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git/compat: exit with empty status

If we fell off the end of the script, we'd exit
with whatever status happened to be last. This
is a bug, so now if cmd_foo exits, we exit
the script with a successful status.

--- a/compat

+++ b/compat

@@ -131,21 +131,23 @@

 }

 fn die {

-	>[1=2] echo $*

-	exit boom

+	>[1=2] echo git $_cmdname: $*

+	exit $_cmdname: $*

 }

+_cmdname=$1

 if(~ $0 *compat){

 	ramfs -m /n/gitcompat

-	cp $0 /n/gitcompat/git

+	touch /n/gitcompat/git

+	bind $0 /n/gitcompat/git

 	path=( /n/gitcompat $path )

 	exec rc

 }

-if(! test -f '/env/fn#cmd_'$1){

+if(! test -f '/env/fn#cmd_'$1)

 	die git $1: commmand not implemented

-}

-

 if(! ~ $1 init && ! ~ $1 clone)

 	gitroot=`{git/conf -r} || die repo

+

 cmd_$1 $*(2-)

+exit ''