dgit: Do not nedlessly re-fetch the rewrite map.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

1 files changed, 4 insertions, 2 deletions

diff --git a/dgit b/dgit
index 824e9d1..d3673c2 100755
--- a/dgit
+++ b/dgit
@@ -2843,8 +2843,10 @@ END
     };
 
     if (parse_cfg_bool 'rewrite-map-enable', 'true', $rewrite_enable) {
-	my $lrf = $do_fetch->("rewrite map", $rewritemap) or return;
-	$mapref = $lrf.'/'.$rewritemap;
+	if (!defined $mapref) {
+	    my $lrf = $do_fetch->("rewrite map", $rewritemap) or return;
+	    $mapref = $lrf.'/'.$rewritemap;
+	}
 	my $rewritemapdata = git_cat_file $mapref.':map';
 	if (defined $rewritemapdata
 	    && $rewritemapdata =~ m/^$dsc_hash(?:[ \t](\w+))/m) {