tag: --force does not have to warn when creating tags

"git tag --force" mentions what old tag object is being replaced
when it is used to update an existing tag, but it shows the same
message when creating a new one.  Stop doing that, as it does not
add any information.

Add a test for this and also to ensure --force can replace tags at
all.

Signed-off-by: Phil Hord <hordp@cisco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/tag.c b/builtin/tag.c
index 9c3e0673d5bd4e011c877c4d3a17975498265e22..d4824800b74849732e198c8b0a9ea4a57497d0b6 100644 (file)
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -584,7 +584,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
                die(_("%s: cannot lock the ref"), ref.buf);
        if (write_ref_sha1(lock, object, NULL) < 0)
                die(_("%s: cannot update the ref"), ref.buf);
-       if (force && hashcmp(prev, object))
+       if (force && !is_null_sha1(prev) && hashcmp(prev, object))
                printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 
        strbuf_release(&buf);

diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
index f5a79b13aecf4020b8a453f5f27568ce4f88bbbc..c8d6e9f88cc36f7e6a1208721ea6c45991452b9e 100755 (executable)
--- a/t/t7004-tag.sh
+++ b/t/t7004-tag.sh
@@ -104,6 +104,18 @@ test_expect_success 'creating a tag using HEAD directly should succeed' '
        tag_exists myhead
 '
 
+test_expect_success '--force can create a tag with the name of one existing' '
+       tag_exists mytag &&
+       git tag --force mytag &&
+       tag_exists mytag'
+
+test_expect_success '--force is moot with a non-existing tag name' '
+       git tag newtag >expect &&
+       git tag --force forcetag >actual &&
+       test_cmp expect actual
+'
+git tag -d newtag forcetag
+
 # deleting tags:
 
 test_expect_success 'trying to delete an unknown tag should fail' '