dgit: split brain reorg: Check $split_brain against $do_split_brain

I think by now, $do_split_brain is always set early enough that
$split_brain here implies $do_split_brain.  And if $split_brain were
not set but $do_split_brain was, that would mean we hadn't actually
done the necessary work (constructing the and switching to the
dgit-view branch in the playtree or computing $dgithead).

Double check this with a couple of calls to confess.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/dgit b/dgit
index 4bc088e..2b1a293 100755
--- a/dgit
+++ b/dgit
@@ -4578,6 +4578,7 @@ END
     my $r = system @diffcmd;
     if ($r) {
 	if ($r==256) {
+	    confess unless !!$split_brain == !!$do_split_brain;
 	    my $referent = $split_brain ? $dgithead : 'HEAD';
 	    my $diffs = cmdoutput @git, qw(diff --stat), $tree, $dgithead;
 
@@ -6778,6 +6779,7 @@ sub build_source {
         # If we are in split brain, there is already a playtree with
         # the thing we should package into a .dsc (thanks to quilt
         # fixup).  If not, make a playtree
+	confess unless !!$split_brain == !!$do_split_brain;
         prep_ud() unless $split_brain;
         changedir $playground;
         unless ($split_brain) {