X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=git-debrebase;h=dc55df8c821e93a37961d859b64ac68ba7881a7c;hb=8d534ac9006cef95a5b2e9e882039bcabb945543;hp=e862d4ee5a88747e7e634e79713885b3a0cf370d;hpb=e6d6d6bde077f1cc3611445526ce4429be7f4968;p=dgit.git

diff --git a/git-debrebase b/git-debrebase
index e862d4ee..dc55df8c 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -263,7 +263,7 @@ sub rm_subdir_cached ($) {
 sub read_tree_subdir ($$) {
     my ($subdir, $new_tree_object) = @_;
     rm_subdir_cached $subdir;
-    runcmd @git, qw(read-tree), "--prefix=$subdir/";
+    runcmd @git, qw(read-tree), "--prefix=$subdir/", $new_tree_object;
 }
 
 # classify returns an info hash like this
@@ -473,7 +473,7 @@ sub walk ($;$$);
 sub walk ($;$$) {
     my ($input,
 	$nogenerate,$report) = @_;
-    # => ($tip, $breakwater_tip)
+    # => ($tip, $breakwater_tip, $last_upstream_merge_in_breakwater)
     # (or nothing, if $nogenerate)
 
     # go through commits backwards
@@ -529,6 +529,8 @@ sub walk ($;$$) {
 	no warnings qw(exiting); last;
     };
 
+    my $last_upstream_update;
+
     for (;;) {
 	$cl = classify $cur;
 	my $ty = $cl->{Type};
@@ -546,6 +548,7 @@ sub walk ($;$$) {
 	    $cur = $p0;
 	    next;
 	} elsif ($ty eq 'BreakwaterStart') {
+            $last_upstream_update = $cur;
 	    $build_start->('FirstPackaging', $cur);
 	} elsif ($ty eq 'Upstream') {
 	    push @upp_cl, $cl;
@@ -570,6 +573,7 @@ sub walk ($;$$) {
 	    $cur = $contrib;
 	    next;
 	} elsif ($ty eq 'BreakwaterUpstreamMerge') {
+            $last_upstream_update = $cur;
 	    $build_start->("PreviousBreakwater", $cur);
 	} elsif ($ty eq 'DgitImportUnpatched') {
 	    my $pm = $pseudomerges[-1];
@@ -623,6 +627,7 @@ sub walk ($;$$) {
 		$prline->(" Import");
 		$rewrite_from_here->();
 		$upp_limit //= $#upp_cl; # further, deeper, patches discarded
+                die 'BUG $upp_limit is not used anywhere?';
 		$cur = $ovwr;
 		next;
 	    } else {
@@ -652,6 +657,7 @@ sub walk ($;$$) {
     my $read_tree_debian = sub {
 	my ($treeish) = @_;
 	read_tree_subdir 'debian', "$treeish:debian";
+        rm_subdir_cached 'debian/patches';
     };
     my $read_tree_upstream = sub {
 	my ($treeish) = @_;
@@ -728,6 +734,9 @@ sub walk ($;$$) {
 	    my $newcommit = cmdoutput @cmd;
 	    confess "$ch ?" unless $rewriting or $newcommit eq $cl->{CommitId};
 	    $build = $newcommit;
+            if (grep { $method eq $_ } qw(DgitImportUpstreamUpdate)) {
+                $last_upstream_update = $cur;
+            }
 	}
     };
 
@@ -735,7 +744,7 @@ sub walk ($;$$) {
     die sprintf "internal error %#x %s %s", $final_check, $build, $input
 	if $final_check & ~D_PAT_ADD;
 
-    return ($build, $breakwater);
+    return ($build, $breakwater, $last_upstream_update);
 }
 
 sub get_head () { return git_rev_parse qw(HEAD); }
@@ -823,10 +832,13 @@ sub cmd_new_upstream_v0 () {
     # now we need to investigate the branch this generates the
     # laundered version but we don't switch to it yet
     my $old_head = get_head();
-    my ($old_laundered_tip,$old_bw) = walk $old_head;
+    my ($old_laundered_tip,$old_bw,$old_upstream_update) = walk $old_head;
 
     my $old_bw_cl = classify $old_bw;
-    my $old_upstream = parsecommit $old_bw_cl->{OrigParents}[0]{CommitId};
+    my $old_upstream_update_cl = classify $old_upstream_update;
+    confess unless $old_upstream_update_cl->{OrigParents};
+    my $old_upstream = parsecommit
+        $old_upstream_update_cl->{OrigParents}[0]{CommitId};
 
     my $problems = 0;
     my $problem = sub {