$ git clone -n https://src.fedoraproject.org/rpms/systemd.git /var/lib/mock/f41-build-848029-164378/root/chroot_tmpdir/scmroot/systemd
Cloning into '/var/lib/mock/f41-build-848029-164378/root/chroot_tmpdir/scmroot/systemd'...
$ git fetch origin ce99022f7b7c6b545cdbfac2436e578d41ca3162:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/systemd
 * [new ref]         ce99022f7b7c6b545cdbfac2436e578d41ca3162 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce99022 Version 256.6