about summary refs log blame commit diff
path: root/third_party/go/git-appraise/repository/mock_repo.go
blob: 2d8debe48387050548d08c74bfe6e48f16890436 (plain) (tree)
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
609
610
611
612
613




































































































































































































































































































































































































































































































































































































































                                                                                                                                                                                                        
/*
Copyright 2015 Google Inc. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package repository

import (
	"crypto/sha1"
	"encoding/json"
	"fmt"
	"strings"
)

// Constants used for testing.
// We initialize our mock repo with two branches (one of which holds a pending review),
// and commit history that looks like this:
//
//  Master Branch:    A--B--D--E--F--J
//                     \   /    \  \
//                       C       \  \
//                                \  \
//  Review Branch:                 G--H--I
//
// Where commits "B" and "D" represent reviews that have been submitted, and "G"
// is a pending review.
const (
	TestTargetRef          = "refs/heads/master"
	TestReviewRef          = "refs/heads/ojarjur/mychange"
	TestAlternateReviewRef = "refs/review/mychange"
	TestRequestsRef        = "refs/notes/devtools/reviews"
	TestCommentsRef        = "refs/notes/devtools/discuss"

	TestCommitA = "A"
	TestCommitB = "B"
	TestCommitC = "C"
	TestCommitD = "D"
	TestCommitE = "E"
	TestCommitF = "F"
	TestCommitG = "G"
	TestCommitH = "H"
	TestCommitI = "I"
	TestCommitJ = "J"

	TestRequestB = `{"timestamp": "0000000001", "reviewRef": "refs/heads/ojarjur/mychange", "targetRef": "refs/heads/master", "requester": "ojarjur", "reviewers": ["ojarjur"], "description": "B"}`
	TestRequestD = `{"timestamp": "0000000002", "reviewRef": "refs/heads/ojarjur/mychange", "targetRef": "refs/heads/master", "requester": "ojarjur", "reviewers": ["ojarjur"], "description": "D"}`
	TestRequestG = `{"timestamp": "0000000004", "reviewRef": "refs/heads/ojarjur/mychange", "targetRef": "refs/heads/master", "requester": "ojarjur", "reviewers": ["ojarjur"], "description": "G"}

{"timestamp": "0000000005", "reviewRef": "refs/heads/ojarjur/mychange", "targetRef": "refs/heads/master", "requester": "ojarjur", "reviewers": ["ojarjur"], "description": "Updated description of G"}

{"timestamp": "0000000005", "reviewRef": "refs/heads/ojarjur/mychange", "targetRef": "refs/heads/master", "requester": "ojarjur", "reviewers": ["ojarjur"], "description": "Final description of G"}`

	TestDiscussB = `{"timestamp": "0000000001", "author": "ojarjur", "location": {"commit": "B"}, "resolved": true}`
	TestDiscussD = `{"timestamp": "0000000003", "author": "ojarjur", "location": {"commit": "E"}, "resolved": true}`
)

type mockCommit struct {
	Message string   `json:"message,omitempty"`
	Time    string   `json:"time,omitempty"`
	Parents []string `json:"parents,omitempty"`
}

// mockRepoForTest defines an instance of Repo that can be used for testing.
type mockRepoForTest struct {
	Head    string
	Refs    map[string]string            `json:"refs,omitempty"`
	Commits map[string]mockCommit        `json:"commits,omitempty"`
	Notes   map[string]map[string]string `json:"notes,omitempty"`
}

func (r *mockRepoForTest) createCommit(message string, time string, parents []string) (string, error) {
	newCommit := mockCommit{
		Message: message,
		Time:    time,
		Parents: parents,
	}
	newCommitJSON, err := json.Marshal(newCommit)
	if err != nil {
		return "", err
	}
	newCommitHash := fmt.Sprintf("%x", sha1.Sum([]byte(newCommitJSON)))
	r.Commits[newCommitHash] = newCommit
	return newCommitHash, nil
}

// NewMockRepoForTest returns a mocked-out instance of the Repo interface that has been pre-populated with test data.
func NewMockRepoForTest() Repo {
	commitA := mockCommit{
		Message: "First commit",
		Time:    "0",
		Parents: nil,
	}
	commitB := mockCommit{
		Message: "Second commit",
		Time:    "1",
		Parents: []string{TestCommitA},
	}
	commitC := mockCommit{
		Message: "No, I'm the second commit",
		Time:    "1",
		Parents: []string{TestCommitA},
	}
	commitD := mockCommit{
		Message: "Fourth commit",
		Time:    "2",
		Parents: []string{TestCommitB, TestCommitC},
	}
	commitE := mockCommit{
		Message: "Fifth commit",
		Time:    "3",
		Parents: []string{TestCommitD},
	}
	commitF := mockCommit{
		Message: "Sixth commit",
		Time:    "4",
		Parents: []string{TestCommitE},
	}
	commitG := mockCommit{
		Message: "No, I'm the sixth commit",
		Time:    "4",
		Parents: []string{TestCommitE},
	}
	commitH := mockCommit{
		Message: "Seventh commit",
		Time:    "5",
		Parents: []string{TestCommitG, TestCommitF},
	}
	commitI := mockCommit{
		Message: "Eighth commit",
		Time:    "6",
		Parents: []string{TestCommitH},
	}
	commitJ := mockCommit{
		Message: "No, I'm the eighth commit",
		Time:    "6",
		Parents: []string{TestCommitF},
	}
	return &mockRepoForTest{
		Head: TestTargetRef,
		Refs: map[string]string{
			TestTargetRef:          TestCommitJ,
			TestReviewRef:          TestCommitI,
			TestAlternateReviewRef: TestCommitI,
		},
		Commits: map[string]mockCommit{
			TestCommitA: commitA,
			TestCommitB: commitB,
			TestCommitC: commitC,
			TestCommitD: commitD,
			TestCommitE: commitE,
			TestCommitF: commitF,
			TestCommitG: commitG,
			TestCommitH: commitH,
			TestCommitI: commitI,
			TestCommitJ: commitJ,
		},
		Notes: map[string]map[string]string{
			TestRequestsRef: map[string]string{
				TestCommitB: TestRequestB,
				TestCommitD: TestRequestD,
				TestCommitG: TestRequestG,
			},
			TestCommentsRef: map[string]string{
				TestCommitB: TestDiscussB,
				TestCommitD: TestDiscussD,
			},
		},
	}
}

// GetPath returns the path to the repo.
func (r *mockRepoForTest) GetPath() string { return "~/mockRepo/" }

// GetRepoStateHash returns a hash which embodies the entire current state of a repository.
func (r *mockRepoForTest) GetRepoStateHash() (string, error) {
	repoJSON, err := json.Marshal(r)
	if err != nil {
		return "", err
	}
	return fmt.Sprintf("%x", sha1.Sum([]byte(repoJSON))), nil
}

// GetUserEmail returns the email address that the user has used to configure git.
func (r *mockRepoForTest) GetUserEmail() (string, error) { return "user@example.com", nil }

// GetUserSigningKey returns the key id the user has configured for
// sigining git artifacts.
func (r *mockRepoForTest) GetUserSigningKey() (string, error) {
	return "gpgsig", nil
}

// GetCoreEditor returns the name of the editor that the user has used to configure git.
func (r *mockRepoForTest) GetCoreEditor() (string, error) { return "vi", nil }

// GetSubmitStrategy returns the way in which a review is submitted
func (r *mockRepoForTest) GetSubmitStrategy() (string, error) { return "merge", nil }

// HasUncommittedChanges returns true if there are local, uncommitted changes.
func (r *mockRepoForTest) HasUncommittedChanges() (bool, error) { return false, nil }

func (r *mockRepoForTest) resolveLocalRef(ref string) (string, error) {
	if ref == "HEAD" {
		ref = r.Head
	}
	if commit, ok := r.Refs[ref]; ok {
		return commit, nil
	}
	if _, ok := r.Commits[ref]; ok {
		return ref, nil
	}
	return "", fmt.Errorf("The ref %q does not exist", ref)
}

// VerifyCommit verifies that the supplied hash points to a known commit.
func (r *mockRepoForTest) VerifyCommit(hash string) error {
	if _, ok := r.Commits[hash]; !ok {
		return fmt.Errorf("The given hash %q is not a known commit", hash)
	}
	return nil
}

// VerifyGitRef verifies that the supplied ref points to a known commit.
func (r *mockRepoForTest) VerifyGitRef(ref string) error {
	_, err := r.resolveLocalRef(ref)
	return err
}

// GetHeadRef returns the ref that is the current HEAD.
func (r *mockRepoForTest) GetHeadRef() (string, error) { return r.Head, nil }

// GetCommitHash returns the hash of the commit pointed to by the given ref.
func (r *mockRepoForTest) GetCommitHash(ref string) (string, error) {
	err := r.VerifyGitRef(ref)
	if err != nil {
		return "", err
	}
	return r.resolveLocalRef(ref)
}

// ResolveRefCommit returns the commit pointed to by the given ref, which may be a remote ref.
//
// This differs from GetCommitHash which only works on exact matches, in that it will try to
// intelligently handle the scenario of a ref not existing locally, but being known to exist
// in a remote repo.
//
// This method should be used when a command may be performed by either the reviewer or the
// reviewee, while GetCommitHash should be used when the encompassing command should only be
// performed by the reviewee.
func (r *mockRepoForTest) ResolveRefCommit(ref string) (string, error) {
	if commit, err := r.resolveLocalRef(ref); err == nil {
		return commit, err
	}
	return r.resolveLocalRef(strings.Replace(ref, "refs/heads/", "refs/remotes/origin/", 1))
}

func (r *mockRepoForTest) getCommit(ref string) (mockCommit, error) {
	commit, err := r.resolveLocalRef(ref)
	return r.Commits[commit], err
}

// GetCommitMessage returns the message stored in the commit pointed to by the given ref.
func (r *mockRepoForTest) GetCommitMessage(ref string) (string, error) {
	commit, err := r.getCommit(ref)
	if err != nil {
		return "", err
	}
	return commit.Message, nil
}

// GetCommitTime returns the commit time of the commit pointed to by the given ref.
func (r *mockRepoForTest) GetCommitTime(ref string) (string, error) {
	commit, err := r.getCommit(ref)
	if err != nil {
		return "", err
	}
	return commit.Time, nil
}

// GetLastParent returns the last parent of the given commit (as ordered by git).
func (r *mockRepoForTest) GetLastParent(ref string) (string, error) {
	commit, err := r.getCommit(ref)
	if len(commit.Parents) > 0 {
		return commit.Parents[len(commit.Parents)-1], err
	}
	return "", err
}

// GetCommitDetails returns the details of a commit's metadata.
func (r *mockRepoForTest) GetCommitDetails(ref string) (*CommitDetails, error) {
	commit, err := r.getCommit(ref)
	if err != nil {
		return nil, err
	}
	var details CommitDetails
	details.Author = "Test Author"
	details.AuthorEmail = "author@example.com"
	details.Summary = commit.Message
	details.Time = commit.Time
	details.Parents = commit.Parents
	return &details, nil
}

// ancestors returns the breadth-first traversal of a commit's ancestors
func (r *mockRepoForTest) ancestors(commit string) ([]string, error) {
	queue := []string{commit}
	var ancestors []string
	for queue != nil {
		var nextQueue []string
		for _, c := range queue {
			commit, err := r.getCommit(c)
			if err != nil {
				return nil, err
			}
			parents := commit.Parents
			nextQueue = append(nextQueue, parents...)
			ancestors = append(ancestors, parents...)
		}
		queue = nextQueue
	}
	return ancestors, nil
}

// IsAncestor determines if the first argument points to a commit that is an ancestor of the second.
func (r *mockRepoForTest) IsAncestor(ancestor, descendant string) (bool, error) {
	var err error
	ancestor, err = r.resolveLocalRef(ancestor)
	if err != nil {
		return false, err
	}
	descendant, err = r.resolveLocalRef(descendant)
	if err != nil {
		return false, err
	}
	if ancestor == descendant {
		return true, nil
	}
	descendantCommit, err := r.getCommit(descendant)
	if err != nil {
		return false, err
	}
	for _, parent := range descendantCommit.Parents {
		if t, e := r.IsAncestor(ancestor, parent); e == nil && t {
			return true, nil
		}
	}
	return false, nil
}

// MergeBase determines if the first commit that is an ancestor of the two arguments.
func (r *mockRepoForTest) MergeBase(a, b string) (string, error) {
	ancestors, err := r.ancestors(a)
	if err != nil {
		return "", err
	}
	for _, ancestor := range ancestors {
		if t, e := r.IsAncestor(ancestor, b); e == nil && t {
			return ancestor, nil
		}
	}
	return "", nil
}

// Diff computes the diff between two given commits.
func (r *mockRepoForTest) Diff(left, right string, diffArgs ...string) (string, error) {
	return fmt.Sprintf("Diff between %q and %q", left, right), nil
}

// Show returns the contents of the given file at the given commit.
func (r *mockRepoForTest) Show(commit, path string) (string, error) {
	return fmt.Sprintf("%s:%s", commit, path), nil
}

// SwitchToRef changes the currently-checked-out ref.
func (r *mockRepoForTest) SwitchToRef(ref string) error {
	r.Head = ref
	return nil
}

// ArchiveRef adds the current commit pointed to by the 'ref' argument
// under the ref specified in the 'archive' argument.
//
// Both the 'ref' and 'archive' arguments are expected to be the fully
// qualified names of git refs (e.g. 'refs/heads/my-change' or
// 'refs/archive/devtools').
//
// If the ref pointed to by the 'archive' argument does not exist
// yet, then it will be created.
func (r *mockRepoForTest) ArchiveRef(ref, archive string) error {
	commitToArchive, err := r.resolveLocalRef(ref)
	if err != nil {
		return err
	}
	var archiveParents []string
	if archiveCommit, err := r.resolveLocalRef(archive); err == nil {
		archiveParents = []string{archiveCommit, commitToArchive}
	} else {
		archiveParents = []string{commitToArchive}
	}
	archiveCommit, err := r.createCommit("Archiving", "Nowish", archiveParents)
	if err != nil {
		return err
	}
	r.Refs[archive] = archiveCommit
	return nil
}

// MergeRef merges the given ref into the current one.
//
// The ref argument is the ref to merge, and fastForward indicates that the
// current ref should only move forward, as opposed to creating a bubble merge.
func (r *mockRepoForTest) MergeRef(ref string, fastForward bool, messages ...string) error {
	newCommitHash, err := r.resolveLocalRef(ref)
	if err != nil {
		return err
	}
	if !fastForward {
		origCommit, err := r.resolveLocalRef(r.Head)
		if err != nil {
			return err
		}
		newCommit, err := r.getCommit(ref)
		if err != nil {
			return err
		}
		message := strings.Join(messages, "\n\n")
		time := newCommit.Time
		parents := []string{origCommit, newCommitHash}
		newCommitHash, err = r.createCommit(message, time, parents)
		if err != nil {
			return err
		}
	}
	r.Refs[r.Head] = newCommitHash
	return nil
}

// MergeAndSignRef merges the given ref into the current one and signs the
// merge.
//
// The ref argument is the ref to merge, and fastForward indicates that the
// current ref should only move forward, as opposed to creating a bubble merge.
func (r *mockRepoForTest) MergeAndSignRef(ref string, fastForward bool,
	messages ...string) error {
	return nil
}

// RebaseRef rebases the current ref onto the given one.
func (r *mockRepoForTest) RebaseRef(ref string) error {
	parentHash := r.Refs[ref]
	origCommit, err := r.getCommit(r.Head)
	if err != nil {
		return err
	}
	newCommitHash, err := r.createCommit(origCommit.Message, origCommit.Time, []string{parentHash})
	if err != nil {
		return err
	}
	if strings.HasPrefix(r.Head, "refs/heads/") {
		r.Refs[r.Head] = newCommitHash
	} else {
		// The current head is not a branch, so updating
		// it should leave us in a detached-head state.
		r.Head = newCommitHash
	}
	return nil
}

// RebaseAndSignRef rebases the current ref onto the given one and signs the
// result.
func (r *mockRepoForTest) RebaseAndSignRef(ref string) error { return nil }

// ListCommits returns the list of commits reachable from the given ref.
//
// The generated list is in chronological order (with the oldest commit first).
//
// If the specified ref does not exist, then this method returns an empty result.
func (r *mockRepoForTest) ListCommits(ref string) []string { return nil }

// ListCommitsBetween returns the list of commits between the two given revisions.
//
// The "from" parameter is the starting point (exclusive), and the "to"
// parameter is the ending point (inclusive).
//
// The "from" commit does not need to be an ancestor of the "to" commit. If it
// is not, then the merge base of the two is used as the starting point.
// Admittedly, this makes calling these the "between" commits is a bit of a
// misnomer, but it also makes the method easier to use when you want to
// generate the list of changes in a feature branch, as it eliminates the need
// to explicitly calculate the merge base. This also makes the semantics of the
// method compatible with git's built-in "rev-list" command.
//
// The generated list is in chronological order (with the oldest commit first).
func (r *mockRepoForTest) ListCommitsBetween(from, to string) ([]string, error) {
	commits := []string{to}
	potentialCommits, _ := r.ancestors(to)
	for _, commit := range potentialCommits {
		blocked, err := r.IsAncestor(commit, from)
		if err != nil {
			return nil, err
		}
		if !blocked {
			commits = append(commits, commit)
		}
	}
	return commits, nil
}

// GetNotes reads the notes from the given ref that annotate the given revision.
func (r *mockRepoForTest) GetNotes(notesRef, revision string) []Note {
	notesText := r.Notes[notesRef][revision]
	var notes []Note
	for _, line := range strings.Split(notesText, "\n") {
		notes = append(notes, Note(line))
	}
	return notes
}

// GetAllNotes reads the contents of the notes under the given ref for every commit.
//
// The returned value is a mapping from commit hash to the list of notes for that commit.
//
// This is the batch version of the corresponding GetNotes(...) method.
func (r *mockRepoForTest) GetAllNotes(notesRef string) (map[string][]Note, error) {
	notesMap := make(map[string][]Note)
	for _, commit := range r.ListNotedRevisions(notesRef) {
		notesMap[commit] = r.GetNotes(notesRef, commit)
	}
	return notesMap, nil
}

// AppendNote appends a note to a revision under the given ref.
func (r *mockRepoForTest) AppendNote(ref, revision string, note Note) error {
	existingNotes := r.Notes[ref][revision]
	newNotes := existingNotes + "\n" + string(note)
	r.Notes[ref][revision] = newNotes
	return nil
}

// ListNotedRevisions returns the collection of revisions that are annotated by notes in the given ref.
func (r *mockRepoForTest) ListNotedRevisions(notesRef string) []string {
	var revisions []string
	for revision := range r.Notes[notesRef] {
		if _, ok := r.Commits[revision]; ok {
			revisions = append(revisions, revision)
		}
	}
	return revisions
}

// PushNotes pushes git notes to a remote repo.
func (r *mockRepoForTest) PushNotes(remote, notesRefPattern string) error { return nil }

// PullNotes fetches the contents of the given notes ref from a remote repo,
// and then merges them with the corresponding local notes using the
// "cat_sort_uniq" strategy.
func (r *mockRepoForTest) PullNotes(remote, notesRefPattern string) error { return nil }

// PushNotesAndArchive pushes the given notes and archive refs to a remote repo.
func (r *mockRepoForTest) PushNotesAndArchive(remote, notesRefPattern, archiveRefPattern string) error {
	return nil
}

// PullNotesAndArchive fetches the contents of the notes and archives refs from
// a remote repo, and merges them with the corresponding local refs.
//
// For notes refs, we assume that every note can be automatically merged using
// the 'cat_sort_uniq' strategy (the git-appraise schemas fit that requirement),
// so we automatically merge the remote notes into the local notes.
//
// For "archive" refs, they are expected to be used solely for maintaining
// reachability of commits that are part of the history of any reviews,
// so we do not maintain any consistency with their tree objects. Instead,
// we merely ensure that their history graph includes every commit that we
// intend to keep.
func (r *mockRepoForTest) PullNotesAndArchive(remote, notesRefPattern, archiveRefPattern string) error {
	return nil
}

// MergeNotes merges in the remote's state of the archives reference into
// the local repository's.
func (repo *mockRepoForTest) MergeNotes(remote, notesRefPattern string) error {
	return nil
}

// MergeArchives merges in the remote's state of the archives reference into
// the local repository's.
func (repo *mockRepoForTest) MergeArchives(remote,
	archiveRefPattern string) error {
	return nil
}

// FetchAndReturnNewReviewHashes fetches the notes "branches" and then susses
// out the IDs (the revision the review points to) of any new reviews, then
// returns that list of IDs.
//
// This is accomplished by determining which files in the notes tree have
// changed because the _names_ of these files correspond to the revisions they
// point to.
func (repo *mockRepoForTest) FetchAndReturnNewReviewHashes(remote, notesRefPattern,
	archiveRefPattern string) ([]string, error) {
	return nil, nil
}