$ git clone -n https://src.fedoraproject.org/rpms/kdecoration.git /var/lib/mock/f40-build-788723-135313/root/chroot_tmpdir/scmroot/kdecoration
Cloning into '/var/lib/mock/f40-build-788723-135313/root/chroot_tmpdir/scmroot/kdecoration'...
$ git fetch origin ced30069a2570089ae2a10e70c8dfcad521b1d89:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdecoration
 * [new ref]         ced30069a2570089ae2a10e70c8dfcad521b1d89 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ced3006 6.0.0