platformio: make multi-output

Currently udev rules symlinks against platformio sources, pulling in the platformio source tree into the runtime closure.
Previous to platformio-core being exposed separately from platformio this also meant that you had no ergonomic way to avoid platformio in the system closure, even though you only wanted the udev rules.

We can avoid this by making platformio-core multi output, making it trivial to depend only on the udev rules.

4 files changed, 13 insertions, 8 deletions

diff --git a/pkgs/development/embedded/platformio/chrootenv.nix b/pkgs/development/embedded/platformio/chrootenv.nix
index 9e84a8d6ba45..3f4a7e7385dc 100644
--- a/pkgs/development/embedded/platformio/chrootenv.nix
+++ b/pkgs/development/embedded/platformio/chrootenv.nix
@@ -1,4 +1,4 @@
-{ lib, buildFHSUserEnv, version, src }:
+{ lib, buildFHSUserEnv, platformio-core }:
 
 let
   pio-pkgs = pkgs:
@@ -34,10 +34,8 @@ buildFHSUserEnv {
   };
 
   extraInstallCommands = ''
-    mkdir -p $out/lib/udev/rules.d
-
     ln -s $out/bin/platformio $out/bin/pio
-    ln -s ${src}/platformio/assets/system/99-platformio-udev.rules $out/lib/udev/rules.d/99-platformio-udev.rules
+    ln -s ${platformio-core.udev}/lib $out/lib
   '';
 
   runScript = "platformio";
diff --git a/pkgs/development/embedded/platformio/core.nix b/pkgs/development/embedded/platformio/core.nix
index 00ee07a5fc5b..c0127fae5acb 100644
--- a/pkgs/development/embedded/platformio/core.nix
+++ b/pkgs/development/embedded/platformio/core.nix
@@ -10,6 +10,8 @@ with python3.pkgs; buildPythonApplication rec {
   pname = "platformio";
   inherit version src;
 
+  outputs = [ "out" "udev" ];
+
   patches = [
     ./fix-searchpath.patch
     ./use-local-spdx-license-list.patch
@@ -60,6 +62,13 @@ with python3.pkgs; buildPythonApplication rec {
     pytestCheckHook
   ];
 
+  # Install udev rules into a separate output so all of platformio-core is not a dependency if
+  # you want to use the udev rules on NixOS but not install platformio in your system packages.
+  postInstall = ''
+    mkdir -p $udev/lib/udev/rules.d/99-platformio-udev.rules
+    cp platformio/assets/system/99-platformio-udev.rules $udev/lib/udev/rules.d/99-platformio-udev.rules
+  '';
+
   disabledTestPaths = [
     "tests/commands/pkg/test_install.py"
     "tests/commands/pkg/test_list.py"
diff --git a/pkgs/development/embedded/platformio/default.nix b/pkgs/development/embedded/platformio/default.nix
index fbcce7eae60e..70a11f5736f3 100644
--- a/pkgs/development/embedded/platformio/default.nix
+++ b/pkgs/development/embedded/platformio/default.nix
@@ -16,7 +16,7 @@ let
   self = {
     platformio-core = python3Packages.callPackage ./core.nix { inherit version src; };
 
-    platformio-chrootenv = callPackage ./chrootenv.nix { inherit version src; };
+    platformio-chrootenv = callPackage ./chrootenv.nix { };
   };
 
 in
diff --git a/pkgs/development/embedded/platformio/missing-udev-rules-nixos.patch b/pkgs/development/embedded/platformio/missing-udev-rules-nixos.patch
index 2a978496a19b..4be06ceac8b1 100644
--- a/pkgs/development/embedded/platformio/missing-udev-rules-nixos.patch
+++ b/pkgs/development/embedded/platformio/missing-udev-rules-nixos.patch
@@ -6,7 +6,5 @@ index ef1d3bab..445174fc 100644
      MESSAGE = (
          "Warning! Please install `99-platformio-udev.rules`. \nMore details: "
          "https://docs.platformio.org/en/latest/core/installation/udev-rules.html"
-+        "On NixOS add the platformio package to services.udev.packages"
++        "On NixOS add the platformio-core.udev package to services.udev.packages"
      )
- 
-