can1357/oh-my-pi · error

Could not make verifier executable: ${chmod.stderr.trim()}

Error message

Could not make verifier executable: ${chmod.stderr.trim()}

What it means

After confirming /tests/test.sh exists, runTrial runs `chmod +x /tests/test.sh` inside the VM. This error is thrown if chmod exits non-zero; the command's trimmed stderr is included in the message to explain why the file could not be made executable.

Source

Thrown at packages/metaharness/src/tb/trial.ts:223

		await client.stop().catch(() => {});
		client = null;
		checkDeadline();

		opts.log?.("verify");
		// Docker's default capability set denies CAP_SYS_TIME, but root inside a
		// microVM can change its clock. Restore host UTC before verification so
		// agent certificate workarounds cannot poison verifier networking.
		const hostEpoch = Math.floor(Date.now() / 1_000);
		await vm.exec(`date -u -s @${hostEpoch} >/dev/null 2>&1 || true`, { timeoutSec: 10 });
		const verifierStartedAt = performance.now();
		let verifierExitCode: number | null = null;
		let verifierFailure: string | null = null;
		try {
			await vm.copyDirectory(path.join(opts.task.dir, "tests"), "/tests");
			const script = await vm.exec("test -f /tests/test.sh");
			if (script.exitCode !== 0) throw new Error("Verifier script /tests/test.sh is missing");
			const chmod = await vm.exec("chmod +x /tests/test.sh");
			if (chmod.exitCode !== 0) throw new Error(`Could not make verifier executable: ${chmod.stderr.trim()}`);
			const verifier = await vm.exec("bash /tests/test.sh > /logs/verifier/test-stdout.txt 2>&1", {
				timeoutSec: opts.task.verifierTimeoutSec,
				env: opts.task.verifierEnv,
				cwd: vm.workdir,
			});
			verifierExitCode = verifier.exitCode;
		} catch (error) {
			verifierFailure = errorMessage(error);
		} finally {
			verifierMs = elapsedMs(verifierStartedAt);
		}
		checkDeadline();

		const rewardText = await vm.readFile("/logs/verifier/reward.txt");
		const parsedReward = rewardText === null ? Number.NaN : Number.parseFloat(rewardText.trim());
		const reward = Number.isFinite(parsedReward) && parsedReward >= 0 && parsedReward <= 1 ? parsedReward : null;
		const verifierOutput = (await vm.readFile("/logs/verifier/test-stdout.txt")) ?? "";
		await writeArtifact(opts.trialDir, "test-stdout.txt", verifierOutput);

View on GitHub (pinned to 9690622007)

Solutions

1. Read the embedded chmod stderr for the precise errno (EACCES, ENOSPC, not found)
2. Ensure /tests is on a writable filesystem in the VM
3. Free guest disk space if the error indicates no space
4. Copy files with mode preserved, or make test.sh executable at the source before copyDirectory

Example fix

// before
const chmod = await vm.exec("chmod +x /tests/test.sh");
// after: ensure writability, or set the exec bit in the source tree
await vm.exec("mount -o remount,rw / && chmod +x /tests/test.sh");

const check = await vm.exec("test -w /tests && command -v chmod");
if (check.exitCode !== 0) throw new Error("Guest cannot chmod /tests: image or mount is unsuitable");

try {
  await runTrial(opts);
} catch (err) {
  if (String(err.message).startsWith("Could not make verifier executable")) {
    // remount writable or fall back to `bash /tests/test.sh` (no exec bit needed)
    await remountRw(vm);
    return runTrial(opts);
  }
  throw err;
}

When it happens

Trigger: chmod failing inside the guest: read-only mount of /tests, full filesystem, or a guest image whose shell cannot run chmod, even though the file itself exists.

Common situations: Guest images mounted with noexec/read-only volumes; disk full after copying large test fixtures; minimal images lacking the chmod binary.

Understand the failure class

Background: Permission denied / not authorized / 403 Forbidden: access-control rejections when the caller lacks the required role, grant, or ownership — this error's family across 18 libraries.

Related errors

• Could not make omp executable: ${chmod.stderr.trim()}
• {}: {error}
• inter-device move failed: {} to {}; unable to remove target:
• Permission denied
• cannot stat {file}: {error}

AI-assisted analysis of can1357/oh-my-pi@9690622007 (2026-08-31). Data as JSON: /api/errors/20f63e1b17930f51. Report an issue: GitHub.