Merge branch '26388-push-to-create-a-new-project' into 'master'

Resolve "Push to create a new project"

Closes #26388

See merge request gitlab-org/gitlab-ce!16547

16 files changed, 581 insertions, 134 deletions

diff --git a/app/controllers/projects/git_http_controller.rb b/app/controllers/projects/git_http_controller.rb
index 71ae60cb8cd..45910a9be44 100644
--- a/app/controllers/projects/git_http_controller.rb
+++ b/app/controllers/projects/git_http_controller.rb
@@ -5,6 +5,7 @@ class Projects::GitHttpController < Projects::GitHttpClientController
 
   rescue_from Gitlab::GitAccess::UnauthorizedError, with: :render_403
   rescue_from Gitlab::GitAccess::NotFoundError, with: :render_404
+  rescue_from Gitlab::GitAccess::ProjectCreationError, with: :render_422
 
   # GET /foo/bar.git/info/refs?service=git-upload-pack (git pull)
   # GET /foo/bar.git/info/refs?service=git-receive-pack (git push)
@@ -55,8 +56,15 @@ class Projects::GitHttpController < Projects::GitHttpClientController
     render plain: exception.message, status: :not_found
   end
 
+  def render_422(exception)
+    render plain: exception.message, status: :unprocessable_entity
+  end
+
   def access
-    @access ||= access_klass.new(access_actor, project, 'http', authentication_abilities: authentication_abilities, redirected_path: redirected_path)
+    @access ||= access_klass.new(access_actor, project,
+      'http', authentication_abilities: authentication_abilities,
+              namespace_path: params[:namespace_id], project_path: project_path,
+              redirected_path: redirected_path)
   end
 
   def access_actor
@@ -68,12 +76,17 @@ class Projects::GitHttpController < Projects::GitHttpClientController
     # Use the magic string '_any' to indicate we do not know what the
     # changes are. This is also what gitlab-shell does.
     access.check(git_command, '_any')
+    @project ||= access.project
   end
 
   def access_klass
     @access_klass ||= wiki? ? Gitlab::GitAccessWiki : Gitlab::GitAccess
   end
 
+  def project_path
+    @project_path ||= params[:project_id].sub(/\.git$/, '')
+  end
+
   def log_user_activity
     Users::ActivityService.new(user, 'pull').execute
   end
diff --git a/changelogs/unreleased/26388-push-to-create-a-new-project.yml b/changelogs/unreleased/26388-push-to-create-a-new-project.yml
new file mode 100644
index 00000000000..f641fcced37
--- /dev/null
+++ b/changelogs/unreleased/26388-push-to-create-a-new-project.yml
@@ -0,0 +1,5 @@
+---
+title: User can now git push to create a new project
+merge_request: 16547
+author:
+type: added
diff --git a/doc/gitlab-basics/create-project.md b/doc/gitlab-basics/create-project.md
index e18711f3392..7b87039da84 100644
--- a/doc/gitlab-basics/create-project.md
+++ b/doc/gitlab-basics/create-project.md
@@ -33,5 +33,40 @@
 
 1. Click **Create project**.
 
+## Push to create a new project
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/issues/26388) in GitLab 10.5.
+
+When you create a new repo locally, instead of going to GitLab to manually
+create a new project and then push the repo, you can directly push it to
+GitLab to create the new project, all without leaving your terminal. If you have access to that
+namespace, we will automatically create a new project under that GitLab namespace with its 
+visibility set to private by default (you can later change it in the UI).
+
+This can be done by using either SSH or HTTP:
+
+```
+## Git push using SSH
+git push git@gitlab.example.com:namespace/nonexistent-project.git
+
+## Git push using HTTP
+git push https://gitlab.example.com/namespace/nonexistent-project.git
+```
+
+Once the push finishes successfully, a remote message will indicate
+the command to set the remote and the URL to the new project:
+
+```
+remote:
+remote: The private project namespace/nonexistent-project was created.
+remote:
+remote: To configure the remote, run:
+remote:   git remote add origin https://gitlab.example.com/namespace/nonexistent-project.git
+remote:
+remote: To view the project, visit:
+remote:   https://gitlab.example.com/namespace/nonexistent-project
+remote:
+```
+
 [import it]: ../workflow/importing/README.md
 [reserved]:  ../user/reserved_names.md
diff --git a/lib/api/helpers/internal_helpers.rb b/lib/api/helpers/internal_helpers.rb
index eb67de81a0d..cd59da6fc70 100644
--- a/lib/api/helpers/internal_helpers.rb
+++ b/lib/api/helpers/internal_helpers.rb
@@ -60,8 +60,20 @@ module API
         false
       end
 
+      def project_path
+        project&.path || project_path_match[:project_path]
+      end
+
+      def namespace_path
+        project&.namespace&.full_path || project_path_match[:namespace_path]
+      end
+
       private
 
+      def project_path_match
+        @project_path_match ||= params[:project].match(Gitlab::PathRegex.full_project_git_path_regex) || {}
+      end
+
       # rubocop:disable Gitlab/ModuleWithInstanceVariables
       def set_project
         if params[:gl_repository]
diff --git a/lib/api/internal.rb b/lib/api/internal.rb
index 063f0d6599c..9285fb90cdc 100644
--- a/lib/api/internal.rb
+++ b/lib/api/internal.rb
@@ -42,11 +42,14 @@ module API
           end
 
         access_checker_klass = wiki? ? Gitlab::GitAccessWiki : Gitlab::GitAccess
-        access_checker = access_checker_klass
-          .new(actor, project, protocol, authentication_abilities: ssh_authentication_abilities, redirected_path: redirected_path)
+        access_checker = access_checker_klass.new(actor, project,
+          protocol, authentication_abilities: ssh_authentication_abilities,
+                    namespace_path: namespace_path, project_path: project_path,
+                    redirected_path: redirected_path)
 
         begin
           access_checker.check(params[:action], params[:changes])
+          @project ||= access_checker.project
         rescue Gitlab::GitAccess::UnauthorizedError, Gitlab::GitAccess::NotFoundError => e
           return { status: false, message: e.message }
         end
@@ -207,8 +210,11 @@ module API
         # A user is not guaranteed to be returned; an orphaned write deploy
         # key could be used
         if user
-          redirect_message = Gitlab::Checks::ProjectMoved.fetch_redirect_message(user.id, project.id)
+          redirect_message = Gitlab::Checks::ProjectMoved.fetch_message(user.id, project.id)
+          project_created_message = Gitlab::Checks::ProjectCreated.fetch_message(user.id, project.id)
+
           output[:redirected_message] = redirect_message if redirect_message
+          output[:project_created_message] = project_created_message if project_created_message
         end
 
         output
diff --git a/lib/gitlab/checks/post_push_message.rb b/lib/gitlab/checks/post_push_message.rb
new file mode 100644
index 00000000000..473c0385b34
--- /dev/null
+++ b/lib/gitlab/checks/post_push_message.rb
@@ -0,0 +1,46 @@
+module Gitlab
+  module Checks
+    class PostPushMessage
+      def initialize(project, user, protocol)
+        @project = project
+        @user = user
+        @protocol = protocol
+      end
+
+      def self.fetch_message(user_id, project_id)
+        key = message_key(user_id, project_id)
+
+        Gitlab::Redis::SharedState.with do |redis|
+          message = redis.get(key)
+          redis.del(key)
+          message
+        end
+      end
+
+      def add_message
+        return unless user.present? && project.present?
+
+        Gitlab::Redis::SharedState.with do |redis|
+          key = self.class.message_key(user.id, project.id)
+          redis.setex(key, 5.minutes, message)
+        end
+      end
+
+      def message
+        raise NotImplementedError
+      end
+
+      protected
+
+      attr_reader :project, :user, :protocol
+
+      def self.message_key(user_id, project_id)
+        raise NotImplementedError
+      end
+
+      def url_to_repo
+        protocol == 'ssh' ? project.ssh_url_to_repo : project.http_url_to_repo
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/checks/project_created.rb b/lib/gitlab/checks/project_created.rb
new file mode 100644
index 00000000000..cec270d6a58
--- /dev/null
+++ b/lib/gitlab/checks/project_created.rb
@@ -0,0 +1,31 @@
+module Gitlab
+  module Checks
+    class ProjectCreated < PostPushMessage
+      PROJECT_CREATED = "project_created".freeze
+
+      def message
+        <<~MESSAGE
+
+        The private project #{project.full_path} was successfully created.
+
+        To configure the remote, run:
+          git remote add origin #{url_to_repo}
+
+        To view the project, visit:
+          #{project_url}
+
+        MESSAGE
+      end
+
+      private
+
+      def self.message_key(user_id, project_id)
+        "#{PROJECT_CREATED}:#{user_id}:#{project_id}"
+      end
+
+      def project_url
+        Gitlab::Routing.url_helpers.project_url(project)
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/checks/project_moved.rb b/lib/gitlab/checks/project_moved.rb
index dfb2f4d4054..3263790a876 100644
--- a/lib/gitlab/checks/project_moved.rb
+++ b/lib/gitlab/checks/project_moved.rb
@@ -1,38 +1,16 @@
 module Gitlab
   module Checks
-    class ProjectMoved
+    class ProjectMoved < PostPushMessage
       REDIRECT_NAMESPACE = "redirect_namespace".freeze
 
-      def initialize(project, user, redirected_path, protocol)
-        @project = project
-        @user = user
+      def initialize(project, user, protocol, redirected_path)
         @redirected_path = redirected_path
-        @protocol = protocol
-      end
-
-      def self.fetch_redirect_message(user_id, project_id)
-        redirect_key = redirect_message_key(user_id, project_id)
 
-        Gitlab::Redis::SharedState.with do |redis|
-          message = redis.get(redirect_key)
-          redis.del(redirect_key)
-          message
-        end
-      end
-
-      def add_redirect_message
-        # Don't bother with sending a redirect message for anonymous clones
-        # because they never see it via the `/internal/post_receive` endpoint
-        return unless user.present? && project.present?
-
-        Gitlab::Redis::SharedState.with do |redis|
-          key = self.class.redirect_message_key(user.id, project.id)
-          redis.setex(key, 5.minutes, redirect_message)
-        end
+        super(project, user, protocol)
       end
 
-      def redirect_message(rejected: false)
-        <<~MESSAGE.strip_heredoc
+      def message(rejected: false)
+        <<~MESSAGE
         Project '#{redirected_path}' was moved to '#{project.full_path}'.
 
         Please update your Git remote:
@@ -47,17 +25,17 @@ module Gitlab
 
       private
 
-      attr_reader :project, :redirected_path, :protocol, :user
+      attr_reader :redirected_path
 
-      def self.redirect_message_key(user_id, project_id)
+      def self.message_key(user_id, project_id)
         "#{REDIRECT_NAMESPACE}:#{user_id}:#{project_id}"
       end
 
       def remote_url_message(rejected)
         if rejected
-          "git remote set-url origin #{url} and try again."
+          "git remote set-url origin #{url_to_repo} and try again."
         else
-          "git remote set-url origin #{url}"
+          "git remote set-url origin #{url_to_repo}"
         end
       end
 
diff --git a/lib/gitlab/git_access.rb b/lib/gitlab/git_access.rb
index 56f6febe86d..8ec3386184a 100644
--- a/lib/gitlab/git_access.rb
+++ b/lib/gitlab/git_access.rb
@@ -2,15 +2,19 @@
 # class return an instance of `GitlabAccessStatus`
 module Gitlab
   class GitAccess
+    include Gitlab::Utils::StrongMemoize
+
     UnauthorizedError = Class.new(StandardError)
     NotFoundError = Class.new(StandardError)
+    ProjectCreationError = Class.new(StandardError)
     ProjectMovedError = Class.new(NotFoundError)
 
     ERROR_MESSAGES = {
       upload: 'You are not allowed to upload code for this project.',
       download: 'You are not allowed to download code from this project.',
-      deploy_key_upload:
-        'This deploy key does not have write access to this project.',
+      auth_upload: 'You are not allowed to upload code.',
+      auth_download: 'You are not allowed to download code.',
+      deploy_key_upload: 'This deploy key does not have write access to this project.',
       no_repo: 'A repository for this project does not exist yet.',
       project_not_found: 'The project you were looking for could not be found.',
       account_blocked: 'Your account has been blocked.',
@@ -25,24 +29,31 @@ module Gitlab
     PUSH_COMMANDS = %w{ git-receive-pack }.freeze
     ALL_COMMANDS = DOWNLOAD_COMMANDS + PUSH_COMMANDS
 
-    attr_reader :actor, :project, :protocol, :authentication_abilities, :redirected_path
+    attr_reader :actor, :project, :protocol, :authentication_abilities, :namespace_path, :project_path, :redirected_path
 
-    def initialize(actor, project, protocol, authentication_abilities:, redirected_path: nil)
+    def initialize(actor, project, protocol, authentication_abilities:, namespace_path: nil, project_path: nil, redirected_path: nil)
       @actor    = actor
       @project  = project
       @protocol = protocol
-      @redirected_path = redirected_path
       @authentication_abilities = authentication_abilities
+      @namespace_path = namespace_path
+      @project_path = project_path
+      @redirected_path = redirected_path
     end
 
     def check(cmd, changes)
       check_protocol!
       check_valid_actor!
       check_active_user!
-      check_project_accessibility!
-      check_project_moved!
+      check_authentication_abilities!(cmd)
       check_command_disabled!(cmd)
       check_command_existence!(cmd)
+      check_db_accessibility!(cmd)
+
+      ensure_project_on_push!(cmd, changes)
+
+      check_project_accessibility!
+      check_project_moved!
       check_repository_existence!
 
       case cmd
@@ -95,6 +106,19 @@ module Gitlab
       end
     end
 
+    def check_authentication_abilities!(cmd)
+      case cmd
+      when *DOWNLOAD_COMMANDS
+        unless authentication_abilities.include?(:download_code) || authentication_abilities.include?(:build_download_code)
+          raise UnauthorizedError, ERROR_MESSAGES[:auth_download]
+        end
+      when *PUSH_COMMANDS
+        unless authentication_abilities.include?(:push_code)
+          raise UnauthorizedError, ERROR_MESSAGES[:auth_upload]
+        end
+      end
+    end
+
     def check_project_accessibility!
       if project.blank? || !can_read_project?
         raise NotFoundError, ERROR_MESSAGES[:project_not_found]
@@ -104,12 +128,12 @@ module Gitlab
     def check_project_moved!
       return if redirected_path.nil?
 
-      project_moved = Checks::ProjectMoved.new(project, user, redirected_path, protocol)
+      project_moved = Checks::ProjectMoved.new(project, user, protocol, redirected_path)
 
       if project_moved.permanent_redirect?
-        project_moved.add_redirect_message
+        project_moved.add_message
       else
-        raise ProjectMovedError, project_moved.redirect_message(rejected: true)
+        raise ProjectMovedError, project_moved.message(rejected: true)
       end
     end
 
@@ -139,6 +163,40 @@ module Gitlab
       end
     end
 
+    def check_db_accessibility!(cmd)
+      return unless receive_pack?(cmd)
+
+      if Gitlab::Database.read_only?
+        raise UnauthorizedError, push_to_read_only_message
+      end
+    end
+
+    def ensure_project_on_push!(cmd, changes)
+      return if project || deploy_key?
+      return unless receive_pack?(cmd) && changes == '_any' && authentication_abilities.include?(:push_code)
+
+      namespace = Namespace.find_by_full_path(namespace_path)
+
+      return unless user&.can?(:create_projects, namespace)
+
+      project_params = {
+        path: project_path,
+        namespace_id: namespace.id,
+        visibility_level: Gitlab::VisibilityLevel::PRIVATE
+      }
+
+      project = Projects::CreateService.new(user, project_params).execute
+
+      unless project.saved?
+        raise ProjectCreationError, "Could not create project: #{project.errors.full_messages.join(', ')}"
+      end
+
+      @project = project
+      user_access.project = @project
+
+      Checks::ProjectCreated.new(project, user, protocol).add_message
+    end
+
     def check_repository_existence!
       unless project.repository.exists?
         raise UnauthorizedError, ERROR_MESSAGES[:no_repo]
@@ -146,9 +204,8 @@ module Gitlab
     end
 
     def check_download_access!
-      return if deploy_key?
-
-      passed = user_can_download_code? ||
+      passed = deploy_key? ||
+        user_can_download_code? ||
         build_can_download_code? ||
         guest_can_download_code?
 
@@ -162,35 +219,21 @@ module Gitlab
         raise UnauthorizedError, ERROR_MESSAGES[:read_only]
       end
 
-      if Gitlab::Database.read_only?
-        raise UnauthorizedError, push_to_read_only_message
-      end
-
       if deploy_key
-        check_deploy_key_push_access!
+        unless deploy_key.can_push_to?(project)
+          raise UnauthorizedError, ERROR_MESSAGES[:deploy_key_upload]
+        end
       elsif user
-        check_user_push_access!
+        # User access is verified in check_change_access!
       else
         raise UnauthorizedError, ERROR_MESSAGES[:upload]
       end
 
-      return if changes.blank? # Allow access.
+      return if changes.blank? # Allow access this is needed for EE.
 
       check_change_access!(changes)
     end
 
-    def check_user_push_access!
-      unless authentication_abilities.include?(:push_code)
-        raise UnauthorizedError, ERROR_MESSAGES[:upload]
-      end
-    end
-
-    def check_deploy_key_push_access!
-      unless deploy_key.can_push_to?(project)
-        raise UnauthorizedError, ERROR_MESSAGES[:deploy_key_upload]
-      end
-    end
-
     def check_change_access!(changes)
       changes_list = Gitlab::ChangesList.new(changes)
 
diff --git a/lib/gitlab/path_regex.rb b/lib/gitlab/path_regex.rb
index ef3f786686a..4dc38aae61e 100644
--- a/lib/gitlab/path_regex.rb
+++ b/lib/gitlab/path_regex.rb
@@ -179,6 +179,10 @@ module Gitlab
       @full_project_path_regex ||= %r{\A#{full_namespace_route_regex}/#{project_route_regex}/\z}
     end
 
+    def full_project_git_path_regex
+      @full_project_git_path_regex ||= %r{\A\/?(?<namespace_path>#{full_namespace_route_regex})\/(?<project_path>#{project_route_regex})\.git\z}
+    end
+
     def namespace_format_regex
       @namespace_format_regex ||= /\A#{NAMESPACE_FORMAT_REGEX}\z/.freeze
     end
diff --git a/lib/gitlab/user_access.rb b/lib/gitlab/user_access.rb
index f357488ac61..15eb1c41213 100644
--- a/lib/gitlab/user_access.rb
+++ b/lib/gitlab/user_access.rb
@@ -6,7 +6,8 @@ module Gitlab
       [user&.id, project&.id]
     end
 
-    attr_reader :user, :project
+    attr_reader :user
+    attr_accessor :project
 
     def initialize(user, project: nil)
       @user = user
diff --git a/spec/lib/gitlab/checks/project_created_spec.rb b/spec/lib/gitlab/checks/project_created_spec.rb
new file mode 100644
index 00000000000..ac02007e111
--- /dev/null
+++ b/spec/lib/gitlab/checks/project_created_spec.rb
@@ -0,0 +1,46 @@
+require 'rails_helper'
+
+describe Gitlab::Checks::ProjectCreated, :clean_gitlab_redis_shared_state do
+  let(:user) { create(:user) }
+  let(:project) { create(:project) }
+
+  describe '.fetch_message' do
+    context 'with a project created message queue' do
+      let(:project_created) { described_class.new(project, user, 'http') }
+
+      before do
+        project_created.add_message
+      end
+
+      it 'returns project created message' do
+        expect(described_class.fetch_message(user.id, project.id)).to eq(project_created.message)
+      end
+
+      it 'deletes the project created message from redis' do
+        expect(Gitlab::Redis::SharedState.with { |redis| redis.get("project_created:#{user.id}:#{project.id}") }).not_to be_nil
+        described_class.fetch_message(user.id, project.id)
+        expect(Gitlab::Redis::SharedState.with { |redis| redis.get("project_created:#{user.id}:#{project.id}") }).to be_nil
+      end
+    end
+
+    context 'with no project created message queue' do
+      it 'returns nil' do
+        expect(described_class.fetch_message(1, 2)).to be_nil
+      end
+    end
+  end
+
+  describe '#add_message' do
+    it 'queues a project created message' do
+      project_created = described_class.new(project, user, 'http')
+
+      expect(project_created.add_message).to eq('OK')
+    end
+
+    it 'handles anonymous push' do
+      project_created = described_class.new(nil, user, 'http')
+
+      expect(project_created.add_message).to be_nil
+    end
+  end
+end
diff --git a/spec/lib/gitlab/checks/project_moved_spec.rb b/spec/lib/gitlab/checks/project_moved_spec.rb
index f90c2d6aded..e263d29656c 100644
--- a/spec/lib/gitlab/checks/project_moved_spec.rb
+++ b/spec/lib/gitlab/checks/project_moved_spec.rb
@@ -4,82 +4,82 @@ describe Gitlab::Checks::ProjectMoved, :clean_gitlab_redis_shared_state do
   let(:user) { create(:user) }
   let(:project) { create(:project) }
 
-  describe '.fetch_redirct_message' do
+  describe '.fetch_message' do
     context 'with a redirect message queue' do
-      it 'should return the redirect message' do
-        project_moved = described_class.new(project, user, 'foo/bar', 'http')
-        project_moved.add_redirect_message
+      it 'returns the redirect message' do
+        project_moved = described_class.new(project, user, 'http', 'foo/bar')
+        project_moved.add_message
 
-        expect(described_class.fetch_redirect_message(user.id, project.id)).to eq(project_moved.redirect_message)
+        expect(described_class.fetch_message(user.id, project.id)).to eq(project_moved.message)
       end
 
-      it 'should delete the redirect message from redis' do
-        project_moved = described_class.new(project, user, 'foo/bar', 'http')
-        project_moved.add_redirect_message
+      it 'deletes the redirect message from redis' do
+        project_moved = described_class.new(project, user, 'http', 'foo/bar')
+        project_moved.add_message
 
         expect(Gitlab::Redis::SharedState.with { |redis| redis.get("redirect_namespace:#{user.id}:#{project.id}") }).not_to be_nil
-        described_class.fetch_redirect_message(user.id, project.id)
+        described_class.fetch_message(user.id, project.id)
         expect(Gitlab::Redis::SharedState.with { |redis| redis.get("redirect_namespace:#{user.id}:#{project.id}") }).to be_nil
       end
     end
 
     context 'with no redirect message queue' do
-      it 'should return nil' do
-        expect(described_class.fetch_redirect_message(1, 2)).to be_nil
+      it 'returns nil' do
+        expect(described_class.fetch_message(1, 2)).to be_nil
       end
     end
   end
 
-  describe '#add_redirect_message' do
-    it 'should queue a redirect message' do
-      project_moved = described_class.new(project, user, 'foo/bar', 'http')
-      expect(project_moved.add_redirect_message).to eq("OK")
+  describe '#add_message' do
+    it 'queues a redirect message' do
+      project_moved = described_class.new(project, user, 'http', 'foo/bar')
+      expect(project_moved.add_message).to eq("OK")
     end
 
-    it 'should handle anonymous clones' do
-      project_moved = described_class.new(project, nil, 'foo/bar', 'http')
+    it 'handles anonymous clones' do
+      project_moved = described_class.new(project, nil, 'http', 'foo/bar')
 
-      expect(project_moved.add_redirect_message).to eq(nil)
+      expect(project_moved.add_message).to eq(nil)
     end
   end
 
-  describe '#redirect_message' do
+  describe '#message' do
     context 'when the push is rejected' do
-      it 'should return a redirect message telling the user to try again' do
-        project_moved = described_class.new(project, user, 'foo/bar', 'http')
+      it 'returns a redirect message telling the user to try again' do
+        project_moved = described_class.new(project, user, 'http', 'foo/bar')
         message = "Project 'foo/bar' was moved to '#{project.full_path}'." +
           "\n\nPlease update your Git remote:" +
           "\n\n  git remote set-url origin #{project.http_url_to_repo} and try again.\n"
 
-        expect(project_moved.redirect_message(rejected: true)).to eq(message)
+        expect(project_moved.message(rejected: true)).to eq(message)
       end
     end
 
     context 'when the push is not rejected' do
-      it 'should return a redirect message' do
-        project_moved = described_class.new(project, user, 'foo/bar', 'http')
+      it 'returns a redirect message' do
+        project_moved = described_class.new(project, user, 'http', 'foo/bar')
         message = "Project 'foo/bar' was moved to '#{project.full_path}'." +
           "\n\nPlease update your Git remote:" +
           "\n\n  git remote set-url origin #{project.http_url_to_repo}\n"
 
-        expect(project_moved.redirect_message).to eq(message)
+        expect(project_moved.message).to eq(message)
       end
     end
   end
 
   describe '#permanent_redirect?' do
     context 'with a permanent RedirectRoute' do
-      it 'should return true' do
+      it 'returns true' do
         project.route.create_redirect('foo/bar', permanent: true)
-        project_moved = described_class.new(project, user, 'foo/bar', 'http')
+        project_moved = described_class.new(project, user, 'http', 'foo/bar')
         expect(project_moved.permanent_redirect?).to be_truthy
       end
     end
 
     context 'without a permanent RedirectRoute' do
-      it 'should return false' do
+      it 'returns false' do
         project.route.create_redirect('foo/bar')
-        project_moved = described_class.new(project, user, 'foo/bar', 'http')
+        project_moved = described_class.new(project, user, 'http', 'foo/bar')
         expect(project_moved.permanent_redirect?).to be_falsy
       end
     end
diff --git a/spec/lib/gitlab/git_access_spec.rb b/spec/lib/gitlab/git_access_spec.rb
index 2009a8ac48c..3c3697e7aa9 100644
--- a/spec/lib/gitlab/git_access_spec.rb
+++ b/spec/lib/gitlab/git_access_spec.rb
@@ -5,11 +5,19 @@ describe Gitlab::GitAccess do
 
   let(:actor) { user }
   let(:project) { create(:project, :repository) }
+  let(:project_path) { project.path }
+  let(:namespace_path) { project&.namespace&.path }
   let(:protocol) { 'ssh' }
   let(:authentication_abilities) { %i[read_project download_code push_code] }
   let(:redirected_path) { nil }
 
-  let(:access) { described_class.new(actor, project, protocol, authentication_abilities: authentication_abilities, redirected_path: redirected_path) }
+  let(:access) do
+    described_class.new(actor, project,
+      protocol, authentication_abilities: authentication_abilities,
+                namespace_path: namespace_path, project_path: project_path,
+                redirected_path: redirected_path)
+  end
+
   let(:push_access_check) { access.check('git-receive-pack', '_any') }
   let(:pull_access_check) { access.check('git-upload-pack', '_any') }
 
@@ -111,7 +119,7 @@ describe Gitlab::GitAccess do
           end
 
           it 'does not block pushes with "not found"' do
-            expect { push_access_check }.to raise_unauthorized(described_class::ERROR_MESSAGES[:upload])
+            expect { push_access_check }.to raise_unauthorized(described_class::ERROR_MESSAGES[:auth_upload])
           end
         end
       end
@@ -145,6 +153,7 @@ describe Gitlab::GitAccess do
 
     context 'when the project is nil' do
       let(:project) { nil }
+      let(:project_path) { "new-project" }
 
       it 'blocks push and pull with "not found"' do
         aggregate_failures do
@@ -152,6 +161,42 @@ describe Gitlab::GitAccess do
           expect { push_access_check }.to raise_not_found
         end
       end
+
+      context 'when user is allowed to create project in namespace' do
+        let(:namespace_path) { user.namespace.path }
+        let(:access) do
+          described_class.new(actor, nil,
+            protocol, authentication_abilities: authentication_abilities,
+                      project_path: project_path, namespace_path: namespace_path,
+                      redirected_path: redirected_path)
+        end
+
+        it 'blocks pull access with "not found"' do
+          expect { pull_access_check }.to raise_not_found
+        end
+
+        it 'allows push access' do
+          expect { push_access_check }.not_to raise_error
+        end
+      end
+
+      context 'when user is not allowed to create project in namespace' do
+        let(:user2) { create(:user) }
+        let(:namespace_path) { user2.namespace.path }
+        let(:access) do
+          described_class.new(actor, nil,
+            protocol, authentication_abilities: authentication_abilities,
+                      project_path: project_path, namespace_path: namespace_path,
+                      redirected_path: redirected_path)
+        end
+
+        it 'blocks push and pull with "not found"' do
+          aggregate_failures do
+            expect { pull_access_check }.to raise_not_found
+            expect { push_access_check }.to raise_not_found
+          end
+        end
+      end
     end
   end
 
@@ -197,7 +242,7 @@ describe Gitlab::GitAccess do
     it 'enqueues a redirected message' do
       push_access_check
 
-      expect(Gitlab::Checks::ProjectMoved.fetch_redirect_message(user.id, project.id)).not_to be_nil
+      expect(Gitlab::Checks::ProjectMoved.fetch_message(user.id, project.id)).not_to be_nil
     end
   end
 
@@ -273,6 +318,52 @@ describe Gitlab::GitAccess do
     end
   end
 
+  describe '#check_authentication_abilities!' do
+    before do
+      project.add_master(user)
+    end
+
+    context 'when download' do
+      let(:authentication_abilities) { [] }
+
+      it 'raises unauthorized with download error' do
+        expect { pull_access_check }.to raise_unauthorized(described_class::ERROR_MESSAGES[:auth_download])
+      end
+
+      context 'when authentication abilities include download code' do
+        let(:authentication_abilities) { [:download_code] }
+
+        it 'does not raise any errors' do
+          expect { pull_access_check }.not_to raise_error
+        end
+      end
+
+      context 'when authentication abilities include build download code' do
+        let(:authentication_abilities) { [:build_download_code] }
+
+        it 'does not raise any errors' do
+          expect { pull_access_check }.not_to raise_error
+        end
+      end
+    end
+
+    context 'when upload' do
+      let(:authentication_abilities) { [] }
+
+      it 'raises unauthorized with push error' do
+        expect { push_access_check }.to raise_unauthorized(described_class::ERROR_MESSAGES[:auth_upload])
+      end
+
+      context 'when authentication abilities include push code' do
+        let(:authentication_abilities) { [:push_code] }
+
+        it 'does not raise any errors' do
+          expect { push_access_check }.not_to raise_error
+        end
+      end
+    end
+  end
+
   describe '#check_command_disabled!' do
     before do
       project.add_master(user)
@@ -311,6 +402,117 @@ describe Gitlab::GitAccess do
     end
   end
 
+  describe '#check_db_accessibility!' do
+    context 'when in a read-only GitLab instance' do
+      before do
+        create(:protected_branch, name: 'feature', project: project)
+        allow(Gitlab::Database).to receive(:read_only?) { true }
+      end
+
+      it { expect { push_access_check }.to raise_unauthorized(described_class::ERROR_MESSAGES[:cannot_push_to_read_only]) }
+    end
+  end
+
+  describe '#ensure_project_on_push!' do
+    let(:access) do
+      described_class.new(actor, project,
+        protocol, authentication_abilities: authentication_abilities,
+                  project_path: project_path, namespace_path: namespace_path,
+                  redirected_path: redirected_path)
+    end
+
+    context 'when push' do
+      let(:cmd) { 'git-receive-pack' }
+
+      context 'when project does not exist' do
+        let(:project_path) { "nonexistent" }
+        let(:project) { nil }
+
+        context 'when changes is _any' do
+          let(:changes) { '_any' }
+
+          context 'when authentication abilities include push code' do
+            let(:authentication_abilities) { [:push_code] }
+
+            context 'when user can create project in namespace' do
+              let(:namespace_path) { user.namespace.path }
+
+              it 'creates a new project' do
+                expect { access.send(:ensure_project_on_push!, cmd, changes) }.to change { Project.count }.by(1)
+              end
+            end
+
+            context 'when user cannot create project in namespace' do
+              let(:user2) { create(:user) }
+              let(:namespace_path) { user2.namespace.path }
+
+              it 'does not create a new project' do
+                expect { access.send(:ensure_project_on_push!, cmd, changes) }.not_to change { Project.count }
+              end
+            end
+          end
+
+          context 'when authentication abilities do not include push code' do
+            let(:authentication_abilities) { [] }
+
+            context 'when user can create project in namespace' do
+              let(:namespace_path) { user.namespace.path }
+
+              it 'does not create a new project' do
+                expect { access.send(:ensure_project_on_push!, cmd, changes) }.not_to change { Project.count }
+              end
+            end
+          end
+        end
+
+        context 'when check contains actual changes' do
+          let(:changes) { "#{Gitlab::Git::BLANK_SHA} 570e7b2abdd848b95f2f578043fc23bd6f6fd24d refs/heads/new_branch" }
+
+          it 'does not create a new project' do
+            expect { access.send(:ensure_project_on_push!, cmd, changes) }.not_to change { Project.count }
+          end
+        end
+      end
+
+      context 'when project exists' do
+        let(:changes) { '_any' }
+        let!(:project) { create(:project) }
+
+        it 'does not create a new project' do
+          expect { access.send(:ensure_project_on_push!, cmd, changes) }.not_to change { Project.count }
+        end
+      end
+
+      context 'when deploy key is used' do
+        let(:key) { create(:deploy_key, user: user) }
+        let(:actor) { key }
+        let(:project_path) { "nonexistent" }
+        let(:project) { nil }
+        let(:namespace_path) { user.namespace.path }
+        let(:changes) { '_any' }
+
+        it 'does not create a new project' do
+          expect { access.send(:ensure_project_on_push!, cmd, changes) }.not_to change { Project.count }
+        end
+      end
+    end
+
+    context 'when pull' do
+      let(:cmd) { 'git-upload-pack' }
+      let(:changes) { '_any' }
+
+      context 'when project does not exist' do
+        let(:project_path) { "new-project" }
+        let(:namespace_path) { user.namespace.path }
+        let(:project) { nil }
+
+        it 'does not create a new project' do
+          expect { access.send(:ensure_project_on_push!, cmd, changes) }.not_to change { Project.count }
+        end
+      end
+    end
+  end
+
   describe '#check_download_access!' do
     it 'allows masters to pull' do
       project.add_master(user)
@@ -338,7 +540,9 @@ describe Gitlab::GitAccess do
 
       context 'when project is public' do
         let(:public_project) { create(:project, :public, :repository) }
-        let(:access) { described_class.new(nil, public_project, 'web', authentication_abilities: []) }
+        let(:project_path) { public_project.path }
+        let(:namespace_path) { public_project.namespace.path }
+        let(:access) { described_class.new(nil, public_project, 'web', authentication_abilities: [:download_code], project_path: project_path, namespace_path: namespace_path) }
 
         context 'when repository is enabled' do
           it 'give access to download code' do
@@ -638,19 +842,6 @@ describe Gitlab::GitAccess do
                                                             admin: { push_protected_branch: false, push_all: false, merge_into_protected_branch: false }))
       end
     end
-
-    context "when in a read-only GitLab instance" do
-      before do
-        create(:protected_branch, name: 'feature', project: project)
-        allow(Gitlab::Database).to receive(:read_only?) { true }
-      end
-
-      # Only check admin; if an admin can't do it, other roles can't either
-      matrix = permissions_matrix[:admin].dup
-      matrix.each { |key, _| matrix[key] = false }
-
-      run_permission_checks(admin: matrix)
-    end
   end
 
   describe 'build authentication abilities' do
@@ -661,26 +852,26 @@ describe Gitlab::GitAccess do
         project.add_reporter(user)
       end
 
-      it { expect { push_access_check }.to raise_unauthorized(described_class::ERROR_MESSAGES[:upload]) }
+      it { expect { push_access_check }.to raise_unauthorized(described_class::ERROR_MESSAGES[:auth_upload]) }
     end
 
     context 'when unauthorized' do
       context 'to public project' do
         let(:project) { create(:project, :public, :repository) }
 
-        it { expect { push_access_check }.to raise_unauthorized(described_class::ERROR_MESSAGES[:upload]) }
+        it { expect { push_access_check }.to raise_unauthorized(described_class::ERROR_MESSAGES[:auth_upload]) }
       end
 
       context 'to internal project' do
         let(:project) { create(:project, :internal, :repository) }
 
-        it { expect { push_access_check }.to raise_unauthorized(described_class::ERROR_MESSAGES[:upload]) }
+        it { expect { push_access_check }.to raise_unauthorized(described_class::ERROR_MESSAGES[:auth_upload]) }
       end
 
       context 'to private project' do
         let(:project) { create(:project, :private, :repository) }
 
-        it { expect { push_access_check }.to raise_not_found }
+        it { expect { push_access_check }.to raise_unauthorized(described_class::ERROR_MESSAGES[:auth_upload]) }
       end
     end
   end
@@ -767,8 +958,7 @@ describe Gitlab::GitAccess do
   end
 
   def raise_not_found
-    raise_error(Gitlab::GitAccess::NotFoundError,
-                Gitlab::GitAccess::ERROR_MESSAGES[:project_not_found])
+    raise_error(Gitlab::GitAccess::NotFoundError, Gitlab::GitAccess::ERROR_MESSAGES[:project_not_found])
   end
 
   def build_authentication_abilities
diff --git a/spec/requests/api/internal_spec.rb b/spec/requests/api/internal_spec.rb
index 884a258fd12..ea6b0a71849 100644
--- a/spec/requests/api/internal_spec.rb
+++ b/spec/requests/api/internal_spec.rb
@@ -368,7 +368,7 @@ describe API::Internal do
 
         context 'project as /namespace/project' do
           it do
-            pull(key, project_with_repo_path('/' + project.full_path))
+            push(key, project_with_repo_path('/' + project.full_path))
 
             expect(response).to have_gitlab_http_status(200)
             expect(json_response["status"]).to be_truthy
@@ -379,7 +379,7 @@ describe API::Internal do
 
         context 'project as namespace/project' do
           it do
-            pull(key, project_with_repo_path(project.full_path))
+            push(key, project_with_repo_path(project.full_path))
 
             expect(response).to have_gitlab_http_status(200)
             expect(json_response["status"]).to be_truthy
@@ -807,14 +807,27 @@ describe API::Internal do
 
     context 'with a redirected data' do
       it 'returns redirected message on the response' do
-        project_moved = Gitlab::Checks::ProjectMoved.new(project, user, 'foo/baz', 'http')
-        project_moved.add_redirect_message
+        project_moved = Gitlab::Checks::ProjectMoved.new(project, user, 'http', 'foo/baz')
+        project_moved.add_message
 
         post api("/internal/post_receive"), valid_params
 
         expect(response).to have_gitlab_http_status(200)
         expect(json_response["redirected_message"]).to be_present
-        expect(json_response["redirected_message"]).to eq(project_moved.redirect_message)
+        expect(json_response["redirected_message"]).to eq(project_moved.message)
+      end
+    end
+
+    context 'with new project data' do
+      it 'returns new project message on the response' do
+        project_created = Gitlab::Checks::ProjectCreated.new(project, user, 'http')
+        project_created.add_message
+
+        post api("/internal/post_receive"), valid_params
+
+        expect(response).to have_gitlab_http_status(200)
+        expect(json_response["project_created_message"]).to be_present
+        expect(json_response["project_created_message"]).to eq(project_created.message)
       end
     end
 
diff --git a/spec/requests/git_http_spec.rb b/spec/requests/git_http_spec.rb
index 27bd22d6bca..2e2dccdafad 100644
--- a/spec/requests/git_http_spec.rb
+++ b/spec/requests/git_http_spec.rb
@@ -107,15 +107,39 @@ describe 'Git HTTP requests' do
     let(:user) { create(:user) }
 
     context "when the project doesn't exist" do
-      let(:path) { 'doesnt/exist.git' }
+      context "when namespace doesn't exist" do
+        let(:path) { 'doesnt/exist.git' }
 
-      it_behaves_like 'pulls require Basic HTTP Authentication'
-      it_behaves_like 'pushes require Basic HTTP Authentication'
+        it_behaves_like 'pulls require Basic HTTP Authentication'
+        it_behaves_like 'pushes require Basic HTTP Authentication'
 
-      context 'when authenticated' do
-        it 'rejects downloads and uploads with 404 Not Found' do
-          download_or_upload(path, user: user.username, password: user.password) do |response|
-            expect(response).to have_gitlab_http_status(:not_found)
+        context 'when authenticated' do
+          it 'rejects downloads and uploads with 404 Not Found' do
+            download_or_upload(path, user: user.username, password: user.password) do |response|
+              expect(response).to have_gitlab_http_status(:not_found)
+            end
+          end
+        end
+      end
+
+      context 'when namespace exists' do
+        let(:path) { "#{user.namespace.path}/new-project.git"}
+
+        context 'when authenticated' do
+          it 'creates a new project under the existing namespace' do
+            expect do
+              upload(path, user: user.username, password: user.password) do |response|
+                expect(response).to have_gitlab_http_status(:ok)
+              end
+            end.to change { user.projects.count }.by(1)
+          end
+
+          it 'rejects push with 422 Unprocessable Entity when project is invalid' do
+            path = "#{user.namespace.path}/new.git"
+
+            push_get(path, user: user.username, password: user.password)
+
+            expect(response).to have_gitlab_http_status(:unprocessable_entity)
           end
         end
       end
@@ -596,7 +620,7 @@ describe 'Git HTTP requests' do
               push_get(path, env)
 
               expect(response).to have_gitlab_http_status(:forbidden)
-              expect(response.body).to eq(git_access_error(:upload))
+              expect(response.body).to eq(git_access_error(:auth_upload))
             end
 
             # We are "authenticated" as CI using a valid token here. But we are
@@ -636,7 +660,7 @@ describe 'Git HTTP requests' do
                 push_get path, env
 
                 expect(response).to have_gitlab_http_status(:forbidden)
-                expect(response.body).to eq(git_access_error(:upload))
+                expect(response.body).to eq(git_access_error(:auth_upload))
               end
             end