add config environment.etc which gets converted to pseudofiles

make-image.nix

@@ -5,6 +5,7 @@
 , callPackage
 , execline
 , lib
+, pseudofile
 , runCommand
 , s6-init-bin
 , s6-init-files
@@ -20,11 +21,6 @@ let
     services = builtins.attrValues config.services;
   };
 
-  profile  = writeScript ".profile" ''
-    PATH=${lib.makeBinPath ([ s6-init-bin busybox execline s6-linux-init s6-rc])}
-    export PATH
-  '';
-
   pseudofiles = writeText "pseudofiles" ''
      / d 0755 0 0
      /bin d 0755 0 0
@@ -49,12 +45,19 @@ let
      /etc/s6-rc d 0755 0 0
      /etc/s6-rc/compiled s 0755 0 0 ${s6-rc-db}/compiled
      /etc/passwd f 0644 0 0 echo  "root::0:0:root:/:/bin/sh"
-     /.profile s 0644 0 0 ${profile}
   '';
+
+  config-pseudofiles = pseudofile.write "config.etc"
+    (config.environment.contents);
+
   storefs = callPackage <nixpkgs/nixos/lib/make-squashfs.nix> {
     # add pseudofiles to store so that the packages they
     # depend on are also added
-    storeContents = [ pseudofiles s6-init-files ] ++ config.packages ;
+    storeContents = [
+      pseudofiles
+      s6-init-files
+      config-pseudofiles
+    ] ++ config.packages ;
   };
 in runCommand "frob-squashfs" {
     nativeBuildInputs = with buildPackages; [ squashfsTools qprint ];
@@ -62,6 +65,6 @@ in runCommand "frob-squashfs" {
     cp ${storefs} ./store.img
     chmod +w store.img
     mksquashfs - store.img -no-recovery -quiet -no-progress  -root-becomes store -p "/ d 0755 0 0"
-    mksquashfs - store.img -no-recovery -quiet -no-progress  -root-becomes nix  -pf ${pseudofiles} -pf ${s6-init-files}
+    mksquashfs - store.img -no-recovery -quiet -no-progress  -root-becomes nix  -pf ${pseudofiles} -pf ${s6-init-files} -pf ${config-pseudofiles}
     cp store.img $out
   ''

modules/base.nix

@@ -17,6 +17,7 @@ in {
     services = mkOption {
       type = types.attrsOf type_service;
     };
+    environment = mkOption { type = types.anything; };
     kernel = {
       config = mkOption {
         # mostly the values are y n or m, but sometimes
@@ -28,4 +29,16 @@ in {
       };
     };
   };
+  config = {
+    environment = dir {
+      etc = dir {
+        profile = symlink
+          (pkgs.writeScript ".profile" ''
+            PATH=${lib.makeBinPath (with pkgs; [ s6-init-bin busybox execline s6-linux-init s6-rc])}
+            export PATH
+          '');
+
+      };
+    };
+  };
 }