$ git clone -n https://src.fedoraproject.org/rpms/pioneer.git /var/lib/mock/f39-build-2551256-61915/root/chroot_tmpdir/scmroot/pioneer
Cloning into '/var/lib/mock/f39-build-2551256-61915/root/chroot_tmpdir/scmroot/pioneer'...
$ git fetch origin 3a447d527054ab1a6c23dcebaf7f2028a51b746a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pioneer
 * [new ref]         3a447d527054ab1a6c23dcebaf7f2028a51b746a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3a447d5 Modify DATADIR path