$ git clone -n https://src.fedoraproject.org/rpms/perl-Lucy.git /var/lib/mock/f41-build-780111-13558/root/chroot_tmpdir/scmroot/perl-Lucy
Cloning into '/var/lib/mock/f41-build-780111-13558/root/chroot_tmpdir/scmroot/perl-Lucy'...
$ git fetch origin 487c1668834055123dd9887b17fbde0403ad7423:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Lucy
 * [new ref]         487c1668834055123dd9887b17fbde0403ad7423 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 487c166 Eliminate use of obsolete %patchN syntax (#2283636)