lib/PublicInbox/Git.pm | 7 +++++++
 t/solver_git.t         | 9 ++++++++-

diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm
index a756684a70355b6435b26b753f1dc6593e5481fa..265c3fb4507a1173de3d485d6de5cf332976a335 100644
--- a/lib/PublicInbox/Git.pm
+++ b/lib/PublicInbox/Git.pm
@@ -296,6 +296,13 @@ 	}
 	local_nick($self);
 }
 
+sub commit_title ($$) {
+	my ($self, $oid) = @_; # PublicInbox::Git, $sha1hex
+	my $buf = cat_file($self, $oid) or return;
+	utf8::decode($$buf);
+	($$buf =~ /\r?\n\r?\n([^\r\n]+)\r?\n?/)[0]
+}
+
 1;
 __END__
 =pod
diff --git a/t/solver_git.t b/t/solver_git.t
index 8de63988e9c51ce677a41b2e9752891b8824f2cc..6f0ce777477b65a3a2ccdf41e612dc69095324b2 100644
--- a/t/solver_git.t
+++ b/t/solver_git.t
@@ -40,7 +40,14 @@ }
 
 deliver_patch('t/solve/0001-simple-mod.patch');
 
-$ibx->{-repo_objs} = [ PublicInbox::Git->new($git_dir) ];
+my $git = PublicInbox::Git->new($git_dir);
+is('public-inbox 1.0.0',
+	$git->commit_title('cb7c42b1e15577ed2215356a2bf925aef59cdd8d'),
+	'commit_title works on 1.0.0');
+
+is(undef, $git->commit_title('impossible'), 'undef on impossible object');
+
+$ibx->{-repo_objs} = [ $git ];
 my $res;
 my $solver = PublicInbox::SolverGit->new($ibx, sub { $res = $_[0] });
 open my $log, '+>>', "$mainrepo/solve.log" or die "open: $!";