okay-okay, frontend

.github/workflows/ci.yml

@@ -13,13 +13,52 @@ jobs:
   setup-bazel:
     runs-on: ${{ matrix.os }}-latest
     strategy:
+      fail-fast: false
       matrix:
         os:
           - macos
           - ubuntu
           - windows
     steps:
-      - uses: actions/checkout@v6
-      - uses: ./
-      - if: failure() && runner.debug == '1'
+      - name: Checkout example
+        uses: actions/checkout@v4
+        with:
+          repository: bazelbuild/examples
+          sparse-checkout: frontend
+          sparse-checkout-cone-mode: false
+
+      - name: Checkout setup-bazel
+        uses: actions/checkout@v4
+        with:
+          path: setup-bazel
+
+      - name: Prepare environment (POSIX)
+        if: matrix.os != 'windows'
+        run: |
+          rm $(which bazel)
+          shopt -s dotglob
+          mv frontend/* .
+          rmdir frontend
+
+      - name: Prepare environment (Windows)
+        if: matrix.os == 'windows'
+        run: |
+          Remove-Item -Path (Get-Command bazel.exe).Source
+          Get-ChildItem -Path frontend -Recurse -File | Move-Item -Destination .
+          Remove-Item -Path frontend -Recurse -Force
+
+      - name: Setup Bazel
+        uses: ./setup-bazel/
+        with:
+          bazelisk-cache: true
+          bazelisk-version: 1.x
+          bazelrc: test --test_output=errors
+          remote-cache: true
+          repository-cache: true
+
+      - run: bazel build ...
+      - run: bazel test ...
+
+      - name: Start SSH session
+        if: failure() && runner.debug == '1'
         uses: mxschmitt/action-tmate@v3

.github/workflows/release.yml

@@ -15,8 +15,8 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-node@v6
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
         with:
           cache: npm
           node-version-file: package.json

.tool-versions

@@ -1 +1 @@
-nodejs 24.14.0
+nodejs 20.14.0

README.md

@@ -6,7 +6,7 @@ and provides an advanced fine-grained caching to improve workflows performance.
 ## Usage
 
 ```yaml
-- uses: bazel-contrib/setup-bazel@0.18.0
+- uses: bazel-contrib/setup-bazel@0.8.4
   with:
     # Avoid downloading Bazel every time.
     bazelisk-cache: true
@@ -39,7 +39,7 @@ Default `""`.
   #### Install Bazelisk 1.x
 
   ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
+  - uses: bazel-contrib/setup-bazel@0.8.4
     with:
       bazelisk-version: 1.x
   ```
@@ -47,7 +47,7 @@ Default `""`.
   #### Install exact Bazelisk version
 
   ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
+  - uses: bazel-contrib/setup-bazel@0.8.4
     with:
       bazelisk-version: 1.19.0
   ```
@@ -67,7 +67,7 @@ Default `""`.
   #### Enable Bzlmod
 
   ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
+  - uses: bazel-contrib/setup-bazel@0.8.4
     with:
       bazelrc: common --enable_bzlmod
   ```
@@ -75,7 +75,7 @@ Default `""`.
   #### Add colors and timestamps
 
   ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
+  - uses: bazel-contrib/setup-bazel@0.8.4
     with:
       bazelrc: |
         build --color=yes
@@ -83,30 +83,6 @@ Default `""`.
   ```
 </details>
 
-### `cache-save`
-
-Whether to save caches at the end of the workflow.
-
-Set to `false` for pull requests to allow cache restoration without saving,
-which prevents PRs from polluting the cache while still benefiting from it.
-
-Default `true`.
-
-<details>
-  <summary>Examples</summary>
-
-  #### Disable cache saving on pull requests
-
-  ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
-    with:
-      bazelisk-cache: true
-      disk-cache: ${{ github.workflow }}
-      repository-cache: true
-      cache-save: ${{ github.event_name != 'pull_request' }}
-  ```
-</details>
-
 ### `disk-cache`
 
 Enable [`disk_cache`][2] and store it on GitHub based on contents of `BUILD` files.
@@ -121,7 +97,7 @@ Default `false`.
   #### Share a single disk cache
 
   ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
+  - uses: bazel-contrib/setup-bazel@0.8.4
     with:
       disk-cache: true
   ```
@@ -129,9 +105,9 @@ Default `false`.
   #### Separate disk caches between workflows
 
   ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
+  - uses: bazel-contrib/setup-bazel@0.8.4
     with:
-      disk-cache: ${{ github.workflow }}
+      disk-cache: ${{ github.workflow }}}
   ```
 </details>
 
@@ -153,7 +129,7 @@ Default `false`.
   #### Enable external repositories caches
 
   ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
+  - uses: bazel-contrib/setup-bazel@0.8.4
     with:
       external-cache: true
   ```
@@ -161,7 +137,7 @@ Default `false`.
   #### Cache NPM repositories based on `package-lock.json` contents
 
   ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
+  - uses: bazel-contrib/setup-bazel@0.8.4
     with:
       external-cache: |
         manifest:
@@ -171,7 +147,7 @@ Default `false`.
   #### Do not cache Ruby on Windows
 
   ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
+  - uses: bazel-contrib/setup-bazel@0.8.4
     with:
       external-cache: |
         manifest:
@@ -191,42 +167,12 @@ Default `""`.
   #### Authenticate via key
 
   ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
+  - uses: bazel-contrib/setup-bazel@0.8.4
     with:
       google-credentials: ${{ secrets.GOOGLE_CLOUD_KEY }}
   ```
 </details>
 
-### `module-root`
-
-Bazel module root directory, where `MODULE.bazel` and `WORKSPACE` is found.
-
-Change this value to the module root if it's not the repository root.
-
-Default `"."`.
-
-### `output-base`
-
-Change Bazel output base directory.
-
-You might want to change it when running on self-hosted runners with a custom directory layout.
-
-Default is one of the following:
-
-- `$HOME/.bazel` on Linux and macOS
-- `D:/_bazel` on Windows
-
-<details>
-  <summary>Examples</summary>
-
-  #### Use `C` drive letter
-
-  ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
-    with:
-      output-base: C:/_bazel
-  ```
-</details>
 
 ### `repository-cache`
 
@@ -242,7 +188,7 @@ Default `false`.
   #### Store a single repository cache
 
   ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
+  - uses: bazel-contrib/setup-bazel@0.8.4
     with:
       repository-cache: true
   ```
@@ -250,19 +196,10 @@ Default `false`.
   #### Store a repository cache from a custom location
 
   ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
+  - uses: bazel-contrib/setup-bazel@0.8.4
     with:
       repository-cache: examples/gem/WORKSPACE
   ```
-
-  #### Store a repository cache from a list of custom locations
-  ```yaml
-  - uses: bazel-contrib/setup-bazel@0.18.0
-    with:
-      repository-cache: |
-        - MODULE.bazel
-        - requirements_locked.txt
-  ```
 </details>
 
 ## Migrating from [`bazelbuild/setup-bazelisk`][6]
@@ -276,7 +213,6 @@ However, if you used a `bazel-version` input before, you will need to remove it
 To build action, run the following command:
 
 ```sh
-$ npm install
 $ npm run build
 ```
 

action.yml

@@ -13,10 +13,6 @@ inputs:
     description: Extra contents to write to user .bazelrc
     required: false
     default: ""
-  cache-save:
-    description: Whether to save caches. Set to false for pull requests to allow restores but prevent saves.
-    required: false
-    default: "true"
   cache-version:
     description: Version of all caches
     required: false
@@ -33,14 +29,10 @@ inputs:
     description: Google Cloud account key for remote cache
     required: false
     default: ""
-  module-root:
-    description: Bazel module root directory. Default is `.`
+  remote-cache:
+    description: Use built-in remote cache server
     required: false
-    default: "."
-  output-base:
-    description: Bazel output base directory. Default is $HOME/.cache/bazel (POSIX) or D:/_bazel (Windows)
-    required: false
-    default: ""
+    default: "false"
   repository-cache:
     description: Cache repositories based on MODULE.bazel/WORKSPACE
     required: false
@@ -54,4 +46,3 @@ runs:
   using: node20
   main: dist/main/index.js
   post: dist/post/index.js
-  post-if: "!cancelled()"

config.js

@@ -5,30 +5,16 @@ const core = require('@actions/core')
 const github = require('@actions/github')
 
 const bazeliskVersion = core.getInput('bazelisk-version')
-const cacheSave = core.getBooleanInput('cache-save')
 const cacheVersion = core.getInput('cache-version')
-const moduleRoot = core.getInput('module-root')
+const externalCacheConfig = yaml.parse(core.getInput('external-cache'))
 
 const homeDir = os.homedir()
 const arch = os.arch()
 const platform = os.platform()
 
-let bazelOutputBase = core.getInput('output-base')
-if (!bazelOutputBase) {
-  if (platform === 'win32') {
-    // check if GITHUB_WORKSPACE starts with D:
-    if (process.env.GITHUB_WORKSPACE?.toLowerCase()?.startsWith('d:')) {
-      bazelOutputBase = 'D:/_bazel'
-    } else {
-      bazelOutputBase = `C:/_bazel`
-    }
-  } else {
-    bazelOutputBase = `${homeDir}/.bazel`
-  }
-}
-
 let bazelDisk = core.toPosixPath(`${homeDir}/.cache/bazel-disk`)
 let bazelRepository = core.toPosixPath(`${homeDir}/.cache/bazel-repo`)
+let bazelOutputBase = `${homeDir}/.bazel`
 let bazelrcPaths = [core.toPosixPath(`${homeDir}/.bazelrc`)]
 let userCacheDir = `${homeDir}/.cache`
 
@@ -37,8 +23,9 @@ switch (platform) {
     userCacheDir = `${homeDir}/Library/Caches`
     break
   case 'win32':
-    bazelDisk = `${bazelOutputBase}-disk`
-    bazelRepository = `${bazelOutputBase}-repo`
+    bazelDisk = 'D:/_bazel-disk'
+    bazelRepository = 'D:/_bazel-repo'
+    bazelOutputBase = 'D:/_bazel'
     userCacheDir = `${homeDir}/AppData/Local`
     if (process.env.HOME) {
       bazelrcPaths.push(core.toPosixPath(`${process.env.HOME}/.bazelrc`))
@@ -46,33 +33,40 @@ switch (platform) {
     break
 }
 
-const baseCacheKey = `setup-bazel-${cacheVersion}-${platform}-${arch}`
+const baseCacheKey = `setup-bazel-${cacheVersion}-${platform}`
 const bazelrc = core.getMultilineInput('bazelrc')
 
 const diskCacheConfig = core.getInput('disk-cache')
 const diskCacheEnabled = diskCacheConfig !== 'false'
 let diskCacheName = 'disk'
 if (diskCacheEnabled) {
-  // Before Bazel 6.3, providing --disk_cache to common is an error,
-  // with Bazel 6.3 and onwards, common accepts any legal Bazel option
-  // https://github.com/bazelbuild/bazel/issues/3054
   bazelrc.push(`build --disk_cache=${bazelDisk}`)
   if (diskCacheName !== 'true') {
     diskCacheName = `${diskCacheName}-${diskCacheConfig}`
   }
 }
 
-const repositoryCacheConfig = yaml.parse(core.getInput('repository-cache'))
-const repositoryCacheEnabled = repositoryCacheConfig !== false
+const remoteCacheLogPath = core.toPosixPath(`${os.tmpdir()}/remote-cache-server.log`)
+const remoteCacheServerUrl = 'http://localhost:9889/cache'
+const remoteCacheEnabled = core.getBooleanInput('remote-cache')
+if (remoteCacheEnabled) {
+  bazelrc.push(`build --remote_cache=${remoteCacheServerUrl}`)
+  if (diskCacheEnabled) {
+    core.error('Disk cache and remote cache cannot be enabled at the same time')
+  }
+}
+
+const repositoryCacheConfig = core.getInput('repository-cache')
+const repositoryCacheEnabled = repositoryCacheConfig !== 'false'
 let repositoryCacheFiles = [
-  `${moduleRoot}/MODULE.bazel`,
-  `${moduleRoot}/WORKSPACE.bazel`,
-  `${moduleRoot}/WORKSPACE.bzlmod`,
-  `${moduleRoot}/WORKSPACE`
+  'MODULE.bazel',
+  'WORKSPACE.bazel',
+  'WORKSPACE.bzlmod',
+  'WORKSPACE'
 ]
 if (repositoryCacheEnabled) {
-  bazelrc.push(`common --repository_cache=${bazelRepository}`)
-  if (repositoryCacheConfig !== true) {
+  bazelrc.push(`build --repository_cache=${bazelRepository}`)
+  if (repositoryCacheConfig !== 'true') {
     repositoryCacheFiles = Array(repositoryCacheConfig).flat()
   }
 }
@@ -80,14 +74,13 @@ if (repositoryCacheEnabled) {
 const googleCredentials = core.getInput('google-credentials')
 const googleCredentialsSaved = (core.getState('google-credentials-path').length > 0)
 if (googleCredentials.length > 0 && !googleCredentialsSaved) {
-  const tmpDir = core.toPosixPath(fs.mkdtempSync(process.env.RUNNER_TEMP))
+  const tmpDir = core.toPosixPath(fs.mkdtempSync(os.tmpdir()))
   const googleCredentialsPath = `${tmpDir}/key.json`
   fs.writeFileSync(googleCredentialsPath, googleCredentials)
   bazelrc.push(`build --google_credentials=${googleCredentialsPath}`)
   core.saveState('google-credentials-path', googleCredentialsPath)
 }
 
-const externalCacheConfig = yaml.parse(core.getInput('external-cache'))
 const bazelExternal = core.toPosixPath(`${bazelOutputBase}/external`)
 const externalCache = {}
 if (externalCacheConfig) {
@@ -100,10 +93,10 @@ if (externalCacheConfig) {
   externalCache.baseCacheKey = `${baseCacheKey}-external-`
   externalCache.manifest = {
     files: [
-      `${moduleRoot}/MODULE.bazel`,
-      `${moduleRoot}/WORKSPACE.bazel`,
-      `${moduleRoot}/WORKSPACE.bzlmod`,
-      `${moduleRoot}/WORKSPACE`
+      'MODULE.bazel',
+      'WORKSPACE.bazel',
+      'WORKSPACE.bzlmod',
+      'WORKSPACE'
     ],
     name: `external-${manifestName}-manifest`,
     path: `${os.tmpdir()}/external-cache-manifest.txt`
@@ -111,10 +104,10 @@ if (externalCacheConfig) {
   externalCache.default = {
     enabled: true,
     files: [
-      `${moduleRoot}/MODULE.bazel`,
-      `${moduleRoot}/WORKSPACE.bazel`,
-      `${moduleRoot}/WORKSPACE.bzlmod`,
-      `${moduleRoot}/WORKSPACE`
+      'MODULE.bazel',
+      'WORKSPACE.bazel',
+      'WORKSPACE.bzlmod',
+      'WORKSPACE'
     ],
     name: (name) => { return `external-${name}` },
     paths: (name) => {
@@ -133,15 +126,11 @@ if (externalCacheConfig) {
   }
 }
 
-const token = core.getInput('token')
-core.exportVariable('BAZELISK_GITHUB_TOKEN', token)
-
 module.exports = {
   baseCacheKey,
-  cacheSave,
   bazeliskCache: {
     enabled: core.getBooleanInput('bazelisk-cache'),
-    files: [`${moduleRoot}/.bazelversion`],
+    files: ['.bazelversion'],
     name: 'bazelisk',
     paths: [core.toPosixPath(`${userCacheDir}/bazelisk`)]
   },
@@ -150,9 +139,8 @@ module.exports = {
   diskCache: {
     enabled: diskCacheEnabled,
     files: [
-      ...repositoryCacheFiles,
-      `${moduleRoot}/**/BUILD.bazel`,
-      `${moduleRoot}/**/BUILD`
+      '**/BUILD.bazel',
+      '**/BUILD'
     ],
     name: diskCacheName,
     paths: [bazelDisk]
@@ -173,4 +161,9 @@ module.exports = {
     name: 'repository',
     paths: [bazelRepository]
   },
+  remoteCache: {
+    enabled: remoteCacheEnabled,
+    logPath: remoteCacheLogPath,
+    url: remoteCacheServerUrl,
+  }
 }

dist/main/remote-cache-server.js

@@ -0,0 +1,50 @@
+const http = require('http')
+const cache = require('@actions/cache')
+const fs = require('fs')
+
+// https://bazel.build/remote/caching#http-caching
+const server = http.createServer(async (req, res) => {
+  const { method, url } = req
+  const [, , cacheType, sha] = url.split('/')
+  const filePath = `/tmp/cache-${cacheType}-${sha}`
+
+  if (method === 'GET') {
+    try {
+      const cacheId = await cache.restoreCache([filePath], sha)
+      if (!cacheId) {
+        console.log(`Cache miss for ${sha}`)
+        res.writeHead(404)
+        return res.end('Cache miss')
+      }
+      const data = fs.readFileSync(filePath)
+      res.writeHead(200, { 'Content-Type': 'application/octet-stream' })
+      res.end(data)
+    } catch (error) {
+      console.error(`Error retrieving cache for ${sha}: ${error}`)
+      res.writeHead(500)
+      res.end('Internal Server Error')
+    }
+  } else if (method === 'PUT') {
+    const data = []
+    req.on('data', chunk => data.push(chunk))
+    req.on('end', async () => {
+      try {
+        fs.writeFileSync(filePath, Buffer.concat(data))
+        await cache.saveCache([filePath], sha)
+        console.log(`Cache saved for ${sha}`)
+        res.writeHead(201)
+        res.end('Cache saved')
+      } catch (error) {
+        console.error(`Error saving cache for ${sha}: ${error}`)
+        res.writeHead(500)
+        res.end('Internal Server Error')
+      }
+    })
+  } else {
+    res.writeHead(405)
+    res.end('Method Not Allowed')
+  }
+})
+
+const PORT = process.env.PORT || 8080
+server.listen(PORT, () => console.log(`Server listening on port ${PORT}`))

index.js

@@ -6,6 +6,8 @@ const github = require('@actions/github')
 const glob = require('@actions/glob')
 const tc = require('@actions/tool-cache')
 const config = require('./config')
+const { spawn } = require('child_process')
+const path = require('path')
 
 async function run() {
   try {
@@ -28,6 +30,7 @@ async function setupBazel() {
   await restoreCache(config.diskCache)
   await restoreCache(config.repositoryCache)
   await restoreExternalCaches(config.externalCache)
+  await startRemoteCacheServer()
 }
 
 async function setupBazelisk() {
@@ -38,7 +41,7 @@ async function setupBazelisk() {
   core.startGroup('Setup Bazelisk')
   let toolPath = tc.find('bazelisk', config.bazeliskVersion)
   if (toolPath) {
-    core.debug(`Found in cache @ ${toolPath}`)
+    core.info(`Found in cache @ ${toolPath}`)
   } else {
     toolPath = await downloadBazelisk()
   }
@@ -69,10 +72,8 @@ async function downloadBazelisk() {
     filename = `${filename}.exe`
   }
 
-  const token = process.env.BAZELISK_GITHUB_TOKEN
-  const octokit = github.getOctokit(token, {
-    baseUrl: 'https://api.github.com'
-  })
+  const token = core.getInput('token')
+  const octokit = github.getOctokit(token)
   const { data: releases } = await octokit.rest.repos.listReleases({
     owner: 'bazelbuild',
     repo: 'bazelisk'
@@ -91,17 +92,21 @@ async function downloadBazelisk() {
   }
 
   const url = asset.browser_download_url
-  core.debug(`Downloading from ${url}`)
+  core.info(`Downloading from ${url}`)
   const downloadPath = await tc.downloadTool(url, undefined, `token ${token}`)
 
-  core.debug('Adding to the cache...');
-  fs.chmodSync(downloadPath, '755');
-  let bazel_name = "bazel";
+  core.debug('Adding to the cache...')
+  fs.chmodSync(downloadPath, '755')
+
+  let bazelBinName = 'bazel'
+  let bazeliskBinName = 'bazelisk'
   if (platform == 'windows') {
-    bazel_name = `${bazel_name}.exe`
+    bazelBinName = `${bazelBinName}.exe`
+    bazeliskBinName = `${bazelBinName}.exe`
   }
-  const cachePath = await tc.cacheFile(downloadPath, bazel_name, 'bazelisk', version)
-  core.debug(`Successfully cached bazelisk to ${cachePath}`)
+
+  const cachePath = await tc.cacheFile(downloadPath, bazelBinName, bazeliskBinName, version)
+  core.info(`Successfully cached bazelisk to ${cachePath}`)
 
   return cachePath
 }
@@ -133,16 +138,14 @@ async function restoreExternalCaches(cacheConfig) {
   // Now restore all external caches defined in manifest
   if (fs.existsSync(path)) {
     const manifest = fs.readFileSync(path, { encoding: 'utf8' })
-    const restorePromises = manifest.split('\n').filter(s => s)
-      .map(name => {
-        return restoreCache({
-          enabled: cacheConfig[name]?.enabled ?? cacheConfig.default.enabled,
-          files: cacheConfig[name]?.files || cacheConfig.default.files,
-          name: cacheConfig.default.name(name),
-          paths: cacheConfig.default.paths(name)
-        });
-      });
-    await Promise.all(restorePromises);
+    for (const name of manifest.split('\n').filter(s => s)) {
+      await restoreCache({
+        enabled: cacheConfig[name]?.enabled ?? cacheConfig.default.enabled,
+        files: cacheConfig[name]?.files || cacheConfig.default.files,
+        name: cacheConfig.default.name(name),
+        paths: cacheConfig.default.paths(name)
+      })
+    }
   }
 }
 
@@ -152,10 +155,9 @@ async function restoreCache(cacheConfig) {
   }
 
   const delay = Math.random() * 1000 // timeout <= 1 sec to reduce 429 errors
-  await setTimeout(delay)
+  await setTimeout(delay, async function () {
+    core.startGroup(`Restore cache for ${cacheConfig.name}`)
 
-  core.startGroup(`Restore cache for ${cacheConfig.name}`)
-  try {
     const hash = await glob.hashFiles(cacheConfig.files.join('\n'))
     const name = cacheConfig.name
     const paths = cacheConfig.paths
@@ -178,11 +180,31 @@ async function restoreCache(cacheConfig) {
     } else {
       core.info(`Failed to restore ${name} cache`)
     }
-  } catch (err) {
-    core.warning(`Failed to restore ${name} cache with error: ${err}`)
-  } finally {
+
     core.endGroup()
+  }())
+}
+
+async function startRemoteCacheServer() {
+  if (!config.remoteCache.enabled) {
+    return
   }
+
+  core.startGroup("Start remote cache server")
+  core.info(`Remote cache server log file path: ${config.remoteCache.logPath}`)
+
+  const log = fs.openSync(config.remoteCache.logPath, 'a')
+  const remoteCacheServer = path.join(__dirname, '..', 'remote-cache-server', 'index.js')
+  const serverProcess = spawn(process.execPath, [remoteCacheServer], {
+    detached: true,
+    stdio: ['ignore', log, log]
+  })
+
+  core.info(`Started remote cache server with PID: ${serverProcess.pid}`)
+  core.saveState('remote-cache-server-pid', serverProcess.pid.toString())
+
+  serverProcess.unref()
+  core.endGroup()
 }
 
 run()

package.json

@@ -1,23 +1,23 @@
 {
   "name": "setup-bazel",
-  "version": "0.18.0",
+  "version": "0.8.4",
   "description": "Install and configure Bazel for GitHub Actions",
   "main": "index.js",
   "engines": {
-    "node": "24.x"
+    "node": "20.x"
   },
   "scripts": {
-    "build": "ncc build index.js -s -o dist/main && ncc build post.js -s -o dist/post",
+    "build": "ncc build index.js -s -o dist/main && ncc build post.js -s -o dist/post && ncc build remote-cache-server.js -s -o dist/remote-cache-server",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "author": "Alex Rodionov <p0deje@gmail.com>",
   "license": "MIT",
   "dependencies": {
-    "@actions/cache": "^6.0.0",
-    "@actions/core": "^3.0.0",
-    "@actions/github": "^9.0.0",
-    "@actions/glob": "^0.6.0",
-    "@actions/tool-cache": "^4.0.0",
+    "@actions/cache": "^3.2.2",
+    "@actions/core": "^1.10.1",
+    "@actions/github": "^6.0.0",
+    "@actions/glob": "^0.4.0",
+    "@actions/tool-cache": "^2.0.1",
     "@vercel/ncc": "^0.38.0",
     "yaml": "^2.2.1"
   }

post.js

@@ -5,19 +5,37 @@ const core = require('@actions/core')
 const glob = require('@actions/glob')
 const config = require('./config')
 const { getFolderSize } = require('./util')
-const process = require('node:process');
 
 async function run() {
+  await stopRemoteCacheServer()
   await saveCaches()
-  process.exit(0)
 }
 
-async function saveCaches() {
-  if (!config.cacheSave) {
-    core.info('Cache saving is disabled (cache-save: false)')
+async function stopRemoteCacheServer() {
+  if (!config.remoteCache.enabled) {
     return
   }
 
+  core.startGroup("Stop remote cache server")
+  const pid = core.getState('remote-cache-server-pid')
+  if (pid) {
+    try {
+      process.kill(pid, 'SIGTERM')
+      core.info(`Stopped remote cache server with PID: ${pid}`)
+    } catch (error) {
+      core.error(`Failed to stop remote cache server with PID: ${pid}. Error: ${error}`)
+    }
+  }
+
+  const logPath = config.remoteCache.logPath
+  if (fs.existsSync(logPath)) {
+    const logContent = fs.readFileSync(logPath, 'utf8')
+    core.debug(`Remote cache server log:\n${logContent}`)
+  }
+  core.endGroup()
+}
+
+async function saveCaches() {
   await saveCache(config.bazeliskCache)
   await saveCache(config.diskCache)
   await saveCache(config.repositoryCache)

remote-cache-server.js

@@ -0,0 +1,51 @@
+const http = require('http')
+const cache = require('@actions/cache')
+const fs = require('fs')
+
+// https://bazel.build/remote/caching#http-caching
+const server = http.createServer(async (req, res) => {
+  const { method, url } = req
+  const [, , cacheType, sha] = url.split('/')
+  const cacheKey = `setup-bazel-1-remote-cache-${sha}`
+  const filePath = `/tmp/cache-${cacheType}-${sha}`
+
+  if (method === 'GET') {
+    try {
+      const cacheId = await cache.restoreCache([filePath], cacheKey)
+      if (!cacheId) {
+        console.log(`Cache miss for ${cacheKey}`)
+        res.writeHead(404)
+        return res.end('Cache miss')
+      }
+      const data = fs.readFileSync(filePath)
+      res.writeHead(200, { 'Content-Type': 'application/octet-stream' })
+      res.end(data)
+    } catch (error) {
+      console.error(`Error retrieving cache for ${cacheKey}: ${error}`)
+      res.writeHead(500)
+      res.end('Internal Server Error')
+    }
+  } else if (method === 'PUT') {
+    const data = []
+    req.on('data', chunk => data.push(chunk))
+    req.on('end', async () => {
+      try {
+        fs.writeFileSync(filePath, Buffer.concat(data))
+        await cache.saveCache([filePath], cacheKey)
+        console.log(`Cache saved for ${cacheKey}`)
+        res.writeHead(201)
+        res.end('Cache saved')
+      } catch (error) {
+        console.error(`Error saving cache for ${cacheKey}: ${error}`)
+        res.writeHead(500)
+        res.end('Internal Server Error')
+      }
+    })
+  } else {
+    res.writeHead(405)
+    res.end('Method Not Allowed')
+  }
+})
+
+const PORT = process.env.PORT || 9889
+server.listen(PORT, () => console.log(`Server listening on port ${PORT}`))