Add test whether executing host is in .rhosts to IBM PE MPI launcher.

util/mpi_launch_poe

@@ -5,9 +5,14 @@ if [ x"$1" = x-n ]; then
    export MP_PROCS
    shift
 fi
+hostname=$(hostname)
+if ! grep "$hostname" $HOME/.rhosts 2>/dev/null >&2 ; then
+  echo "Error: current hostname not in ~/.rhosts!" >&2
+  exit 1
+fi
 MP_HOSTFILE=`mktemp -t hostfile.tmpXXXXXX`
 trap '/bin/rm -f $MP_HOSTFILE' EXIT
 export MP_HOSTFILE
-yes "`hostname`" | head -n ${MP_PROCS-1} >$MP_HOSTFILE
+yes "$hostname" | head -n ${MP_PROCS-1} >$MP_HOSTFILE
 
 poe "$@"