Function run

packages/container/src/util.ts:133–191

(
  cmd: string,
  args: string[],
  opts: { cwd?: string; input?: string; quiet?: boolean } = {}
)

 * Run a command, streaming its output to stderr while capturing it for parsing.
 */
export function run(
  cmd: string,
  args: string[],
  opts: { cwd?: string; input?: string; quiet?: boolean } = {}
): Promise<RunResult> {
  return new Promise((resolve, reject) => {
    const child = spawn(cmd, args, {
      cwd: opts.cwd,
      stdio: [opts.input !== undefined ? 'pipe' : 'ignore', 'pipe', 'pipe'],
    });

    let stdout = '';
    let stderr = '';

    child.stdout?.on('data', (chunk: Buffer) => {
      const text = chunk.toString();
      stdout += text;
      if (!opts.quiet) {
        process.stderr.write(text);
      }
    });
    child.stderr?.on('data', (chunk: Buffer) => {
      const text = chunk.toString();
      stderr += text;
      if (!opts.quiet) {
        process.stderr.write(text);
      }
    });

    child.on('error', (err: NodeJS.ErrnoException) => {
      if (err.code === 'ENOENT') {
        reject(
          new Error(
            `Command not found: \`${cmd}\`. Ensure \`${cmd}\` is installed and on your PATH.`
          )
        );
        return;
      }
      reject(err);
    });
    child.on('close', code => {
      if (code === 0) {
        resolve({ stdout, stderr });
      } else {
        const detail = stderr.trim().split('\n').slice(-5).join('\n');
        reject(
          new Error(
            `\`${cmd} ${args.join(' ')}\` exited with code ${code}` +
              (detail ? `\n${detail}` : '')
          )
        );
      }
    });

    if (opts.input !== undefined) {
      child.stdin?.end(opts.input);
    }
  });