summaryrefslogtreecommitdiff
path: root/t/t5318-commit-graph.sh
blob: 23c7b7e036c18e751d83d59ce6779faec3d9b224 (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
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
#!/bin/sh
 
test_description='commit graph'
. ./test-lib.sh
 
test_expect_success 'setup full repo' '
	mkdir full &&
	cd "$TRASH_DIRECTORY/full" &&
	git init &&
	git config core.commitGraph true &&
	objdir=".git/objects" &&
	test_oid_init
'
 
test_expect_success 'verify graph with no graph file' '
	cd "$TRASH_DIRECTORY/full" &&
	git commit-graph verify
'
 
test_expect_success 'write graph with no packs' '
	cd "$TRASH_DIRECTORY/full" &&
	git commit-graph write --object-dir $objdir &&
	test_path_is_missing $objdir/info/commit-graph
'
 
test_expect_success 'exit with correct error on bad input to --stdin-packs' '
	cd "$TRASH_DIRECTORY/full" &&
	echo doesnotexist >in &&
	test_expect_code 1 git commit-graph write --stdin-packs <in 2>stderr &&
	test_i18ngrep "error adding pack" stderr
'
 
test_expect_success 'create commits and repack' '
	cd "$TRASH_DIRECTORY/full" &&
	for i in $(test_seq 3)
	do
		test_commit $i &&
		git branch commits/$i
	done &&
	git repack
'
 
test_expect_success 'exit with correct error on bad input to --stdin-commits' '
	cd "$TRASH_DIRECTORY/full" &&
	echo HEAD | test_expect_code 1 git commit-graph write --stdin-commits 2>stderr &&
	test_i18ngrep "unexpected non-hex object ID: HEAD" stderr &&
	# valid tree OID, but not a commit OID
	git rev-parse HEAD^{tree} | test_expect_code 1 git commit-graph write --stdin-commits 2>stderr &&
	test_i18ngrep "invalid commit object id" stderr
'
 
graph_expect_commits() {
	test-tool read-graph >got
	if ! grep "num_commits: $1" got
	then
		echo "graph_expect_commits: expected $1 commit(s), got:"
		cat got
		false
	fi
}
 
test_expect_success 'ignores non-commit OIDs to --input=stdin-commits with --no-check-oids' '
	test_when_finished rm -rf "$objdir/info/commit-graph" &&
	cd "$TRASH_DIRECTORY/full" &&
	# write a graph to ensure layers are/are not added appropriately
	git rev-parse HEAD~1 >base &&
	git commit-graph write --stdin-commits <base &&
	graph_expect_commits 2 &&
	# bad input is rejected
	echo HEAD >bad &&
	test_expect_code 1 git commit-graph write --stdin-commits <bad 2>err &&
	test_i18ngrep "unexpected non-hex object ID: HEAD" err &&
	graph_expect_commits 2 &&
	# update with valid commit OID, ignore tree OID
	git rev-parse HEAD HEAD^{tree} >in &&
	git commit-graph write --stdin-commits --no-check-oids <in &&
	graph_expect_commits 3
'
 
graph_git_two_modes() {
	git -c core.commitGraph=true $1 >output
	git -c core.commitGraph=false $1 >expect
	test_cmp expect output
}
 
graph_git_behavior() {
	MSG=$1
	DIR=$2
	BRANCH=$3
	COMPARE=$4
	test_expect_success "check normal git operations: $MSG" '
		cd "$TRASH_DIRECTORY/$DIR" &&
		graph_git_two_modes "log --oneline $BRANCH" &&
		graph_git_two_modes "log --topo-order $BRANCH" &&
		graph_git_two_modes "log --graph $COMPARE..$BRANCH" &&
		graph_git_two_modes "branch -vv" &&
		graph_git_two_modes "merge-base -a $BRANCH $COMPARE"
	'
}
 
graph_git_behavior 'no graph' full commits/3 commits/1
 
graph_read_expect() {
	OPTIONAL=""
	NUM_CHUNKS=3
	if test ! -z $2
	then
		OPTIONAL=" $2"
		NUM_CHUNKS=$((3 + $(echo "$2" | wc -w)))
	fi
	cat >expect <<- EOF
	header: 43475048 1 1 $NUM_CHUNKS 0
	num_commits: $1
	chunks: oid_fanout oid_lookup commit_metadata$OPTIONAL
	EOF
	test-tool read-graph >output &&
	test_cmp expect output
}
 
test_expect_success 'write graph' '
	cd "$TRASH_DIRECTORY/full" &&
	git commit-graph write &&
	test_path_is_file $objdir/info/commit-graph &&
	graph_read_expect "3"
'
 
graph_git_behavior 'graph exists' full commits/3 commits/1
 
test_expect_success 'Add more commits' '
	cd "$TRASH_DIRECTORY/full" &&
	git reset --hard commits/1 &&
	for i in $(test_seq 4 5)
	do
		test_commit $i &&
		git branch commits/$i
	done &&
	git reset --hard commits/2 &&
	for i in $(test_seq 6 7)
	do
		test_commit $i &&
		git branch commits/$i
	done &&
	git reset --hard commits/2 &&
	git merge commits/4 &&
	git branch merge/1 &&
	git reset --hard commits/4 &&
	git merge commits/6 &&
	git branch merge/2 &&
	git reset --hard commits/3 &&
	git merge commits/5 commits/7 &&
	git branch merge/3 &&
	git repack
'
 
test_expect_success 'commit-graph write progress off for redirected stderr' '
	cd "$TRASH_DIRECTORY/full" &&
	git commit-graph write 2>err &&
	test_line_count = 0 err
'
 
test_expect_success 'commit-graph write force progress on for stderr' '
	cd "$TRASH_DIRECTORY/full" &&
	GIT_PROGRESS_DELAY=0 git commit-graph write --progress 2>err &&
	test_file_not_empty err
'
 
test_expect_success 'commit-graph write with the --no-progress option' '
	cd "$TRASH_DIRECTORY/full" &&
	git commit-graph write --no-progress 2>err &&
	test_line_count = 0 err
'
 
test_expect_success 'commit-graph verify progress off for redirected stderr' '
	cd "$TRASH_DIRECTORY/full" &&
	git commit-graph verify 2>err &&
	test_line_count = 0 err
'
 
test_expect_success 'commit-graph verify force progress on for stderr' '
	cd "$TRASH_DIRECTORY/full" &&
	GIT_PROGRESS_DELAY=0 git commit-graph verify --progress 2>err &&
	test_file_not_empty err
'
 
test_expect_success 'commit-graph verify with the --no-progress option' '
	cd "$TRASH_DIRECTORY/full" &&
	git commit-graph verify --no-progress 2>err &&
	test_line_count = 0 err
'
 
# Current graph structure:
#
#   __M3___
#  /   |   \
# 3 M1 5 M2 7
# |/  \|/  \|
# 2    4    6
# |___/____/
# 1
 
test_expect_success 'write graph with merges' '
	cd "$TRASH_DIRECTORY/full" &&
	git commit-graph write &&
	test_path_is_file $objdir/info/commit-graph &&
	graph_read_expect "10" "extra_edges"
'
 
graph_git_behavior 'merge 1 vs 2' full merge/1 merge/2
graph_git_behavior 'merge 1 vs 3' full merge/1 merge/3
graph_git_behavior 'merge 2 vs 3' full merge/2 merge/3
 
test_expect_success 'Add one more commit' '
	cd "$TRASH_DIRECTORY/full" &&
	test_commit 8 &&
	git branch commits/8 &&
	ls $objdir/pack | grep idx >existing-idx &&
	git repack &&
	ls $objdir/pack| grep idx | grep -v -f existing-idx >new-idx
'
 
# Current graph structure:
#
#      8
#      |
#   __M3___
#  /   |   \
# 3 M1 5 M2 7
# |/  \|/  \|
# 2    4    6
# |___/____/
# 1
 
graph_git_behavior 'mixed mode, commit 8 vs merge 1' full commits/8 merge/1
graph_git_behavior 'mixed mode, commit 8 vs merge 2' full commits/8 merge/2
 
test_expect_success 'write graph with new commit' '
	cd "$TRASH_DIRECTORY/full" &&
	git commit-graph write &&
	test_path_is_file $objdir/info/commit-graph &&
	graph_read_expect "11" "extra_edges"
'
 
graph_git_behavior 'full graph, commit 8 vs merge 1' full commits/8 merge/1
graph_git_behavior 'full graph, commit 8 vs merge 2' full commits/8 merge/2
 
test_expect_success 'write graph with nothing new' '
	cd "$TRASH_DIRECTORY/full" &&
	git commit-graph write &&
	test_path_is_file $objdir/info/commit-graph &&
	graph_read_expect "11" "extra_edges"
'
 
graph_git_behavior 'cleared graph, commit 8 vs merge 1' full commits/8 merge/1
graph_git_behavior 'cleared graph, commit 8 vs merge 2' full commits/8 merge/2
 
test_expect_success 'build graph from latest pack with closure' '
	cd "$TRASH_DIRECTORY/full" &&
	cat new-idx | git commit-graph write --stdin-packs &&
	test_path_is_file $objdir/info/commit-graph &&
	graph_read_expect "9" "extra_edges"
'
 
graph_git_behavior 'graph from pack, commit 8 vs merge 1' full commits/8 merge/1
graph_git_behavior 'graph from pack, commit 8 vs merge 2' full commits/8 merge/2
 
test_expect_success 'build graph from commits with closure' '
	cd "$TRASH_DIRECTORY/full" &&
	git tag -a -m "merge" tag/merge merge/2 &&
	git rev-parse tag/merge >commits-in &&
	git rev-parse merge/1 >>commits-in &&
	cat commits-in | git commit-graph write --stdin-commits &&
	test_path_is_file $objdir/info/commit-graph &&
	graph_read_expect "6"
'
 
graph_git_behavior 'graph from commits, commit 8 vs merge 1' full commits/8 merge/1
graph_git_behavior 'graph from commits, commit 8 vs merge 2' full commits/8 merge/2
 
test_expect_success 'build graph from commits with append' '
	cd "$TRASH_DIRECTORY/full" &&
	git rev-parse merge/3 | git commit-graph write --stdin-commits --append &&
	test_path_is_file $objdir/info/commit-graph &&
	graph_read_expect "10" "extra_edges"
'
 
graph_git_behavior 'append graph, commit 8 vs merge 1' full commits/8 merge/1
graph_git_behavior 'append graph, commit 8 vs merge 2' full commits/8 merge/2
 
test_expect_success 'build graph using --reachable' '
	cd "$TRASH_DIRECTORY/full" &&
	git commit-graph write --reachable &&
	test_path_is_file $objdir/info/commit-graph &&
	graph_read_expect "11" "extra_edges"
'
 
graph_git_behavior 'append graph, commit 8 vs merge 1' full commits/8 merge/1
graph_git_behavior 'append graph, commit 8 vs merge 2' full commits/8 merge/2
 
test_expect_success 'setup bare repo' '
	cd "$TRASH_DIRECTORY" &&
	git clone --bare --no-local full bare &&
	cd bare &&
	git config core.commitGraph true &&
	baredir="./objects"
'
 
graph_git_behavior 'bare repo, commit 8 vs merge 1' bare commits/8 merge/1
graph_git_behavior 'bare repo, commit 8 vs merge 2' bare commits/8 merge/2
 
test_expect_success 'write graph in bare repo' '
	cd "$TRASH_DIRECTORY/bare" &&
	git commit-graph write &&
	test_path_is_file $baredir/info/commit-graph &&
	graph_read_expect "11" "extra_edges"
'
 
graph_git_behavior 'bare repo with graph, commit 8 vs merge 1' bare commits/8 merge/1
graph_git_behavior 'bare repo with graph, commit 8 vs merge 2' bare commits/8 merge/2
 
test_expect_success 'perform fast-forward merge in full repo' '
	cd "$TRASH_DIRECTORY/full" &&
	git checkout -b merge-5-to-8 commits/5 &&
	git merge commits/8 &&
	git show-ref -s merge-5-to-8 >output &&
	git show-ref -s commits/8 >expect &&
	test_cmp expect output
'
 
test_expect_success 'check that gc computes commit-graph' '
	cd "$TRASH_DIRECTORY/full" &&
	git commit --allow-empty -m "blank" &&
	git commit-graph write --reachable &&
	cp $objdir/info/commit-graph commit-graph-before-gc &&
	git reset --hard HEAD~1 &&
	git config gc.writeCommitGraph true &&
	git gc &&
	cp $objdir/info/commit-graph commit-graph-after-gc &&
	! test_cmp_bin commit-graph-before-gc commit-graph-after-gc &&
	git commit-graph write --reachable &&
	test_cmp_bin commit-graph-after-gc $objdir/info/commit-graph
'
 
test_expect_success 'replace-objects invalidates commit-graph' '
	cd "$TRASH_DIRECTORY" &&
	test_when_finished rm -rf replace &&
	git clone full replace &&
	(
		cd replace &&
		git commit-graph write --reachable &&
		test_path_is_file .git/objects/info/commit-graph &&
		git replace HEAD~1 HEAD~2 &&
		git -c core.commitGraph=false log >expect &&
		git -c core.commitGraph=true log >actual &&
		test_cmp expect actual &&
		git commit-graph write --reachable &&
		git -c core.commitGraph=false --no-replace-objects log >expect &&
		git -c core.commitGraph=true --no-replace-objects log >actual &&
		test_cmp expect actual &&
		rm -rf .git/objects/info/commit-graph &&
		git commit-graph write --reachable &&
		test_path_is_file .git/objects/info/commit-graph
	)
'
 
test_expect_success 'commit grafts invalidate commit-graph' '
	cd "$TRASH_DIRECTORY" &&
	test_when_finished rm -rf graft &&
	git clone full graft &&
	(
		cd graft &&
		git commit-graph write --reachable &&
		test_path_is_file .git/objects/info/commit-graph &&
		H1=$(git rev-parse --verify HEAD~1) &&
		H3=$(git rev-parse --verify HEAD~3) &&
		echo "$H1 $H3" >.git/info/grafts &&
		git -c core.commitGraph=false log >expect &&
		git -c core.commitGraph=true log >actual &&
		test_cmp expect actual &&
		git commit-graph write --reachable &&
		git -c core.commitGraph=false --no-replace-objects log >expect &&
		git -c core.commitGraph=true --no-replace-objects log >actual &&
		test_cmp expect actual &&
		rm -rf .git/objects/info/commit-graph &&
		git commit-graph write --reachable &&
		test_path_is_missing .git/objects/info/commit-graph
	)
'
 
test_expect_success 'replace-objects invalidates commit-graph' '
	cd "$TRASH_DIRECTORY" &&
	test_when_finished rm -rf shallow &&
	git clone --depth 2 "file://$TRASH_DIRECTORY/full" shallow &&
	(
		cd shallow &&
		git commit-graph write --reachable &&
		test_path_is_missing .git/objects/info/commit-graph &&
		git fetch origin --unshallow &&
		git commit-graph write --reachable &&
		test_path_is_file .git/objects/info/commit-graph
	)
'
 
# the verify tests below expect the commit-graph to contain
# exactly the commits reachable from the commits/8 branch.
# If the file changes the set of commits in the list, then the
# offsets into the binary file will result in different edits
# and the tests will likely break.
 
test_expect_success 'git commit-graph verify' '
	cd "$TRASH_DIRECTORY/full" &&
	git rev-parse commits/8 | git commit-graph write --stdin-commits &&
	git commit-graph verify >output
'
 
NUM_COMMITS=9
NUM_OCTOPUS_EDGES=2
HASH_LEN="$(test_oid rawsz)"
GRAPH_BYTE_VERSION=4
GRAPH_BYTE_HASH=5
GRAPH_BYTE_CHUNK_COUNT=6
GRAPH_CHUNK_LOOKUP_OFFSET=8
GRAPH_CHUNK_LOOKUP_WIDTH=12
GRAPH_CHUNK_LOOKUP_ROWS=5
GRAPH_BYTE_OID_FANOUT_ID=$GRAPH_CHUNK_LOOKUP_OFFSET
GRAPH_BYTE_OID_LOOKUP_ID=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
			    1 * $GRAPH_CHUNK_LOOKUP_WIDTH))
GRAPH_BYTE_COMMIT_DATA_ID=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
			     2 * $GRAPH_CHUNK_LOOKUP_WIDTH))
GRAPH_FANOUT_OFFSET=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
		       $GRAPH_CHUNK_LOOKUP_WIDTH * $GRAPH_CHUNK_LOOKUP_ROWS))
GRAPH_BYTE_FANOUT1=$(($GRAPH_FANOUT_OFFSET + 4 * 4))
GRAPH_BYTE_FANOUT2=$(($GRAPH_FANOUT_OFFSET + 4 * 255))
GRAPH_OID_LOOKUP_OFFSET=$(($GRAPH_FANOUT_OFFSET + 4 * 256))
GRAPH_BYTE_OID_LOOKUP_ORDER=$(($GRAPH_OID_LOOKUP_OFFSET + $HASH_LEN * 8))
GRAPH_BYTE_OID_LOOKUP_MISSING=$(($GRAPH_OID_LOOKUP_OFFSET + $HASH_LEN * 4 + 10))
GRAPH_COMMIT_DATA_OFFSET=$(($GRAPH_OID_LOOKUP_OFFSET + $HASH_LEN * $NUM_COMMITS))
GRAPH_BYTE_COMMIT_TREE=$GRAPH_COMMIT_DATA_OFFSET
GRAPH_BYTE_COMMIT_PARENT=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN))
GRAPH_BYTE_COMMIT_EXTRA_PARENT=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN + 4))
GRAPH_BYTE_COMMIT_WRONG_PARENT=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN + 3))
GRAPH_BYTE_COMMIT_GENERATION=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN + 11))
GRAPH_BYTE_COMMIT_DATE=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN + 12))
GRAPH_COMMIT_DATA_WIDTH=$(($HASH_LEN + 16))
GRAPH_OCTOPUS_DATA_OFFSET=$(($GRAPH_COMMIT_DATA_OFFSET + \
			     $GRAPH_COMMIT_DATA_WIDTH * $NUM_COMMITS))
GRAPH_BYTE_OCTOPUS=$(($GRAPH_OCTOPUS_DATA_OFFSET + 4))
GRAPH_BYTE_FOOTER=$(($GRAPH_OCTOPUS_DATA_OFFSET + 4 * $NUM_OCTOPUS_EDGES))
 
corrupt_graph_setup() {
	cd "$TRASH_DIRECTORY/full" &&
	test_when_finished mv commit-graph-backup $objdir/info/commit-graph &&
	cp $objdir/info/commit-graph commit-graph-backup
}
 
corrupt_graph_verify() {
	grepstr=$1
	test_must_fail git commit-graph verify 2>test_err &&
	grep -v "^+" test_err >err &&
	test_i18ngrep "$grepstr" err &&
	if test "$2" != "no-copy"
	then
		cp $objdir/info/commit-graph commit-graph-pre-write-test
	fi &&
	git status --short &&
	GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD=true git commit-graph write &&
	git commit-graph verify
}
 
# usage: corrupt_graph_and_verify <position> <data> <string> [<zero_pos>]
# Manipulates the commit-graph file at the position
# by inserting the data, optionally zeroing the file
# starting at <zero_pos>, then runs 'git commit-graph verify'
# and places the output in the file 'err'. Test 'err' for
# the given string.
corrupt_graph_and_verify() {
	pos=$1
	data="${2:-\0}"
	grepstr=$3
	corrupt_graph_setup &&
	orig_size=$(wc -c < $objdir/info/commit-graph) &&
	zero_pos=${4:-${orig_size}} &&
	printf "$data" | dd of="$objdir/info/commit-graph" bs=1 seek="$pos" conv=notrunc &&
	dd of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" if=/dev/null &&
	generate_zero_bytes $(($orig_size - $zero_pos)) >>"$objdir/info/commit-graph" &&
	corrupt_graph_verify "$grepstr"
 
}
 
test_expect_success POSIXPERM,SANITY 'detect permission problem' '
	corrupt_graph_setup &&
	chmod 000 $objdir/info/commit-graph &&
	corrupt_graph_verify "Could not open" "no-copy"
'
 
test_expect_success 'detect too small' '
	corrupt_graph_setup &&
	echo "a small graph" >$objdir/info/commit-graph &&
	corrupt_graph_verify "too small"
'
 
test_expect_success 'detect bad signature' '
	corrupt_graph_and_verify 0 "\0" \
		"graph signature"
'
 
test_expect_success 'detect bad version' '
	corrupt_graph_and_verify $GRAPH_BYTE_VERSION "\02" \
		"graph version"
'
 
test_expect_success 'detect bad hash version' '
	corrupt_graph_and_verify $GRAPH_BYTE_HASH "\02" \
		"hash version"
'
 
test_expect_success 'detect low chunk count' '
	corrupt_graph_and_verify $GRAPH_BYTE_CHUNK_COUNT "\02" \
		"missing the .* chunk"
'
 
test_expect_success 'detect missing OID fanout chunk' '
	corrupt_graph_and_verify $GRAPH_BYTE_OID_FANOUT_ID "\0" \
		"missing the OID Fanout chunk"
'
 
test_expect_success 'detect missing OID lookup chunk' '
	corrupt_graph_and_verify $GRAPH_BYTE_OID_LOOKUP_ID "\0" \
		"missing the OID Lookup chunk"
'
 
test_expect_success 'detect missing commit data chunk' '
	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_DATA_ID "\0" \
		"missing the Commit Data chunk"
'
 
test_expect_success 'detect incorrect fanout' '
	corrupt_graph_and_verify $GRAPH_BYTE_FANOUT1 "\01" \
		"fanout value"
'
 
test_expect_success 'detect incorrect fanout final value' '
	corrupt_graph_and_verify $GRAPH_BYTE_FANOUT2 "\01" \
		"fanout value"
'
 
test_expect_success 'detect incorrect OID order' '
	corrupt_graph_and_verify $GRAPH_BYTE_OID_LOOKUP_ORDER "\01" \
		"incorrect OID order"
'
 
test_expect_success 'detect OID not in object database' '
	corrupt_graph_and_verify $GRAPH_BYTE_OID_LOOKUP_MISSING "\01" \
		"from object database"
'
 
test_expect_success 'detect incorrect tree OID' '
	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_TREE "\01" \
		"root tree OID for commit"
'
 
test_expect_success 'detect incorrect parent int-id' '
	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_PARENT "\01" \
		"invalid parent"
'
 
test_expect_success 'detect extra parent int-id' '
	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_EXTRA_PARENT "\00" \
		"is too long"
'
 
test_expect_success 'detect wrong parent' '
	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_WRONG_PARENT "\01" \
		"commit-graph parent for"
'
 
test_expect_success 'detect incorrect generation number' '
	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_GENERATION "\070" \
		"generation for commit"
'
 
test_expect_success 'detect incorrect generation number' '
	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_GENERATION "\01" \
		"non-zero generation number"
'
 
test_expect_success 'detect incorrect commit date' '
	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_DATE "\01" \
		"commit date"
'
 
test_expect_success 'detect incorrect parent for octopus merge' '
	corrupt_graph_and_verify $GRAPH_BYTE_OCTOPUS "\01" \
		"invalid parent"
'
 
test_expect_success 'detect invalid checksum hash' '
	corrupt_graph_and_verify $GRAPH_BYTE_FOOTER "\00" \
		"incorrect checksum"
'
 
test_expect_success 'detect incorrect chunk count' '
	corrupt_graph_and_verify $GRAPH_BYTE_CHUNK_COUNT "\377" \
		"chunk lookup table entry missing" $GRAPH_CHUNK_LOOKUP_OFFSET
'
 
test_expect_success 'git fsck (checks commit-graph)' '
	cd "$TRASH_DIRECTORY/full" &&
	git fsck &&
	corrupt_graph_and_verify $GRAPH_BYTE_FOOTER "\00" \
		"incorrect checksum" &&
	cp commit-graph-pre-write-test $objdir/info/commit-graph &&
	test_must_fail git fsck
'
 
test_expect_success 'setup non-the_repository tests' '
	rm -rf repo &&
	git init repo &&
	test_commit -C repo one &&
	test_commit -C repo two &&
	git -C repo config core.commitGraph true &&
	git -C repo rev-parse two | \
		git -C repo commit-graph write --stdin-commits
'
 
test_expect_success 'parse_commit_in_graph works for non-the_repository' '
	test-tool repository parse_commit_in_graph \
		repo/.git repo "$(git -C repo rev-parse two)" >actual &&
	{
		git -C repo log --pretty=format:"%ct " -1 &&
		git -C repo rev-parse one
	} >expect &&
	test_cmp expect actual &&
 
	test-tool repository parse_commit_in_graph \
		repo/.git repo "$(git -C repo rev-parse one)" >actual &&
	git -C repo log --pretty="%ct" -1 one >expect &&
	test_cmp expect actual
'
 
test_expect_success 'get_commit_tree_in_graph works for non-the_repository' '
	test-tool repository get_commit_tree_in_graph \
		repo/.git repo "$(git -C repo rev-parse two)" >actual &&
	git -C repo rev-parse two^{tree} >expect &&
	test_cmp expect actual &&
 
	test-tool repository get_commit_tree_in_graph \
		repo/.git repo "$(git -C repo rev-parse one)" >actual &&
	git -C repo rev-parse one^{tree} >expect &&
	test_cmp expect actual
'
 
test_expect_success 'corrupt commit-graph write (broken parent)' '
	rm -rf repo &&
	git init repo &&
	(
		cd repo &&
		empty="$(git mktree </dev/null)" &&
		cat >broken <<-EOF &&
		tree $empty
		parent 0000000000000000000000000000000000000000
		author whatever <whatever@example.com> 1234 -0000
		committer whatever <whatever@example.com> 1234 -0000
 
		broken commit
		EOF
		broken="$(git hash-object -w -t commit --literally broken)" &&
		git commit-tree -p "$broken" -m "good commit" "$empty" >good &&
		test_must_fail git commit-graph write --stdin-commits \
			<good 2>test_err &&
		test_i18ngrep "unable to parse commit" test_err
	)
'
 
test_expect_success 'corrupt commit-graph write (missing tree)' '
	rm -rf repo &&
	git init repo &&
	(
		cd repo &&
		tree="$(git mktree </dev/null)" &&
		cat >broken <<-EOF &&
		parent 0000000000000000000000000000000000000000
		author whatever <whatever@example.com> 1234 -0000
		committer whatever <whatever@example.com> 1234 -0000
 
		broken commit
		EOF
		broken="$(git hash-object -w -t commit --literally broken)" &&
		git commit-tree -p "$broken" -m "good" "$tree" >good &&
		test_must_fail git commit-graph write --stdin-commits \
			<good 2>test_err &&
		test_i18ngrep "unable to parse commit" test_err
	)
'
 
test_done