Prefer explicit env var to binary accessibility check

src/config-utils.ts

@@ -54,7 +54,6 @@ import {
   getCodeQLMemoryLimit,
   getErrorMessage,
   isInTestMode,
-  isBinaryAccessible,
 } from "./util";
 
 export * from "./config/db-config";
@@ -937,10 +936,13 @@ export async function initConfig(
     await logGitVersionTelemetry(config, gitVersion);
   } catch (e) {
     logger.warning(`Could not determine Git version: ${getErrorMessage(e)}`);
-    // Throw the error in test mode so it's more visible, but tolerate cases
-    // where the git binary is not present, for example because we're running
-    // in a Docker container.
-    if (isInTestMode() && (await isBinaryAccessible("git", logger))) {
+    // Throw the error in test mode so it's more visible, unless the environment
+    // variable is set to tolerate this, for example because we're running in a
+    // Docker container where git may not be available.
+    if (
+      isInTestMode() &&
+      process.env.CODEQL_ACTION_TOLERATE_MISSING_GIT_VERSION !== "true"
+    ) {
       throw e;
     }
   }

src/environment.ts

@@ -129,4 +129,10 @@ export enum EnvVar {
    * the workflow is valid and validation is not necessary.
    */
   SKIP_WORKFLOW_VALIDATION = "CODEQL_ACTION_SKIP_WORKFLOW_VALIDATION",
+
+  /**
+   * Whether to tolerate failure to determine the git version (only applicable in test mode).
+   * Intended for use in environments where git may not be installed, such as Docker containers.
+   */
+  TOLERATE_MISSING_GIT_VERSION = "CODEQL_ACTION_TOLERATE_MISSING_GIT_VERSION",
 }

src/git-utils.ts

@@ -40,9 +40,6 @@ export class GitVersionInfo {
 /**
  * Gets the version of Git installed on the system and throws an error if
  * the version cannot be determined.
- *
- * @returns The Git version string (e.g., "2.40.0").
- * @throws {Error} if the version could not be determined.
  */
 export async function getGitVersionOrThrow(): Promise<GitVersionInfo> {
   const stdout = await runGitCommand(