$ git clone -n https://src.fedoraproject.org/rpms/python-tempora.git /var/lib/mock/f39-build-1426413-31596/root/chroot_tmpdir/scmroot/python-tempora
Cloning into '/var/lib/mock/f39-build-1426413-31596/root/chroot_tmpdir/scmroot/python-tempora'...
$ git fetch origin 6283ddf005c08d7dea0edf660b9f3ff41225c326:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-tempora
 * [new ref]         6283ddf005c08d7dea0edf660b9f3ff41225c326 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6283ddf update to 5.2.1 (rhbz#2157607)