[PATCH] Make "git pull" and "git fetch" default to origin

Amos Waterland sent in a patch for the pre-multi-head aware
version of "git pull" to do this, but the code changed quite a
bit since then.  If there is no argument given to pull from, and
if "origin" makes sense, default to fetch/pull from "origin"
instead of barfing.

[jc: besides, the patch by Amos broke the non-default case where
explicit refspecs are specified, and did not make sure we know
what "origin" means before defaulting to it.]
Signed-off-by: NJunio C Hamano <junkio@cox.net>

git-fetch-script

@@ -8,7 +8,10 @@ _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
 append=
 case "$#" in
 0)
-	die "Where do you want to fetch from?" ;;
+	test -f "$GIT_DIR/branches/origin" ||
+		test -f "$GIT_DIR/remotes/origin" ||
+			die "Where do you want to fetch from?"
+	set origin ;;
 *)
 	case "$1" in
 	-a|--a|--ap|--app|--appe|--appen|--append)