$ git clone -n https://src.fedoraproject.org/rpms/c2esp.git /var/lib/mock/f38-build-side-42-init-devel-585390-26111/root/chroot_tmpdir/scmroot/c2esp
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-585390-26111/root/chroot_tmpdir/scmroot/c2esp'...
$ git fetch origin b89a093c8070db0b3cfe81e74d32251b21eb4563:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/c2esp
 * [new ref]         b89a093c8070db0b3cfe81e74d32251b21eb4563 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b89a093 move to libcupsfilters-devel and libppd-devel