From 099608874f16c22a774ff9f427a8f172c84c66f9 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sat, 11 Aug 2018 12:25:20 +0100
Subject: [PATCH] git-debrebase: keycommits: Handle merged-breakwater commits

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 git-debrebase | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/git-debrebase b/git-debrebase
index 8ddf18da..672551d5 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -810,6 +810,21 @@ sub classify ($) {
     return $classify->("VanillaMerge");
 }
 
+sub keycommits ($;$$$$$);
+
+sub mergedbreakwaters_anchor ($) {
+    my ($cl) = @_;
+    my $best_anchor;
+    foreach my $p (@{ $cl->{Parents} }) {
+	my ($panchor, $pbw) = keycommits $p->{CommitId},
+	    undef,undef,undef,undef, 1;
+	$best_anchor = $panchor
+	    if !defined $best_anchor
+	    or is_fast_fwd $best_anchor, $panchor;
+    }
+    return $best_anchor;
+}
+
 sub keycommits ($;$$$$$) {
     my ($head, $furniture, $unclean, $trouble, $fatal, $claimed_bw) = @_;
     # => ($anchor, $breakwater)
@@ -901,6 +916,8 @@ sub keycommits ($;$$$$$) {
 	    $x->($trouble, 'vanillamerge',
 		 "found vanilla merge"," ($head)");
 	    return (undef,undef);
+	} elsif ($ty eq 'MergedBreakwaters') {
+	    $found_anchor->(mergedbreakwaters_anchor $cl);
 	} else {
 	    $x->($fatal, 'unprocessable',
 		 "found unprocessable commit, cannot cope: $cl->{Why}",
-- 
2.30.2