Throw configuration error when tar is not available

src/setup-codeql.ts

@@ -653,6 +653,11 @@ export async function setupCodeQLBundle(
   defaultCliVersion: CodeQLDefaultVersionInfo,
   logger: Logger,
 ) {
+  if (!(await util.isBinaryAccessible("tar", logger))) {
+    throw new util.ConfigurationError(
+      "Could not find tar in PATH, so unable to extract CodeQL bundle.",
+    );
+  }
   const zstdAvailability = await tar.isZstdAvailable(logger);
 
   const source = await getCodeQLSource(

src/tar.ts

@@ -10,7 +10,7 @@ import { v4 as uuidV4 } from "uuid";
 
 import { CommandInvocationError, getTemporaryDirectory } from "./actions-util";
 import { Logger } from "./logging";
-import { assertNever, cleanUpGlob } from "./util";
+import { assertNever, cleanUpGlob, isBinaryAccessible } from "./util";
 
 const MIN_REQUIRED_BSD_TAR_VERSION = "3.4.3";
 const MIN_REQUIRED_GNU_TAR_VERSION = "1.31";
@@ -20,20 +20,6 @@ export type TarVersion = {
   version: string;
 };
 
-async function isBinaryAccessible(
-  binary: string,
-  logger: Logger,
-): Promise<boolean> {
-  try {
-    await safeWhich(binary);
-    logger.debug(`Found ${binary}.`);
-    return true;
-  } catch (e) {
-    logger.debug(`Could not find ${binary}: ${e}`);
-    return false;
-  }
-}
-
 async function getTarVersion(): Promise<TarVersion> {
   const tar = await safeWhich("tar");
   let stdout = "";

src/util.ts

@@ -5,6 +5,7 @@ import { promisify } from "util";
 
 import * as core from "@actions/core";
 import * as exec from "@actions/exec/lib/exec";
+import { safeWhich } from "@chrisgavin/safe-which";
 import checkDiskSpace from "check-disk-space";
 import del from "del";
 import getFolderSize from "get-folder-size";
@@ -1187,3 +1188,17 @@ export async function cleanUpGlob(glob: string, name: string, logger: Logger) {
     logger.warning(`Failed to clean up ${name}: ${e}.`);
   }
 }
+
+export async function isBinaryAccessible(
+  binary: string,
+  logger: Logger,
+): Promise<boolean> {
+  try {
+    await safeWhich(binary);
+    logger.debug(`Found ${binary}.`);
+    return true;
+  } catch (e) {
+    logger.debug(`Could not find ${binary}: ${e}`);
+    return false;
+  }
+}