Common getCompressionMethod for listTar and extractTar

packages/cache/src/internal/constants.ts

@@ -11,6 +11,12 @@ export enum CompressionMethod {
   Zstd = 'zstd'
 }
 
+export enum TarOperation {
+  Create = 'create',
+  List = 'list',
+  Extract = 'extract'
+}
+
 // The default number of retry attempts.
 export const DefaultRetryAttempts = 2
 

packages/cache/src/internal/tar.ts

@@ -3,7 +3,9 @@ import * as io from '@actions/io'
 import {existsSync, writeFileSync} from 'fs'
 import * as path from 'path'
 import * as utils from './cacheUtils'
-import {CompressionMethod} from './constants'
+import {CompressionMethod, TarOperation} from './constants'
+
+const IS_WINDOWS = process.platform === 'win32'
 
 async function getTarPath(
   args: string[],
@@ -54,6 +56,41 @@ function getWorkingDirectory(): string {
   return process.env['GITHUB_WORKSPACE'] ?? process.cwd()
 }
 
+// Common function for extractTar and listTar to get the compression method
+function getCompressionProgram(compressionMethod: CompressionMethod): string[] {
+  // -d: Decompress.
+  // unzstd is equivalent to 'zstd -d'
+  // --long=#: Enables long distance matching with # bits. Maximum is 30 (1GB) on 32-bit OS and 31 (2GB) on 64-bit.
+  // Using 30 here because we also support 32-bit self-hosted runners.
+  switch (compressionMethod) {
+    case CompressionMethod.Zstd:
+      return [
+        '--use-compress-program',
+        IS_WINDOWS ? 'zstd -d --long=30' : 'unzstd --long=30',
+      ]
+    case CompressionMethod.ZstdWithoutLong:
+      return [
+        '--use-compress-program',
+        IS_WINDOWS ? 'zstd -d' : 'unzstd',
+      ]
+    default:
+      return ['-z']
+  }
+}
+
+export async function listTar(
+  archivePath: string,
+  compressionMethod: CompressionMethod
+): Promise<void> {
+  const args = [
+    getCompressionProgram(compressionMethod),
+    '-tf',
+    archivePath.replace(new RegExp(`\\${path.sep}`, 'g'), '/'),
+    '-P'
+  ]
+  await execTar(args, compressionMethod)
+}
+
 export async function extractTar(
   archivePath: string,
   compressionMethod: CompressionMethod
@@ -61,28 +98,8 @@ export async function extractTar(
   // Create directory to extract tar into
   const workingDirectory = getWorkingDirectory()
   await io.mkdirP(workingDirectory)
-  // -d: Decompress.
-  // unzstd is equivalent to 'zstd -d'
-  // --long=#: Enables long distance matching with # bits. Maximum is 30 (1GB) on 32-bit OS and 31 (2GB) on 64-bit.
-  // Using 30 here because we also support 32-bit self-hosted runners.
-  function getCompressionProgram(): string[] {
-    switch (compressionMethod) {
-      case CompressionMethod.Zstd:
-        if (process.platform === 'win32') {
-          return ['--use-compress-program', 'zstd -d --long=30']
-        }
-        return ['--use-compress-program', 'unzstd --long=30']
-      case CompressionMethod.ZstdWithoutLong:
-        if (process.platform === 'win32') {
-          return ['--use-compress-program', 'zstd -d']
-        }
-        return ['--use-compress-program', 'unzstd']
-      default:
-        return ['-z']
-    }
-  }
   const args = [
-    ...getCompressionProgram(),
+    getCompressionProgram(compressionMethod),
     '-xf',
     archivePath.replace(new RegExp(`\\${path.sep}`, 'g'), '/'),
     '-P',
@@ -114,15 +131,15 @@ export async function createTar(
   function getCompressionProgram(): string[] {
     switch (compressionMethod) {
       case CompressionMethod.Zstd:
-        if (process.platform === 'win32') {
-          return ['--use-compress-program', 'zstd -T0 --long=30']
-        }
-        return ['--use-compress-program', 'zstdmt --long=30']
+        return [
+          '--use-compress-program',
+          IS_WINDOWS ? 'zstd -T0 --long=30' : 'zstdmt --long=30'
+        ]
       case CompressionMethod.ZstdWithoutLong:
-        if (process.platform === 'win32') {
-          return ['--use-compress-program', 'zstd -T0']
-        }
-        return ['--use-compress-program', 'zstdmt']
+        return [
+          '--use-compress-program',
+          IS_WINDOWS ? 'zstd -T0' : 'zstdmt'
+        ]
       default:
         return ['-z']
     }
@@ -141,38 +158,4 @@ export async function createTar(
     manifestFilename
   ]
   await execTar(args, compressionMethod, archiveFolder)
-}
-
-export async function listTar(
-  archivePath: string,
-  compressionMethod: CompressionMethod
-): Promise<void> {
-  // -d: Decompress.
-  // unzstd is equivalent to 'zstd -d'
-  // --long=#: Enables long distance matching with # bits.
-  // Maximum is 30 (1GB) on 32-bit OS and 31 (2GB) on 64-bit.
-  // Using 30 here because we also support 32-bit self-hosted runners.
-  function getCompressionProgram(): string[] {
-    switch (compressionMethod) {
-      case CompressionMethod.Zstd:
-        if (process.platform === 'win32') {
-          return ['--use-compress-program', 'zstd -d --long=30']
-        }
-        return ['--use-compress-program', 'unzstd --long=30']
-      case CompressionMethod.ZstdWithoutLong:
-        if (process.platform === 'win32') {
-          return ['--use-compress-program', 'zstd -d']
-        }
-        return ['--use-compress-program', 'unzstd']
-      default:
-        return ['-z']
-    }
-  }
-  const args = [
-    ...getCompressionProgram(),
-    '-tf',
-    archivePath.replace(new RegExp(`\\${path.sep}`, 'g'), '/'),
-    '-P'
-  ]
-  await execTar(args, compressionMethod)
-}
+}