Cache installations in GitHub tool-cache.

Fixes #7

src/constants.ts

@@ -1,6 +1,4 @@
 import * as otypes from '@octokit/types'
-import {homedir} from 'os'
-import {join} from 'path'
 
 export const IS_LINUX = process.platform === 'linux'
 export const IS_MACOS = process.platform === 'darwin'
@@ -9,7 +7,6 @@ export const IS_WINDOWS = process.platform === 'win32'
 export const VERSION_DEV = 'dev'
 export const VERSION_LATEST = 'latest'
 
-export const GRAALVM_BASE = join(homedir(), '.graalvm')
 export const GRAALVM_FILE_EXTENSION = IS_WINDOWS ? '.zip' : '.tar.gz'
 export const GRAALVM_GH_USER = 'graalvm'
 export const GRAALVM_PLATFORM = IS_WINDOWS ? 'windows' : process.platform

src/graalvm.ts

@@ -1,5 +1,9 @@
 import * as c from './constants'
-import {downloadAndExtractJDK, getLatestRelease} from './utils'
+import {
+  downloadAndExtractJDK,
+  downloadExtractAndCacheJDK,
+  getLatestRelease
+} from './utils'
 
 const GRAALVM_CE_DL_BASE =
   'https://github.com/graalvm/graalvm-ce-builds/releases/download'
@@ -40,7 +44,8 @@ export async function setUpGraalVMRelease(
 ): Promise<string> {
   const graalVMIdentifier = determineGraalVMIdentifier(version, javaVersion)
   const downloadUrl = `${GRAALVM_CE_DL_BASE}/${GRAALVM_TAG_PREFIX}${version}/${graalVMIdentifier}${c.GRAALVM_FILE_EXTENSION}`
-  return downloadAndExtractJDK(downloadUrl)
+  const toolName = determineToolName(javaVersion)
+  return downloadExtractAndCacheJDK(downloadUrl, toolName, version)
 }
 
 function determineGraalVMIdentifier(
@@ -49,3 +54,7 @@ function determineGraalVMIdentifier(
 ): string {
   return `graalvm-ce-java${javaVersion}-${c.GRAALVM_PLATFORM}-amd64-${version}`
 }
+
+function determineToolName(javaVersion: string): string {
+  return `graalvm-ce-java${javaVersion}-${c.GRAALVM_PLATFORM}`
+}

src/main.ts

@@ -2,7 +2,6 @@ import * as c from './constants'
 import * as core from '@actions/core'
 import * as graalvm from './graalvm'
 import {join} from 'path'
-import {mkdirP} from '@actions/io'
 import {setUpDependencies} from './dependencies'
 import {setUpGUComponents} from './gu'
 import {setUpMandrel} from './mandrel'
@@ -27,8 +26,6 @@ async function run(): Promise<void> {
       await setUpNativeImageMusl()
     }
 
-    await mkdirP(c.GRAALVM_BASE)
-
     // Download or build GraalVM
     let graalVMHome
     switch (graalvmVersion) {

src/mandrel.ts

@@ -1,5 +1,5 @@
 import * as c from './constants'
-import {downloadAndExtractJDK, getLatestRelease} from './utils'
+import {downloadExtractAndCacheJDK, getLatestRelease} from './utils'
 
 const MANDREL_REPO = 'mandrel'
 const MANDREL_TAG_PREFIX = c.MANDREL_NAMESPACE
@@ -46,7 +46,8 @@ async function setUpMandrelRelease(
 ): Promise<string> {
   const identifier = determineMandrelIdentifier(version, javaVersion)
   const downloadUrl = `${MANDREL_DL_BASE}/${MANDREL_TAG_PREFIX}${version}/${identifier}${c.GRAALVM_FILE_EXTENSION}`
-  return downloadAndExtractJDK(downloadUrl)
+  const toolName = determineToolName(javaVersion)
+  return downloadExtractAndCacheJDK(downloadUrl, toolName, version)
 }
 
 function determineMandrelIdentifier(
@@ -55,3 +56,7 @@ function determineMandrelIdentifier(
 ): string {
   return `mandrel-java${javaVersion}-${c.GRAALVM_PLATFORM}-amd64-${version}`
 }
+
+function determineToolName(javaVersion: string): string {
+  return `mandrel-java${javaVersion}-${c.GRAALVM_PLATFORM}`
+}

src/utils.ts

@@ -32,18 +32,37 @@ export async function getLatestRelease(
 export async function downloadAndExtractJDK(
   downloadUrl: string
 ): Promise<string> {
+  return findJavaHomeInSubfolder(await downloadAndExtract(downloadUrl))
+}
+
+export async function downloadExtractAndCacheJDK(
+  downloadUrl: string,
+  toolName: string,
+  version: string
+): Promise<string> {
+  let toolPath = tc.find(toolName, version)
+  if (toolPath) {
+    core.info(`Found ${toolName} ${version} in tool-cache @ ${toolPath}`)
+  } else {
+    const extractDir = await downloadAndExtract(downloadUrl)
+    core.info(`Adding ${toolName} ${version} to tool-cache ...`)
+    toolPath = await tc.cacheDir(extractDir, toolName, version)
+  }
+  return findJavaHomeInSubfolder(toolPath)
+}
+
+async function downloadAndExtract(downloadUrl: string): Promise<string> {
   const downloadPath = await tc.downloadTool(downloadUrl)
   if (downloadUrl.endsWith('.tar.gz')) {
-    await tc.extractTar(downloadPath, c.GRAALVM_BASE)
+    return await tc.extractTar(downloadPath)
   } else if (downloadUrl.endsWith('.zip')) {
-    await tc.extractZip(downloadPath, c.GRAALVM_BASE)
+    return await tc.extractZip(downloadPath)
   } else {
     throw new Error(`Unexpected filetype downloaded: ${downloadUrl}`)
   }
-  return findJavaHomeInSubfolder(c.GRAALVM_BASE)
 }
 
-export function findJavaHomeInSubfolder(searchPath: string): string {
+function findJavaHomeInSubfolder(searchPath: string): string {
   const baseContents = readdirSync(searchPath)
   if (baseContents.length === 1) {
     return join(searchPath, baseContents[0], c.JDK_HOME_SUFFIX)