Use zstd instead of gzip

__tests__/restore.test.ts

@@ -2,7 +2,7 @@ import * as core from "@actions/core";
 import * as path from "path";
 
 import * as cacheHttpClient from "../src/cacheHttpClient";
-import { Events, Inputs } from "../src/constants";
+import { CacheFilename, Events, Inputs } from "../src/constants";
 import { ArtifactCacheEntry } from "../src/contracts";
 import run from "../src/restore";
 import * as tar from "../src/tar";
@@ -227,7 +227,7 @@ test("restore with cache found", async () => {
         return Promise.resolve(tempPath);
     });
 
-    const archivePath = path.join(tempPath, "cache.tgz");
+    const archivePath = path.join(tempPath, CacheFilename);
     const setCacheStateMock = jest.spyOn(actionUtils, "setCacheState");
     const downloadCacheMock = jest.spyOn(cacheHttpClient, "downloadCache");
 
@@ -297,7 +297,7 @@ test("restore with a pull request event and cache found", async () => {
         return Promise.resolve(tempPath);
     });
 
-    const archivePath = path.join(tempPath, "cache.tgz");
+    const archivePath = path.join(tempPath, CacheFilename);
     const setCacheStateMock = jest.spyOn(actionUtils, "setCacheState");
     const downloadCacheMock = jest.spyOn(cacheHttpClient, "downloadCache");
 
@@ -364,7 +364,7 @@ test("restore with cache found for restore key", async () => {
         return Promise.resolve(tempPath);
     });
 
-    const archivePath = path.join(tempPath, "cache.tgz");
+    const archivePath = path.join(tempPath, CacheFilename);
     const setCacheStateMock = jest.spyOn(actionUtils, "setCacheState");
     const downloadCacheMock = jest.spyOn(cacheHttpClient, "downloadCache");
 

__tests__/tar.test.ts

@@ -45,7 +45,15 @@ test("extract tar", async () => {
     expect(execMock).toHaveBeenCalledTimes(1);
     expect(execMock).toHaveBeenCalledWith(
         `"${tarPath}"`,
-        ["-xz", "-f", archivePath, "-P", "-C", workspace],
+        [
+            "--use-compress-program",
+            "zstd --long=31 -d",
+            "-xf",
+            archivePath,
+            "-P",
+            "-C",
+            workspace
+        ],
         { cwd: undefined }
     );
 });
@@ -70,8 +78,9 @@ test("create tar", async () => {
     expect(execMock).toHaveBeenCalledWith(
         `"${tarPath}"`,
         [
-            "-cz",
+            "--use-compress-program",
-            "-f",
+            "zstd -T0 --long=31",
+            "-cf",
             CacheFilename,
             "-C",
             workspace,

src/constants.ts

@@ -19,4 +19,4 @@ export enum Events {
     PullRequest = "pull_request"
 }
 
-export const CacheFilename = "cache.tgz";
+export const CacheFilename = "cache.tar.zst";

src/restore.ts

@@ -2,7 +2,7 @@ import * as core from "@actions/core";
 import * as path from "path";
 
 import * as cacheHttpClient from "./cacheHttpClient";
-import { Events, Inputs, State } from "./constants";
+import { CacheFilename, Events, Inputs, State } from "./constants";
 import { extractTar } from "./tar";
 import * as utils from "./utils/actionUtils";
 
@@ -63,7 +63,7 @@ async function run(): Promise<void> {
 
             const archivePath = path.join(
                 await utils.createTempDirectory(),
-                "cache.tgz"
+                CacheFilename
             );
             core.debug(`Archive Path: ${archivePath}`);
 

src/tar.ts

@@ -39,7 +39,15 @@ export async function extractTar(archivePath: string): Promise<void> {
     // Create directory to extract tar into
     const workingDirectory = getWorkingDirectory();
     await io.mkdirP(workingDirectory);
-    const args = ["-xz", "-f", archivePath, "-P", "-C", workingDirectory];
+    const args = [
+        "--use-compress-program",
+        "zstd --long=31 -d",
+        "-xf",
+        archivePath,
+        "-P",
+        "-C",
+        workingDirectory
+    ];
     await execTar(args);
 }
 
@@ -56,8 +64,9 @@ export async function createTar(
 
     const workingDirectory = getWorkingDirectory();
     const args = [
-        "-cz",
+        "--use-compress-program",
-        "-f",
+        "zstd -T0 --long=31",
+        "-cf",
         CacheFilename,
         "-C",
         workingDirectory,