Function detectVenvRoot

packages/runtime-core/src/python-env.ts:153–164

* Detects the virtual environment root for a given Python executable path. * * Checks for `pyvenv.cfg` which is the standard marker for Python venvs. * Handles both `/path/to/venv/bin/python` and `/path/to/venv/Scripts/python.exe`. * * @returns The venv root directory, or null if the Python is

(pythonExecutable: string)

 * @returns The venv root directory, or null if the Python is not in a venv
 */
async function detectVenvRoot(pythonExecutable: string): Promise<string | null> {
  const binDir = dirname(pythonExecutable)
  const possibleVenvRoot = dirname(binDir)

  const pyvenvCfg = join(possibleVenvRoot, 'pyvenv.cfg')
  const cfgStat = await stat(pyvenvCfg).catch(() => null)
  if (cfgStat?.isFile()) {
    return possibleVenvRoot
  }

  return null
}

/**
 * Builds environment variables appropriate for the resolved Python executable.