fix: preserve Windows Node shim detection

* updating readme to include devEngines.packageManager.version in selecting version

* docs: check out the manifest before inferring pnpm version

---------

Co-authored-by: Zoltan Kochan <z@kochan.io>

.github/workflows/pr-check.yaml

@@ -13,14 +13,21 @@ jobs:
   check-dist:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Setup pnpm
-        uses: pnpm/action-setup@fc06bc1257f339d1d5d8b3a19a8cae5388b55320 # v5.0.0
+        uses: pnpm/action-setup@ea17c68df8912ef543352723c149a84f56e3d413 # v6.1.0
         with:
           run_install: true
           version: 11
 
+      - uses: actions/setup-node@249970729cb0ef3589644e2896645e5dc5ba9c38 # v6
+        with:
+          node-version: 24
+
+      - name: Test
+        run: pnpm test
+
       - name: Update dist/index.js
         run: pnpm run build
 

.github/workflows/test.yaml

@@ -7,6 +7,9 @@ on:
       - master
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   smoke:
     # Cross-OS coverage. Exercises the bootstrap install + PATH on each platform,
@@ -51,7 +54,7 @@ jobs:
             version: '12.3.4'
 
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - id: pnpm
         name: Run the action
@@ -134,7 +137,7 @@ jobs:
             expect_pm_on_fail_unset: true
 
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Set up package.json
         run: echo '${{ matrix.manifest }}' > package.json
@@ -183,7 +186,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
 
@@ -234,7 +237,7 @@ jobs:
     env:
       REQUIRED: ${{ matrix.version }}
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
 
@@ -298,7 +301,7 @@ jobs:
     name: 'Standalone Windows self-update (PATH regression)'
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Set up package.json with a minimal manifest
         # run_install needs a manifest to install against. Removing the
@@ -356,7 +359,7 @@ jobs:
             manifest: '{"devEngines":{"packageManager":{"name":"pnpm","version":">=10 <11"}},"dependencies":{"is-odd":"3.0.1"}}'
 
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Set up package.json
         run: echo '${{ matrix.manifest }}' > package.json
@@ -400,7 +403,7 @@ jobs:
                 - yarn
 
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Run the action
         uses: ./
@@ -419,3 +422,45 @@ jobs:
             exit 1
           fi
         shell: bash
+
+  windows_dest_spaces:
+    name: 'Windows destination with spaces (${{ matrix.version }} / standalone=${{ matrix.standalone }})'
+    runs-on: windows-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - version: '10.33.0'
+            standalone: false
+          - version: '11.25.0'
+            standalone: true
+          - version: '12.3.4'
+            standalone: false
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - id: pnpm
+        uses: ./
+        with:
+          version: ${{ matrix.version }}
+          standalone: ${{ matrix.standalone }}
+          dest: '${{ runner.temp }}/pnpm setup & tools'
+      - name: Verify PowerShell and bin_dest use the requested version
+        shell: pwsh
+        env:
+          EXPECTED_VERSION: ${{ matrix.version }}
+          BIN_DEST: ${{ steps.pnpm.outputs.bin_dest }}
+        run: |
+          $actual = pnpm --version
+          if ($LASTEXITCODE -ne 0 -or $actual -ne $env:EXPECTED_VERSION) {
+            throw "Expected $env:EXPECTED_VERSION on PATH, got $actual"
+          }
+          $command = Get-Command pnpm
+          $executable = Join-Path $env:BIN_DEST $command.Name
+          $actual = & $executable --version
+          if ($LASTEXITCODE -ne 0 -or $actual -ne $env:EXPECTED_VERSION) {
+            throw "Expected $env:EXPECTED_VERSION via bin_dest, got $actual"
+          }
+          $pnpx = Get-Command pnpx -ErrorAction Stop
+          if ((Split-Path -Parent $pnpx.Source) -ne $env:BIN_DEST) {
+            throw "pnpx resolves to $($pnpx.Source), expected under $env:BIN_DEST"
+          }

README.md

@@ -64,7 +64,7 @@ Input and output changes:
 
 Version of pnpm to install.
 
-**Optional** when there is a [`packageManager` or `devEngines.packageManager` field in the `package.json`](https://nodejs.org/api/corepack.html).
+**Optional** when `package.json` declares pnpm in `packageManager`, or sets `devEngines.packageManager.name` to `"pnpm"` and provides `devEngines.packageManager.version`.
 
 otherwise, this field is **required** It supports npm versioning scheme, it could be an exact version (such as `10.9.8`), or a version range (such as `10`, `10.x.x`, `10.9.x`, `^10.9.8`, `*`, etc.), or `latest`.
 
@@ -157,6 +157,8 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+      - uses: actions/checkout@v6
+
       - uses: pnpm/action-setup@v6
 ```
 

package.json

@@ -4,7 +4,8 @@
     "build:bundle": "esbuild src/index.ts --bundle --platform=node --target=node24 --format=cjs --minify --outfile=dist/index.js --loader:.json=json",
     "build": "pnpm run build:bundle",
     "start": "pnpm run build && sh ./run.sh",
-    "update-bootstrap": "node scripts/update-bootstrap.mjs"
+    "update-bootstrap": "node scripts/update-bootstrap.mjs",
+    "test": "node --experimental-test-module-mocks --test test/*.test.mjs"
   },
   "dependencies": {
     "@actions/cache": "^4.1.0",

src/cache-save/run.ts

@@ -1,5 +1,6 @@
 import { saveCache } from '@actions/cache'
 import { getState, info } from '@actions/core'
+import { access } from 'fs/promises'
 
 export async function runSaveCache() {
   const state = getState('cache_restored_key')
@@ -11,6 +12,17 @@ export async function runSaveCache() {
     return
   }
 
+  try {
+    await access(cachePath)
+  } catch (error) {
+    if (!(error instanceof Error)) throw error
+    if (!('code' in error)) throw error
+    if (error.code !== 'ENOENT') throw error
+
+    info(`Cache path ${cachePath} does not exist, not saving cache.`)
+    return
+  }
+
   const cacheId = await saveCache([cachePath], primaryKey)
   if (cacheId == -1) return
 

src/install-pnpm/run.ts

@@ -1,4 +1,5 @@
 import { addPath, exportVariable } from '@actions/core'
+import { exec } from '@actions/exec'
 import { spawn } from 'child_process'
 import { rm, writeFile, mkdir, symlink } from 'fs/promises'
 import { readFileSync, existsSync } from 'fs'
@@ -221,15 +222,10 @@ function getSystemNodeVersion(): Promise<{ major: number; minor: number }> {
 }
 
 function runCommand(cmd: string, args: string[], opts: { cwd: string; env?: Record<string, string | undefined> }): Promise<number> {
-  return new Promise<number>((resolve, reject) => {
-    const cp = spawn(cmd, args, {
+  return exec(`"${cmd}"`, args, {
     cwd: opts.cwd,
-      env: opts.env,
-      stdio: ['pipe', 'inherit', 'inherit'],
-      shell: process.platform === 'win32',
-    })
-    cp.on('error', reject)
-    cp.on('close', resolve)
+    env: opts.env && Object.fromEntries(Object.entries(opts.env).filter((entry): entry is [string, string] => entry[1] !== undefined)),
+    ignoreReturnCode: true,
   })
 }
 

test/cache-save.test.mjs

@@ -0,0 +1,47 @@
+import assert from 'node:assert/strict'
+import { mkdtemp, rm, access } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { after, beforeEach, mock, test } from 'node:test'
+
+const directory = await mkdtemp(join(tmpdir(), 'pnpm-cache-save-'))
+after(() => rm(directory, { recursive: true, force: true }))
+let state
+let checkAccess
+const saveCache = mock.fn(async () => 1)
+mock.module('@actions/cache', { namedExports: { saveCache } })
+mock.module('@actions/core', {
+  namedExports: { getState: name => state[name], info: () => {} },
+})
+mock.module('fs/promises', { namedExports: { access: path => checkAccess(path) } })
+const { runSaveCache } = await import('../src/cache-save/run.ts')
+
+beforeEach(() => {
+  state = { cache_restored_key: 'old', cache_primary_key: 'new', cache_path: directory }
+  checkAccess = access
+  saveCache.mock.resetCalls()
+})
+
+test('skips saving a missing directory', async () => {
+  state.cache_path = join(directory, 'missing')
+  await runSaveCache()
+  assert.equal(saveCache.mock.callCount(), 0)
+})
+
+test('saves an existing directory with the primary key', async () => {
+  await runSaveCache()
+  assert.deepEqual(saveCache.mock.calls[0].arguments, [[directory], 'new'])
+})
+
+test('skips saving a primary-key cache hit', async () => {
+  state.cache_restored_key = 'new'
+  await runSaveCache()
+  assert.equal(saveCache.mock.callCount(), 0)
+})
+
+test('propagates unexpected filesystem errors', async () => {
+  const error = Object.assign(new Error('access denied'), { code: 'EACCES' })
+  checkAccess = async () => { throw error }
+  await assert.rejects(runSaveCache(), error)
+  assert.equal(saveCache.mock.callCount(), 0)
+})