$ git clone -n https://src.fedoraproject.org/rpms/libportal.git /var/lib/mock/f40-build-2008134-45338/root/chroot_tmpdir/scmroot/libportal
Cloning into '/var/lib/mock/f40-build-2008134-45338/root/chroot_tmpdir/scmroot/libportal'...
$ git fetch origin ff8db43e8a4c4a95f1a84c85922c548adeed2278:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libportal
 * [new ref]         ff8db43e8a4c4a95f1a84c85922c548adeed2278 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff8db43 Migrate to SPDX license