$ git clone -n https://src.fedoraproject.org/rpms/yggdrasil.git /var/lib/mock/f41-build-854529-166886/root/chroot_tmpdir/scmroot/yggdrasil
Cloning into '/var/lib/mock/f41-build-854529-166886/root/chroot_tmpdir/scmroot/yggdrasil'...
$ git fetch origin ff84a26fcdd34abc8bdbf60dff5fed19f61697a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yggdrasil
 * [new ref]         ff84a26fcdd34abc8bdbf60dff5fed19f61697a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff84a26 Use systemd_sysusers_compat