$ git clone -n https://src.fedoraproject.org/rpms/kwin.git /var/lib/mock/f42-build-side-1-3584586-46894/root/chroot_tmpdir/scmroot/kwin
Cloning into '/var/lib/mock/f42-build-side-1-3584586-46894/root/chroot_tmpdir/scmroot/kwin'...
$ git fetch origin eff52a244740f381b4f2da1408901d2955f82b86:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kwin
 * [new ref]         eff52a244740f381b4f2da1408901d2955f82b86 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eff52a2 Merge branch 'rawhide' into f42