Function runPythonInstall

electron/utils/uv-setup.ts:112–168

* Run `uv python install 3.12` once with the given environment. * Returns on success, throws with captured stderr on failure.

(
  uvBin: string,
  env: Record<string, string | undefined>,
  label: string,
)

 * Returns on success, throws with captured stderr on failure.
 */
async function runPythonInstall(
  uvBin: string,
  env: Record<string, string | undefined>,
  label: string,
): Promise<void> {
  const useShell = needsWinShell(uvBin);
  return new Promise<void>((resolve, reject) => {
    const stderrChunks: string[] = [];
    const stdoutChunks: string[] = [];

    const child = spawn(useShell ? quoteForCmd(uvBin) : uvBin, ['python', 'install', '3.12'], {
      shell: useShell,
      env,
      windowsHide: true,
    });

    child.stdout?.on('data', (data) => {
      const line = data.toString().trim();
      if (line) {
        stdoutChunks.push(line);
        logger.debug(`[python-setup:${label}] stdout: ${line}`);
      }
    });

    child.stderr?.on('data', (data) => {
      const line = data.toString().trim();
      if (line) {
        stderrChunks.push(line);
        logger.info(`[python-setup:${label}] stderr: ${line}`);
      }
    });

    child.on('close', (code) => {
      if (code === 0) {
        resolve();
      } else {
        const stderr = stderrChunks.join('\n');
        const stdout = stdoutChunks.join('\n');
        const detail = stderr || stdout || '(no output captured)';
        reject(new Error(
          `Python installation failed with code ${code} [${label}]\n` +
          `  uv binary: ${uvBin}\n` +
          `  platform: ${process.platform}/${process.arch}\n` +
          `  output: ${detail}`
        ));
      }
    });

    child.on('error', (err) => {
      reject(new Error(
        `Python installation spawn error [${label}]: ${err.message}\n` +
        `  uv binary: ${uvBin}\n` +
        `  platform: ${process.platform}/${process.arch}`
      ));
    });
  });
}