is not possible' do
+      expect(merge_request).to receive(:maintainer_push_possible?) { false }
+
+      expect(merge_request.allow_maintainer_to_push).to be_falsy
+    end
+
+    it 'is true when pushing by a maintainer is possible' do
+      expect(merge_request).to receive(:maintainer_push_possible?) { true }
+
+      expect(merge_request.allow_maintainer_to_push).to be_truthy
+    end
+  end
+
+  describe '#maintainer_push_possible?' do
+    let(:merge_request) do
+      build(:merge_request, source_branch: 'fixes')
+    end
+
+    before do
+      allow(ProtectedBranch).to receive(:protected?) { false }
+    end
+
+    it 'does not allow maintainer to push if the source project is the same as the target' do
+      merge_request.target_project = merge_request.source_project = create(:project, :public)
+
+      expect(merge_request.maintainer_push_possible?).to be_falsy
+    end
+
+    it 'allows maintainer to push when both source and target are public' do
+      merge_request.target_project = build(:project, :public)
+      merge_request.source_project = build(:project, :public)
+
+      expect(merge_request.maintainer_push_possible?).to be_truthy
+    end
+
+    it 'is not available for protected branches' do
+      merge_request.target_project = build(:project, :public)
+      merge_request.source_project = build(:project, :public)
+
+      expect(ProtectedBranch).to receive(:protected?)
+                                   .with(merge_request.source_project, 'fixes')
+                                   .and_return(true)
+
+      expect(merge_request.maintainer_push_possible?).to be_falsy
+    end
+  end
+
+  describe '#can_allow_maintainer_to_push?' do
+    let(:target_project) { create(:project, :public) }
+    let(:source_project) { fork_project(target_project) }
+    let(:merge_request) do
+      create(:merge_request,
+             source_project: source_project,
+             source_branch: 'fixes',
+             target_project: target_project)
+    end
+    let(:user) { create(:user) }
+
+    before do
+      allow(merge_request).to receive(:maintainer_push_possible?) { true }
+    end
+
+    it 'is false if the user does not have push access to the source project' do
+      expect(merge_request.can_allow_maintainer_to_push?(user)).to be_falsy
+    end
+
+    it 'is true when the user has push access to the source project' do
+      source_project.add_developer(user)
+
+      expect(merge_request.can_allow_maintainer_to_push?(user)).to be_truthy
+    end
+  end
 end
diff --git a/spec/models/project_spec.rb b/spec/models/project_spec.rb
index b1c9e6754b9..e970cd7dfdb 100644
--- a/spec/models/project_spec.rb
+++ b/spec/models/project_spec.rb
@@ -1,6 +1,8 @@
 require 'spec_helper'
 
 describe Project do
+  include ProjectForksHelper
+
   describe 'associations' do
     it { is_expected.to belong_to(:group) }
     it { is_expected.to belong_to(:namespace) }
@@ -3378,4 +3380,103 @@ describe Project do
       end
     end
   end
+
+  context 'with cross project merge requests' do
+    let(:user) { create(:user) }
+    let(:target_project) { create(:project, :repository) }
+    let(:project) { fork_project(target_project, nil, repository: true) }
+    let!(:merge_request) do
+      create(
+        :merge_request,
+        target_project: target_project,
+        target_branch: 'target-branch',
+        source_project: project,
+        source_branch: 'awesome-feature-1',
+        allow_maintainer_to_push: true
+      )
+    end
+
+    before do
+      target_project.add_developer(user)
+    end
+
+    describe '#merge_requests_allowing_push_to_user' do
+      it 'returns open merge requests for which the user has developer access to the target project' do
+        expect(project.merge_requests_allowing_push_to_user(user)).to include(merge_request)
+      end
+
+      it 'does not include closed merge requests' do
+        merge_request.close
+
+        expect(project.merge_requests_allowing_push_to_user(user)).to be_empty
+      end
+
+      it 'does not include merge requests for guest users' do
+        guest = create(:user)
+        target_project.add_guest(guest)
+
+        expect(project.merge_requests_allowing_push_to_user(guest)).to be_empty
+      end
+
+      it 'does not include the merge request for other users' do
+        other_user = create(:user)
+
+        expect(project.merge_requests_allowing_push_to_user(other_user)).to be_empty
+      end
+
+      it 'is empty when no user is passed' do
+        expect(project.merge_requests_allowing_push_to_user(nil)).to be_empty
+      end
+    end
+
+    describe '#branch_allows_maintainer_push?' do
+      it 'allows access if the user can merge the merge request' do
+        expect(project.branch_allows_maintainer_push?(user, 'awesome-feature-1'))
+          .to be_truthy
+      end
+
+      it 'does not allow guest users access' do
+        guest = create(:user)
+        target_project.add_guest(guest)
+
+        expect(project.branch_allows_maintainer_push?(guest, 'awesome-feature-1'))
+          .to be_falsy
+      end
+
+      it 'does not allow access to branches for which the merge request was closed' do
+        create(:merge_request, :closed,
+               target_project: target_project,
+               target_branch: 'target-branch',
+               source_project: project,
+               source_branch: 'rejected-feature-1',
+               allow_maintainer_to_push: true)
+
+        expect(project.branch_allows_maintainer_push?(user, 'rejected-feature-1'))
+          .to be_falsy
+      end
+
+      it 'does not allow access if the user cannot merge the merge request' do
+        create(:protected_branch, :masters_can_push, project: target_project, name: 'target-branch')
+
+        expect(project.branch_allows_maintainer_push?(user, 'awesome-feature-1'))
+          .to be_falsy
+      end
+
+      it 'caches the result' do
+        control = ActiveRecord::QueryRecorder.new { project.branch_allows_maintainer_push?(user, 'awesome-feature-1') }
+
+        expect { 3.times { project.branch_allows_maintainer_push?(user, 'awesome-feature-1') } }
+          .not_to exceed_query_limit(control)
+      end
+
+      context 'when the requeststore is active', :request_store do
+        it 'only queries per project across instances' do
+          control = ActiveRecord::QueryRecorder.new { project.branch_allows_maintainer_push?(user, 'awesome-feature-1') }
+
+          expect { 2.times { described_class.find(project.id).branch_allows_maintainer_push?(user, 'awesome-feature-1') } }
+            .not_to exceed_query_limit(control).with_threshold(2)
+        end
+      end
+    end
+  end
 end
diff --git a/spec/policies/project_policy_spec.rb b/spec/policies/project_policy_spec.rb
index 129344f105f..ea76e604153 100644
--- a/spec/policies/project_policy_spec.rb
+++ b/spec/policies/project_policy_spec.rb
@@ -308,4 +308,41 @@ describe ProjectPolicy do
   it_behaves_like 'project policies as master'
   it_behaves_like 'project policies as owner'
   it_behaves_like 'project policies as admin'
+
+  context 'when a public project has merge requests allowing access' do
+    include ProjectForksHelper
+    let(:user) { create(:user) }
+    let(:target_project) { create(:project, :public) }
+    let(:project) { fork_project(target_project) }
+    let!(:merge_request) do
+      create(
+        :merge_request,
+        target_project: target_project,
+        source_project: project,
+        allow_maintainer_to_push: true
+      )
+    end
+    let(:maintainer_abilities) do
+      %w(create_build update_build create_pipeline update_pipeline)
+    end
+
+    subject { described_class.new(user, project) }
+
+    it 'does not allow pushing code' do
+      expect_disallowed(*maintainer_abilities)
+    end
+
+    it 'allows pushing if the user is a member with push access to the target project' do
+      target_project.add_developer(user)
+
+      expect_allowed(*maintainer_abilities)
+    end
+
+    it 'dissallows abilities to a maintainer if the merge request was closed' do
+      target_project.add_developer(user)
+      merge_request.close!
+
+      expect_disallowed(*maintainer_abilities)
+    end
+  end
 end
diff --git a/spec/requests/api/internal_spec.rb b/spec/requests/api/internal_spec.rb
index 827f4c04324..ca0aac87ba9 100644
--- a/spec/requests/api/internal_spec.rb
+++ b/spec/requests/api/internal_spec.rb
@@ -335,21 +335,8 @@ describe API::Internal do
       end
 
       context "git push" do
-        context "gitaly disabled", :disable_gitaly do
-          it "has the correct payload" do
-            push(key, project)
-
-            expect(response).to have_gitlab_http_status(200)
-            expect(json_response["status"]).to be_truthy
-            expect(json_response["repository_path"]).to eq(project.repository.path_to_repo)
-            expect(json_response["gl_repository"]).to eq("project-#{project.id}")
-            expect(json_response["gitaly"]).to be_nil
-            expect(user).not_to have_an_activity_record
-          end
-        end
-
-        context "gitaly enabled" do
-          it "has the correct payload" do
+        context 'project as namespace/project' do
+          it do
             push(key, project)
 
             expect(response).to have_gitlab_http_status(200)
@@ -365,17 +352,6 @@ describe API::Internal do
             expect(user).not_to have_an_activity_record
           end
         end
-
-        context 'project as namespace/project' do
-          it do
-            push(key, project)
-
-            expect(response).to have_gitlab_http_status(200)
-            expect(json_response["status"]).to be_truthy
-            expect(json_response["repository_path"]).to eq(project.repository.path_to_repo)
-            expect(json_response["gl_repository"]).to eq("project-#{project.id}")
-          end
-        end
       end
     end
 
diff --git a/spec/requests/api/merge_requests_spec.rb b/spec/requests/api/merge_requests_spec.rb
index 484322752c0..3764aec0c71 100644
--- a/spec/requests/api/merge_requests_spec.rb
+++ b/spec/requests/api/merge_requests_spec.rb
@@ -616,6 +616,25 @@ describe API::MergeRequests do
         expect(json_response['changes_count']).to eq('5+')
       end
     end
+
+    context 'for forked projects' do
+      let(:user2) { create(:user) }
+      let(:project) { create(:project, :public, :repository) }
+      let(:forked_project) { fork_project(project, user2, repository: true) }
+      let(:merge_request) do
+        create(:merge_request,
+               source_project: forked_project,
+               target_project: project,
+               source_branch: 'fixes',
+               allow_maintainer_to_push: true)
+      end
+
+      it 'includes the `allow_maintainer_to_push` field' do
+        get api("/projects/#{project.id}/merge_requests/#{merge_request.iid}", user)
+
+        expect(json_response['allow_maintainer_to_push']).to be_truthy
+      end
+    end
   end
 
   describe 'GET /projects/:id/merge_requests/:merge_request_iid/participants' do
@@ -815,6 +834,7 @@ describe API::MergeRequests do
 
     context 'forked projects' do
       let!(:user2) { create(:user) }
+      let(:project) { create(:project, :public, :repository) }
       let!(:forked_project) { fork_project(project, user2, repository: true) }
       let!(:unrelated_project) { create(:project,  namespace: create(:user).namespace, creator_id: user2.id) }
 
@@ -872,6 +892,14 @@ describe API::MergeRequests do
         expect(response).to have_gitlab_http_status(400)
       end
 
+      it 'allows setting `allow_maintainer_to_push`' do
+        post api("/projects/#{forked_project.id}/merge_requests", user2),
+          title: 'Test merge_request', source_branch: "feature_conflict", target_branch: "master",
+          author: user2, target_project_id: project.id, allow_maintainer_to_push: true
+        expect(response).to have_gitlab_http_status(201)
+        expect(json_response['allow_maintainer_to_push']).to be_truthy
+      end
+
       context 'when target_branch and target_project_id is specified' do
         let(:params) do
           { title: 'Test merge_request',
diff --git a/spec/services/merge_requests/update_service_spec.rb b/spec/services/merge_requests/update_service_spec.rb
index c31259239ee..5279ea6164e 100644
--- a/spec/services/merge_requests/update_service_spec.rb
+++ b/spec/services/merge_requests/update_service_spec.rb
@@ -1,6 +1,8 @@
 require 'spec_helper'
 
 describe MergeRequests::UpdateService, :mailer do
+  include ProjectForksHelper
+
   let(:project) { create(:project, :repository) }
   let(:user) { create(:user) }
   let(:user2) { create(:user) }
@@ -538,5 +540,40 @@ describe MergeRequests::UpdateService, :mailer do
       let(:open_issuable) { merge_request }
       let(:closed_issuable) { create(:closed_merge_request, source_project: project) }
     end
+
+    context 'setting `allow_maintainer_to_push`' do
+      let(:target_project) { create(:project, :public) }
+      let(:source_project) { fork_project(target_project) }
+      let(:user) { create(:user) }
+      let(:merge_request) do
+        create(:merge_request,
+               source_project: source_project,
+               source_branch: 'fixes',
+               target_project: target_project)
+      end
+
+      before do
+        allow(ProtectedBranch).to receive(:protected?).with(source_project, 'fixes') { false }
+      end
+
+      it 'does not allow a maintainer of the target project to set `allow_maintainer_to_push`' do
+        target_project.add_developer(user)
+
+        update_merge_request(allow_maintainer_to_push: true, title: 'Updated title')
+
+        expect(merge_request.title).to eq('Updated title')
+        expect(merge_request.allow_maintainer_to_push).to be_falsy
+      end
+
+      it 'is allowed by a user that can push to the source and can update the merge request' do
+        merge_request.update!(assignee: user)
+        source_project.add_developer(user)
+
+        update_merge_request(allow_maintainer_to_push: true, title: 'Updated title')
+
+        expect(merge_request.title).to eq('Updated title')
+        expect(merge_request.allow_maintainer_to_push).to be_truthy
+      end
+    end
   end
 end
diff --git a/spec/views/projects/tree/show.html.haml_spec.rb b/spec/views/projects/tree/show.html.haml_spec.rb
index 44b32df0395..3b098320ad7 100644
--- a/spec/views/projects/tree/show.html.haml_spec.rb
+++ b/spec/views/projects/tree/show.html.haml_spec.rb
@@ -13,6 +13,7 @@ describe 'projects/tree/show' do
 
     allow(view).to receive(:can?).and_return(true)
     allow(view).to receive(:can_collaborate_with_project?).and_return(true)
+    allow(view).to receive_message_chain('user_access.can_push_to_branch?').and_return(true)
     allow(view).to receive(:current_application_settings).and_return(Gitlab::CurrentSettings.current_application_settings)
   end