$ git clone -n https://src.fedoraproject.org/rpms/rust-kurbu5-kdb-sys.git /var/lib/mock/f45-build-42797-796/root/chroot_tmpdir/scmroot/rust-kurbu5-kdb-sys
Cloning into '/var/lib/mock/f45-build-42797-796/root/chroot_tmpdir/scmroot/rust-kurbu5-kdb-sys'...
$ git fetch origin 8ef85a34cc1bc5bd8b6fd65da6bb61c8d1923a3c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-kurbu5-kdb-sys
 * [new ref]         8ef85a34cc1bc5bd8b6fd65da6bb61c8d1923a3c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ef85a3 Update to version 0.1.4