nix.distributedBuilds: create directory for current load

default.nix

@@ -6,6 +6,7 @@ let
     check = true;
     modules =
       [ configuration
+        ./modules/alias.nix
         ./modules/system
         ./modules/system/activation-scripts.nix
         ./modules/system/defaults-write.nix

modules/alias.nix

@@ -0,0 +1,25 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+in
+
+{
+  options = {
+
+    nix.profile = mkOption { default = null; };
+
+  };
+
+  config = {
+
+    assertions =
+      [ { assertion = config.nix.profile == null; message = "nix.profile was renamed to nix.package"; }
+      ];
+
+    nix.package = mkIf (config.nix.profile != null) config.nix.profile;
+
+  };
+}

modules/nix/default.nix

@@ -47,12 +47,12 @@ in
 
     nix = {
 
-      profile = mkOption {
+      package = mkOption {
         type = types.path;
         default = "/nix/var/nix/profiles/default";
-        defaultText = "pkgs.nix";
+        example = "pkgs.nix";
         description = ''
-          This option specifies the profile that contains the Nix package instance to use throughout the system.
+          This option specifies the package or profile that contains the version of Nix to use throughout the system.
         '';
       };
 
@@ -337,7 +337,7 @@ in
       }
 
       // optionalAttrs cfg.distributedBuilds {
-        NIX_BUILD_HOOK = "${cfg.profile}/libexec/nix/build-remote.pl";
+        NIX_BUILD_HOOK = "${cfg.package}/libexec/nix/build-remote.pl";
         NIX_REMOTE_SYSTEMS = "/etc/nix/machines";
         NIX_CURRENT_LOAD = "/run/nix/current-load";
       };
@@ -347,5 +347,11 @@ in
       { NIX_PATH = concatStringsSep ":" cfg.nixPath;
       };
 
+    system.activationScripts.nix.text = mkIf cfg.distributedBuilds ''
+      if [ ! -d ${cfg.envVars.NIX_CURRENT_LOAD} ]; then
+        mkdir -p ${cfg.envVars.NIX_CURRENT_LOAD}
+      fi
+    '';
+
   };
 }

modules/services/activate-system.nix

@@ -19,6 +19,8 @@ let
 
     # Prevent the current configuration from being garbage-collected.
     ln -sfn /run/current-system /nix/var/nix/gcroots/current-system
+
+    ${config.system.activationScripts.nix.text}
   '';
 
 in

modules/services/nix-daemon.nix

@@ -38,7 +38,7 @@ in
     '';
 
     launchd.daemons.nix-daemon = {
-      serviceConfig.ProgramArguments = [ "/bin/sh" "-c" "exec ${config.nix.profile}/bin/nix-daemon" ];
+      serviceConfig.ProgramArguments = [ "/bin/sh" "-c" "exec ${config.nix.package}/bin/nix-daemon" ];
       serviceConfig.KeepAlive = true;
       serviceConfig.ProcessType = "Background";
       serviceConfig.LowPriorityIO = config.nix.daemonIONice;
@@ -47,7 +47,7 @@ in
 
       serviceConfig.EnvironmentVariables = config.nix.envVars
         # // { CURL_CA_BUNDLE = "/etc/ssl/certs/ca-certificates.crt"; }
-        // { SSL_CERT_FILE = "${config.nix.profile}/etc/ssl/certs/ca-bundle.crt"; }
+        // { SSL_CERT_FILE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"; }
         // { TMPDIR = "${cfg.tempDir}"; };
     };
   };

modules/system/activation-scripts.nix

@@ -59,6 +59,8 @@ in
       # Prevent the current configuration from being garbage-collected.
       ln -sfn /run/current-system /nix/var/nix/gcroots/current-system
 
+      ${cfg.activationScripts.nix.text}
+
       ${cfg.activationScripts.etc.text}
       ${cfg.activationScripts.launchd.text}
       ${cfg.activationScripts.time.text}