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Re: [PATCH v4 05/24] python: add qemu package installer

From: Cleber Rosa
Subject: Re: [PATCH v4 05/24] python: add qemu package installer
Date: Tue, 16 Feb 2021 21:23:05 -0500

On Thu, Feb 11, 2021 at 01:58:37PM -0500, John Snow wrote:
> Add setup.cfg and setup.py, necessary for installing a package via
> pip. Add a rst document explaining the basics of what this package is

Nitpick 1: setup.cfg and setup.py are indeed used by pip, your
statement is correct.  But, it hides the fact that these can be used
without pip.  On a source tree based install, you may want to simply
use "python setup.py develop" to achieve what "pip install -e" would
do (without pip ever entering the picture).

Nitpick 2: while most people will understand what you mean by "rst
document", I believe that "Add a README file in reStructuredText
format" would be more obvious.

> for and who to contact for more information. This document will be used
> as the landing page for the package on PyPI.
> I am not yet using a pyproject.toml style package manifest, because
> "editable" installs are not defined by PEP-517 and pip did not have
> support for this for some time; I consider the feature necessary for
> development.

I'm glad you kept it like this... I bet there's going to be another
PEP out, replacing the status quo, by the time I finish this review.

> Use a light-weight setup.py instead.
> Signed-off-by: John Snow <jsnow@redhat.com>
> ---
>  python/PACKAGE.rst | 32 ++++++++++++++++++++++++++++++++
>  python/setup.cfg   | 19 +++++++++++++++++++
>  python/setup.py    | 23 +++++++++++++++++++++++
>  3 files changed, 74 insertions(+)
>  create mode 100644 python/PACKAGE.rst
>  create mode 100644 python/setup.cfg
>  create mode 100755 python/setup.py
> diff --git a/python/PACKAGE.rst b/python/PACKAGE.rst
> new file mode 100644
> index 00000000000..0e714c87eb3
> --- /dev/null
> +++ b/python/PACKAGE.rst
> @@ -0,0 +1,32 @@
> +QEMU Python Tooling
> +===================
> +
> +This package provides QEMU tooling used by the QEMU project to build,
> +configure, and test QEMU. It is not a fully-fledged SDK and it is subject
> +to change at any time.
> +
> +Usage
> +-----
> +
> +The ``qemu.qmp`` subpackage provides a library for communicating with
> +QMP servers. The ``qemu.machine`` subpackage offers rudimentary
> +facilities for launching and managing QEMU processes. Refer to each
> +package's documentation
> +(``>>> help(qemu.qmp)``, ``>>> help(qemu.machine)``)
> +for more information.
> +

This gives the impression that those are the only subpackages (and
they were).  Better to reword it taking into account the qemu.utils
subpackage and possibly others (leave it open so that it doesn't rot
so quickly).

- Cleber.

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