$ git clone -n https://src.fedoraproject.org/rpms/rust-kurbu5-rs.git /var/lib/mock/f45-build-42802-796/root/chroot_tmpdir/scmroot/rust-kurbu5-rs
Cloning into '/var/lib/mock/f45-build-42802-796/root/chroot_tmpdir/scmroot/rust-kurbu5-rs'...
$ git fetch origin 1509661f4b8cb145b3e66467487ea9e17f61b3e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-kurbu5-rs
 * [new ref]         1509661f4b8cb145b3e66467487ea9e17f61b3e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1509661 Update to version 0.1.4