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git/t/t6120-describe.sh
Elijah Newren b2182a8730 name-rev: fix names by dropping taggerdate workaround 
Commit 7550424804 ("name-rev: include taggerdate in considering the best
name", 2016-04-22) introduced the idea of using taggerdate in the
criteria for selecting the best name.  At the time, a certain commit in
linux.git -- namely, aed06b9cfcab -- was being named by name-rev as
    v4.6-rc1~9^2~792
which, while correct, was very suboptimal.  Some investigation found
that tweaking the MERGE_TRAVERSAL_WEIGHT to lower it could give
alternate answers such as
    v3.13-rc7~9^2~14^2~42
or
    v3.13~5^2~4^2~2^2~1^2~42
A manual solution involving looking at tagger dates came up with
    v3.13-rc1~65^2^2~42
which is much nicer.  That workaround was then implemented in name-rev.

Unfortunately, the taggerdate heuristic is causing bugs.  I was pointed
to a case in a private repository where name-rev reports a name of the
form
    v2022.10.02~86
when users expected to see one of the form
    v2022.10.01~2
(I've modified the names and numbers a bit from the real testcase.)  As
you can probably guess, v2022.10.01 was created after v2022.10.02 (by a
few hours), even though it pointed to an older commit.  While the
condition is unusual even in the repository in question, it is not the
only problematic set of tags in that repository.  The taggerdate logic
is causing problems.

Further, it turns out that this taggerdate heuristic isn't even helping
anymore.  Due to the fix to naming logic in 3656f84278 ("name-rev:
prefer shorter names over following merges", 2021-12-04), we get
improved names without the taggerdate heuristic.  For the original
commit of interest in linux.git, a modern git without the taggerdate
heuristic still provides the same optimal answer of interest, namely:
    v3.13-rc1~65^2^2~42

So, the taggerdate is no longer providing benefit, and it is causing
problems.  Simply get rid of it.

However, note that "taggerdate" as a variable is used to store things
besides a taggerdate these days.  Ever since commit ef1e74065c
("name-rev: favor describing with tags and use committer date to
tiebreak", 2017-03-29), this has been used to store committer dates and
there it is used as a fallback tiebreaker (as opposed to a primary
criteria overriding effective distance calculations).  We do not want to
remove that fallback tiebreaker, so not all instances of "taggerdate"
are removed in this change.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-02-09 09:01:36 -08:00

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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.
GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
. ./test-lib.sh
check_describe () {
indir= &&
while test $# != 0
do
case "$1" in
-C)
indir="$2"
shift
;;
*)
break
;;
esac
shift
done &&
indir=${indir:+"$indir"/} &&
expect="$1"
shift
describe_opts="$@"
test_expect_success "describe $describe_opts" '
git ${indir:+ -C "$indir"} describe $describe_opts >raw &&
sed -e "s/-g[0-9a-f]*\$/-gHASH/" <raw >actual &&
echo "$expect" >expect &&
test_cmp expect actual
'
}
test_expect_success setup '
test_commit initial file one &&
test_commit second file two &&
test_commit third file three &&
test_commit --annotate A file A &&
test_commit c file c &&
git reset --hard second &&
test_commit --annotate B side B &&
test_tick &&
git merge -m Merged c &&
merged=$(git rev-parse HEAD) &&
git reset --hard second &&
test_commit --no-tag D another D &&
test_tick &&
git tag -a -m R R &&
test_commit e another DD &&
test_commit --no-tag "yet another" another DDD &&
test_tick &&
git merge -m Merged $merged &&
test_commit --no-tag x file
'
check_describe A-8-gHASH HEAD
check_describe A-7-gHASH HEAD^
check_describe R-2-gHASH HEAD^^
check_describe A-3-gHASH HEAD^^2
check_describe B HEAD^^2^
check_describe R-1-gHASH HEAD^^^
check_describe c-7-gHASH --tags HEAD
check_describe c-6-gHASH --tags HEAD^
check_describe e-1-gHASH --tags HEAD^^
check_describe c-2-gHASH --tags HEAD^^2
check_describe B --tags HEAD^^2^
check_describe e --tags HEAD^^^
check_describe heads/main --all HEAD
check_describe tags/c-6-gHASH --all HEAD^
check_describe tags/e --all HEAD^^^
check_describe B-0-gHASH --long HEAD^^2^
check_describe A-3-gHASH --long HEAD^^2
check_describe c-7-gHASH --tags
check_describe e-3-gHASH --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 'renaming tag A to Q locally produces a warning' "
git update-ref refs/tags/Q $(git rev-parse refs/tags/A) &&
git update-ref -d refs/tags/A &&
git describe HEAD 2>err >out &&
cat >expected <<-\EOF &&
warning: tag 'Q' is externally known as 'A'
EOF
test_cmp expected err &&
grep -E '^A-8-g[0-9a-f]+$' out
"
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' '
git update-ref refs/tags/A $(git rev-parse refs/tags/Q) &&
git update-ref -d refs/tags/Q
'
test_expect_success 'pack tag refs' 'git pack-refs'
check_describe A-8-gHASH HEAD
test_expect_success 'describe works from outside repo using --git-dir' '
git clone --bare "$TRASH_DIRECTORY" "$TRASH_DIRECTORY/bare" &&
git --git-dir "$TRASH_DIRECTORY/bare" describe >out &&
grep -E "^A-8-g[0-9a-f]+$" out
'
check_describe "A-8-gHASH" --dirty
test_expect_success 'describe --dirty with --work-tree' '
(
cd "$TEST_DIRECTORY" &&
git --git-dir "$TRASH_DIRECTORY/.git" --work-tree "$TRASH_DIRECTORY" describe --dirty >"$TRASH_DIRECTORY/out"
) &&
grep -E "^A-8-g[0-9a-f]+$" out
'
test_expect_success 'set-up dirty work tree' '
echo >>file
'
test_expect_success 'describe --dirty with --work-tree (dirty)' '
git describe --dirty >expected &&
(
cd "$TEST_DIRECTORY" &&
git --git-dir "$TRASH_DIRECTORY/.git" --work-tree "$TRASH_DIRECTORY" describe --dirty >"$TRASH_DIRECTORY/out"
) &&
grep -E "^A-8-g[0-9a-f]+-dirty$" out &&
test_cmp expected out
'
test_expect_success 'describe --dirty=.mod with --work-tree (dirty)' '
git describe --dirty=.mod >expected &&
(
cd "$TEST_DIRECTORY" &&
git --git-dir "$TRASH_DIRECTORY/.git" --work-tree "$TRASH_DIRECTORY" describe --dirty=.mod >"$TRASH_DIRECTORY/out"
) &&
grep -E "^A-8-g[0-9a-f]+.mod$" out &&
test_cmp expected 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-3-gHASH" --match="test-*"
check_describe "test1-lightweight-2-gHASH" --tags --match="test1-*"
check_describe "test2-lightweight-1-gHASH" --tags --match="test2-*"
check_describe "test2-lightweight-0-gHASH" --long --tags --match="test2-*" HEAD^
check_describe "test2-lightweight-0-gHASH" --long --tags --match="test1-*" --match="test2-*" HEAD^
check_describe "test2-lightweight-0-gHASH" --long --tags --match="test1-*" --no-match --match="test2-*" HEAD^
check_describe "test1-lightweight-2-gHASH" --long --tags --match="test1-*" --match="test3-*" HEAD
check_describe "test1-lightweight-2-gHASH" --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-11-gHASH" --all --match="branch_*" --exclude="branch_C" HEAD
check_describe "remotes/origin/remote_branch_A-11-gHASH" --all --match="origin/remote_branch_*" --exclude="origin/remote_branch_C" HEAD
check_describe "original/original_branch_A-6-gHASH" --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 || return 1
done &&
sort <expect.unsorted >expect &&
git name-rev --all >actual.unsorted &&
sort <actual.unsorted >actual &&
test_cmp expect actual
'
test_expect_success 'name-rev --annotate-stdin' '
>expect.unsorted &&
for rev in $(git rev-list --all)
do
name=$(git name-rev --name-only $rev) &&
echo "$rev ($name)" >>expect.unsorted || return 1
done &&
sort <expect.unsorted >expect &&
git rev-list --all | git name-rev --annotate-stdin >actual.unsorted &&
sort <actual.unsorted >actual &&
test_cmp expect actual
'
test_expect_success 'name-rev --stdin deprecated' "
git rev-list --all | git name-rev --stdin 2>actual &&
grep -E 'warning: --stdin is deprecated' actual
"
test_expect_success 'describe --contains with the exact tags' '
echo "A^0" >expect &&
tag_object=$(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/main
committer A U Thor <author@example.com> $((1000000000 + $i * 100)) +0200
data <<EOF
commit #$i
EOF" &&
if test $i = 1
then
echo "from refs/heads/main^0"
fi &&
i=$(($i + 1)) || return 1
done | git fast-import &&
git checkout main &&
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 $ZERO_OID
'
test_expect_success 'name-rev a rev shortly after epoch' '
test_when_finished "git checkout main" &&
git checkout --orphan no-timestamp-underflow &&
# Any date closer to epoch than the CUTOFF_DATE_SLOP constant
# in builtin/name-rev.c.
GIT_COMMITTER_DATE="@1234 +0000" \
git commit -m "committer date shortly after epoch" &&
old_commit_oid=$(git rev-parse HEAD) &&
echo "$old_commit_oid no-timestamp-underflow" >expect &&
git name-rev $old_commit_oid >actual &&
test_cmp expect actual
'
# A--------------main
# \ /
# \----------M2
# \ /
# \---M1-C
# \ /
# B
test_expect_success 'name-rev covers all conditions while looking at parents' '
git init repo &&
(
cd repo &&
echo A >file &&
git add file &&
git commit -m A &&
A=$(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 $A &&
git merge --no-ff HEAD@{1} && # M2
git checkout main &&
git merge --no-ff HEAD@{1} &&
echo "$B main^2^2~1^2" >expect &&
git name-rev $B >actual &&
test_cmp expect actual
)
'
# A-B-C-D-E-main
#
# Where C has a non-monotonically increasing commit timestamp w.r.t. other
# commits
test_expect_success 'non-monotonic commit dates setup' '
UNIX_EPOCH_ZERO="@0 +0000" &&
git init non-monotonic &&
test_commit -C non-monotonic A &&
test_commit -C non-monotonic --no-tag B &&
test_commit -C non-monotonic --no-tag --date "$UNIX_EPOCH_ZERO" C &&
test_commit -C non-monotonic D &&
test_commit -C non-monotonic E
'
test_expect_success 'name-rev with commitGraph handles non-monotonic timestamps' '
test_config -C non-monotonic core.commitGraph true &&
(
cd non-monotonic &&
git commit-graph write --reachable &&
echo "main~3 tags/D~2" >expect &&
git name-rev --tags main~3 >actual &&
test_cmp expect actual
)
'
test_expect_success 'name-rev --all works with non-monotonic timestamps' '
test_config -C non-monotonic core.commitGraph false &&
(
cd non-monotonic &&
rm -rf .git/info/commit-graph* &&
cat >tags <<-\EOF &&
tags/E
tags/D
tags/D~1
tags/D~2
tags/A
EOF
git log --pretty=%H >revs &&
paste -d" " revs tags | sort >expect &&
git name-rev --tags --all | sort >actual &&
test_cmp expect actual
)
'
test_expect_success 'name-rev --annotate-stdin works with non-monotonic timestamps' '
test_config -C non-monotonic core.commitGraph false &&
(
cd non-monotonic &&
rm -rf .git/info/commit-graph* &&
cat >expect <<-\EOF &&
E
D
D~1
D~2
A
EOF
git log --pretty=%H >revs &&
git name-rev --tags --annotate-stdin --name-only <revs >actual &&
test_cmp expect actual
)
'
test_expect_success 'name-rev --all works with commitGraph' '
test_config -C non-monotonic core.commitGraph true &&
(
cd non-monotonic &&
git commit-graph write --reachable &&
cat >tags <<-\EOF &&
tags/E
tags/D
tags/D~1
tags/D~2
tags/A
EOF
git log --pretty=%H >revs &&
paste -d" " revs tags | sort >expect &&
git name-rev --tags --all | sort >actual &&
test_cmp expect actual
)
'
test_expect_success 'name-rev --annotate-stdin works with commitGraph' '
test_config -C non-monotonic core.commitGraph true &&
(
cd non-monotonic &&
git commit-graph write --reachable &&
cat >expect <<-\EOF &&
E
D
D~1
D~2
A
EOF
git log --pretty=%H >revs &&
git name-rev --tags --annotate-stdin --name-only <revs >actual &&
test_cmp expect actual
)
'
# B
# o
# \
# o-----o---o----x
# A
#
test_expect_success 'setup: 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 main -m x
)
'
check_describe -C disjoint1 "A-3-gHASH" HEAD
# B
# o---o---o------------.
# \
# o---o---x
# A
#
test_expect_success 'setup: 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 main -m x
)
'
check_describe -C disjoint2 "B-3-gHASH" HEAD
test_expect_success 'setup misleading taggerdates' '
GIT_COMMITTER_DATE="2006-12-12 12:31" git tag -a -m "another tag" newer-tag-older-commit unique-file~1
'
check_describe newer-tag-older-commit~1 --contains unique-file~2
test_done
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