merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

1 files changed, 834 insertions, 0 deletions

diff --git a/third_party/git/t/t1450-fsck.sh b/third_party/git/t/t1450-fsck.sh
new file mode 100755
index 000000000000..b36e0528d07b
--- /dev/null
+++ b/third_party/git/t/t1450-fsck.sh
@@ -0,0 +1,834 @@
+#!/bin/sh
+
+test_description='git fsck random collection of tests
+
+* (HEAD) B
+* (master) A
+'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+	test_oid_init &&
+	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
+'
+
+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_must_be_empty actual
+'
+
+test_expect_success 'HEAD is part of refs, valid objects appear valid' '
+	git fsck >actual 2>&1 &&
+	test_must_be_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=$(test_oid_to_path "$sha") &&
+	new=$(dirname $old)/$(test_oid ff_2) &&
+	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 $cmt &&
+	test_when_finished "git update-ref -d refs/heads/bogus" &&
+
+	test_must_fail git fsck 2>out &&
+	cat out &&
+	test_i18ngrep "$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 &&
+	test_i18ngrep "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 $ZERO_OID >.git/HEAD &&
+	# avoid corrupt/broken HEAD from interfering with repo discovery
+	test_must_fail env GIT_DIR=.git git fsck 2>out &&
+	cat out &&
+	test_i18ngrep "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 &&
+	test_i18ngrep "HEAD points to something strange" out
+'
+
+test_expect_success 'HEAD link pointing at a funny object (from different wt)' '
+	test_when_finished "mv .git/SAVED_HEAD .git/HEAD" &&
+	test_when_finished "rm -rf .git/worktrees wt" &&
+	git worktree add wt &&
+	mv .git/HEAD .git/SAVED_HEAD &&
+	echo $ZERO_OID >.git/HEAD &&
+	# avoid corrupt/broken HEAD from interfering with repo discovery
+	test_must_fail git -C wt fsck 2>out &&
+	test_i18ngrep "main-worktree/HEAD: detached HEAD points" out
+'
+
+test_expect_success 'other worktree HEAD link pointing at a funny object' '
+	test_when_finished "rm -rf .git/worktrees other" &&
+	git worktree add other &&
+	echo $ZERO_OID >.git/worktrees/other/HEAD &&
+	test_must_fail git fsck 2>out &&
+	test_i18ngrep "worktrees/other/HEAD: detached HEAD points" out
+'
+
+test_expect_success 'other worktree HEAD link pointing at missing object' '
+	test_when_finished "rm -rf .git/worktrees other" &&
+	git worktree add other &&
+	echo "Contents missing from repo" | git hash-object --stdin >.git/worktrees/other/HEAD &&
+	test_must_fail git fsck 2>out &&
+	test_i18ngrep "worktrees/other/HEAD: invalid sha1 pointer" out
+'
+
+test_expect_success 'other worktree HEAD link pointing at a funny place' '
+	test_when_finished "rm -rf .git/worktrees other" &&
+	git worktree add other &&
+	echo "ref: refs/funny/place" >.git/worktrees/other/HEAD &&
+	test_must_fail git fsck 2>out &&
+	test_i18ngrep "worktrees/other/HEAD points to something strange" out
+'
+
+test_expect_success 'email without @ is okay' '
+	git cat-file commit HEAD >basis &&
+	sed "s/@/AT/" basis >okay &&
+	new=$(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 &&
+	test_i18ngrep "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 &&
+	test_i18ngrep "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 &&
+	test_i18ngrep "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 &&
+	test_i18ngrep "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 &&
+	test_i18ngrep "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 &&
+	test_i18ngrep "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 $T
+		) |
+		git hash-object -w -t tree --stdin
+	) &&
+	test_must_fail git fsck 2>out &&
+	test_i18ngrep "error in tree .*contains duplicate file entries" out
+'
+
+test_expect_success 'unparseable tree object' '
+	test_oid_cache <<-\EOF &&
+	junk sha1:twenty-bytes-of-junk
+	junk sha256:twenty-bytes-of-junk-twelve-more
+	EOF
+
+	test_when_finished "git update-ref -d refs/heads/wrong" &&
+	test_when_finished "remove_object \$tree_sha1" &&
+	test_when_finished "remove_object \$commit_sha1" &&
+	junk=$(test_oid junk) &&
+	tree_sha1=$(printf "100644 \0$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
+'
+
+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 $commit &&
+	test_must_fail git fsck >out 2>&1 &&
+	test_i18ngrep "is a blob, not a tree" out &&
+	test_i18ngrep ! "dangling blob" out
+'
+
+test_expect_success 'tag pointing to nonexistent' '
+	badoid=$(test_oid deadbeef) &&
+	cat >invalid-tag <<-EOF &&
+	object $badoid
+	type commit
+	tag invalid
+	tagger T A Gger <tagger@example.com> 1234567890 -0000
+
+	This is an invalid tag.
+	EOF
+
+	tag=$(git hash-object -t tag -w --stdin <invalid-tag) &&
+	test_when_finished "remove_object $tag" &&
+	echo $tag >.git/refs/tags/invalid &&
+	test_when_finished "git update-ref -d refs/tags/invalid" &&
+	test_must_fail git fsck --tags >out &&
+	cat out &&
+	test_i18ngrep "broken link" out
+'
+
+test_expect_success 'tag pointing to something else than its type' '
+	sha=$(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 $tag: missingTaggerEntry: invalid format - expected '\''tagger'\'' line
+	EOF
+	test_i18ncmp expect out
+'
+
+test_expect_success 'tag with bad tagger' '
+	sha=$(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 $tag >.git/refs/tags/wrong &&
+	test_when_finished "git update-ref -d refs/tags/wrong" &&
+	test_must_fail git fsck --tags 2>out &&
+	test_i18ngrep "error in tag .*: invalid author/committer" out
+'
+
+test_expect_success 'tag with NUL in header' '
+	sha=$(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 &&
+	test_i18ngrep "error in tag $tag.*unterminated header: NUL at offset" out
+'
+
+test_expect_success 'cleaned up' '
+	git fsck >actual 2>&1 &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'rev-list --verify-objects' '
+	git rev-list --verify-objects --all >/dev/null 2>out &&
+	test_must_be_empty out
+'
+
+test_expect_success 'rev-list --verify-objects with bad sha1' '
+	sha=$(echo blob | git hash-object -w --stdin) &&
+	old=$(test_oid_to_path $sha) &&
+	new=$(dirname $old)/$(test_oid ff_2) &&
+	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 &&
+	test_i18ngrep -q "error: hash mismatch $(dirname $new)$(test_oid ff_2)" 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'
+_bzoid=$(printf $ZERO_OID | sed -e 's/00/\\0/g')
+
+test_expect_success 'fsck notices blob entry pointing to null sha1' '
+	(git init null-blob &&
+	 cd null-blob &&
+	 sha=$(printf "100644 file$_bz$_bzoid" |
+	       git hash-object -w --stdin -t tree) &&
+	  git fsck 2>out &&
+	  cat out &&
+	  test_i18ngrep "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$_bzoid" |
+	       git hash-object -w --stdin -t tree) &&
+	  git fsck 2>out &&
+	  cat out &&
+	  test_i18ngrep "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 &&
+			test_i18ngrep "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 &&
+		test_i18ngrep nulInCommit warn.1 &&
+		git fsck 2>warn.2 &&
+		test_i18ngrep 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/$(test_oid_to_path $EMPTY_BLOB) &&
+		blob=$(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:) &&
+		test_i18ngrep -E "$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" &&
+	name=$(test_oid numeric) &&
+	path=$(test_oid_to_path "$name") &&
+	git init --bare alt.git &&
+	echo "../../alt.git/objects" >.git/objects/info/alternates &&
+	mkdir alt.git/objects/$(dirname $path) &&
+	>alt.git/objects/$(dirname $path)/$(basename $path) &&
+	test_must_fail git fsck >out 2>&1 &&
+	test_i18ngrep alt.git out
+'
+
+test_expect_success 'fsck errors in packed objects' '
+	git cat-file commit HEAD >basis &&
+	sed "s/</one/" basis >one &&
+	sed "s/</foo/" basis >two &&
+	one=$(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 &&
+	test_i18ngrep "error in commit $one.* - bad name" out &&
+	test_i18ngrep "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 (large blob)' '
+	blob=$(echo trailing | git hash-object -w --stdin) &&
+	file=$(sha1_file $blob) &&
+	test_when_finished "remove_object $blob" &&
+	chmod +w "$file" &&
+	echo garbage >>"$file" &&
+	test_must_fail git -c core.bigfilethreshold=5 fsck 2>out &&
+	test_i18ngrep "garbage.*$blob" out
+'
+
+test_expect_success 'fsck detects truncated loose object' '
+	# make it big enough that we know we will truncate in the data
+	# portion, not the header
+	test-tool genrandom truncate 4096 >file &&
+	blob=$(git hash-object -w file) &&
+	file=$(sha1_file $blob) &&
+	test_when_finished "remove_object $blob" &&
+	test_copy_bytes 1024 <"$file" >tmp &&
+	rm "$file" &&
+	mv -f tmp "$file" &&
+
+	# check both regular and streaming code paths
+	test_must_fail git fsck 2>out &&
+	test_i18ngrep corrupt.*$blob out &&
+
+	test_must_fail git -c core.bigfilethreshold=128 fsck 2>out &&
+	test_i18ngrep corrupt.*$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 'create dangling-object repository' '
+	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
+	)
+'
+
+test_expect_success 'fsck notices dangling objects' '
+	(
+		cd dangling &&
+		git fsck >actual &&
+		# the output order is non-deterministic, as it comes from a hash
+		sort <actual >actual.sorted &&
+		test_i18ncmp expect actual.sorted
+	)
+'
+
+test_expect_success 'fsck --connectivity-only notices dangling objects' '
+	(
+		cd dangling &&
+		git fsck --connectivity-only >actual &&
+		# the output order is non-deterministic, as it comes from a hash
+		sort <actual >actual.sorted &&
+		test_i18ncmp expect actual.sorted
+	)
+'
+
+test_expect_success 'fsck $name notices bogus $name' '
+	test_must_fail git fsck bogus &&
+	test_must_fail git fsck $ZERO_OID
+'
+
+test_expect_success 'bogus head does not fallback to all heads' '
+	# set up a case that will cause a reachability complaint
+	echo to-be-deleted >foo &&
+	git add foo &&
+	blob=$(git rev-parse :foo) &&
+	test_when_finished "git rm --cached foo" &&
+	remove_object $blob &&
+	test_must_fail git fsck $ZERO_OID >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 &&
+	test_i18ngrep "bad index file" errors
+'
+
+test_done