dgit: unrepres. changes: Separate out creation and deletion

We are going to want to handle these cases separately because the
behaviour of dpkg-source is different.

In this commit, simply clone the existing code (and add a few
comments), so no functional change.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/dgit b/dgit
index 8b9934b..1f15630 100755
--- a/dgit
+++ b/dgit
@@ -4915,9 +4915,16 @@ sub quiltify_trees_differ ($$;$$$) {
 		           $oldmode =~ m/^(?:10|12)\d{4}$/;
 		if ($oldmode =~ m/[^0]/ &&
 		    $newmode =~ m/[^0]/) {
+		    # both old and new files exist
 		    die "mode or type changed\n" if $oldmode ne $newmode;
 		    die "modified symlink\n" unless $newmode =~ m/^10/;
+		} elsif ($oldmode =~ m/[^0]/) {
+		    # deletion
+		    die "non-default mode or type\n"
+			unless $newmode =~ m/^100644$/ ||
+			       $oldmode =~ m/^100644$/;
 		} else {
+		    # creation
 		    die "non-default mode or type\n"
 			unless $newmode =~ m/^100644$/ ||
 			       $oldmode =~ m/^100644$/;