From b5c9f1c1b0ed9c91463b9f46a7c9dff3efc53773 Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Sun, 5 Feb 2012 16:22:12 -0800 Subject: [PATCH] merge: do not create a signed tag merge under --ff-only option Starting at release v1.7.9, if you ask to merge a signed tag, "git merge" always creates a merge commit, even when the tag points at a commit that happens to be a descendant of your current commit. Unfortunately, this interacts rather badly for people who use --ff-only to make sure that their branch is free of local developments. It used to be possible to say: $ git checkout -b frotz v1.7.9~30 $ git merge --ff-only v1.7.9 and expect that the resulting tip of frotz branch matches v1.7.9^0 (aka the commit tagged as v1.7.9), but this fails with the updated Git with: fatal: Not possible to fast-forward, aborting. because a merge that merges v1.7.9 tag to v1.7.9~30 cannot be created by fast forwarding. We could teach users that now they have to do $ git merge --ff-only v1.7.9^0 but it is far more pleasant for users if we DWIMmed this ourselves. When an integrator pulls in a topic from a lieutenant via a signed tag, even when the work done by the lieutenant happens to fast-forward, the integrator wants to have a merge record, so the integrator will not be asking for --ff-only when running "git pull" in such a case. Therefore, this change should not regress the support for the use case v1.7.9 wanted to add. Signed-off-by: Junio C Hamano --- builtin/merge.c | 3 ++- t/t7600-merge.sh | 13 +++++++++++++ 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/builtin/merge.c b/builtin/merge.c index 3a451727d..b4fbc60e6 100644 --- a/builtin/merge.c +++ b/builtin/merge.c @@ -1283,7 +1283,8 @@ int cmd_merge(int argc, const char **argv, const char *prefix) sha1_to_hex(commit->object.sha1)); setenv(buf.buf, argv[i], 1); strbuf_reset(&buf); - if (merge_remote_util(commit) && + if (!fast_forward_only && + merge_remote_util(commit) && merge_remote_util(commit)->obj && merge_remote_util(commit)->obj->type == OBJ_TAG) { option_edit = 1; diff --git a/t/t7600-merge.sh b/t/t7600-merge.sh index 5d8c42854..a598dfa47 100755 --- a/t/t7600-merge.sh +++ b/t/t7600-merge.sh @@ -27,6 +27,7 @@ Testing basic merge operations/option parsing. ' . ./test-lib.sh +. "$TEST_DIRECTORY"/lib-gpg.sh printf '%s\n' 1 2 3 4 5 6 7 8 9 >file printf '%s\n' '1 X' 2 3 4 5 6 7 8 9 >file.1 @@ -670,4 +671,16 @@ test_expect_success 'merge --no-ff --edit' ' test_cmp actual expected ' +test_expect_success GPG 'merge --ff-only tag' ' + git reset --hard c0 && + git commit --allow-empty -m "A newer commit" && + git tag -s -m "A newer commit" signed && + git reset --hard c0 && + + git merge --ff-only signed && + git rev-parse signed^0 >expect && + git rev-parse HEAD >actual && + test_cmp actual expect +' + test_done -- 2.30.2