$ git clone -n https://src.fedoraproject.org/rpms/kdecoration.git /var/lib/mock/f42-build-870603-177260/root/chroot_tmpdir/scmroot/kdecoration
Cloning into '/var/lib/mock/f42-build-870603-177260/root/chroot_tmpdir/scmroot/kdecoration'...
$ git fetch origin c98b6c64f4121b431535060ed0c43d372f6dac7a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdecoration
 * [new ref]         c98b6c64f4121b431535060ed0c43d372f6dac7a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c98b6c6 6.3.0