Nix environment deployment with built-in gems installation

Gemfile.lock

@@ -281,6 +281,7 @@ GEM
     method_source (1.0.0)
     mini_magick (4.11.0)
     mini_mime (1.1.5)
+    mini_portile2 (2.8.5)
     minitest (5.20.0)
     multi_xml (0.6.0)
     multipart-post (2.3.0)
@@ -296,6 +297,9 @@ GEM
     net-smtp (0.4.0)
       net-protocol
     nio4r (2.5.9)
+    nokogiri (1.15.4)
+      mini_portile2 (~> 2.8.2)
+      racc (~> 1.4)
     nokogiri (1.15.4-arm64-darwin)
       racc (~> 1.4)
     nokogiri (1.15.4-x86_64-darwin)
@@ -516,6 +520,7 @@ PLATFORMS
   arm64-darwin-20
   arm64-darwin-21
   arm64-darwin-22
+  ruby
   x86_64-darwin-18
   x86_64-darwin-19
   x86_64-darwin-20
@@ -604,4 +609,4 @@ RUBY VERSION
    ruby 3.2.2p53
 
 BUNDLED WITH
-   2.4.8
+   2.4.19

README.md

@@ -86,17 +86,20 @@ The complete [role description of a CASA volunteer](https://pgcasa.org/volunteer
 
 **Nix** 
 
-If you have [Nix](https://nixos.org) installed you can use
-the [flake.nix](flake.nix) configuration file located at the root of the
-project to build and develop within an environment without needing to install 
-`rvm`, `nodejs`, `yarn` or other tools separately. All you need is this file 
-to get the server up and running:
+If you have [Nix](https://nixos.org) installed you can use the [flake.nix](flake.nix)
+configuration file located at the root of the project to build and develop within an environment
+without needing to install `rvm`, `nodejs`, `yarn`, `postgresql` or other tools separately.
+The environment also uses the `gemset.nix` file to automatically download and install all the gems
+necessary to get the server up and running:
 
 1. Install [Nix](https://zero-to-nix.com/concepts/nix-installer)
-1. `cd` into casa
-1. `nix develop`
-1. `bundix` # to generate a a Gemfile lock that nix can understand
-1. `bundle install`
+2. Add the following to `~/.config/nix/nix.conf` or `/etc/nix/nix.conf`:
+```
+    experimental-features = nix-command flakes
+```
+3. `cd` into casa
+4. `nix-shell -p bundix --run "bundix -l"` to update the `gemset.nix` file
+5. `nix develop` and wait for the packages to be downloaded and the environment to be built
 
 Then you can setup the database and run the server.
 This will run on Linux and macOS.

flake.nix

@@ -37,6 +37,7 @@
         gemset =
           if builtins.pathExists ./gemset.nix then import ./gemset.nix else { };
 
+        gemConfig = { };
         # See available versions here: https://github.com/bobvanderlinden/nixpkgs-ruby/blob/master/ruby/versions.json
         ruby = pkgs."ruby-3.2.2";
 
@@ -52,7 +53,7 @@
         devShells = rec {
           default = dev;
           dev = pkgs.mkShell {
-            BUNDLE_PATH = "~/.gems";
+            BUNDLE_FORCE_RUBY_PLATFORM = "true";
             shellHook = ''
               export PS1='\n\[\033[1;34m\][💎:\w]\$\[\033[0m\] '
 
@@ -72,10 +73,13 @@
               then
                 pg_ctl start -l $PGLOG -o "--unix_socket_directories='$PGHOST'"
               fi
+
+              trap 'pg_ctl stop -D "$PGDATA" -s -m fast' EXIT
             '';
 
             buildInputs = [
               env
+              bundixcli
               pkgs.bundix
               pkgs.bundler-audit
               pkgs.direnv