Add telemetry for compression method

lib/setup-codeql.js

@@ -397,7 +397,7 @@ const downloadCodeQL = async function (codeqlURL, maybeBundleVersion, maybeCliVe
     logger.debug(`Finished downloading CodeQL bundle to ${archivedBundlePath} (${downloadDurationMs} ms).`);
     logger.debug("Extracting CodeQL bundle.");
     const extractionStart = perf_hooks_1.performance.now();
-    const extractedBundlePath = await extractBundle(archivedBundlePath);
+    const { extractedBundlePath, compressionMethod } = await extractBundle(archivedBundlePath);
     const extractionDurationMs = Math.round(perf_hooks_1.performance.now() - extractionStart);
     logger.debug(`Finished extracting CodeQL bundle to ${extractedBundlePath} (${extractionDurationMs} ms).`);
     await cleanUpGlob(archivedBundlePath, "CodeQL bundle archive", logger);
@@ -408,6 +408,7 @@ const downloadCodeQL = async function (codeqlURL, maybeBundleVersion, maybeCliVe
         return {
             codeqlFolder: extractedBundlePath,
             statusReport: {
+                compressionMethod,
                 downloadDurationMs,
                 extractionDurationMs,
             },
@@ -424,6 +425,7 @@ const downloadCodeQL = async function (codeqlURL, maybeBundleVersion, maybeCliVe
     return {
         codeqlFolder: toolcachedBundlePath,
         statusReport: {
+            compressionMethod,
             downloadDurationMs,
             extractionDurationMs,
         },
@@ -463,14 +465,6 @@ function getCanonicalToolcacheVersion(cliVersion, bundleVersion, logger) {
 /**
  * Obtains the CodeQL bundle, installs it in the toolcache if appropriate, and extracts it.
  *
- * @param toolsInput
- * @param apiDetails
- * @param tempDir
- * @param variant
- * @param defaultCliVersion
- * @param logger
- * @param checkVersion Whether to check that CodeQL CLI meets the minimum
- *        version requirement. Must be set to true outside tests.
  * @returns the path to the extracted bundle, and the version of the tools
  */
 async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger) {
@@ -522,8 +516,18 @@ async function cleanUpGlob(glob, name, logger) {
 }
 async function extractBundle(archivedBundlePath) {
     if (archivedBundlePath.endsWith(".tar.gz")) {
-        return await toolcache.extractTar(archivedBundlePath);
+        return {
+            compressionMethod: "gzip",
+            // While we could also ask tar to autodetect the compression method,
+            // we defensively keep the gzip call identical as requesting a gzipped
+            // bundle will soon be a fallback option.
+            extractedBundlePath: await toolcache.extractTar(archivedBundlePath),
+        };
     }
-    return await toolcache.extractTar(archivedBundlePath, undefined, "x");
+    return {
+        compressionMethod: "zstd",
+        // tar will autodetect the compression method
+        extractedBundlePath: await toolcache.extractTar(archivedBundlePath, undefined, "x"),
+    };
 }
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