$ git clone -n https://src.fedoraproject.org/rpms/rust-tiny-keccak.git /var/lib/mock/f45-build-45474-823/root/chroot_tmpdir/scmroot/rust-tiny-keccak
Cloning into '/var/lib/mock/f45-build-45474-823/root/chroot_tmpdir/scmroot/rust-tiny-keccak'...
$ git fetch origin 216d7e0f9c2fdb26691547ae7b59b093b02045e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tiny-keccak
 * [new ref]         216d7e0f9c2fdb26691547ae7b59b093b02045e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 216d7e0 Regenerate with rust2rpm v28