aboutsummaryrefslogtreecommitdiff
path: root/t/t1450-fsck.sh
blob: cb4b66e29dd8c38c734f5d29df3e8062c78884a9 (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
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
#!/bin/sh

test_description='git fsck random collection of tests

* (HEAD) B
* (master) A
'

. ./test-lib.sh

test_expect_success setup '
	git config gc.auto 0 &&
	git config i18n.commitencoding ISO-8859-1 &&
	test_commit A fileA one &&
	git config --unset i18n.commitencoding &&
	git checkout HEAD^0 &&
	test_commit B fileB two &&
	git tag -d A B &&
	git reflog expire --expire=now --all &&
	>empty
'

test_expect_success 'loose objects borrowed from alternate are not missing' '
	mkdir another &&
	(
		cd another &&
		git init &&
		echo ../../../.git/objects >.git/objects/info/alternates &&
		test_commit C fileC one &&
		git fsck --no-dangling >../actual 2>&1
	) &&
	test_cmp empty actual
'

test_expect_success 'HEAD is part of refs, valid objects appear valid' '
	git fsck >actual 2>&1 &&
	test_cmp empty actual
'

# Corruption tests follow.  Make sure to remove all traces of the
# specific corruption you test afterwards, lest a later test trip over
# it.

test_expect_success 'setup: helpers for corruption tests' '
	sha1_file() {
		remainder=${1#??} &&
		firsttwo=${1%$remainder} &&
		echo ".git/objects/$firsttwo/$remainder"
	} &&

	remove_object() {
		rm "$(sha1_file "$1")"
	}
'

test_expect_success 'object with bad sha1' '
	sha=$(echo blob | git hash-object -w --stdin) &&
	old=$(echo $sha | sed "s+^..+&/+") &&
	new=$(dirname $old)/ffffffffffffffffffffffffffffffffffffff &&
	sha="$(dirname $new)$(basename $new)" &&
	mv .git/objects/$old .git/objects/$new &&
	test_when_finished "remove_object $sha" &&
	git update-index --add --cacheinfo 100644 $sha foo &&
	test_when_finished "git read-tree -u --reset HEAD" &&
	tree=$(git write-tree) &&
	test_when_finished "remove_object $tree" &&
	cmt=$(echo bogus | git commit-tree $tree) &&
	test_when_finished "remove_object $cmt" &&
	git update-ref refs/heads/bogus $cmt &&
	test_when_finished "git update-ref -d refs/heads/bogus" &&

	test_must_fail git fsck 2>out &&
	cat out &&
	grep "$sha.*corrupt" out
'

test_expect_success 'branch pointing to non-commit' '
	git rev-parse HEAD^{tree} >.git/refs/heads/invalid &&
	test_when_finished "git update-ref -d refs/heads/invalid" &&
	test_must_fail git fsck 2>out &&
	cat out &&
	grep "not a commit" out
'

test_expect_success 'HEAD link pointing at a funny object' '
	test_when_finished "mv .git/SAVED_HEAD .git/HEAD" &&
	mv .git/HEAD .git/SAVED_HEAD &&
	echo 0000000000000000000000000000000000000000 >.git/HEAD &&
	# avoid corrupt/broken HEAD from interfering with repo discovery
	test_must_fail env GIT_DIR=.git git fsck 2>out &&
	cat out &&
	grep "detached HEAD points" out
'

test_expect_success 'HEAD link pointing at a funny place' '
	test_when_finished "mv .git/SAVED_HEAD .git/HEAD" &&
	mv .git/HEAD .git/SAVED_HEAD &&
	echo "ref: refs/funny/place" >.git/HEAD &&
	# avoid corrupt/broken HEAD from interfering with repo discovery
	test_must_fail env GIT_DIR=.git git fsck 2>out &&
	cat out &&
	grep "HEAD points to something strange" out
'

test_expect_success 'email without @ is okay' '
	git cat-file commit HEAD >basis &&
	sed "s/@/AT/" basis >okay &&
	new=$(git hash-object -t commit -w --stdin <okay) &&
	test_when_finished "remove_object $new" &&
	git update-ref refs/heads/bogus "$new" &&
	test_when_finished "git update-ref -d refs/heads/bogus" &&
	git fsck 2>out &&
	cat out &&
	! grep "commit $new" out
'

test_expect_success 'email with embedded > is not okay' '
	git cat-file commit HEAD >basis &&
	sed "s/@[a-z]/&>/" basis >bad-email &&
	new=$(git hash-object -t commit -w --stdin <bad-email) &&
	test_when_finished "remove_object $new" &&
	git update-ref refs/heads/bogus "$new" &&
	test_when_finished "git update-ref -d refs/heads/bogus" &&
	test_must_fail git fsck 2>out &&
	cat out &&
	grep "error in commit $new" out
'

test_expect_success 'missing < email delimiter is reported nicely' '
	git cat-file commit HEAD >basis &&
	sed "s/<//" basis >bad-email-2 &&
	new=$(git hash-object -t commit -w --stdin <bad-email-2) &&
	test_when_finished "remove_object $new" &&
	git update-ref refs/heads/bogus "$new" &&
	test_when_finished "git update-ref -d refs/heads/bogus" &&
	test_must_fail git fsck 2>out &&
	cat out &&
	grep "error in commit $new.* - bad name" out
'

test_expect_success 'missing email is reported nicely' '
	git cat-file commit HEAD >basis &&
	sed "s/[a-z]* <[^>]*>//" basis >bad-email-3 &&
	new=$(git hash-object -t commit -w --stdin <bad-email-3) &&
	test_when_finished "remove_object $new" &&
	git update-ref refs/heads/bogus "$new" &&
	test_when_finished "git update-ref -d refs/heads/bogus" &&
	test_must_fail git fsck 2>out &&
	cat out &&
	grep "error in commit $new.* - missing email" out
'

test_expect_success '> in name is reported' '
	git cat-file commit HEAD >basis &&
	sed "s/ </> </" basis >bad-email-4 &&
	new=$(git hash-object -t commit -w --stdin <bad-email-4) &&
	test_when_finished "remove_object $new" &&
	git update-ref refs/heads/bogus "$new" &&
	test_when_finished "git update-ref -d refs/heads/bogus" &&
	test_must_fail git fsck 2>out &&
	cat out &&
	grep "error in commit $new" out
'

# date is 2^64 + 1
test_expect_success 'integer overflow in timestamps is reported' '
	git cat-file commit HEAD >basis &&
	sed "s/^\\(author .*>\\) [0-9]*/\\1 18446744073709551617/" \
		<basis >bad-timestamp &&
	new=$(git hash-object -t commit -w --stdin <bad-timestamp) &&
	test_when_finished "remove_object $new" &&
	git update-ref refs/heads/bogus "$new" &&
	test_when_finished "git update-ref -d refs/heads/bogus" &&
	test_must_fail git fsck 2>out &&
	cat out &&
	grep "error in commit $new.*integer overflow" out
'

test_expect_success 'commit with NUL in header' '
	git cat-file commit HEAD >basis &&
	sed "s/author ./author Q/" <basis | q_to_nul >commit-NUL-header &&
	new=$(git hash-object -t commit -w --stdin <commit-NUL-header) &&
	test_when_finished "remove_object $new" &&
	git update-ref refs/heads/bogus "$new" &&
	test_when_finished "git update-ref -d refs/heads/bogus" &&
	test_must_fail git fsck 2>out &&
	cat out &&
	grep "error in commit $new.*unterminated header: NUL at offset" out
'

test_expect_success 'tree object with duplicate entries' '
	test_when_finished "for i in \$T; do remove_object \$i; done" &&
	T=$(
		GIT_INDEX_FILE=test-index &&
		export GIT_INDEX_FILE &&
		rm -f test-index &&
		>x &&
		git add x &&
		git rev-parse :x &&
		T=$(git write-tree) &&
		echo $T &&
		(
			git cat-file tree $T &&
			git cat-file tree $T
		) |
		git hash-object -w -t tree --stdin
	) &&
	test_must_fail git fsck 2>out &&
	grep "error in tree .*contains duplicate file entries" out
'

test_expect_success 'unparseable tree object' '
	test_when_finished "git update-ref -d refs/heads/wrong" &&
	test_when_finished "remove_object \$tree_sha1" &&
	test_when_finished "remove_object \$commit_sha1" &&
	tree_sha1=$(printf "100644 \0twenty-bytes-of-junk" | git hash-object -t tree --stdin -w --literally) &&
	commit_sha1=$(git commit-tree $tree_sha1) &&
	git update-ref refs/heads/wrong $commit_sha1 &&
	test_must_fail git fsck 2>out &&
	test_i18ngrep "error: empty filename in tree entry" out &&
	test_i18ngrep "$tree_sha1" out &&
	test_i18ngrep ! "fatal: empty filename in tree entry" out
'

hex2oct() {
	perl -ne 'printf "\\%03o", hex for /../g'
}

test_expect_success 'tree entry with type mismatch' '
	test_when_finished "remove_object \$blob" &&
	test_when_finished "remove_object \$tree" &&
	test_when_finished "remove_object \$commit" &&
	test_when_finished "git update-ref -d refs/heads/type_mismatch" &&
	blob=$(echo blob | git hash-object -w --stdin) &&
	blob_bin=$(echo $blob | hex2oct) &&
	tree=$(
		printf "40000 dir\0${blob_bin}100644 file\0${blob_bin}" |
		git hash-object -t tree --stdin -w --literally
	) &&
	commit=$(git commit-tree $tree) &&
	git update-ref refs/heads/type_mismatch $commit &&
	test_must_fail git fsck >out 2>&1 &&
	test_i18ngrep "is a blob, not a tree" out &&
	test_i18ngrep ! "dangling blob" out
'

test_expect_success 'tag pointing to nonexistent' '
	cat >invalid-tag <<-\EOF &&
	object ffffffffffffffffffffffffffffffffffffffff
	type commit
	tag invalid
	tagger T A Gger <tagger@example.com> 1234567890 -0000

	This is an invalid tag.
	EOF

	tag=$(git hash-object -t tag -w --stdin <invalid-tag) &&
	test_when_finished "remove_object $tag" &&
	echo $tag >.git/refs/tags/invalid &&
	test_when_finished "git update-ref -d refs/tags/invalid" &&
	test_must_fail git fsck --tags >out &&
	cat out &&
	grep "broken link" out
'

test_expect_success 'tag pointing to something else than its type' '
	sha=$(echo blob | git hash-object -w --stdin) &&
	test_when_finished "remove_object $sha" &&
	cat >wrong-tag <<-EOF &&
	object $sha
	type commit
	tag wrong
	tagger T A Gger <tagger@example.com> 1234567890 -0000

	This is an invalid tag.
	EOF

	tag=$(git hash-object -t tag -w --stdin <wrong-tag) &&
	test_when_finished "remove_object $tag" &&
	echo $tag >.git/refs/tags/wrong &&
	test_when_finished "git update-ref -d refs/tags/wrong" &&
	test_must_fail git fsck --tags
'

test_expect_success 'tag with incorrect tag name & missing tagger' '
	sha=$(git rev-parse HEAD) &&
	cat >wrong-tag <<-EOF &&
	object $sha
	type commit
	tag wrong name format

	This is an invalid tag.
	EOF

	tag=$(git hash-object -t tag -w --stdin <wrong-tag) &&
	test_when_finished "remove_object $tag" &&
	echo $tag >.git/refs/tags/wrong &&
	test_when_finished "git update-ref -d refs/tags/wrong" &&
	git fsck --tags 2>out &&

	cat >expect <<-EOF &&
	warning in tag $tag: badTagName: invalid '\''tag'\'' name: wrong name format
	warning in tag $tag: missingTaggerEntry: invalid format - expected '\''tagger'\'' line
	EOF
	test_cmp expect out
'

test_expect_success 'tag with bad tagger' '
	sha=$(git rev-parse HEAD) &&
	cat >wrong-tag <<-EOF &&
	object $sha
	type commit
	tag not-quite-wrong
	tagger Bad Tagger Name

	This is an invalid tag.
	EOF

	tag=$(git hash-object --literally -t tag -w --stdin <wrong-tag) &&
	test_when_finished "remove_object $tag" &&
	echo $tag >.git/refs/tags/wrong &&
	test_when_finished "git update-ref -d refs/tags/wrong" &&
	test_must_fail git fsck --tags 2>out &&
	grep "error in tag .*: invalid author/committer" out
'

test_expect_success 'tag with NUL in header' '
	sha=$(git rev-parse HEAD) &&
	q_to_nul >tag-NUL-header <<-EOF &&
	object $sha
	type commit
	tag contains-Q-in-header
	tagger T A Gger <tagger@example.com> 1234567890 -0000

	This is an invalid tag.
	EOF

	tag=$(git hash-object --literally -t tag -w --stdin <tag-NUL-header) &&
	test_when_finished "remove_object $tag" &&
	echo $tag >.git/refs/tags/wrong &&
	test_when_finished "git update-ref -d refs/tags/wrong" &&
	test_must_fail git fsck --tags 2>out &&
	cat out &&
	grep "error in tag $tag.*unterminated header: NUL at offset" out
'

test_expect_success 'cleaned up' '
	git fsck >actual 2>&1 &&
	test_cmp empty actual
'

test_expect_success 'rev-list --verify-objects' '
	git rev-list --verify-objects --all >/dev/null 2>out &&
	test_cmp empty out
'

test_expect_success 'rev-list --verify-objects with bad sha1' '
	sha=$(echo blob | git hash-object -w --stdin) &&
	old=$(echo $sha | sed "s+^..+&/+") &&
	new=$(dirname $old)/ffffffffffffffffffffffffffffffffffffff &&
	sha="$(dirname $new)$(basename $new)" &&
	mv .git/objects/$old .git/objects/$new &&
	test_when_finished "remove_object $sha" &&
	git update-index --add --cacheinfo 100644 $sha foo &&
	test_when_finished "git read-tree -u --reset HEAD" &&
	tree=$(git write-tree) &&
	test_when_finished "remove_object $tree" &&
	cmt=$(echo bogus | git commit-tree $tree) &&
	test_when_finished "remove_object $cmt" &&
	git update-ref refs/heads/bogus $cmt &&
	test_when_finished "git update-ref -d refs/heads/bogus" &&

	test_might_fail git rev-list --verify-objects refs/heads/bogus >/dev/null 2>out &&
	cat out &&
	grep -q "error: sha1 mismatch 63ffffffffffffffffffffffffffffffffffffff" out
'

test_expect_success 'force fsck to ignore double author' '
	git cat-file commit HEAD >basis &&
	sed "s/^author .*/&,&/" <basis | tr , \\n >multiple-authors &&
	new=$(git hash-object -t commit -w --stdin <multiple-authors) &&
	test_when_finished "remove_object $new" &&
	git update-ref refs/heads/bogus "$new" &&
	test_when_finished "git update-ref -d refs/heads/bogus" &&
	test_must_fail git fsck &&
	git -c fsck.multipleAuthors=ignore fsck
'

_bz='\0'
_bz5="$_bz$_bz$_bz$_bz$_bz"
_bz20="$_bz5$_bz5$_bz5$_bz5"

test_expect_success 'fsck notices blob entry pointing to null sha1' '
	(git init null-blob &&
	 cd null-blob &&
	 sha=$(printf "100644 file$_bz$_bz20" |
	       git hash-object -w --stdin -t tree) &&
	  git fsck 2>out &&
	  cat out &&
	  grep "warning.*null sha1" out
	)
'

test_expect_success 'fsck notices submodule entry pointing to null sha1' '
	(git init null-commit &&
	 cd null-commit &&
	 sha=$(printf "160000 submodule$_bz$_bz20" |
	       git hash-object -w --stdin -t tree) &&
	  git fsck 2>out &&
	  cat out &&
	  grep "warning.*null sha1" out
	)
'

while read name path pretty; do
	while read mode type; do
		: ${pretty:=$path}
		test_expect_success "fsck notices $pretty as $type" '
		(
			git init $name-$type &&
			cd $name-$type &&
			echo content >file &&
			git add file &&
			git commit -m base &&
			blob=$(git rev-parse :file) &&
			tree=$(git rev-parse HEAD^{tree}) &&
			value=$(eval "echo \$$type") &&
			printf "$mode $type %s\t%s" "$value" "$path" >bad &&
			bad_tree=$(git mktree <bad) &&
			git fsck 2>out &&
			cat out &&
			grep "warning.*tree $bad_tree" out
		)'
	done <<-\EOF
	100644 blob
	040000 tree
	EOF
done <<-EOF
dot .
dotdot ..
dotgit .git
dotgit-case .GIT
dotgit-unicode .gI${u200c}T .gI{u200c}T
dotgit-case2 .Git
git-tilde1 git~1
dotgitdot .git.
dot-backslash-case .\\\\.GIT\\\\foobar
dotgit-case-backslash .git\\\\foobar
EOF

test_expect_success 'fsck allows .Ňit' '
	(
		git init not-dotgit &&
		cd not-dotgit &&
		echo content >file &&
		git add file &&
		git commit -m base &&
		blob=$(git rev-parse :file) &&
		printf "100644 blob $blob\t.\\305\\207it" >tree &&
		tree=$(git mktree <tree) &&
		git fsck 2>err &&
		test_line_count = 0 err
	)
'

test_expect_success 'NUL in commit' '
	rm -fr nul-in-commit &&
	git init nul-in-commit &&
	(
		cd nul-in-commit &&
		git commit --allow-empty -m "initial commitQNUL after message" &&
		git cat-file commit HEAD >original &&
		q_to_nul <original >munged &&
		git hash-object -w -t commit --stdin <munged >name &&
		git branch bad $(cat name) &&

		test_must_fail git -c fsck.nulInCommit=error fsck 2>warn.1 &&
		grep nulInCommit warn.1 &&
		git fsck 2>warn.2 &&
		grep nulInCommit warn.2
	)
'

# create a static test repo which is broken by omitting
# one particular object ($1, which is looked up via rev-parse
# in the new repository).
create_repo_missing () {
	rm -rf missing &&
	git init missing &&
	(
		cd missing &&
		git commit -m one --allow-empty &&
		mkdir subdir &&
		echo content >subdir/file &&
		git add subdir/file &&
		git commit -m two &&
		unrelated=$(echo unrelated | git hash-object --stdin -w) &&
		git tag -m foo tag $unrelated &&
		sha1=$(git rev-parse --verify "$1") &&
		path=$(echo $sha1 | sed 's|..|&/|') &&
		rm .git/objects/$path
	)
}

test_expect_success 'fsck notices missing blob' '
	create_repo_missing HEAD:subdir/file &&
	test_must_fail git -C missing fsck
'

test_expect_success 'fsck notices missing subtree' '
	create_repo_missing HEAD:subdir &&
	test_must_fail git -C missing fsck
'

test_expect_success 'fsck notices missing root tree' '
	create_repo_missing HEAD^{tree} &&
	test_must_fail git -C missing fsck
'

test_expect_success 'fsck notices missing parent' '
	create_repo_missing HEAD^ &&
	test_must_fail git -C missing fsck
'

test_expect_success 'fsck notices missing tagged object' '
	create_repo_missing tag^{blob} &&
	test_must_fail git -C missing fsck
'

test_expect_success 'fsck notices ref pointing to missing commit' '
	create_repo_missing HEAD &&
	test_must_fail git -C missing fsck
'

test_expect_success 'fsck notices ref pointing to missing tag' '
	create_repo_missing tag &&
	test_must_fail git -C missing fsck
'

test_expect_success 'fsck --connectivity-only' '
	rm -rf connectivity-only &&
	git init connectivity-only &&
	(
		cd connectivity-only &&
		touch empty &&
		git add empty &&
		test_commit empty &&

		# Drop the index now; we want to be sure that we
		# recursively notice the broken objects
		# because they are reachable from refs, not because
		# they are in the index.
		rm -f .git/index &&

		# corrupt the blob, but in a way that we can still identify
		# its type. That lets us see that --connectivity-only is
		# not actually looking at the contents, but leaves it
		# free to examine the type if it chooses.
		empty=.git/objects/e6/9de29bb2d1d6434b8b29ae775ad8c2e48c5391 &&
		blob=$(echo unrelated | git hash-object -w --stdin) &&
		mv -f $(sha1_file $blob) $empty &&

		test_must_fail git fsck --strict &&
		git fsck --strict --connectivity-only &&
		tree=$(git rev-parse HEAD:) &&
		suffix=${tree#??} &&
		tree=.git/objects/${tree%$suffix}/$suffix &&
		rm -f $tree &&
		echo invalid >$tree &&
		test_must_fail git fsck --strict --connectivity-only
	)
'

test_expect_success 'fsck --connectivity-only with explicit head' '
	rm -rf connectivity-only &&
	git init connectivity-only &&
	(
		cd connectivity-only &&
		test_commit foo &&
		rm -f .git/index &&
		tree=$(git rev-parse HEAD^{tree}) &&
		remove_object $(git rev-parse HEAD:foo.t) &&
		test_must_fail git fsck --connectivity-only $tree
	)
'

test_expect_success 'fsck --name-objects' '
	rm -rf name-objects &&
	git init name-objects &&
	(
		cd name-objects &&
		test_commit julius caesar.t &&
		test_commit augustus &&
		test_commit caesar &&
		remove_object $(git rev-parse julius:caesar.t) &&
		test_must_fail git fsck --name-objects >out &&
		tree=$(git rev-parse --verify julius:) &&
		egrep "$tree \((refs/heads/master|HEAD)@\{[0-9]*\}:" out
	)
'

test_expect_success 'alternate objects are correctly blamed' '
	test_when_finished "rm -rf alt.git .git/objects/info/alternates" &&
	git init --bare alt.git &&
	echo "../../alt.git/objects" >.git/objects/info/alternates &&
	mkdir alt.git/objects/12 &&
	>alt.git/objects/12/34567890123456789012345678901234567890 &&
	test_must_fail git fsck >out 2>&1 &&
	grep alt.git out
'

test_expect_success 'fsck errors in packed objects' '
	git cat-file commit HEAD >basis &&
	sed "s/</one/" basis >one &&
	sed "s/</foo/" basis >two &&
	one=$(git hash-object -t commit -w one) &&
	two=$(git hash-object -t commit -w two) &&
	pack=$(
		{
			echo $one &&
			echo $two
		} | git pack-objects .git/objects/pack/pack
	) &&
	test_when_finished "rm -f .git/objects/pack/pack-$pack.*" &&
	remove_object $one &&
	remove_object $two &&
	test_must_fail git fsck 2>out &&
	grep "error in commit $one.* - bad name" out &&
	grep "error in commit $two.* - bad name" out &&
	! grep corrupt out
'

test_expect_success 'fsck fails on corrupt packfile' '
	hsh=$(git commit-tree -m mycommit HEAD^{tree}) &&
	pack=$(echo $hsh | git pack-objects .git/objects/pack/pack) &&

	# Corrupt the first byte of the first object. (It contains 3 type bits,
	# at least one of which is not zero, so setting the first byte to 0 is
	# sufficient.)
	chmod a+w .git/objects/pack/pack-$pack.pack &&
	printf '\0' | dd of=.git/objects/pack/pack-$pack.pack bs=1 conv=notrunc seek=12 &&

	test_when_finished "rm -f .git/objects/pack/pack-$pack.*" &&
	remove_object $hsh &&
	test_must_fail git fsck 2>out &&
	test_i18ngrep "checksum mismatch" out
'

test_expect_success 'fsck finds problems in duplicate loose objects' '
	rm -rf broken-duplicate &&
	git init broken-duplicate &&
	(
		cd broken-duplicate &&
		test_commit duplicate &&
		# no "-d" here, so we end up with duplicates
		git repack &&
		# now corrupt the loose copy
		file=$(sha1_file "$(git rev-parse HEAD)") &&
		rm "$file" &&
		echo broken >"$file" &&
		test_must_fail git fsck
	)
'

test_expect_success 'fsck detects trailing loose garbage (commit)' '
	git cat-file commit HEAD >basis &&
	echo bump-commit-sha1 >>basis &&
	commit=$(git hash-object -w -t commit basis) &&
	file=$(sha1_file $commit) &&
	test_when_finished "remove_object $commit" &&
	chmod +w "$file" &&
	echo garbage >>"$file" &&
	test_must_fail git fsck 2>out &&
	test_i18ngrep "garbage.*$commit" out
'

test_expect_success 'fsck detects trailing loose garbage (blob)' '
	blob=$(echo trailing | git hash-object -w --stdin) &&
	file=$(sha1_file $blob) &&
	test_when_finished "remove_object $blob" &&
	chmod +w "$file" &&
	echo garbage >>"$file" &&
	test_must_fail git fsck 2>out &&
	test_i18ngrep "garbage.*$blob" out
'

# for each of type, we have one version which is referenced by another object
# (and so while unreachable, not dangling), and another variant which really is
# dangling.
test_expect_success 'fsck notices dangling objects' '
	git init dangling &&
	(
		cd dangling &&
		blob=$(echo not-dangling | git hash-object -w --stdin) &&
		dblob=$(echo dangling | git hash-object -w --stdin) &&
		tree=$(printf "100644 blob %s\t%s\n" $blob one | git mktree) &&
		dtree=$(printf "100644 blob %s\t%s\n" $blob two | git mktree) &&
		commit=$(git commit-tree $tree) &&
		dcommit=$(git commit-tree -p $commit $tree) &&

		cat >expect <<-EOF &&
		dangling blob $dblob
		dangling commit $dcommit
		dangling tree $dtree
		EOF

		git fsck >actual &&
		# the output order is non-deterministic, as it comes from a hash
		sort <actual >actual.sorted &&
		test_cmp expect actual.sorted
	)
'

test_expect_success 'fsck $name notices bogus $name' '
	test_must_fail git fsck bogus &&
	test_must_fail git fsck $_z40
'

test_expect_success 'bogus head does not fallback to all heads' '
	# set up a case that will cause a reachability complaint
	echo to-be-deleted >foo &&
	git add foo &&
	blob=$(git rev-parse :foo) &&
	test_when_finished "git rm --cached foo" &&
	remove_object $blob &&
	test_must_fail git fsck $_z40 >out 2>&1 &&
	! grep $blob out
'

# Corrupt the checksum on the index.
# Add 1 to the last byte in the SHA.
corrupt_index_checksum () {
    perl -w -e '
	use Fcntl ":seek";
	open my $fh, "+<", ".git/index" or die "open: $!";
	binmode $fh;
	seek $fh, -1, SEEK_END or die "seek: $!";
	read $fh, my $in_byte, 1 or die "read: $!";

	$in_value = unpack("C", $in_byte);
	$out_value = ($in_value + 1) & 255;

	$out_byte = pack("C", $out_value);

	seek $fh, -1, SEEK_END or die "seek: $!";
	print $fh $out_byte;
	close $fh or die "close: $!";
    '
}

# Corrupt the checksum on the index and then
# verify that only fsck notices.
test_expect_success 'detect corrupt index file in fsck' '
	cp .git/index .git/index.backup &&
	test_when_finished "mv .git/index.backup .git/index" &&
	corrupt_index_checksum &&
	test_must_fail git fsck --cache 2>errors &&
	grep "bad index file" errors
'

test_done