$ git clone -n https://src.fedoraproject.org/rpms/perl-Prima.git /var/lib/mock/f41-build-side-1-2654838-27881/root/chroot_tmpdir/scmroot/perl-Prima
Cloning into '/var/lib/mock/f41-build-side-1-2654838-27881/root/chroot_tmpdir/scmroot/perl-Prima'...
$ git fetch origin 8aa91abe2f03c6f86a6e8098ded2335082495e13:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Prima
 * [new ref]         8aa91abe2f03c6f86a6e8098ded2335082495e13 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8aa91ab 1.74 bump