$ git clone -n https://src.fedoraproject.org/rpms/rust-kurbu5-sys.git /var/lib/mock/f45-build-42812-796/root/chroot_tmpdir/scmroot/rust-kurbu5-sys
Cloning into '/var/lib/mock/f45-build-42812-796/root/chroot_tmpdir/scmroot/rust-kurbu5-sys'...
$ git fetch origin 52a91e74b630aae8f8ffb1d74d20c889bde7ee19:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-kurbu5-sys
 * [new ref]         52a91e74b630aae8f8ffb1d74d20c889bde7ee19 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52a91e7 Update to version 0.1.4