$ git clone -n https://src.fedoraproject.org/rpms/Perlbal.git /var/lib/mock/f39-build-1937368-43135/root/chroot_tmpdir/scmroot/Perlbal
Cloning into '/var/lib/mock/f39-build-1937368-43135/root/chroot_tmpdir/scmroot/Perlbal'...
$ git fetch origin 0787a28c20164e70c9e61e94318d02d4d118b86a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/Perlbal
 * [new ref]         0787a28c20164e70c9e61e94318d02d4d118b86a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0787a28 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild