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 <gitster@pobox.com>

diff --git a/builtin/merge.c b/builtin/merge.c
index 3a451727d0e637ae197c9a1193435e57e84e6c58..b4fbc60e6d25157ed022ebd3f2bc8a2aeb774b0c 100644 (file)
--- 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 5d8c428543bd61a27489af72045b4e1816d240e9..a598dfa4777a8d459fd6e68b9a63c77d87e47c24 100755 (executable)
--- 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