$ git clone -n https://src.fedoraproject.org/rpms/kwin-x11.git /var/lib/mock/f42-build-side-1-3577605-46813/root/chroot_tmpdir/scmroot/kwin-x11
Cloning into '/var/lib/mock/f42-build-side-1-3577605-46813/root/chroot_tmpdir/scmroot/kwin-x11'...
$ git fetch origin c7e04686baed94be305ad04c3fcaf72087204660:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kwin-x11
 * [new ref]         c7e04686baed94be305ad04c3fcaf72087204660 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c7e0468 Update to 6.4.1.