$ git clone -n https://src.fedoraproject.org/rpms/systemd.git /var/lib/mock/f41-build-861821-170416/root/chroot_tmpdir/scmroot/systemd
Cloning into '/var/lib/mock/f41-build-861821-170416/root/chroot_tmpdir/scmroot/systemd'...
$ git fetch origin 3ceacb33df4ec0569436d851f585767f1bcf96a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/systemd
 * [new ref]         3ceacb33df4ec0569436d851f585767f1bcf96a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ceacb3 Use %systemd_preun in systemd-resolved