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#!/bin/sh

test_description='test describe'

#  o---o-----o----o----o-------o----x
#       \   D,R   e           /
#        \---o-------------o-'
#         \  B            /
#          `-o----o----o-'
#                 A    c
#
# First parent of a merge commit is on the same line, second parent below.

. ./test-lib.sh

check_describe () {
	expect="$1"
	shift
	describe_opts="$@"
	test_expect_success "describe $describe_opts" '
	R=$(git describe $describe_opts 2>err.actual) &&
	case "$R" in
	$expect)	echo happy ;;
	*)	echo "Oops - $R is not $expect" &&
		false ;;
	esac
	'
}

test_expect_success setup '

	test_tick &&
	echo one >file && git add file && git commit -m initial &&
	one=$(git rev-parse HEAD) &&

	git describe --always HEAD &&

	test_tick &&
	echo two >file && git add file && git commit -m second &&
	two=$(git rev-parse HEAD) &&

	test_tick &&
	echo three >file && git add file && git commit -m third &&

	test_tick &&
	echo A >file && git add file && git commit -m A &&
	test_tick &&
	git tag -a -m A A &&

	test_tick &&
	echo c >file && git add file && git commit -m c &&
	test_tick &&
	git tag c &&

	git reset --hard $two &&
	test_tick &&
	echo B >side && git add side && git commit -m B &&
	test_tick &&
	git tag -a -m B B &&

	test_tick &&
	git merge -m Merged c &&
	merged=$(git rev-parse HEAD) &&

	git reset --hard $two &&
	test_tick &&
	echo D >another && git add another && git commit -m D &&
	test_tick &&
	git tag -a -m D D &&
	test_tick &&
	git tag -a -m R R &&

	test_tick &&
	echo DD >another && git commit -a -m another &&

	test_tick &&
	git tag e &&

	test_tick &&
	echo DDD >another && git commit -a -m "yet another" &&

	test_tick &&
	git merge -m Merged $merged &&

	test_tick &&
	echo X >file && echo X >side && git add file side &&
	git commit -m x

'

check_describe A-* HEAD
check_describe A-* HEAD^
check_describe R-* HEAD^^
check_describe A-* HEAD^^2
check_describe B HEAD^^2^
check_describe R-* HEAD^^^

check_describe c-* --tags HEAD
check_describe c-* --tags HEAD^
check_describe e-* --tags HEAD^^
check_describe c-* --tags HEAD^^2
check_describe B --tags HEAD^^2^
check_describe e --tags HEAD^^^

check_describe heads/master --all HEAD
check_describe tags/c-* --all HEAD^
check_describe tags/e --all HEAD^^^

check_describe B-0-* --long HEAD^^2^
check_describe A-3-* --long HEAD^^2

check_describe c-7-* --tags
check_describe e-3-* --first-parent --tags

test_expect_success 'describe --contains defaults to HEAD without commit-ish' '
	echo "A^0" >expect &&
	git checkout A &&
	test_when_finished "git checkout -" &&
	git describe --contains >actual &&
	test_cmp expect actual
'

check_describe tags/A --all A^0
test_expect_success 'no warning was displayed for A' '
	test_must_be_empty err.actual
'

test_expect_success 'rename tag A to Q locally' '
	mv .git/refs/tags/A .git/refs/tags/Q
'
cat - >err.expect <<EOF
warning: tag 'Q' is externally known as 'A'
EOF
check_describe A-* HEAD
test_expect_success 'warning was displayed for Q' '
	test_i18ncmp err.expect err.actual
'
test_expect_success 'misnamed annotated tag forces long output' '
	description=$(git describe --no-long Q^0) &&
	expr "$description" : "A-0-g[0-9a-f]*$" &&
	git rev-parse --verify "$description" >actual &&
	git rev-parse --verify Q^0 >expect &&
	test_cmp expect actual
'

test_expect_success 'abbrev=0 will not break misplaced tag (1)' '
	description=$(git describe --abbrev=0 Q^0) &&
	expr "$description" : "A-0-g[0-9a-f]*$"
'

test_expect_success 'abbrev=0 will not break misplaced tag (2)' '
	description=$(git describe --abbrev=0 c^0) &&
	expr "$description" : "A-1-g[0-9a-f]*$"
'

test_expect_success 'rename tag Q back to A' '
	mv .git/refs/tags/Q .git/refs/tags/A
'

test_expect_success 'pack tag refs' 'git pack-refs'
check_describe A-* HEAD

test_expect_success 'describe works from outside repo using --git-dir' '
	git clone --bare "$TRASH_DIRECTORY" "$TRASH_DIRECTORY/bare" &&
	git --git-dir "$TRASH_DIRECTORY/bare" describe >out &&
	grep -E "^A-[1-9][0-9]?-g[0-9a-f]+$" out
'

check_describe "A-*[0-9a-f]" --dirty

test_expect_success 'describe --dirty with --work-tree' '
	(
		cd "$TEST_DIRECTORY" &&
		git --git-dir "$TRASH_DIRECTORY/.git" --work-tree "$TRASH_DIRECTORY" describe --dirty >"$TRASH_DIRECTORY/out"
	) &&
	grep -E "^A-[1-9][0-9]?-g[0-9a-f]+$" out
'

test_expect_success 'set-up dirty work tree' '
	echo >>file
'

check_describe "A-*[0-9a-f]-dirty" --dirty

test_expect_success 'describe --dirty with --work-tree (dirty)' '
	(
		cd "$TEST_DIRECTORY" &&
		git --git-dir "$TRASH_DIRECTORY/.git" --work-tree "$TRASH_DIRECTORY" describe --dirty >"$TRASH_DIRECTORY/out"
	) &&
	grep -E "^A-[1-9][0-9]?-g[0-9a-f]+-dirty$" out
'

check_describe "A-*[0-9a-f].mod" --dirty=.mod

test_expect_success 'describe --dirty=.mod with --work-tree (dirty)' '
	(
		cd "$TEST_DIRECTORY" &&
		git --git-dir "$TRASH_DIRECTORY/.git" --work-tree "$TRASH_DIRECTORY" describe --dirty=.mod >"$TRASH_DIRECTORY/out"
	) &&
	grep -E "^A-[1-9][0-9]?-g[0-9a-f]+.mod$" out
'

test_expect_success 'describe --dirty HEAD' '
	test_must_fail git describe --dirty HEAD
'

test_expect_success 'set-up matching pattern tests' '
	git tag -a -m test-annotated test-annotated &&
	echo >>file &&
	test_tick &&
	git commit -a -m "one more" &&
	git tag test1-lightweight &&
	echo >>file &&
	test_tick &&
	git commit -a -m "yet another" &&
	git tag test2-lightweight &&
	echo >>file &&
	test_tick &&
	git commit -a -m "even more"

'

check_describe "test-annotated-*" --match="test-*"

check_describe "test1-lightweight-*" --tags --match="test1-*"

check_describe "test2-lightweight-*" --tags --match="test2-*"

check_describe "test2-lightweight-*" --long --tags --match="test2-*" HEAD^

check_describe "test2-lightweight-*" --long --tags --match="test1-*" --match="test2-*" HEAD^

check_describe "test2-lightweight-*" --long --tags --match="test1-*" --no-match --match="test2-*" HEAD^

check_describe "test1-lightweight-*" --long --tags --match="test1-*" --match="test3-*" HEAD

check_describe "test1-lightweight-*" --long --tags --match="test3-*" --match="test1-*" HEAD

test_expect_success 'set-up branches' '
	git branch branch_A A &&
	git branch branch_C c &&
	git update-ref refs/remotes/origin/remote_branch_A "A^{commit}" &&
	git update-ref refs/remotes/origin/remote_branch_C "c^{commit}" &&
	git update-ref refs/original/original_branch_A test-annotated~2
'

check_describe "heads/branch_A*" --all --match="branch_*" --exclude="branch_C" HEAD

check_describe "remotes/origin/remote_branch_A*" --all --match="origin/remote_branch_*" --exclude="origin/remote_branch_C" HEAD

check_describe "original/original_branch_A*" --all test-annotated~1

test_expect_success '--match does not work for other types' '
	test_must_fail git describe --all --match="*original_branch_*" test-annotated~1
'

test_expect_success '--exclude does not work for other types' '
	R=$(git describe --all --exclude="any_pattern_even_not_matching" test-annotated~1) &&
	case "$R" in
	*original_branch_A*) echo "fail: Found unknown reference $R with --exclude"
		false;;
	*) echo ok: Found some known type;;
	esac
'

test_expect_success 'name-rev with exact tags' '
	echo A >expect &&
	tag_object=$(git rev-parse refs/tags/A) &&
	git name-rev --tags --name-only $tag_object >actual &&
	test_cmp expect actual &&

	echo "A^0" >expect &&
	tagged_commit=$(git rev-parse "refs/tags/A^0") &&
	git name-rev --tags --name-only $tagged_commit >actual &&
	test_cmp expect actual
'

test_expect_success 'name-rev --all' '
	>expect.unsorted &&
	for rev in $(git rev-list --all)
	do
		git name-rev $rev >>expect.unsorted
	done &&
	sort <expect.unsorted >expect &&
	git name-rev --all >actual.unsorted &&
	sort <actual.unsorted >actual &&
	test_cmp expect actual
'

test_expect_success 'name-rev --stdin' '
	>expect.unsorted &&
	for rev in $(git rev-list --all)
	do
		name=$(git name-rev --name-only $rev) &&
		echo "$rev ($name)" >>expect.unsorted
	done &&
	sort <expect.unsorted >expect &&
	git rev-list --all | git name-rev --stdin >actual.unsorted &&
	sort <actual.unsorted >actual &&
	test_cmp expect actual
'

test_expect_success 'describe --contains with the exact tags' '
	echo "A^0" >expect &&
	tag_object=$(git rev-parse refs/tags/A) &&
	git describe --contains $tag_object >actual &&
	test_cmp expect actual &&

	echo "A^0" >expect &&
	tagged_commit=$(git rev-parse "refs/tags/A^0") &&
	git describe --contains $tagged_commit >actual &&
	test_cmp expect actual
'

test_expect_success 'describe --contains and --match' '
	echo "A^0" >expect &&
	tagged_commit=$(git rev-parse "refs/tags/A^0") &&
	test_must_fail git describe --contains --match="B" $tagged_commit &&
	git describe --contains --match="B" --match="A" $tagged_commit >actual &&
	test_cmp expect actual
'

test_expect_success 'describe --exclude' '
	echo "c~1" >expect &&
	tagged_commit=$(git rev-parse "refs/tags/A^0") &&
	test_must_fail git describe --contains --match="B" $tagged_commit &&
	git describe --contains --match="?" --exclude="A" $tagged_commit >actual &&
	test_cmp expect actual
'

test_expect_success 'describe --contains and --no-match' '
	echo "A^0" >expect &&
	tagged_commit=$(git rev-parse "refs/tags/A^0") &&
	git describe --contains --match="B" --no-match $tagged_commit >actual &&
	test_cmp expect actual
'

test_expect_success 'setup and absorb a submodule' '
	test_create_repo sub1 &&
	test_commit -C sub1 initial &&
	git submodule add ./sub1 &&
	git submodule absorbgitdirs &&
	git commit -a -m "add submodule" &&
	git describe --dirty >expect &&
	git describe --broken >out &&
	test_cmp expect out
'

test_expect_success 'describe chokes on severely broken submodules' '
	mv .git/modules/sub1/ .git/modules/sub_moved &&
	test_must_fail git describe --dirty
'

test_expect_success 'describe ignoring a broken submodule' '
	git describe --broken >out &&
	grep broken out
'

test_expect_success 'describe with --work-tree ignoring a broken submodule' '
	(
		cd "$TEST_DIRECTORY" &&
		git --git-dir "$TRASH_DIRECTORY/.git" --work-tree "$TRASH_DIRECTORY" describe --broken >"$TRASH_DIRECTORY/out"
	) &&
	test_when_finished "mv .git/modules/sub_moved .git/modules/sub1" &&
	grep broken out
'

test_expect_success 'describe a blob at a directly tagged commit' '
	echo "make it a unique blob" >file &&
	git add file && git commit -m "content in file" &&
	git tag -a -m "latest annotated tag" unique-file &&
	git describe HEAD:file >actual &&
	echo "unique-file:file" >expect &&
	test_cmp expect actual
'

test_expect_success 'describe a blob with its first introduction' '
	git commit --allow-empty -m "empty commit" &&
	git rm file &&
	git commit -m "delete blob" &&
	git revert HEAD &&
	git commit --allow-empty -m "empty commit" &&
	git describe HEAD:file >actual &&
	echo "unique-file:file" >expect &&
	test_cmp expect actual
'

test_expect_success 'describe directly tagged blob' '
	git tag test-blob unique-file:file &&
	git describe test-blob >actual &&
	echo "unique-file:file" >expect &&
	# suboptimal: we rather want to see "test-blob"
	test_cmp expect actual
'

test_expect_success 'describe tag object' '
	git tag test-blob-1 -a -m msg unique-file:file &&
	test_must_fail git describe test-blob-1 2>actual &&
	test_i18ngrep "fatal: test-blob-1 is neither a commit nor blob" actual
'

test_expect_success ULIMIT_STACK_SIZE 'name-rev works in a deep repo' '
	i=1 &&
	while test $i -lt 8000
	do
		echo "commit refs/heads/master
committer A U Thor <author@example.com> $((1000000000 + $i * 100)) +0200
data <<EOF
commit #$i
EOF"
		test $i = 1 && echo "from refs/heads/master^0"
		i=$(($i + 1))
	done | git fast-import &&
	git checkout master &&
	git tag far-far-away HEAD^ &&
	echo "HEAD~4000 tags/far-far-away~3999" >expect &&
	git name-rev HEAD~4000 >actual &&
	test_cmp expect actual &&
	run_with_limited_stack git name-rev HEAD~4000 >actual &&
	test_cmp expect actual
'

test_expect_success ULIMIT_STACK_SIZE 'describe works in a deep repo' '
	git tag -f far-far-away HEAD~7999 &&
	echo "far-far-away" >expect &&
	git describe --tags --abbrev=0 HEAD~4000 >actual &&
	test_cmp expect actual &&
	run_with_limited_stack git describe --tags --abbrev=0 HEAD~4000 >actual &&
	test_cmp expect actual
'

check_describe tags/A --all A
check_describe tags/c --all c
check_describe heads/branch_A --all --match='branch_*' branch_A

test_expect_success 'describe complains about tree object' '
	test_must_fail git describe HEAD^{tree}
'

test_expect_success 'describe complains about missing object' '
	test_must_fail git describe $ZERO_OID
'

test_expect_success 'name-rev a rev shortly after epoch' '
	test_when_finished "git checkout master" &&

	git checkout --orphan no-timestamp-underflow &&
	# Any date closer to epoch than the CUTOFF_DATE_SLOP constant
	# in builtin/name-rev.c.
	GIT_COMMITTER_DATE="@1234 +0000" \
	git commit -m "committer date shortly after epoch" &&
	old_commit_oid=$(git rev-parse HEAD) &&

	echo "$old_commit_oid no-timestamp-underflow" >expect &&
	git name-rev $old_commit_oid >actual &&
	test_cmp expect actual
'

# A--------------master
#  \            /
#   \----------M2
#    \        /
#     \---M1-C
#      \ /
#       B
test_expect_success 'name-rev covers all conditions while looking at parents' '
	git init repo &&
	(
		cd repo &&

		echo A >file &&
		git add file &&
		git commit -m A &&
		A=$(git rev-parse HEAD) &&

		git checkout --detach &&
		echo B >file &&
		git commit -m B file &&
		B=$(git rev-parse HEAD) &&

		git checkout $A &&
		git merge --no-ff $B &&  # M1

		echo C >file &&
		git commit -m C file &&

		git checkout $A &&
		git merge --no-ff HEAD@{1} && # M2

		git checkout master &&
		git merge --no-ff HEAD@{1} &&

		echo "$B master^2^2~1^2" >expect &&
		git name-rev $B >actual &&

		test_cmp expect actual
	)
'

#               B
#               o
#                \
#  o-----o---o----x
#        A
#
test_expect_success 'describe commits with disjoint bases' '
	git init disjoint1 &&
	(
		cd disjoint1 &&

		echo o >> file && git add file && git commit -m o &&
		echo A >> file && git add file && git commit -m A &&
		git tag A -a -m A &&
		echo o >> file && git add file && git commit -m o &&

		git checkout --orphan branch && rm file &&
		echo B > file2 && git add file2 && git commit -m B &&
		git tag B -a -m B &&
		git merge --no-ff --allow-unrelated-histories master -m x &&

		check_describe "A-3-*" HEAD
	)
'

#           B
#   o---o---o------------.
#                         \
#                  o---o---x
#                  A
#
test_expect_success 'describe commits with disjoint bases 2' '
	git init disjoint2 &&
	(
		cd disjoint2 &&

		echo A >> file && git add file && GIT_COMMITTER_DATE="2020-01-01 18:00" git commit -m A &&
		git tag A -a -m A &&
		echo o >> file && git add file && GIT_COMMITTER_DATE="2020-01-01 18:01" git commit -m o &&

		git checkout --orphan branch &&
		echo o >> file2 && git add file2 && GIT_COMMITTER_DATE="2020-01-01 15:00" git commit -m o &&
		echo o >> file2 && git add file2 && GIT_COMMITTER_DATE="2020-01-01 15:01" git commit -m o &&
		echo B >> file2 && git add file2 && GIT_COMMITTER_DATE="2020-01-01 15:02" git commit -m B &&
		git tag B -a -m B &&
		git merge --no-ff --allow-unrelated-histories master -m x &&

		check_describe "B-3-*" HEAD
	)
'

test_done
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