$ git clone -n https://src.fedoraproject.org/rpms/rust-roxmltree.git /var/lib/mock/f38-build-side-43-rust-devel-1412041-31436/root/chroot_tmpdir/scmroot/rust-roxmltree
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1412041-31436/root/chroot_tmpdir/scmroot/rust-roxmltree'...
$ git fetch origin 6fc24a2220f999bdbbadb8d2ae0938081a72395f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-roxmltree
 * [new ref]         6fc24a2220f999bdbbadb8d2ae0938081a72395f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fc24a2 Update to 0.18.0