launchd: add options for setting launchd environment variables

Fixes #12

2 files changed, 37 insertions, 1 deletions

diff --git a/modules/launchd/default.nix b/modules/launchd/default.nix
index 078bfff..3a7bfea 100644
--- a/modules/launchd/default.nix
+++ b/modules/launchd/default.nix
@@ -86,6 +86,34 @@ in
 {
   options = {
 
+    launchd.envVariables = mkOption {
+      type = types.attrsOf (types.either types.str (types.listOf types.str));
+      default = {};
+      example = { LANG = "nl_NL.UTF-8"; };
+      description = ''
+        A set of environment variables to be set on all future
+        processes launched by launchd in the caller's context.
+        The value of each variable can be either a string or a list of
+        strings.  The latter is concatenated, interspersed with colon
+        characters.
+      '';
+      apply = mapAttrs (n: v: if isList v then concatStringsSep ":" v else v);
+    };
+
+    launchd.user.envVariables = mkOption {
+      type = types.attrsOf (types.either types.str (types.listOf types.str));
+      default = {};
+      example = { LANG = "nl_NL.UTF-8"; };
+      description = ''
+        A set of environment variables to be set on all future
+        processes launched by launchd in the caller's context.
+        The value of each variable can be either a string or a list of
+        strings.  The latter is concatenated, interspersed with colon
+        characters.
+      '';
+      apply = mapAttrs (n: v: if isList v then concatStringsSep ":" v else v);
+    };
+
     launchd.agents = mkOption {
       default = {};
       type = types.attrsOf (types.submodule serviceOptions);
diff --git a/modules/system/launchd.nix b/modules/system/launchd.nix
index b667efa..2960df8 100644
--- a/modules/system/launchd.nix
+++ b/modules/system/launchd.nix
@@ -11,6 +11,10 @@ let
     mkTextDerivation = pkgs.writeText;
   };
 
+  launchdVariables = mapAttrsToList (name: value: ''
+    launchctl setenv ${name} '${value}'
+  '');
+
   launchdActivation = basedir: target: ''
     if ! diff '${cfg.build.launchd}/Library/${basedir}/${target}' '/Library/${basedir}/${target}' &> /dev/null; then
       if test -f '/Library/${basedir}/${target}'; then
@@ -86,7 +90,9 @@ in
 
     system.activationScripts.launchd.text = ''
       # Set up launchd services in /Library/LaunchAgents and /Library/LaunchDaemons
-      echo "setting up launchd services..."
+      echo "setting up launchd services..." >&2
+
+      ${concatStringsSep "\n" (launchdVariables config.launchd.envVariables)}
 
       ${concatMapStringsSep "\n" (attr: launchdActivation "LaunchAgents" attr.target) launchAgents}
       ${concatMapStringsSep "\n" (attr: launchdActivation "LaunchDaemons" attr.target) launchDaemons}
@@ -112,6 +118,8 @@ in
       # Set up user launchd services in ~/Library/LaunchAgents
       echo "setting up user launchd services..."
 
+      ${concatStringsSep "\n" (launchdVariables config.launchd.user.envVariables)}
+
       ${concatMapStringsSep "\n" (attr: userLaunchdActivation attr.target) userLaunchAgents}
 
       for f in $(ls /run/current-system/user/Library/LaunchAgents); do