[PATCH] tag: allow idempotent "git tag" without "--force"
- From
Junio C Hamano <gitster@pobox.com>
- Date
- Jul 11, 2025, 19:10 UTC
- Message-ID
- <xmqqv7nyzgp7.fsf@gitster.g>
- In-Reply-To
- <xmqqzfefodje.fsf@gitster.g>
When "git tag T O" is told to create a tag pointing at an object O without the "--force" option, it refuses with "tag T already exists", even when T points at O (which makes it a no-op).
Let's allow this "idempotent" case by special casing and making it truly a no-op.
Signed-off-by: Junio C Hamano <gitster@pobox.com> ---
* In thread https://lore.kernel.org/git/xmqqzfefodje.fsf@gitster.g/ I had a slightly different version but I think the logic flow reads better in this version, even though they essentially do the same thing.
builtin/tag.c | 2 ++ t/t7004-tag.sh | 12 +++++++++--- 2 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/builtin/tag.c b/builtin/tag.c index c4bd145831..1dd69b3447 100644 --- a/builtin/tag.c +++ b/builtin/tag.c @@ -647,6 +647,8 @@ int cmd_tag(int argc, if (refs_read_ref(get_main_ref_store(the_repository), ref.buf, &prev)) oidclr(&prev, the_repository->hash_algo); + else if (!create_tag_object && oideq(&object, &prev)) + exit(0); else if (!force) die(_("tag '%s' already exists"), tag); diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh index 10835631ca..9a253a44a8 100755 --- a/t/t7004-tag.sh +++ b/t/t7004-tag.sh @@ -126,7 +126,7 @@ test_expect_success 'annotated tag with --create-reflog has correct message' ' ' test_expect_success '--create-reflog does not create reflog on failure' ' - test_must_fail git tag --create-reflog mytag && + test_must_fail git tag --create-reflog mytag no-such-object && test_must_fail git reflog exists refs/tags/mytag ' @@ -183,8 +183,14 @@ test_expect_success 'listing tags using a non-matching pattern should output not # special cases for creating tags: -test_expect_success 'trying to create a tag with the name of one existing should fail' ' - test_must_fail git tag mytag +test_expect_success 'recreating a tag without --force' ' + # light-weight tag pointing at the same thing + # now succeeds + git tag mytag HEAD && + # light-weight tag pointing at a different thing + test_must_fail git tag mytag HEAD: && + # creating annotated tag, pointing at the same object. + test_must_fail git tag -a -m anno mytag $taggedobject ' test_expect_success 'trying to create a tag with a non-valid name should fail' '
-- 2.50.1-396-g5c2aadec13