$ git clone -n https://src.fedoraproject.org/rpms/systemd.git /var/lib/mock/f42-build-867486-175514/root/chroot_tmpdir/scmroot/systemd
Cloning into '/var/lib/mock/f42-build-867486-175514/root/chroot_tmpdir/scmroot/systemd'...
$ git fetch origin d0973df8633edfe039c8040d1773f7e89c7dd2f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/systemd
 * [new ref]         d0973df8633edfe039c8040d1773f7e89c7dd2f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d0973df Backport patch to emit audit events from systemd-sysusers