$ git clone -n https://src.fedoraproject.org/rpms/rust-crc64.git /var/lib/mock/f38-build-side-43-rust-devel-1411403-31435/root/chroot_tmpdir/scmroot/rust-crc64
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1411403-31435/root/chroot_tmpdir/scmroot/rust-crc64'...
$ git fetch origin 94307fde21af4a5899e86bd7089b3461c1a49103:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-crc64
 * [new ref]         94307fde21af4a5899e86bd7089b3461c1a49103 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 94307fd Update to version 2.0.0