Function _hook_install

pre_commit/repository.py:65–106

(hook: Hook)

def _hook_install(hook: Hook) -> None:
    logger.info(f'Installing environment for {hook.src}.')
    logger.info('Once installed this environment will be reused.')
    logger.info('This may take a few minutes...')

    lang = languages[hook.language]
    assert lang.ENVIRONMENT_DIR is not None

    venv = environment_dir(
        hook.prefix,
        lang.ENVIRONMENT_DIR,
        hook.language_version,
    )

    # There's potentially incomplete cleanup from previous runs
    # Clean it up!
    if os.path.exists(venv):
        rmtree(venv)

    with clean_path_on_failure(venv):
        lang.install_environment(
            hook.prefix, hook.language_version, hook.additional_dependencies,
        )
        health_error = lang.health_check(hook.prefix, hook.language_version)
        if health_error:
            raise AssertionError(
                f'BUG: expected environment for {hook.language} to be healthy '
                f'immediately after install, please open an issue describing '
                f'your environment\n\n'
                f'more info:\n\n{health_error}',
            )

        # TODO: remove v1 state writing, no longer needed after pre-commit 3.0
        # Write our state to indicate we're installed
        state_filename = _state_filename_v1(venv)
        staging = f'{state_filename}staging'
        with open(staging, 'w') as state_file:
            state_file.write(json.dumps(_state(hook.additional_dependencies)))
        # Move the file into place atomically to indicate we've installed
        os.replace(staging, state_filename)

        open(_state_filename_v2(venv), 'a+').close()


def _hook(