Run file command

lib/tar.js

@@ -139,6 +139,9 @@ async function extractTarZst(tar, tarVersion, logger) {
     logger.debug(`Extracting to ${dest}.${tar instanceof stream.Readable
         ? ` Input stream has high water mark ${tar.readableHighWaterMark}.`
         : ""}`);
+    if (typeof tar === "string") {
+        await (0, actions_util_1.runTool)("file", [tar]);
+    }
     try {
         // Initialize args
         const args = ["-x", "--zstd", "-v"];

src/tar.ts

@@ -8,7 +8,7 @@ import * as toolcache from "@actions/tool-cache";
 import { safeWhich } from "@chrisgavin/safe-which";
 import { v4 as uuidV4 } from "uuid";
 
-import { CommandInvocationError, getTemporaryDirectory } from "./actions-util";
+import { CommandInvocationError, getTemporaryDirectory, runTool } from "./actions-util";
 import { Logger } from "./logging";
 import { assertNever, cleanUpGlob } from "./util";
 
@@ -150,6 +150,10 @@ export async function extractTarZst(
     }`,
   );
 
+  if (typeof tar === "string") {
+    await runTool("file", [tar]);
+  }
+
   try {
     // Initialize args
     const args = ["-x", "--zstd", "-v"];