$ git clone -n https://src.fedoraproject.org/rpms/kf6-sonnet.git /var/lib/mock/f41-build-side-114591-60926034-6585985/root/chroot_tmpdir/scmroot/kf6-sonnet
Cloning into '/var/lib/mock/f41-build-side-114591-60926034-6585985/root/chroot_tmpdir/scmroot/kf6-sonnet'...
$ git fetch origin b15dc78bac1fde64f27c3519a9af41be01b9367c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-sonnet
 * [new ref]         b15dc78bac1fde64f27c3519a9af41be01b9367c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b15dc78 6.16.0