dgit: Give better advice if .dsc/.changes signing fails

If no changes are needed to the package, user may indeed just debsign
and dput.  Closes:#844131.

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

1 files changed, 6 insertions, 2 deletions

diff --git a/dgit b/dgit
index ee82cd0..224d85b 100755
--- a/dgit
+++ b/dgit
@@ -3995,8 +3995,12 @@ END
     runcmd_ordryrun @git, qw(update-ref -m), 'dgit push', lrref(), $dgithead;
 
     supplementary_message(<<'END');
-Push failed, after updating the remote git repository.
-If you want to try again, you must use a new version number.
+Push failed, while obtaining signatures on the .changes and .dsc.
+If it was just that the signature failed, you may try again by using
+debsign by hand to sign the changes
+   $changesfile
+and then dput to complete the upload.
+If you need to change the package, you must use a new version number.
 END
     if ($we_are_responder) {
 	my $dryrunsuffix = act_local() ? "" : ".tmp";