git-debrebase: Break out resolve_upstream_version

NFC.

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

1 files changed, 12 insertions, 7 deletions

diff --git a/git-debrebase b/git-debrebase
index a28b910..35284d5 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -1184,18 +1184,23 @@ sub do_stitch ($;$) {
     stitch($dangling_head, $ffq_prev, $gdrlast, $ffq_prev_commitish, $prose);
 }
 
+sub upstream_commitish_search ($$) {
+    my ($upstream_version, $tried) = @_;
+    # todo: at some point maybe use git-deborig to do this
+    foreach my $tagpfx ('', 'v', 'upstream/') {
+	my $tag = $tagpfx.(dep14_version_mangle $upstream_version);
+	my $new_upstream = git_get_ref "refs/tags/$tag";
+	return $new_upstream if length $new_upstream;
+	push @$tried, $tag;
+    }
+}
+
 sub resolve_upstream_version ($$) {
     my ($new_upstream, $upstream_version) = @_;
 
     if (!defined $new_upstream) {
 	my @tried;
-	# todo: at some point maybe use git-deborig to do this
-	foreach my $tagpfx ('', 'v', 'upstream/') {
-	    my $tag = $tagpfx.(dep14_version_mangle $upstream_version);
-	    $new_upstream = git_get_ref "refs/tags/$tag";
-	    last if length $new_upstream;
-	    push @tried, $tag;
-	}
+	$new_upstream = upstream_commitish_search $upstream_version, \@tried;
 	if (!length $new_upstream) {
 	    fail "Could not determine appropriate upstream commitish.\n".
 		" (Tried these tags: @tried)\n".