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);
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' '