$ git clone -n https://src.fedoraproject.org/rpms/genromfs.git /var/lib/mock/f45-build-9749-408/root/chroot_tmpdir/scmroot/genromfs
Cloning into '/var/lib/mock/f45-build-9749-408/root/chroot_tmpdir/scmroot/genromfs'...
$ git fetch origin 8f5756c28b5126be3c6733ecb6bfe74a4125da93:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/genromfs
 * [new ref]         8f5756c28b5126be3c6733ecb6bfe74a4125da93 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f5756c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild