Merge branch 'api_only_allow_merge_if_build_succeeds' into 'master'

expose 'only_allow_merge_if_build_succeeds' project setting in the API

## What does this MR do?
Adds the 'only_allow_merge_if_build_succeeds' project setting in the API.

## Are there points in the code the reviewer needs to double check?
No, but maybe this code is not enough for ACLs or the like.

## Why was this MR needed?
Because that's a very useful setting to change via automation (through the API)

## What are the relevant issue numbers?

Closes #21085, closes https://gitlab.com/gitlab-org/gitlab-ce/issues/20088.

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [X] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [X] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [X] API support added
- Tests
  - [X] Added for this feature/bug
  - [X] All builds are passing
- [X] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [X] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [X] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5930

6 files changed, 53 insertions, 12 deletions

diff --git a/CHANGELOG b/CHANGELOG
index b91dce67a29..69ad046dd11 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -6,6 +6,7 @@ v 8.12.0 (unreleased)
   - Optimistic locking for Issues and Merge Requests (title and description overriding prevention)
   - Add `wiki_page_events` to project hook APIs (Ben Boeckel)
   - Added tests for diff notes
+  - Added 'only_allow_merge_if_build_succeeds' project setting in the API. !5930 (Duck)
 
 v 8.11.2 (unreleased)
   - Show "Create Merge Request" widget for push events to fork projects on the source project
diff --git a/doc/api/projects.md b/doc/api/projects.md
index 156deca932b..0e4806e31c5 100644
--- a/doc/api/projects.md
+++ b/doc/api/projects.md
@@ -84,7 +84,8 @@ Parameters:
     "star_count": 0,
     "runners_token": "b8547b1dc37721d05889db52fa2f02",
     "public_builds": true,
-    "shared_with_groups": []
+    "shared_with_groups": [],
+    "only_allow_merge_if_build_succeeds": false
   },
   {
     "id": 6,
@@ -144,7 +145,8 @@ Parameters:
     "star_count": 0,
     "runners_token": "b8547b1dc37721d05889db52fa2f02",
     "public_builds": true,
-    "shared_with_groups": []
+    "shared_with_groups": [],
+    "only_allow_merge_if_build_succeeds": false
   }
 ]
 ```
@@ -280,7 +282,8 @@ Parameters:
       "group_name": "Gitlab Org",
       "group_access_level": 10
     }
-  ]
+  ],
+  "only_allow_merge_if_build_succeeds": false
 }
 ```
 
@@ -448,6 +451,7 @@ Parameters:
 - `visibility_level` (optional)
 - `import_url` (optional)
 - `public_builds` (optional)
+- `only_allow_merge_if_build_succeeds` (optional)
 
 ### Create project for user
 
@@ -473,6 +477,7 @@ Parameters:
 - `visibility_level` (optional)
 - `import_url` (optional)
 - `public_builds` (optional)
+- `only_allow_merge_if_build_succeeds` (optional)
 
 ### Edit project
 
@@ -499,6 +504,7 @@ Parameters:
 - `public` (optional) - if `true` same as setting visibility_level = 20
 - `visibility_level` (optional)
 - `public_builds` (optional)
+- `only_allow_merge_if_build_succeeds` (optional)
 
 On success, method returns 200 with the updated project. If parameters are
 invalid, 400 is returned.
@@ -577,7 +583,8 @@ Example response:
   "forks_count": 0,
   "star_count": 1,
   "public_builds": true,
-  "shared_with_groups": []
+  "shared_with_groups": [],
+  "only_allow_merge_if_build_succeeds": false
 }
 ```
 
@@ -643,7 +650,8 @@ Example response:
   "forks_count": 0,
   "star_count": 0,
   "public_builds": true,
-  "shared_with_groups": []
+  "shared_with_groups": [],
+  "only_allow_merge_if_build_succeeds": false
 }
 ```
 
@@ -729,7 +737,8 @@ Example response:
   "star_count": 0,
   "runners_token": "b8bc4a7a29eb76ea83cf79e4908c2b",
   "public_builds": true,
-  "shared_with_groups": []
+  "shared_with_groups": [],
+  "only_allow_merge_if_build_succeeds": false
 }
 ```
 
@@ -815,7 +824,8 @@ Example response:
   "star_count": 0,
   "runners_token": "b8bc4a7a29eb76ea83cf79e4908c2b",
   "public_builds": true,
-  "shared_with_groups": []
+  "shared_with_groups": [],
+  "only_allow_merge_if_build_succeeds": false
 }
 ```
 
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index 5e8729c5342..aaeb3d4800b 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -90,6 +90,7 @@ module API
       expose :shared_with_groups do |project, options|
         SharedGroup.represent(project.project_group_links.all, options)
       end
+      expose :only_allow_merge_if_build_succeeds
     end
 
     class Member < UserBasic
diff --git a/lib/api/projects.rb b/lib/api/projects.rb
index 60cfc103afd..71efd4f33ca 100644
--- a/lib/api/projects.rb
+++ b/lib/api/projects.rb
@@ -123,7 +123,8 @@ module API
                                      :public,
                                      :visibility_level,
                                      :import_url,
-                                     :public_builds]
+                                     :public_builds,
+                                     :only_allow_merge_if_build_succeeds]
         attrs = map_public_to_visibility_level(attrs)
         @project = ::Projects::CreateService.new(current_user, attrs).execute
         if @project.saved?
@@ -172,7 +173,8 @@ module API
                                      :public,
                                      :visibility_level,
                                      :import_url,
-                                     :public_builds]
+                                     :public_builds,
+                                     :only_allow_merge_if_build_succeeds]
         attrs = map_public_to_visibility_level(attrs)
         @project = ::Projects::CreateService.new(user, attrs).execute
         if @project.saved?
@@ -234,7 +236,8 @@ module API
                                      :shared_runners_enabled,
                                      :public,
                                      :visibility_level,
-                                     :public_builds]
+                                     :public_builds,
+                                     :only_allow_merge_if_build_succeeds]
         attrs = map_public_to_visibility_level(attrs)
         authorize_admin_project
         authorize! :rename_project, user_project if attrs[:name].present?
diff --git a/spec/javascripts/fixtures/projects.json b/spec/javascripts/fixtures/projects.json
index 84e8d0ba1e4..4919d77e5a4 100644
--- a/spec/javascripts/fixtures/projects.json
+++ b/spec/javascripts/fixtures/projects.json
@@ -1 +1 @@
-[{"id":9,"description":"","default_branch":null,"tag_list":[],"public":true,"archived":false,"visibility_level":20,"ssh_url_to_repo":"phil@localhost:root/test.git","http_url_to_repo":"http://localhost:3000/root/test.git","web_url":"http://localhost:3000/root/test","owner":{"name":"Administrator","username":"root","id":1,"state":"active","avatar_url":"http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80\u0026d=identicon","web_url":"http://localhost:3000/u/root"},"name":"test","name_with_namespace":"Administrator / test","path":"test","path_with_namespace":"root/test","issues_enabled":true,"merge_requests_enabled":true,"wiki_enabled":true,"builds_enabled":true,"snippets_enabled":false,"created_at":"2016-01-14T19:08:05.364Z","last_activity_at":"2016-01-14T19:08:07.418Z","shared_runners_enabled":true,"creator_id":1,"namespace":{"id":1,"name":"root","path":"root","owner_id":1,"created_at":"2016-01-13T20:19:44.439Z","updated_at":"2016-01-13T20:19:44.439Z","description":"","avatar":null},"avatar_url":null,"star_count":0,"forks_count":0,"open_issues_count":0,"permissions":{"project_access":null,"group_access":null}},{"id":8,"description":"Voluptatem quae nulla eius numquam ullam voluptatibus quia modi.","default_branch":"master","tag_list":[],"public":false,"archived":false,"visibility_level":0,"ssh_url_to_repo":"phil@localhost:h5bp/html5-boilerplate.git","http_url_to_repo":"http://localhost:3000/h5bp/html5-boilerplate.git","web_url":"http://localhost:3000/h5bp/html5-boilerplate","name":"Html5 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diff --git a/spec/requests/api/projects_spec.rb b/spec/requests/api/projects_spec.rb
index 4742b3d0e37..63f2467be63 100644
--- a/spec/requests/api/projects_spec.rb
+++ b/spec/requests/api/projects_spec.rb
@@ -224,7 +224,8 @@ describe API::API, api: true  do
         description: FFaker::Lorem.sentence,
         issues_enabled: false,
         merge_requests_enabled: false,
-        wiki_enabled: false
+        wiki_enabled: false,
+        only_allow_merge_if_build_succeeds: false
       })
 
       post api('/projects', user), project
@@ -276,6 +277,18 @@ describe API::API, api: true  do
       expect(json_response['visibility_level']).to eq(Gitlab::VisibilityLevel::PRIVATE)
     end
 
+    it 'sets a project as allowing merge even if build fails' do
+      project = attributes_for(:project, { only_allow_merge_if_build_succeeds: false })
+      post api('/projects', user), project
+      expect(json_response['only_allow_merge_if_build_succeeds']).to be_falsey
+    end
+
+    it 'sets a project as allowing merge only if build succeeds' do
+      project = attributes_for(:project, { only_allow_merge_if_build_succeeds: true })
+      post api('/projects', user), project
+      expect(json_response['only_allow_merge_if_build_succeeds']).to be_truthy
+    end
+
     context 'when a visibility level is restricted' do
       before do
         @project = attributes_for(:project, { public: true })
@@ -384,6 +397,18 @@ describe API::API, api: true  do
       expect(json_response['public']).to be_falsey
       expect(json_response['visibility_level']).to eq(Gitlab::VisibilityLevel::PRIVATE)
     end
+
+    it 'sets a project as allowing merge even if build fails' do
+      project = attributes_for(:project, { only_allow_merge_if_build_succeeds: false })
+      post api("/projects/user/#{user.id}", admin), project
+      expect(json_response['only_allow_merge_if_build_succeeds']).to be_falsey
+    end
+
+    it 'sets a project as allowing merge only if build succeeds' do
+      project = attributes_for(:project, { only_allow_merge_if_build_succeeds: true })
+      post api("/projects/user/#{user.id}", admin), project
+      expect(json_response['only_allow_merge_if_build_succeeds']).to be_truthy
+    end
   end
 
   describe "POST /projects/:id/uploads" do
@@ -444,6 +469,7 @@ describe API::API, api: true  do
       expect(json_response['shared_with_groups'][0]['group_id']).to eq(group.id)
       expect(json_response['shared_with_groups'][0]['group_name']).to eq(group.name)
       expect(json_response['shared_with_groups'][0]['group_access_level']).to eq(link.group_access)
+      expect(json_response['only_allow_merge_if_build_succeeds']).to eq(project.only_allow_merge_if_build_succeeds)
     end
 
     it 'returns a project by path name' do