$ git clone -n https://src.fedoraproject.org/rpms/systemd.git /var/lib/mock/f41-build-846598-163186/root/chroot_tmpdir/scmroot/systemd
Cloning into '/var/lib/mock/f41-build-846598-163186/root/chroot_tmpdir/scmroot/systemd'...
$ git fetch origin d38cacfd3af154d18f4ead14db8fb8d3108498ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/systemd
 * [new ref]         d38cacfd3af154d18f4ead14db8fb8d3108498ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d38cacf Version 256.5