$ git clone -n https://src.fedoraproject.org/rpms/rust-derive_utils.git /var/lib/mock/f45-build-41246-780/root/chroot_tmpdir/scmroot/rust-derive_utils
Cloning into '/var/lib/mock/f45-build-41246-780/root/chroot_tmpdir/scmroot/rust-derive_utils'...
$ git fetch origin 6aecf4a8d4541079586883a7caa44f2ce031239c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-derive_utils
 * [new ref]         6aecf4a8d4541079586883a7caa44f2ce031239c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6aecf4a Update to version 0.16.0