$ git clone -n https://src.fedoraproject.org/rpms/rng-tools.git /var/lib/mock/f45-build-34570-688/root/chroot_tmpdir/scmroot/rng-tools
Cloning into '/var/lib/mock/f45-build-34570-688/root/chroot_tmpdir/scmroot/rng-tools'...
$ git fetch origin b19b48062c16957c24d745ace925724b603fe5e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rng-tools
 * [new ref]         b19b48062c16957c24d745ace925724b603fe5e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b19b480 Rebuilt for the recent openssl-pkcs11 update