add some helper scripts

packages/netali-configure-net-ruby/default.nix

@@ -0,0 +1,20 @@
+{ writeShellScriptBin, iproute2 }:
+
+writeShellScriptBin "netali-configure-net-ruby" ''
+  if [[ $# -ne 2 ]]; then
+    echo "Usage: netali-configure-net-ruby [interface] [last-ip-block]"
+    echo ""
+    echo "interface:       name of the network interface to configure"
+    echo "last-ip-block:   last block of the IPv6 address of this host"
+    exit 1
+  fi
+
+  INTERFACE=$1
+  LAST_IP_BLOCK=$2
+
+  ${iproute2}/bin/ip link set up $INTERFACE
+  ${iproute2}/bin/ip a a 2001:67c:a6c:a::$LAST_IP_BLOCK/64 dev $INTERFACE
+  ${iproute2}/bin/ip r a default via fe80::1 dev $INTERFACE
+
+  echo "nameserver 2606:4700:4700::1111" > /etc/resolv.conf
+''