From 5f9258f673404e784b450631b39ba433a1fda945 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 17 May 2015 14:16:23 +0100
Subject: [PATCH] dgit: Allow --deliberately-not-fast-forward to override
 dgit's fast forward check

---
 dgit | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/dgit b/dgit
index 5d239d69..3d362809 100755
--- a/dgit
+++ b/dgit
@@ -1658,7 +1658,8 @@ sub sign_changes ($) {
     }
 }
 
-sub dopush () {
+sub dopush ($) {
+    my ($forceflag) = @_;
     printdebug "actually entering push\n";
     prep_ud();
 
@@ -1737,7 +1738,6 @@ sub dopush () {
     responder_send_command("param head $head");
     responder_send_command("param csuite $csuite");
 
-    my $forceflag = deliberately('not-fast-forward') ? '+' : '';
     if ($forceflag && defined $lastpush_hash) {
 	git_for_each_tag_referring($lastpush_hash, sub {
 	    my ($objid,$fullrefname,$tagname) = @_;
@@ -1902,17 +1902,27 @@ sub cmd_push {
     if (check_for_git()) {
 	git_fetch_us();
     }
+    my $forceflag = '';
     if (fetch_from_archive()) {
-	is_fast_fwd(lrref(), 'HEAD') or
+	if (is_fast_fwd(lrref(), 'HEAD')) {
+	    # ok
+	} elsif (deliberately('not-fast-forward') ||
+		 deliberately('TEST-not-fast-forward-dgit-only')) {
+	    $forceflag = '+';
+	} else {
 	    fail "dgit push: HEAD is not a descendant".
 	        " of the archive's version.\n".
-		"$us: To overwrite it, use git merge -s ours ".lrref().".";
+		"$us: To overwrite its contents,".
+		" use git merge -s ours ".lrref().".\n".
+		"$us: To rewind history, if permitted by the archive,".
+		" use --deliberately-not-fast-forward";
+	}
     } else {
 	$new_package or
 	    fail "package appears to be new in this suite;".
 	        " if this is intentional, use --new";
     }
-    dopush();
+    dopush($forceflag);
 }
 
 #---------- remote commands' implementation ----------
-- 
2.30.2