summaryrefslogtreecommitdiff
path: root/app/models/merge_request.rb
blob: 36bc98bdb1e1a18cee0972225acc48eeb7fa1ecd (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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
class MergeRequest < ActiveRecord::Base
  include InternalId
  include Issuable
  include Referable
  include Sortable
  include Taskable
  include Importable

  belongs_to :target_project, foreign_key: :target_project_id, class_name: "Project"
  belongs_to :source_project, foreign_key: :source_project_id, class_name: "Project"
  belongs_to :merge_user, class_name: "User"

  has_one :merge_request_diff, dependent: :destroy

  serialize :merge_params, Hash

  after_create :create_merge_request_diff, unless: :importing
  after_update :update_merge_request_diff

  delegate :commits, :diffs, :real_size, to: :merge_request_diff, prefix: nil

  # When this attribute is true some MR validation is ignored
  # It allows us to close or modify broken merge requests
  attr_accessor :allow_broken

  # Temporary fields to store compare vars
  # when creating new merge request
  attr_accessor :can_be_created, :compare_commits, :compare

  # Temporary fields to store target_sha, and base_sha to
  # compare when importing pull requests from GitHub
  attr_accessor :base_target_sha, :head_source_sha

  state_machine :state, initial: :opened do
    event :close do
      transition [:reopened, :opened] => :closed
    end

    event :mark_as_merged do
      transition [:reopened, :opened, :locked] => :merged
    end

    event :reopen do
      transition closed: :reopened
    end

    event :lock_mr do
      transition [:reopened, :opened] => :locked
    end

    event :unlock_mr do
      transition locked: :reopened
    end

    after_transition any => :locked do |merge_request, transition|
      merge_request.locked_at = Time.now
      merge_request.save
    end

    after_transition locked: (any - :locked) do |merge_request, transition|
      merge_request.locked_at = nil
      merge_request.save
    end

    state :opened
    state :reopened
    state :closed
    state :merged
    state :locked
  end

  state_machine :merge_status, initial: :unchecked do
    event :mark_as_unchecked do
      transition [:can_be_merged, :cannot_be_merged] => :unchecked
    end

    event :mark_as_mergeable do
      transition [:unchecked, :cannot_be_merged] => :can_be_merged
    end

    event :mark_as_unmergeable do
      transition [:unchecked, :can_be_merged] => :cannot_be_merged
    end

    state :unchecked
    state :can_be_merged
    state :cannot_be_merged

    around_transition do |merge_request, transition, block|
      merge_request.record_timestamps = false
      begin
        block.call
      ensure
        merge_request.record_timestamps = true
      end
    end
  end

  validates :source_project, presence: true, unless: [:allow_broken, :importing?]
  validates :source_branch, presence: true
  validates :target_project, presence: true
  validates :target_branch, presence: true
  validates :merge_user, presence: true, if: :merge_when_build_succeeds?
  validate :validate_branches, unless: [:allow_broken, :importing?]
  validate :validate_fork

  scope :by_branch, ->(branch_name) { where("(source_branch LIKE :branch) OR (target_branch LIKE :branch)", branch: branch_name) }
  scope :cared, ->(user) { where('assignee_id = :user OR author_id = :user', user: user.id) }
  scope :by_milestone, ->(milestone) { where(milestone_id: milestone) }
  scope :of_projects, ->(ids) { where(target_project_id: ids) }
  scope :from_project, ->(project) { where(source_project_id: project.id) }
  scope :merged, -> { with_state(:merged) }
  scope :closed_and_merged, -> { with_states(:closed, :merged) }

  scope :join_project, -> { joins(:target_project) }
  scope :references_project, -> { references(:target_project) }

  def self.reference_prefix
    '!'
  end

  # Pattern used to extract `!123` merge request references from text
  #
  # This pattern supports cross-project references.
  def self.reference_pattern
    @reference_pattern ||= %r{
      (#{Project.reference_pattern})?
      #{Regexp.escape(reference_prefix)}(?<merge_request>\d+)
    }x
  end

  def self.link_reference_pattern
    @link_reference_pattern ||= super("merge_requests", /(?<merge_request>\d+)/)
  end

  def self.reference_valid?(reference)
    reference.to_i > 0 && reference.to_i <= Gitlab::Database::MAX_INT_VALUE
  end

  # Returns all the merge requests from an ActiveRecord:Relation.
  #
  # This method uses a UNION as it usually operates on the result of
  # ProjectsFinder#execute. PostgreSQL in particular doesn't always like queries
  # using multiple sub-queries especially when combined with an OR statement.
  # UNIONs on the other hand perform much better in these cases.
  #
  # relation - An ActiveRecord::Relation that returns a list of Projects.
  #
  # Returns an ActiveRecord::Relation.
  def self.in_projects(relation)
    source = where(source_project_id: relation).select(:id)
    target = where(target_project_id: relation).select(:id)
    union  = Gitlab::SQL::Union.new([source, target])

    where("merge_requests.id IN (#{union.to_sql})")
  end

  def to_reference(from_project = nil)
    reference = "#{self.class.reference_prefix}#{iid}"

    if cross_project_reference?(from_project)
      reference = project.to_reference + reference
    end

    reference
  end

  def last_commit
    merge_request_diff ? merge_request_diff.last_commit : compare_commits.last
  end

  def first_commit
    merge_request_diff ? merge_request_diff.first_commit : compare_commits.first
  end

  def diff_size
    merge_request_diff.size
  end

  def diff_base_commit
    if merge_request_diff
      merge_request_diff.base_commit
    elsif source_sha
      self.target_project.merge_base_commit(self.source_sha, self.target_branch)
    end
  end

  def last_commit_short_sha
    last_commit.short_id
  end

  def validate_branches
    if target_project == source_project && target_branch == source_branch
      errors.add :branch_conflict, "You can not use same project/branch for source and target"
    end

    if opened? || reopened?
      similar_mrs = self.target_project.merge_requests.where(source_branch: source_branch, target_branch: target_branch, source_project_id: source_project.try(:id)).opened
      similar_mrs = similar_mrs.where('id not in (?)', self.id) if self.id
      if similar_mrs.any?
        errors.add :validate_branches,
                   "Cannot Create: This merge request already exists: #{similar_mrs.pluck(:title)}"
      end
    end
  end

  def validate_fork
    return true unless target_project && source_project

    if target_project == source_project
      true
    else
      # If source and target projects are different
      # we should check if source project is actually a fork of target project
      if source_project.forked_from?(target_project)
        true
      else
        errors.add :validate_fork,
                   'Source project is not a fork of target project'
      end
    end
  end

  def update_merge_request_diff
    if source_branch_changed? || target_branch_changed?
      reload_code
    end
  end

  def reload_code
    if merge_request_diff && open?
      merge_request_diff.reload_content
    end
  end

  def check_if_can_be_merged
    return unless unchecked?

    can_be_merged =
      !broken? && project.repository.can_be_merged?(source_sha, target_branch)

    if can_be_merged
      mark_as_mergeable
    else
      mark_as_unmergeable
    end
  end

  def merge_event
    self.target_project.events.where(target_id: self.id, target_type: "MergeRequest", action: Event::MERGED).last
  end

  def closed_event
    self.target_project.events.where(target_id: self.id, target_type: "MergeRequest", action: Event::CLOSED).last
  end

  WIP_REGEX = /\A\s*(\[WIP\]\s*|WIP:\s*|WIP\s+)+\s*/i.freeze

  def work_in_progress?
    !!(title =~ WIP_REGEX)
  end

  def wipless_title
    self.title.sub(WIP_REGEX, "")
  end

  def mergeable?
    return false unless mergeable_state?

    check_if_can_be_merged

    can_be_merged?
  end

  def mergeable_state?
    return false unless open?
    return false if work_in_progress?
    return false if broken?
    return false unless mergeable_ci_state?

    true
  end

  def can_cancel_merge_when_build_succeeds?(current_user)
    can_be_merged_by?(current_user) || self.author == current_user
  end

  def can_remove_source_branch?(current_user)
    !source_project.protected_branch?(source_branch) &&
      !source_project.root_ref?(source_branch) &&
      Ability.abilities.allowed?(current_user, :push_code, source_project) &&
      last_commit == source_project.commit(source_branch)
  end

  def should_remove_source_branch?
    merge_params['should_remove_source_branch'].present?
  end

  def force_remove_source_branch?
    merge_params['force_remove_source_branch'].present?
  end

  def remove_source_branch?
    should_remove_source_branch? || force_remove_source_branch?
  end

  def mr_and_commit_notes
    # Fetch comments only from last 100 commits
    commits_for_notes_limit = 100
    commit_ids = commits.last(commits_for_notes_limit).map(&:id)

    Note.where(
      "(project_id = :target_project_id AND noteable_type = 'MergeRequest' AND noteable_id = :mr_id) OR" +
      "((project_id = :source_project_id OR project_id = :target_project_id) AND noteable_type = 'Commit' AND commit_id IN (:commit_ids))",
      mr_id: id,
      commit_ids: commit_ids,
      target_project_id: target_project_id,
      source_project_id: source_project_id
    )
  end

  # Returns the commit as a series of email patches.
  #
  # see "git format-patch"
  def to_patch
    target_project.repository.format_patch(diff_base_commit.sha, source_sha)
  end

  def hook_attrs
    attrs = {
      source: source_project.try(:hook_attrs),
      target: target_project.hook_attrs,
      last_commit: nil,
      work_in_progress: work_in_progress?
    }

    if last_commit
      attrs.merge!(last_commit: last_commit.hook_attrs)
    end

    attributes.merge!(attrs)
  end

  def for_fork?
    target_project != source_project
  end

  def project
    target_project
  end

  def closes_issue?(issue)
    closes_issues.include?(issue)
  end

  # Return the set of issues that will be closed if this merge request is accepted.
  def closes_issues(current_user = self.author)
    if target_branch == project.default_branch
      messages = commits.map(&:safe_message) << description

      Gitlab::ClosingIssueExtractor.new(project, current_user).
        closed_by_message(messages.join("\n"))
    else
      []
    end
  end

  def target_project_path
    if target_project
      target_project.path_with_namespace
    else
      "(removed)"
    end
  end

  def source_project_path
    if source_project
      source_project.path_with_namespace
    else
      "(removed)"
    end
  end

  def source_project_namespace
    if source_project && source_project.namespace
      source_project.namespace.path
    else
      "(removed)"
    end
  end

  def target_project_namespace
    if target_project && target_project.namespace
      target_project.namespace.path
    else
      "(removed)"
    end
  end

  def source_branch_exists?
    return false unless self.source_project

    self.source_project.repository.branch_names.include?(self.source_branch)
  end

  def target_branch_exists?
    return false unless self.target_project

    self.target_project.repository.branch_names.include?(self.target_branch)
  end

  # Reset merge request events cache
  #
  # Since we do cache @event we need to reset cache in special cases:
  # * when a merge request is updated
  # Events cache stored like  events/23-20130109142513.
  # The cache key includes updated_at timestamp.
  # Thus it will automatically generate a new fragment
  # when the event is updated because the key changes.
  def reset_events_cache
    Event.reset_event_cache_for(self)
  end

  def merge_commit_message
    message = "Merge branch '#{source_branch}' into '#{target_branch}'"
    message << "\n\n"
    message << title.to_s
    message << "\n\n"
    message << description.to_s
    message << "\n\n"
    message << "See merge request !#{iid}"
    message
  end

  def reset_merge_when_build_succeeds
    return unless merge_when_build_succeeds?

    self.merge_when_build_succeeds = false
    self.merge_user = nil
    if merge_params
      merge_params.delete('should_remove_source_branch')
      merge_params.delete('commit_message')
    end

    self.save
  end

  # Return array of possible target branches
  # depends on target project of MR
  def target_branches
    if target_project.nil?
      []
    else
      target_project.repository.branch_names
    end
  end

  # Return array of possible source branches
  # depends on source project of MR
  def source_branches
    if source_project.nil?
      []
    else
      source_project.repository.branch_names
    end
  end

  def locked_long_ago?
    return false unless locked?

    locked_at.nil? || locked_at < (Time.now - 1.day)
  end

  def has_ci?
    source_project.ci_service && commits.any?
  end

  def branch_missing?
    !source_branch_exists? || !target_branch_exists?
  end

  def broken?
    self.commits.blank? || branch_missing? || cannot_be_merged?
  end

  def can_be_merged_by?(user)
    ::Gitlab::GitAccess.new(user, project).can_push_to_branch?(target_branch)
  end

  def mergeable_ci_state?
    return true unless project.only_allow_merge_if_build_succeeds?

    !pipeline || pipeline.success?
  end

  def state_human_name
    if merged?
      "Merged"
    elsif closed?
      "Closed"
    else
      "Open"
    end
  end

  def state_icon_name
    if merged?
      "check"
    elsif closed?
      "times"
    else
      "circle-o"
    end
  end

  def target_sha
    return @base_target_sha if defined?(@base_target_sha)

    target_project.repository.commit(target_branch).try(:sha)
  end

  def source_sha
    return @head_source_sha if defined?(@head_source_sha)

    last_commit.try(:sha) || source_tip.try(:sha)
  end

  def source_tip
    source_branch && source_project.repository.commit(source_branch)
  end

  def fetch_ref
    target_project.repository.fetch_ref(
      source_project.repository.path_to_repo,
      "refs/heads/#{source_branch}",
      ref_path
    )
  end

  def ref_path
    "refs/merge-requests/#{iid}/head"
  end

  def ref_is_fetched?
    File.exist?(File.join(project.repository.path_to_repo, ref_path))
  end

  def ensure_ref_fetched
    fetch_ref unless ref_is_fetched?
  end

  def in_locked_state
    begin
      lock_mr
      yield
    ensure
      unlock_mr if locked?
    end
  end

  def diverged_commits_count
    cache = Rails.cache.read(:"merge_request_#{id}_diverged_commits")

    if cache.blank? || cache[:source_sha] != source_sha || cache[:target_sha] != target_sha
      cache = {
        source_sha: source_sha,
        target_sha: target_sha,
        diverged_commits_count: compute_diverged_commits_count
      }
      Rails.cache.write(:"merge_request_#{id}_diverged_commits", cache)
    end

    cache[:diverged_commits_count]
  end

  def compute_diverged_commits_count
    return 0 unless source_sha && target_sha

    Gitlab::Git::Commit.between(target_project.repository.raw_repository, source_sha, target_sha).size
  end
  private :compute_diverged_commits_count

  def diverged_from_target_branch?
    diverged_commits_count > 0
  end

  def pipeline
    @pipeline ||= source_project.pipeline(last_commit.id, source_branch) if last_commit && source_project
  end

  def diff_refs
    return nil unless diff_base_commit

    [diff_base_commit, last_commit]
  end

  def merge_commit
    @merge_commit ||= project.commit(merge_commit_sha) if merge_commit_sha
  end

  def can_be_reverted?(current_user = nil)
    merge_commit && !merge_commit.has_been_reverted?(current_user, self)
  end

  def can_be_cherry_picked?
    merge_commit
  end
end