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-rw-r--r--lib/PublicInbox/Git.pm3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm
index a61cb31b..b655921b 100644
--- a/lib/PublicInbox/Git.pm
+++ b/lib/PublicInbox/Git.pm
@@ -92,7 +92,8 @@ sub _bidi_pipe {
                 fcntl($in_w, 1031, 4096) if $batch eq '--batch-check';
         }
 
-        my @cmd = ('git', "--git-dir=$self->{git_dir}", qw(cat-file), $batch);
+        my @cmd = (qw(git), "--git-dir=$self->{git_dir}",
+                        qw(-c core.abbrev=40 cat-file), $batch);
         my $redir = { 0 => fileno($out_r), 1 => fileno($in_w) };
         if ($err) {
                 open(my $fh, '+>', undef) or fail($self, "open.err failed: $!");