When running pip-compile click context has no src_files, so select_config_file returns pyproject.toml, but after compiling click context has src_files as requirements/test.in, so select_config_file returns None and so pyproject.toml != None
Making --config is_eager=False works

Perhaps, src_files should be eager instead of config. Which makes sense, because --config depends on src_files in override_defaults_from_config_file.

oh maybe in override_defaults_from_config_file it should return None if there is no config in the file.
So config should be None, if pyproject.toml is empty

def override_defaults_from_config_file(
    ctx: click.Context, param: click.Parameter, value: str | None
) -> Path | None:
    if ctx.params.get("no_config"):
        return None

    if value is None:
        config_file = select_config_file(ctx.params.get("src_files", ()))
        if config_file is None:
            return None
    else:
        config_file = Path(value)

    config = parse_config_file(config_file)
    if not config:
        return None
    _assign_config_to_cli_context(ctx, config)
    return config_file

It seems this is an another bug

It seems this is an another bug

Arguably empty config is still a config.

But why does not it found configuration in this case:

- pyproject.toml
- requirements
-- test.in

pyproject.toml is not empty
with src_files = ('requirements/test.in',) config_file is None

But why does not it found configuration in this case:

@q0w I'm not following. Could you please elaborate?

When src_files is ('requirements/test.in',) it does not find a config file from pyproject.toml. Use an example from this issue and add a pip-tools configuration in pyproject.toml to reproduce.

select_config_file(('requirements/test.in',)) is None because it searches config in requirements/pyproject.toml.

select_config_file called twice, when parsing args and in get_compile_command() and gives different results, because:

• on first call src_files is empty, because it's not yet handled (not eager)
• on second call src_files non-empty - all args are handled

Which is why is_eager=True flag on src_files fixes the issue.

Yes, but I think it should find pyproject.toml because pip-tools is called in PWD=., not requirements dir

@q0w agreed 👍🏻 select_config_file should search for configs in PWD and in src_files dirs. Currently, it searches in PWD or src_files dirs.