Reduce duplication in the logs when errors occur in CLI commands

CHANGELOG.md

@@ -4,7 +4,7 @@ See the [releases page](https://github.com/github/codeql-action/releases) for th
 
 ## [UNRELEASED]
 
-No user facing changes.
+- Improve the log output when an error occurs in an invocation of the CodeQL CLI. [#1927](https://github.com/github/codeql-action/pull/1927)
 
 ## 2.22.1 - 09 Oct 2023
 

src/analyze.ts

@@ -394,14 +394,10 @@ export async function runQueries(
         await runPrintLinesOfCode(language);
       }
     } catch (e) {
-      logger.info(String(e));
-      if (e instanceof Error) {
-        logger.info(e.stack!);
-      }
       statusReport.analyze_failure_language = language;
       throw new CodeQLAnalysisError(
         statusReport,
-        `Error running analysis for ${language}: ${e}`,
+        `Error running analysis for ${language}: ${util.wrapError(e).message}`,
       );
     }
   }

src/codeql.test.ts

@@ -1133,7 +1133,7 @@ test("database finalize does not override no code found error on CodeQL 2.12.4",
     {
       message:
         'Encountered a fatal error while running "codeql-for-testing database finalize --finalize-dataset --threads=2 --ram=2048 db". ' +
-        `Exit code was 32 and error was: ${cliMessage}`,
+        `Exit code was 32 and last log line was: ${cliMessage} See the logs for more details.`,
     },
   );
 });
@@ -1158,7 +1158,26 @@ test("runTool summarizes several fatal errors", async (t) => {
     {
       message:
         'Encountered a fatal error while running "codeql-for-testing database finalize --finalize-dataset --threads=2 --ram=2048 db". ' +
-        `Exit code was 32 and error was: ${datasetImportError}. Context: ${heapError}.`,
+        `Exit code was 32 and error was: ${datasetImportError}. Context: ${heapError}. See the logs for more details.`,
+    },
+  );
+});
+
+test("runTool outputs last line of stderr if fatal error could not be found", async (t) => {
+  const cliStderr = "line1\nline2\nline3\nline4\nline5";
+  stubToolRunnerConstructor(32, cliStderr);
+  const codeqlObject = await codeql.getCodeQLForTesting();
+  sinon.stub(codeqlObject, "getVersion").resolves(makeVersionInfo("2.12.4"));
+  // safeWhich throws because of the test CodeQL object.
+  sinon.stub(safeWhich, "safeWhich").resolves("");
+
+  await t.throwsAsync(
+    async () =>
+      await codeqlObject.finalizeDatabase("db", "--threads=2", "--ram=2048"),
+    {
+      message:
+        'Encountered a fatal error while running "codeql-for-testing database finalize --finalize-dataset --threads=2 --ram=2048 db". ' +
+        "Exit code was 32 and last log line was: line5. See the logs for more details.",
     },
   );
 });

src/codeql.ts

@@ -54,15 +54,27 @@ export class CommandInvocationError extends Error {
     cmd: string,
     args: string[],
     public exitCode: number,
-    public error: string,
-    public output: string,
+    public stderr: string,
+    public stdout: string,
   ) {
     const prettyCommand = [cmd, ...args]
       .map((x) => (x.includes(" ") ? `'${x}'` : x))
       .join(" ");
+
+    const fatalErrors = extractFatalErrors(stderr);
+    const lastLine = stderr.trim().split("\n").pop()?.trim();
+    let error = fatalErrors
+      ? ` and error was: ${fatalErrors.trim()}`
+      : lastLine
+      ? ` and last log line was: ${lastLine}`
+      : "";
+    if (error[error.length - 1] !== ".") {
+      error += ".";
+    }
+
     super(
       `Encountered a fatal error while running "${prettyCommand}". ` +
-        `Exit code was ${exitCode} and error was: ${error.trim()}`,
+        `Exit code was ${exitCode}${error} See the logs for more details.`,
     );
   }
 }
@@ -1238,7 +1250,6 @@ async function runTool(
     ...(opts.stdin ? { input: Buffer.from(opts.stdin || "") } : {}),
   }).exec();
   if (exitCode !== 0) {
-    error = extractFatalErrors(error) || error;
     throw new CommandInvocationError(cmd, args, exitCode, error, output);
   }
   return output;
@@ -1454,7 +1465,7 @@ function isNoCodeFoundError(e: CommandInvocationError): boolean {
    */
   const javascriptNoCodeFoundWarning =
     "No JavaScript or TypeScript code found.";
-  return e.exitCode === 32 || e.error.includes(javascriptNoCodeFoundWarning);
+  return e.exitCode === 32 || e.stderr.includes(javascriptNoCodeFoundWarning);
 }
 
 async function isDiagnosticsExportInvalidSarifFixed(