From b3d5e5072b958f80aea73f50c8595f574764c8a5 Mon Sep 17 00:00:00 2001
From: Assil Ksiksi <cyph0nik@gmail.com>
Date: Tue, 7 Nov 2023 20:58:44 -0500
Subject: [PATCH] import attrset via runCommand

---
 flake.nix                               | 43 ++++++++++++++-----------
 templates/main.nix.tmpl                 |  2 --
 testdata/TestDocker_WithProject_out.nix |  2 --
 testdata/TestDocker_out.nix             |  2 --
 testdata/TestPodman_WithProject_out.nix |  2 --
 testdata/TestPodman_out.nix             |  2 --
 6 files changed, 25 insertions(+), 28 deletions(-)

diff --git a/flake.nix b/flake.nix
index e33bd58..4c7fb4b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -44,7 +44,6 @@
           # https://nixos.org/manual/nixos/stable/#sec-option-declarations
           paths = mkOption {
             type = types.listOf types.path;
-            default = [];
             description = lib.mdDoc "One or more paths to Docker Compose files.";
           };
           runtime = mkOption {
@@ -88,27 +87,35 @@
             description = lib.mdDoc "Auto-start all containers.";
           };
         };
-        config.compose2nix = mkIf (cfg.paths != []) {
-          # runCommandLocal ensures that we always build this derivation on the local machine.
-          # This allows us to circumvent the Nix binary cache and minimize the time spent outside
-          # of building the derivation.
-          # https://nixos.org/manual/nixpkgs/stable/#trivial-builder-runCommandLocal
-          output = pkgs.runCommandLocal "run-compose2nix" {
-            env = cfg.env;
+        # runCommandLocal ensures that we always build this derivation on the local machine.
+        # This allows us to circumvent the Nix binary cache and minimize the time spent outside
+        # of building the derivation.
+        # https://nixos.org/manual/nixpkgs/stable/#trivial-builder-runCommandLocal
+        config = let
+          env = cfg.env;
+          paths = cfg.paths;
+          runtime = cfg.runtime;
+          project = cfg.project;
+          projectSeparator = cfg.projectSeparator;
+          envFilesOnly = cfg.envFilesOnly;
+          serviceInclude = cfg.serviceInclude;
+          autoStart = cfg.autoStart;
+          in
+          import (pkgs.runCommandLocal "compose2nix" {
+            env = env;
             buildInputs = [ pkgs.compose2nix ];
           } ''
             ${pkgs.compose2nix}/bin/compose2nix \
-              -paths='${concatStringsSep "," cfg.paths}' \
-              -runtime=${cfg.runtime} \
-              -project=${cfg.project} \
-              -project_separator='${cfg.projectSeparator}' \
-              -env_files='${concatStringsSep "," cfg.envFiles}' \
-              -env_files_only=${cfg.envFilesOnly} \
-              -service_include='${cfg.serviceInclude}' \
-              -auto_start=${cfg.autoStart} \
+              -paths='${concatStringsSep "," paths}' \
+              -runtime=${runtime} \
+              -project=${project} \
+              -project_separator='${projectSeparator}' \
+              -env_files='${concatStringsSep "," envFiles}' \
+              -env_files_only=${envFilesOnly} \
+              -service_include='${serviceInclude}' \
+              -auto_start=${autoStart} \
               -output=$out
-          '';
-        };
+        '');
       };
     });
   };
diff --git a/templates/main.nix.tmpl b/templates/main.nix.tmpl
index 7499347..0a2e25a 100644
--- a/templates/main.nix.tmpl
+++ b/templates/main.nix.tmpl
@@ -1,6 +1,4 @@
 {{- $runtime := .Runtime | printf "%s" -}}
-{ pkgs, ... }:
-
 {
   # Runtime
   virtualisation.{{$runtime}} = {
diff --git a/testdata/TestDocker_WithProject_out.nix b/testdata/TestDocker_WithProject_out.nix
index b0b8c2c..a669fa2 100644
--- a/testdata/TestDocker_WithProject_out.nix
+++ b/testdata/TestDocker_WithProject_out.nix
@@ -1,5 +1,3 @@
-{ pkgs, ... }:
-
 {
   # Runtime
   virtualisation.docker = {
diff --git a/testdata/TestDocker_out.nix b/testdata/TestDocker_out.nix
index fcb1383..0cb299f 100644
--- a/testdata/TestDocker_out.nix
+++ b/testdata/TestDocker_out.nix
@@ -1,5 +1,3 @@
-{ pkgs, ... }:
-
 {
   # Runtime
   virtualisation.docker = {
diff --git a/testdata/TestPodman_WithProject_out.nix b/testdata/TestPodman_WithProject_out.nix
index 4fc7dab..45726bb 100644
--- a/testdata/TestPodman_WithProject_out.nix
+++ b/testdata/TestPodman_WithProject_out.nix
@@ -1,5 +1,3 @@
-{ pkgs, ... }:
-
 {
   # Runtime
   virtualisation.podman = {
diff --git a/testdata/TestPodman_out.nix b/testdata/TestPodman_out.nix
index da69ab9..ccfdb3d 100644
--- a/testdata/TestPodman_out.nix
+++ b/testdata/TestPodman_out.nix
@@ -1,5 +1,3 @@
-{ pkgs, ... }:
-
 {
   # Runtime
   virtualisation.podman = {