push: support pushing HEAD to real branch name

This teaches "push <remote> HEAD" to resolve HEAD on the local
side to its real branch name, e.g. master, and then act as if
the real branch name was specified. So we have a shorthand for
pushing the current branch. Besides HEAD, no other symbolic ref
is resolved.

Thanks to Daniel Barkalow <barkalow@iabervon.org> for suggesting
this implementation, which is much simpler than the
implementation proposed before.

Signed-off-by: Steffen Prohaska <prohaska@zib.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-push.c b/builtin-push.c
index 6d1da07c46704f3de837044652f0a1fd149327ad..54fba0e8326cb23508d68dadfe0d31bbff41833c 100644 (file)
--- a/builtin-push.c
+++ b/builtin-push.c
@@ -44,6 +44,15 @@ static void set_refspecs(const char **refs, int nr)
                        strcat(tag, refs[i]);
                        ref = tag;
                }
+               if (!strcmp("HEAD", ref)) {
+                       unsigned char sha1_dummy[20];
+                       ref = resolve_ref(ref, sha1_dummy, 1, NULL);
+                       if (!ref)
+                               die("HEAD cannot be resolved.");
+                       if (prefixcmp(ref, "refs/heads/"))
+                               die("HEAD cannot be resolved to branch.");
+                       ref = xstrdup(ref + 11);
+               }
                add_refspec(ref);
        }
 }

diff --git a/t/t5516-fetch-push.sh b/t/t5516-fetch-push.sh
index 86f9b5346a0d7d8807d8c37c063690540873813a..b0ff48816e91991b26d0158fe65ebd2e70450171 100755 (executable)
--- a/t/t5516-fetch-push.sh
+++ b/t/t5516-fetch-push.sh
@@ -244,6 +244,23 @@ test_expect_success 'push with colon-less refspec (4)' '
 
 '
 
+test_expect_success 'push with HEAD' '
+
+       mk_test heads/master &&
+       git checkout master &&
+       git push testrepo HEAD &&
+       check_push_result $the_commit heads/master
+
+'
+
+test_expect_success 'push with HEAD nonexisting at remote' '
+
+       mk_test heads/master &&
+       git checkout -b local master &&
+       git push testrepo HEAD &&
+       check_push_result $the_commit heads/local
+'
+
 test_expect_success 'push with dry-run' '
 
        mk_test heads/master &&