1 files changed, 5 insertions, 0 deletions
diff --git a/lib/PublicInbox/LeiMirror.pm b/lib/PublicInbox/LeiMirror.pm
index b30cc519..cc5ea1d2 100644
--- a/lib/PublicInbox/LeiMirror.pm
+++ b/lib/PublicInbox/LeiMirror.pm
@@ -995,6 +995,7 @@ sub try_manifest {
          }
          my $ft = File::Temp->new(TEMPLATE => '.manifest-XXXX', %opt);
          my $cmd = $curl->for_uri($lei, $uri, qw(-f -R -o), $ft->filename);
+        push(@$cmd, '-z', $manifest) if -f $manifest;
          my $mf_url = "$uri";
          %opt = map { $_ => $lei->{$_} } (0..2);
          my $cerr = run_reap($lei, $cmd, \%opt);
@@ -1002,6 +1003,10 @@ sub try_manifest {
                  return try_scrape($self) if ($cerr >> 8) == 22; # 404 missing
                  return $lei->child_error($cerr, "@$cmd failed");
          }
+
+        # bail out if curl -z/--timecond hit 304 Not Modified, $ft will be empty
+        return $lei->qerr("# $manifest unchanged") if -f $manifest && !-s $ft;
+
          my $m = eval { decode_manifest($ft, $ft, $uri) };
          if ($@) {
                  warn $@;