feat(build): add flag to export fully evaluated config from nix (#37)

Author: IceDBorn

build.sh

@@ -1,5 +1,5 @@
 #! /usr/bin/env nix-shell
-#! nix-shell -i bash -p git nh nixfmt-rfc-style rsync
+#! nix-shell -i bash -p git jq jsonfmt nh nixfmt-rfc-style rsync
 
 ICEDOS_DIR="/tmp/icedos"
 CONFIG="$ICEDOS_DIR/configuration-location"
@@ -23,6 +23,10 @@ while [[ $# -gt 0 ]]; do
       action="build"
       shift
       ;;
+    --export-full-config)
+      export_full_config=1
+      shift
+      ;;
     --update)
       update="1"
       update_repos="1"
@@ -100,6 +104,13 @@ nixfmt "$FLAKE"
 rm $ICEDOS_FLAKE_INPUTS
 unset ICEDOS_FLAKE_INPUTS
 
+if [ "$export_full_config" == "1" ]; then
+  ICEDOS_STAGE="genflake" nix eval $trace --file "./lib/genflake.nix" evaluatedConfig | nixfmt | jq -r . > full-config.json
+  jsonfmt ./full-config.json -w
+  echo "Full config saved at $PWD/full-config.json"
+  exit 0
+fi
+
 [ "$update" == "1" ] && nix flake update
 
 # Make a tmp folder and build from there

lib/genflake.nix

@@ -1,6 +1,7 @@
 let
-  inherit (builtins) getEnv readFile;
-  inherit ((fromTOML (readFile ../config.toml))) icedos;
+  inherit (builtins) getEnv readFile toJSON;
+  config = (fromTOML (readFile ../config.toml));
+  inherit (config) icedos;
 
   system = icedos.system.arch or "x86_64-linux";
   pkgs = import <nixpkgs> { inherit system; };
@@ -10,10 +11,13 @@ let
     boolToString
     concatMapStrings
     concatStringsSep
+    evalModules
     fileContents
+    foldl'
     listToAttrs
     map
     pathExists
+    recursiveUpdate
     ;
 
   icedosLib = import ../lib {
@@ -60,9 +64,28 @@ let
   );
 
   nixosModulesText = modulesFromConfig.nixosModulesText;
+
+  evaluatedConfig =
+    toJSON
+      (evalModules {
+        modules = [
+          {
+            inherit config;
+
+            options =
+              let
+                mergedOptions =
+                  foldl' (acc: cur: recursiveUpdate acc cur.options)
+                    (import ../modules/options.nix { inherit icedosLib lib; }).options
+                    modulesFromConfig.options;
+              in
+              mergedOptions;
+          }
+        ];
+      }).config;
 in
 {
-  inherit flakeInputs;
+  inherit flakeInputs evaluatedConfig;
 
   flakeFinal = ''
     {

modules/options.nix

@@ -19,7 +19,7 @@ in
   options = {
     icedos = {
       system = {
-        arch = mkStrOption { };
+        arch = mkStrOption { default = "x86_64-linux"; };
 
         channels = mkSubmoduleListOption { default = [ ]; } {
           name = mkStrOption { };
@@ -34,8 +34,8 @@ in
 
       repositories = mkSubmoduleListOption { } {
         url = mkStrOption { };
-        fetchOptionalDependencies = mkBoolOption { };
-        modules = mkStrListOption { };
+        fetchOptionalDependencies = mkBoolOption { default = false; };
+        modules = mkStrListOption { default = [ ]; };
       };
     };
   };