$ git clone -n https://src.fedoraproject.org/rpms/volume_key.git /var/lib/mock/f41-build-725984-13125/root/chroot_tmpdir/scmroot/volume_key
Cloning into '/var/lib/mock/f41-build-725984-13125/root/chroot_tmpdir/scmroot/volume_key'...
$ git fetch origin 291e835b6506fceabb8d31e52d710029679a14dd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/volume_key
 * [new ref]         291e835b6506fceabb8d31e52d710029679a14dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 291e835 Eliminate use of obsolete %patchN syntax (#2283636)