$ git clone -n https://src.fedoraproject.org/rpms/xfconf.git /var/lib/mock/f39-build-1850568-42245/root/chroot_tmpdir/scmroot/xfconf
Cloning into '/var/lib/mock/f39-build-1850568-42245/root/chroot_tmpdir/scmroot/xfconf'...
$ git fetch origin cfa1a913fecf31ff0a5e85aa129becbb16e62135:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfconf
 * [new ref]         cfa1a913fecf31ff0a5e85aa129becbb16e62135 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cfa1a91 Update to v4.18.3