Git.pm: Fix Git->repository("/somewhere/totally/elsewhere")

Signed-off-by: Petr Baudis <pasky@suse.cz>
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/perl/Git.pm b/perl/Git.pm
index 5ec7ef8..0581447 100644
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -178,7 +178,8 @@
 		};
 
 		if ($dir) {
-			$opts{Repository} = abs_path($dir);
+			$dir =~ m#^/# or $dir = $opts{Directory} . '/' . $dir;
+			$opts{Repository} = $dir;
 
 			# If --git-dir went ok, this shouldn't die either.
 			my $prefix = $search->command_oneline('rev-parse', '--show-prefix');