porcorosso: add javaws bin that drops into a FHS env.

This allows me to use Supermicro's BMC, which appears to drop a
stunnel binary into /tmp and then execute it, which doesn't work
properly in Nix because nothing is where it is expected to be.

default.nix

@@ -13,6 +13,7 @@ in fix (self:
 
     third_party = import ./third_party ch;
     ops = import ./ops ch;
+    nix = import ./nix ch;
 
     lib = self.third_party.nixpkgs.lib;
   })

nix/default.nix

@@ -0,0 +1,3 @@
+args: {
+  pkgs = import ./pkgs args;
+}

nix/pkgs/default.nix

@@ -0,0 +1,3 @@
+args: {
+  javaws-env = import ./javaws-env.nix args;
+}

nix/pkgs/javaws-env.nix

@@ -0,0 +1,9 @@
+{ pkgs, ... }:
+pkgs.buildFHSUserEnv {
+  name = "javaws-env";
+  targetPkgs = pkgs: (with pkgs;
+    [
+      adoptopenjdk-icedtea-web
+    ]);
+  runScript = "javaws";
+}

ops/nixos/porcorosso/default.nix

@@ -185,6 +185,12 @@ in {
       uid = 1000;
       extraGroups = [ "wheel" "networkmanager" ];
       hashedPassword = secrets.passwordHashes.root;
+      packages = [
+        (pkgs.writeScriptBin "javaws" ''
+          #!/bin/sh
+          exec ${depot.nix.pkgs.javaws-env}/bin/javaws-env "$@"
+        '')
+      ];
     };
   };