fetchPnpmDeps: don't fail on empty lockfile

pkgs/build-support/node/fetch-pnpm-deps/default.nix

@@ -162,9 +162,9 @@ in
               # See https://github.com/NixOS/nixpkgs/pull/350063
               # See https://github.com/NixOS/nixpkgs/issues/422889
               if [[ ${toString fetcherVersion} -ge 2 ]]; then
-                find $storePath -type f -name "*-exec" -print0 | xargs -0 chmod 555
-                find $storePath -type f -not -name "*-exec" -print0 | xargs -0 chmod 444
-                find $storePath -type d -print0 | xargs -0 chmod 555
+                find $storePath -type f -name "*-exec" -print0 | xargs --no-run-if-empty -0 chmod 555
+                find $storePath -type f -not -name "*-exec" -print0 | xargs --no-run-if-empty -0 chmod 444
+                find $storePath -type d -print0 | xargs --no-run-if-empty -0 chmod 555
               fi
 
               if [[ ${toString fetcherVersion} -ge 3 ]]; then

pkgs/test/default.nix

@@ -170,6 +170,8 @@ in
 
   php = recurseIntoAttrs (callPackages ./php { });
 
+  pnpm = recurseIntoAttrs (callPackages ./pnpm { });
+
   go = recurseIntoAttrs (callPackage ../build-support/go/tests.nix { });
 
   lake = callPackage ../build-support/lake/test { };

pkgs/test/pnpm/default.nix

@@ -0,0 +1,4 @@
+{ callPackage }:
+{
+  pnpm-empty-lockfile = callPackage ./pnpm-empty-lockfile { };
+}

pkgs/test/pnpm/pnpm-empty-lockfile/default.nix

@@ -0,0 +1,32 @@
+{
+  pkgs,
+  stdenv,
+  fetchPnpmDeps,
+  nodejs,
+  pnpm_10,
+  pnpmConfigHook,
+}:
+stdenv.mkDerivation {
+  name = "pnpm-empty-lockfile";
+
+  src = ./.;
+
+  nativeBuildInputs = [
+    pnpm_10
+    pnpmConfigHook
+  ];
+
+  pnpmDeps = fetchPnpmDeps {
+    pname = "pnpm-empty-lockfile";
+    fetcherVersion = 3;
+    pnpm = pnpm_10;
+    src = ./.;
+    hash = "sha256-u0GOAX5B1f2ANWbOezScp/eKQRRZA/JoYfQ5zLrNip4=";
+  };
+
+  buildPhase = ''
+    runHook preBuild
+    touch $out
+    runHook postBuild
+  '';
+}

pkgs/test/pnpm/pnpm-empty-lockfile/package.json

@@ -0,0 +1,6 @@
+{
+    "name": "pnpm-empty-lockfile",
+    "main": "main.mjs",
+    "dependencies": {
+    }
+}