From 37955437a78e6effe93022d70a131ff88e92a08e Mon Sep 17 00:00:00 2001
From: Sam Pointon <sampointon@gmail.com>
Date: Sun, 26 Apr 2026 17:18:59 +0100
Subject: [PATCH] fetchPnpmDeps: don't fail on empty lockfile

If the lockfile is empty, no files will be put in the output directory.
In this case, the find invocations produce an empty list of results.
xargs' default behaviour is to always invoke its command at least once;
if its input is empty, then its command will not be passed any
filenames. This produces an invocation like `chmod 555`. chmod, however,
fails in this case, expecting an operand. So we need to tell xargs not
to invoke its command at all in the case of empty input.
---
 .../node/fetch-pnpm-deps/default.nix          |  6 ++--
 pkgs/test/default.nix                         |  2 ++
 pkgs/test/pnpm/default.nix                    |  4 +++
 .../test/pnpm/pnpm-empty-lockfile/default.nix | 32 +++++++++++++++++++
 pkgs/test/pnpm/pnpm-empty-lockfile/main.mjs   |  0
 .../pnpm/pnpm-empty-lockfile/package.json     |  6 ++++
 .../pnpm/pnpm-empty-lockfile/pnpm-lock.yaml   |  9 ++++++
 7 files changed, 56 insertions(+), 3 deletions(-)
 create mode 100644 pkgs/test/pnpm/default.nix
 create mode 100644 pkgs/test/pnpm/pnpm-empty-lockfile/default.nix
 create mode 100644 pkgs/test/pnpm/pnpm-empty-lockfile/main.mjs
 create mode 100644 pkgs/test/pnpm/pnpm-empty-lockfile/package.json
 create mode 100644 pkgs/test/pnpm/pnpm-empty-lockfile/pnpm-lock.yaml

diff --git a/pkgs/build-support/node/fetch-pnpm-deps/default.nix b/pkgs/build-support/node/fetch-pnpm-deps/default.nix
index 582ea27150114..6b33c263b895b 100644
--- a/pkgs/build-support/node/fetch-pnpm-deps/default.nix
+++ b/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
diff --git a/pkgs/test/default.nix b/pkgs/test/default.nix
index 9270784835803..63e8e2b32aaef 100644
--- a/pkgs/test/default.nix
+++ b/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 { };
diff --git a/pkgs/test/pnpm/default.nix b/pkgs/test/pnpm/default.nix
new file mode 100644
index 0000000000000..1e7d882ce295e
--- /dev/null
+++ b/pkgs/test/pnpm/default.nix
@@ -0,0 +1,4 @@
+{ callPackage }:
+{
+  pnpm-empty-lockfile = callPackage ./pnpm-empty-lockfile { };
+}
diff --git a/pkgs/test/pnpm/pnpm-empty-lockfile/default.nix b/pkgs/test/pnpm/pnpm-empty-lockfile/default.nix
new file mode 100644
index 0000000000000..bb40b0aa749a0
--- /dev/null
+++ b/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
+  '';
+}
diff --git a/pkgs/test/pnpm/pnpm-empty-lockfile/main.mjs b/pkgs/test/pnpm/pnpm-empty-lockfile/main.mjs
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git a/pkgs/test/pnpm/pnpm-empty-lockfile/package.json b/pkgs/test/pnpm/pnpm-empty-lockfile/package.json
new file mode 100644
index 0000000000000..5fde86ab7086a
--- /dev/null
+++ b/pkgs/test/pnpm/pnpm-empty-lockfile/package.json
@@ -0,0 +1,6 @@
+{
+    "name": "pnpm-empty-lockfile",
+    "main": "main.mjs",
+    "dependencies": {
+    }
+}
diff --git a/pkgs/test/pnpm/pnpm-empty-lockfile/pnpm-lock.yaml b/pkgs/test/pnpm/pnpm-empty-lockfile/pnpm-lock.yaml
new file mode 100644
index 0000000000000..9b60ae1782d6d
--- /dev/null
+++ b/pkgs/test/pnpm/pnpm-empty-lockfile/pnpm-lock.yaml
@@ -0,0 +1,9 @@
+lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+importers:
+
+  .: {}