move myvnc to separate module

nixops/ekman/myvnc.nix

@@ -0,0 +1,24 @@
+{ pkgs }:
+pkgs.writeScriptBin "myvnc" ''
+    #!${pkgs.runtimeShell}
+
+    uid=`id -u`
+    port=$((9000+$uid))
+    shell=`getent passwd $(id -un) | awk -F : '{print $NF}'`
+    # vnc=${pkgs.tigervnc}/bin/vncserver
+    vnc=/nix/store/czp2b60dwk75widi8y287hr0xx1wgv2a-tigervnc-1.10.1/bin/vncserver
+
+    case $1 in
+    -p|--port) shift; port=$1 ;;
+    kill|stop)
+        display=$($vnc -list | sed  -n 's/^\(:[0-9]\+\).*/\1/p'| head -1)
+        $vnc -kill $display
+        exit 0
+        ;;
+    esac
+    ps ax | sed '/grep/d' | grep "Xvnc.*-rfbport $port" >/dev/null 2>&1
+    [ $? = 1 ] && $vnc -rfbport $port
+    echo "Xvnc server is running on port $port."
+    exec $shell -i
+  ''
+