$ git clone -n https://src.fedoraproject.org/rpms/picom.git /var/lib/mock/f41-build-858957-168509/root/chroot_tmpdir/scmroot/picom
Cloning into '/var/lib/mock/f41-build-858957-168509/root/chroot_tmpdir/scmroot/picom'...
$ git fetch origin 72f0378bdd46e69bbdc725693f15c85bed2d4353:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/picom
 * [new ref]         72f0378bdd46e69bbdc725693f15c85bed2d4353 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 72f0378 Update to 12.3 upstream release