$ git clone -n https://src.fedoraproject.org/rpms/mtd-utils.git /var/lib/mock/f45-build-19318-547/root/chroot_tmpdir/scmroot/mtd-utils
Cloning into '/var/lib/mock/f45-build-19318-547/root/chroot_tmpdir/scmroot/mtd-utils'...
$ git fetch origin 0d66995322f38c266194e7f8f473bdecfa96f8ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mtd-utils
 * [new ref]         0d66995322f38c266194e7f8f473bdecfa96f8ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d66995 2.3.1