push: make push.default = current use resolved HEAD

With this change, the output of the push (with push.default set to
current) changes subtly from:

$ git push
...
* [new branch]      HEAD -> push-current-head

to:

$ git push
...
* [new branch]      push-current-head -> push-current-head

This patch was written with a different motivation. There is a problem
unique to push.default = current:

# on branch push-current-head
$ git push
# on another terminal
$ git checkout master
# return to the first terminal
# the push tried to push master!

This happens because the 'git checkout' on the second terminal races
with the 'git push' on the first terminal.  Although this patch does not
solve the core problem (there is still no guarantee that 'git push' on
the first terminal will resolve HEAD before 'git checkout' changes HEAD
on the second), it works in practice.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/push.c b/builtin/push.c
index ba2bd56ebc6a35b04b7c1f30b9446572dff0f5cf..2d84d10720fad88becdfe957f3770a2c44ac0a8f 100644 (file)
--- a/builtin/push.c
+++ b/builtin/push.c
@@ -199,7 +199,7 @@ static void setup_default_push_refspecs(struct remote *remote)
                branch = branch_get(NULL);
                if (!branch)
                        die(_(message_detached_head_die), remote->name);
-               add_refspec("HEAD");
+               add_refspec(branch->name);
                break;
 
        case PUSH_DEFAULT_NOTHING: