[Backported from EE] Readonly flag for Projects

This is used in EE for the storage migration, and we want to use this
in CE as well to be able to migrate projects to hashed_storage.

db/migrate/20160713200638_add_repository_read_only_to_projects.rb

+class AddRepositoryReadOnlyToProjects < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def change
+    add_column :projects, :repository_read_only, :boolean
+  end
+end

db/schema.rb

@@ -1215,6 +1215,7 @@ ActiveRecord::Schema.define(version: 20170921115009) do
     t.datetime "last_repository_updated_at"
     t.integer "storage_version", limit: 2
     t.boolean "resolve_outdated_diff_discussions"
+    t.boolean "repository_read_only"
   end
 
   add_index "projects", ["ci_id"], name: "index_projects_on_ci_id", using: :btree

lib/gitlab/git_access.rb

@@ -16,7 +16,8 @@ module Gitlab
       account_blocked: 'Your account has been blocked.',
       command_not_allowed: "The command you're trying to execute is not allowed.",
       upload_pack_disabled_over_http: 'Pulling over HTTP is not allowed.',
-      receive_pack_disabled_over_http: 'Pushing over HTTP is not allowed.'
+      receive_pack_disabled_over_http: 'Pushing over HTTP is not allowed.',
+      readonly: 'The repository is temporarily read-only. Please try again later.'
     }.freeze
 
     DOWNLOAD_COMMANDS = %w{ git-upload-pack git-upload-archive }.freeze
@@ -159,6 +160,10 @@ module Gitlab
     end
 
     def check_push_access!(changes)
+      if project.repository_read_only?
+        raise UnauthorizedError, ERROR_MESSAGES[:readonly]
+      end
+
       if deploy_key
         check_deploy_key_push_access!
       elsif user

spec/factories/projects.rb

@@ -143,6 +143,10 @@ FactoryGirl.define do
       end
     end
 
+    trait :read_only_repository do
+      repository_read_only true
+    end
+
     trait :broken_repo do
       after(:create) do |project|
         raise "Failed to create repository!" unless project.create_repository

spec/lib/gitlab/shell_spec.rb

@@ -48,6 +48,26 @@ describe Gitlab::Shell do
     end
   end
 
+  describe 'projects commands' do
+    let(:gitlab_shell_path) { File.expand_path('tmp/tests/gitlab-shell') }
+    let(:projects_path) { File.join(gitlab_shell_path, 'bin/gitlab-projects') }
+    let(:gitlab_shell_hooks_path) { File.join(gitlab_shell_path, 'hooks') }
+
+    before do
+      allow(Gitlab.config.gitlab_shell).to receive(:path).and_return(gitlab_shell_path)
+      allow(Gitlab.config.gitlab_shell).to receive(:hooks_path).and_return(gitlab_shell_hooks_path)
+      allow(Gitlab.config.gitlab_shell).to receive(:git_timeout).and_return(800)
+    end
+
+    describe '#mv_repository' do
+      it 'executes the command' do
+        expect(gitlab_shell).to receive(:gitlab_shell_fast_execute).with(
+          [projects_path, 'mv-project', 'storage/path', 'project/path.git', 'new/path.git']
+        )
+        gitlab_shell.mv_repository('storage/path', 'project/path', 'new/path')
+      end
+    end
+
     describe '#add_key' do
       it 'removes trailing garbage' do
         allow(gitlab_shell).to receive(:gitlab_shell_keys_path).and_return(:gitlab_shell_keys_path)
@@ -58,6 +78,7 @@ describe Gitlab::Shell do
         gitlab_shell.add_key('key-123', 'ssh-rsa foobar trailing garbage')
       end
     end
+  end
 
   describe Gitlab::Shell::KeyAdder do
     describe '#add_key' do