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Another step in further separating python2 from python3.
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Currently there is only one line difference regarding bootstrapped-pip,
but this will change in the future with the whole Python world moving
towards PEP 517.
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Reproducible builds of pyproject projects using pip is resolved.
Fixes https://github.com/pypa/pip/issues/7808
Fixes https://github.com/NixOS/nixpkgs/issues/81441
The more recent c409f694807e8cd16db8e2affb630073c1aadc48 caused trouble
with pyproject troubles and had to be reverted anyway.
https://github.com/NixOS/nixpkgs/pull/102222#issuecomment-722380794
Revert "pythonPackages.pip: make reproducible (#102222)"
This reverts commit c409f694807e8cd16db8e2affb630073c1aadc48.
Revert "python3Packages.pip: allow setting reproducible temporary directory via NIX_PIP_INSTALL_TMPDIR"
This reverts commit aedbade43e615d7893d268632f5e7f2570fd3233.
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The previous attempt wasn't covering all of the bases. It relied on
invoking that pip-install-hook, and didn't apply to pip itself.
The core issue is that the generated .pyc files embed some of the
temporary paths, which are randomly generated. See
https://r13y.com/diff/bf8c3ca3148ebff9ecf41f294cc60b9f209c006d49699e356969ff32d736f1c6-8806a7cca91fdd300e48736bfcd57c4d0b54c1cc2fd61609f35143170862b59c.html
In this new attempt, the approach is to patch the TempFile
implementation directly, so that it creates stable temporary
directories. We also assume that if SOURCE_DATE_EPOCH is set, we are in
a scenario where reproducible builds are desirable and enter that
branch.
See also https://github.com/pypa/pip/issues/7808
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NIX_PIP_INSTALL_TMPDIR
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Since wheel support was introduced in 2015 we always relied on pre-built
wheels for bootstrapping. Now, we can bootstrap directly from the
sources of these packages in git.
The `bootstrapped-pip` packages is used to build `pip`, `setuptools` and `wheel`,
after which those packages are used to build everything else.
Note that when building `bootstrapped-pip` some errors are shown.
These are not important, the build actually does succeed and work as intended.
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This commit splits the `buildPythonPackage` into multiple setup hooks.
Generally, Python packages are built from source to wheels using `setuptools`.
The wheels are then installed with `pip`. Tests were often called with
`python setup.py test` but this is less common nowadays. Most projects
now use a different entry point for running tests, typically `pytest`
or `nosetests`.
Since the wheel format was introduced more tools were built to generate these,
e.g. `flit`. Since PEP 517 is provisionally accepted, defining a build-system
independent format (`pyproject.toml`), `pip` can now use that format to
execute the correct build-system.
In the past I've added support for PEP 517 (`pyproject`) to the Python
builder, resulting in a now rather large builder. Furthermore, it was not possible
to reuse components elsewhere. Therefore, the builder is now split into multiple
setup hooks.
The `setuptoolsCheckHook` is included now by default but in time it should
be removed from `buildPythonPackage` to make it easier to use another hook
(curently one has to pass in `dontUseSetuptoolsCheck`).
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