fix: Avoid the need for impure for devenv (#4245)

Based on https://github.com/cachix/devenv/pull/1018/files
teslamate-org · Oct 6, 2024 · a4f4751 · a4f4751
1 parent dc64687
commit a4f4751
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Showing 3 changed files with 26 additions and 2 deletions.
diff --git a/.envrc b/.envrc
@@ -1 +1 @@
-use flake . --impure
+use flake . --override-input devenv-root "file+file://"<(printf %s "$PWD")
diff --git a/flake.lock b/flake.lock
diff --git a/flake.nix b/flake.nix
@@ -5,9 +5,13 @@
     nixpkgs = { url = "github:NixOS/nixpkgs/nixos-unstable"; };
     flake-utils = { url = "github:numtide/flake-utils"; };
     devenv.url = "github:cachix/devenv";
+    devenv-root = {
+      url = "file+file:///dev/null";
+      flake = false;
+    };
   };
 
-  outputs = inputs@{ self, nixpkgs, flake-utils, devenv }:
+  outputs = inputs@{ self, nixpkgs, flake-utils, devenv, devenv-root }:
     (flake-utils.lib.eachDefaultSystem (system:
       let
         inherit (pkgs.lib) optional optionals;
@@ -98,6 +102,13 @@
         devShell = devenv.lib.mkShell {
           inherit inputs pkgs;
           modules = with pkgs; [{
+
+            devenv.root =
+              let
+                devenvRootFileContent = builtins.readFile devenv-root.outPath;
+              in
+              pkgs.lib.mkIf (devenvRootFileContent != "") devenvRootFileContent;
+
             packages = [
               elixir
               elixir_ls