Add support for cleaning up SDK files

README.md

@@ -72,6 +72,10 @@ To accelerate this Action, artifacts are cached once downloaded. This can be tur
 
 In practice, caching the `full` artifacts does not provide much of a speed-up. Instead, it slows it down by spending extra minutes on caching the artifact. Therefore, caching is disabled for the `full` artifacts by default, corresponding to `cache: auto`.
 
+### Clean-up
+
+On self-hosted runners, the SDK files persist after the workflow run is done. To remove these files, set the input parameter `cleanup` to `true`.
+
 ## Developing _this_ Action
 
 > First, you'll need to have a reasonably modern version of `node` handy, such as Node 12.

action.yml

@@ -21,6 +21,10 @@ inputs:
     required: false
     description: 'Where to write the SDK files'
     default: ''
+  cleanup:
+    required: false
+    description: 'Whether to clean up SDK files. This is only needed on self-hosted runners that are reused for multiple jobs.'
+    default: 'false'
   verbose:
     required: false
     description: 'Whether to log files as they are extracted'
@@ -32,3 +36,4 @@ inputs:
 runs:
   using: 'node16'
   main: 'dist/index.js'
+  post: 'dist/index.js'

main.ts

@@ -3,7 +3,16 @@ import {mkdirp} from './src/downloader'
 import {restoreCache, saveCache} from '@actions/cache'
 import process from 'process'
 import {spawnSync} from 'child_process'
-import {getViaGit} from './src/git'
+import {
+  getArtifactMetadata,
+  getViaGit,
+  gitForWindowsUsrBinPath
+} from './src/git'
+import * as fs from 'fs'
+import * as coreCommand from '@actions/core/lib/command'
+
+const flavor = core.getInput('flavor')
+const architecture = core.getInput('architecture')
 
 async function run(): Promise<void> {
   try {
@@ -13,8 +22,6 @@ async function run(): Promise<void> {
       )
       return
     }
-    const flavor = core.getInput('flavor')
-    const architecture = core.getInput('architecture')
     const verbose = core.getInput('verbose')
     const msysMode = core.getInput('msys') === 'true'
 
@@ -114,4 +121,63 @@ async function run(): Promise<void> {
   }
 }
 
-run()
+function cleanup(): void {
+  if (core.getInput('cleanup') !== 'true') {
+    core.info(
+      `Won't clean up SDK files as the 'cleanup' input was not provided or doesn't equal 'true'.`
+    )
+    return
+  }
+
+  const outputDirectory =
+    core.getInput('path') ||
+    `C:/${getArtifactMetadata(flavor, architecture).artifactName}`
+
+  /**
+   * Shelling out to `rm -rf` is more than twice as fast as Node's `fs.rmSync` method.
+   * Let's use it if it's available, and otherwise fall back to `fs.rmSync`.
+   */
+  const cleanupMethod = fs.existsSync(`${gitForWindowsUsrBinPath}/bash.exe`)
+    ? 'rm -rf'
+    : 'node'
+
+  core.info(
+    `Cleaning up ${outputDirectory} using the "${cleanupMethod}" method...`
+  )
+
+  if (cleanupMethod === 'rm -rf') {
+    const child = spawnSync(
+      `${gitForWindowsUsrBinPath}/bash.exe`,
+      ['-c', `rm -rf "${outputDirectory}"`],
+      {
+        encoding: 'utf-8',
+        env: {PATH: '/usr/bin'}
+      }
+    )
+
+    if (child.error) throw child.error
+    if (child.stderr) core.error(child.stderr)
+  } else {
+    fs.rmSync(outputDirectory, {recursive: true, force: true})
+  }
+
+  core.info(`Finished cleaning up ${outputDirectory}.`)
+}
+
+/**
+ * Indicates whether the POST action is running
+ */
+export const isPost = !!process.env['STATE_isPost']
+
+if (!isPost) {
+  run()
+  /*
+   * Publish a variable so that when the POST action runs, it can determine it should run the cleanup logic.
+   * This is necessary since we don't have a separate entry point.
+   * Inspired by https://github.com/actions/checkout/blob/v3.0.2/src/state-helper.ts#L69-L71
+   */
+  coreCommand.issueCommand('save-state', {name: 'isPost'}, 'true')
+} else {
+  // If the POST action is running, we cleanup our artifacts
+  cleanup()
+}

src/git.ts

@@ -4,7 +4,7 @@ import {Octokit} from '@octokit/rest'
 import {delimiter} from 'path'
 import * as fs from 'fs'
 
-const gitForWindowsUsrBinPath = 'C:/Program Files/Git/usr/bin'
+export const gitForWindowsUsrBinPath = 'C:/Program Files/Git/usr/bin'
 const gitExePath = 'C:/Program Files/Git/cmd/git.exe'
 
 /*
@@ -18,6 +18,17 @@ const gitExePath = 'C:/Program Files/Git/cmd/git.exe'
  */
 const GIT_CONFIG_PARAMETERS = `'checkout.workers=56'`
 
+export function getArtifactMetadata(
+  flavor: string,
+  architecture: string
+): {bitness: string; repo: string; artifactName: string} {
+  const bitness = architecture === 'i686' ? '32' : '64'
+  const repo = `git-sdk-${bitness}`
+  const artifactName = `${repo}-${flavor}`
+
+  return {bitness, repo, artifactName}
+}
+
 async function clone(
   url: string,
   destination: string,
@@ -65,10 +76,12 @@ export async function getViaGit(
     verbose?: number | boolean
   ) => Promise<void>
 }> {
-  const bitness = architecture === 'i686' ? '32' : '64'
   const owner = 'git-for-windows'
-  const repo = `git-sdk-${bitness}`
-  const artifactName = `${repo}-${flavor}`
+
+  const {bitness, repo, artifactName} = getArtifactMetadata(
+    flavor,
+    architecture
+  )
 
   const octokit = new Octokit()
   let head_sha: string