From 31ca5cbc38b975621d01dd5c5fd5cf6b8f539ee4 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Wed, 25 Oct 2017 18:33:36 +0100
Subject: [PATCH] git-debrebase: bugfixes

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 git-debrebase | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/git-debrebase b/git-debrebase
index 139602fc..22cdfa64 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -154,7 +154,8 @@ sub in_workarea ($) {
     my ($sub) = @_;
     changedir $workarea;
     my $r = eval { $sub->(); };
-    changedir $maindir;
+    { local $@; changedir $maindir; }
+    die $@ if $@;
 }
 
 sub fresh_workarea () {
@@ -627,9 +628,14 @@ sub walk ($;$$) {
  
     my $committer_authline = calculate_committer_authline();
 
+    printdebug "WALK REBUILD $build ".(scalar @processed)."\n";
+
+    confess "internal error" unless $build eq (pop @processed)->{CommitId};
+
     in_workarea sub {
 	mkdir $rd or $!==EEXIST or die $!;
 	my $current_method;
+	runcmd @git, qw(read-tree), $build;
 	foreach my $cl (qw(Debian), (reverse @brw_cl),
 			{ SpecialMethod => 'RecordBreakwaterTip' },
 			qw(Upstream), (reverse @upp_cl)) {
@@ -640,6 +646,8 @@ sub walk ($;$$) {
 	    my $method = $cl->{SpecialMethod} // $current_method;
 	    my @parents = ($build);
 	    my $cltree = $cl->{CommitId};
+	    printdebug "WALK BUILD ".($cltree//'undef').
+		" $method (rewriting=$rewriting)\n";
 	    if ($method eq 'Debian') {
 		$read_tree_debian->($cltree);
 	    } elsif ($method eq 'Upstream') {
@@ -685,7 +693,7 @@ sub walk ($;$$) {
     };
 
     my $final_check = get_differs $build, $input;
-    die sprintf "internal error %#x", $final_check
+    die sprintf "internal error %#x %s %s", $final_check, $build, $input
 	if $final_check & ~D_PAT_ADD;
 
     return ($build, $breakwater);
-- 
2.30.2