Add linux environment variable for packell to nix env

.circleci/config.yml

@@ -204,11 +204,11 @@ jobs:
       - run:
           name: Validate package versions
           command:
-            nix-shell --pure --run 'export LANG=C.UTF-8; packell versioning validate'
+            make ci-versioning
       - run:
           name: Validate package data-dependencies
           command:
-            nix-shell --pure --run 'export LANG=C.UTF-8; packell data-dependencies validate'
+            make ci-data-dependencies
       - run_daml_build
       - run:
           name: Validate packages

Makefile

@@ -127,13 +127,13 @@ ci-assembly:
 ci-versioning:
 	@nix-shell \
 		--pure \
-		--run 'export LANG=C.UTF-8; packell versioning validate'
+		--run 'packell versioning validate'
 
 .PHONY: ci-data-dependencies
 ci-data-dependencies:
 	@nix-shell \
 		--pure \
-		--run 'export LANG=C.UTF-8; packell data-dependencies validate'
+		--run 'packell data-dependencies validate'
 
 .PHONY: ci-local
 ci-local: clean-all ci-headers-check ci-versioning ci-data-dependencies ci-build ci-validate ci-build-java ci-build-js ci-test ci-docs

nix/packell.nix

@@ -26,10 +26,17 @@ in
     version = "$version";
     src = tarball;
     nativeBuildInputs = if stdenv.isLinux then [ pkgs.autoPatchelfHook ] else [ ];
-    buildInputs = if stdenv.isLinux then [  pkgs.gmp pkgs.libffi ] else [ ];
+    buildInputs = if stdenv.isLinux then [ pkgs.gmp pkgs.libffi ] else [ ];
     baseInputs = [ pkgs.binutils ];
     installPhase = ''
       mkdir -p $out/bin
       cp packell $out/bin
     '';
+    preFixup = if stdenv.isLinux
+      then ''
+        # Set LANG for linux environments.
+        mkdir -p $out/nix-support
+        echo export LANG=C.UTF-8 > $out/nix-support/setup-hook
+      ''
+      else "";
   }