$ git clone -n https://src.fedoraproject.org/rpms/kdecoration.git /var/lib/mock/f42-build-side-1-3498291-45962/root/chroot_tmpdir/scmroot/kdecoration
Cloning into '/var/lib/mock/f42-build-side-1-3498291-45962/root/chroot_tmpdir/scmroot/kdecoration'...
$ git fetch origin 667683b46b6a87ceb56fcd2dd7d7dd2366cb82c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdecoration
 * [new ref]         667683b46b6a87ceb56fcd2dd7d7dd2366cb82c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 667683b 6.3.4