From 26bcbd3f86c9ef799c67b09b8273ec3bdf2fd766 Mon Sep 17 00:00:00 2001
From: Ben Wolsieffer <benwolsieffer@gmail.com>
Date: Mon, 14 Sep 2020 14:46:37 -0400
Subject: [PATCH] nixos: allow passing params to nodes

---
 modules/nodes.nix | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/modules/nodes.nix b/modules/nodes.nix
index ac4d30d0fa..c327253a24 100644
--- a/modules/nodes.nix
+++ b/modules/nodes.nix
@@ -84,6 +84,14 @@ in {
               Arguments to pass to the node.
             '';
           };
+
+          params = mkOption {
+            type = types.attrsOf types.str;
+            default = {};
+            description = ''
+              Key-value parameters to pass to the node.
+            '';
+          };
         };
 
         config = mkMerge [
@@ -141,9 +149,11 @@ in {
 
   config = mkIf cfg.enable {
     systemd.services = mkMerge [
-      (serviceGenerator (config:
-        escapeShellArgs ([ "${config.env}/bin/rosrun" config.package config.node ] ++ config.args)
-      ) cfg.nodes)
+      (serviceGenerator (config: escapeShellArgs (
+        [ "${config.env}/bin/rosrun" config.package config.node ] ++
+        (mapAttrsToList (n: v: "${n}:=${v}") config.params) ++
+        config.args
+      )) cfg.nodes)
       (serviceGenerator (config: escapeShellArgs (
         [ "${config.env}/bin/roslaunch" "--wait" ] ++ 
         config.roslaunchArgs ++