summaryrefslogtreecommitdiff
path: root/app/services/merge_requests/refresh_service.rb
blob: 262622f8bd0b78692ed8dc179dd9b6ee99a60d99 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
module MergeRequests
  class RefreshService < MergeRequests::BaseService
    def execute(oldrev, newrev, ref)
      return true unless Gitlab::Git.branch_ref?(ref)

      @oldrev, @newrev = oldrev, newrev
      @branch_name = Gitlab::Git.ref_name(ref)

      Gitlab::GitalyClient.allow_n_plus_1_calls(&method(:find_new_commits))
      # Be sure to close outstanding MRs before reloading them to avoid generating an
      # empty diff during a manual merge
      close_upon_missing_source_branch_ref
      post_merge_manually_merged
      reload_merge_requests
      reset_merge_when_pipeline_succeeds
      mark_pending_todos_done
      cache_merge_requests_closing_issues

      # Leave a system note if a branch was deleted/added
      if branch_added? || branch_removed?
        comment_mr_branch_presence_changed
      end

      comment_mr_with_commits
      mark_mr_as_wip_from_commits
      execute_mr_web_hooks

      true
    end

    private

    def close_upon_missing_source_branch_ref
      # MergeRequest#reload_diff ignores not opened MRs. This means it won't
      # create an `empty` diff for `closed` MRs without a source branch, keeping
      # the latest diff state as the last _valid_ one.
      merge_requests_for_source_branch.reject(&:source_branch_exists?).each do |mr|
        MergeRequests::CloseService
          .new(mr.target_project, @current_user)
          .execute(mr)
      end
    end

    # Collect open merge requests that target same branch we push into
    # and close if push to master include last commit from merge request
    # We need this to close(as merged) merge requests that were merged into
    # target branch manually
    def post_merge_manually_merged
      commit_ids = @commits.map(&:id)
      merge_requests = @project.merge_requests.preload(:latest_merge_request_diff).opened.where(target_branch: @branch_name).to_a
      merge_requests = merge_requests.select(&:diff_head_commit)

      merge_requests = merge_requests.select do |merge_request|
        commit_ids.include?(merge_request.diff_head_sha) &&
          merge_request.merge_request_diff.state != 'empty'
      end

      filter_merge_requests(merge_requests).each do |merge_request|
        MergeRequests::PostMergeService
          .new(merge_request.target_project, @current_user)
          .execute(merge_request)
      end
    end

    def force_push?
      Gitlab::Checks::ForcePush.force_push?(@project, @oldrev, @newrev)
    end

    # Refresh merge request diff if we push to source or target branch of merge request
    # Note: we should update merge requests from forks too
    def reload_merge_requests
      merge_requests = @project.merge_requests.opened
        .by_source_or_target_branch(@branch_name).to_a

      # Fork merge requests
      merge_requests += MergeRequest.opened
        .where(source_branch: @branch_name, source_project: @project)
        .where.not(target_project: @project).to_a

      filter_merge_requests(merge_requests).each do |merge_request|
        if merge_request.source_branch == @branch_name || force_push?
          merge_request.reload_diff(current_user)
        else
          mr_commit_ids = merge_request.commit_shas
          push_commit_ids = @commits.map(&:id)
          matches = mr_commit_ids & push_commit_ids
          merge_request.reload_diff(current_user) if matches.any?
        end

        merge_request.mark_as_unchecked
        UpdateHeadPipelineForMergeRequestWorker.perform_async(merge_request.id)
      end
    end

    def reset_merge_when_pipeline_succeeds
      merge_requests_for_source_branch.each(&:reset_merge_when_pipeline_succeeds)
    end

    def mark_pending_todos_done
      merge_requests_for_source_branch.each do |merge_request|
        todo_service.merge_request_push(merge_request, @current_user)
      end
    end

    def find_new_commits
      if branch_added?
        @commits = []

        merge_request = merge_requests_for_source_branch.first
        return unless merge_request

        begin
          # Since any number of commits could have been made to the restored branch,
          # find the common root to see what has been added.
          common_ref = @project.repository.merge_base(merge_request.diff_head_sha, @newrev)
          # If the a commit no longer exists in this repo, gitlab_git throws
          # a Rugged::OdbError. This is fixed in https://gitlab.com/gitlab-org/gitlab_git/merge_requests/52
          @commits = @project.repository.commits_between(common_ref, @newrev) if common_ref
        rescue
        end
      elsif branch_removed?
        # No commits for a deleted branch.
        @commits = []
      else
        @commits = @project.repository.commits_between(@oldrev, @newrev)
      end
    end

    # Add comment about branches being deleted or added to merge requests
    def comment_mr_branch_presence_changed
      presence = branch_added? ? :add : :delete

      merge_requests_for_source_branch.each do |merge_request|
        SystemNoteService.change_branch_presence(
          merge_request, merge_request.project, @current_user,
            :source, @branch_name, presence)
      end
    end

    # Add comment about pushing new commits to merge requests
    def comment_mr_with_commits
      return unless @commits.present?

      merge_requests_for_source_branch.each do |merge_request|
        mr_commit_ids = Set.new(merge_request.commit_shas)

        new_commits, existing_commits = @commits.partition do |commit|
          mr_commit_ids.include?(commit.id)
        end

        SystemNoteService.add_commits(merge_request, merge_request.project,
                                      @current_user, new_commits,
                                      existing_commits, @oldrev)
      end
    end

    def mark_mr_as_wip_from_commits
      return unless @commits.present?

      merge_requests_for_source_branch.each do |merge_request|
        commit_shas = merge_request.commit_shas

        wip_commit = @commits.detect do |commit|
          commit.work_in_progress? && commit_shas.include?(commit.sha)
        end

        if wip_commit && !merge_request.work_in_progress?
          merge_request.update(title: merge_request.wip_title)
          SystemNoteService.add_merge_request_wip_from_commit(
            merge_request,
            merge_request.project,
            @current_user,
            wip_commit
          )
        end
      end
    end

    # Call merge request webhook with update branches
    def execute_mr_web_hooks
      merge_requests_for_source_branch.each do |merge_request|
        execute_hooks(merge_request, 'update', old_rev: @oldrev)
      end
    end

    # If the merge requests closes any issues, save this information in the
    # `MergeRequestsClosingIssues` model (as a performance optimization).
    def cache_merge_requests_closing_issues
      @project.merge_requests.where(source_branch: @branch_name).each do |merge_request|
        merge_request.cache_merge_request_closes_issues!(@current_user)
      end
    end

    def filter_merge_requests(merge_requests)
      merge_requests.uniq.select(&:source_project)
    end

    def merge_requests_for_source_branch
      @source_merge_requests ||= merge_requests_for(@branch_name)
    end

    def branch_added?
      Gitlab::Git.blank_ref?(@oldrev)
    end

    def branch_removed?
      Gitlab::Git.blank_ref?(@newrev)
    end
  end
end