git-svn: better error reporting if --follow-parent fails

This will be useful to me when I try more special-cases
of parent-tracking.

Signed-off-by: Eric Wong <normalperson@yhbt.net>

diff --git a/git-svn.perl b/git-svn.perl
index a70e7b911014b0b74e8e263ca888a911d41405d7..de026b4e4ccc607adc347797f50e9f3ccded3a83 100755 (executable)
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -1056,10 +1056,12 @@ sub revisions_eq {
 
 sub find_parent_branch {
        my ($self, $paths, $rev) = @_;
+       return undef unless $::_follow_parent;
 
        # look for a parent from another branch:
-       my $i = $paths->{'/'.$self->rel_path} or return;
-       my $branch_from = $i->copyfrom_path or return;
+       my $abs_path = '/'.$self->rel_path;
+       my $i = $paths->{$abs_path} or goto not_found;
+       my $branch_from = $i->copyfrom_path or goto not_found;
        my $r = $i->copyfrom_rev;
        my $repos_root = $self->ra->{repos_root};
        my $url = $self->ra->{url};
@@ -1118,7 +1120,16 @@ sub find_parent_branch {
                }
                return $self->make_log_entry($rev, [$parent], $ed);
        }
-       print STDERR "Branch parent not found...\n";
+not_found:
+       print STDERR "Branch parent for path: '$abs_path' not found\n";
+       return undef unless $paths;
+       foreach my $p (sort keys %$paths) {
+               print STDERR '  ', $p->action, '  ', $p;
+               if (my $cp_from = $p->copyfrom_path) {
+                       print STDERR "(from $cp_from:", $p->copyfrom_rev, ')';
+               }
+               print STDERR "\n";
+       }
        return undef;
 }