$ git clone -n https://src.fedoraproject.org/rpms/kf6-solid.git /var/lib/mock/f42-build-side-1-3582336-46884/root/chroot_tmpdir/scmroot/kf6-solid
Cloning into '/var/lib/mock/f42-build-side-1-3582336-46884/root/chroot_tmpdir/scmroot/kf6-solid'...
$ git fetch origin 7a78defc39f70d245203f5c1c6f31267a3a7a3b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-solid
 * [new ref]         7a78defc39f70d245203f5c1c6f31267a3a7a3b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7a78def 6.16.0