feat(scripts): Add a script to easily launch a vm with port forwarding

scripts/default.nix

@@ -6,7 +6,8 @@ let
       bash
       colmena
       coreutils
-      git;
+      git
+      jq;
   };
 
   mkShellScript = name: (pkgs.substituteAll ({
@@ -22,6 +23,7 @@ let
 
   scripts = [
     "ns-update"
+    "launch-vm"
     # "mk-backup-key"
     # "wg-setup"
   ];

scripts/launch-vm.sh

@@ -0,0 +1,37 @@
+#!@bash@/bin/bash
+# shellcheck shell=bash
+set -o errexit
+set -o nounset
+set -o pipefail
+
+MACHINE=""
+HOSTFWD=""
+
+while getopts 'p:o:h' opt; do
+  case "$opt" in
+    p)
+      HOSTFWD=",hostfwd=tcp::$OPTARG$HOSTFWD"
+      ;;
+
+    o)
+      MACHINE="$OPTARG"
+      ;;
+
+    h|?)
+      echo "Usage: $(basename "$0") [-p hostport-:guestport] -o MACHINE"
+      exit 1
+      ;;
+  esac
+done
+shift "$((OPTIND -1))"
+
+if [ -z "$MACHINE" ]; then echo "-o option needed"; exit 1; fi
+
+DRV_PATH=$(@colmena@/bin/colmena eval --instantiate -E "{nodes, ...}: nodes.$MACHINE.config.system.build.vm")
+
+echo "Realising $DRV_PATH"
+RESULT=$(nix-store -r "$DRV_PATH")
+
+echo "Built $RESULT, launching VM ..."
+
+"$RESULT/bin/run-$MACHINE-vm" -device e1000,netdev=net0 -netdev "user,id=net0$HOSTFWD"