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revert docs about cross-platform building
We won't have correct dependencies when parsing the METADATA files because we need to pass the target platforms there. I think I got too happy too soon about the possibility of having correct builds with just 'download_only = True'.
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docs/pypi-dependencies.md

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@@ -307,59 +307,6 @@ leg of the dependency manually. For instance by making
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perhaps `apache-airflow-providers-common-sql`.
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(bazel-downloader)=
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### Multi-platform support
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Multi-platform support of cross-building the wheels can be done in two ways - either
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using {bzl:attr}`experimental_index_url` for the {bzl:obj}`pip.parse` bzlmod tag class
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or by using the {bzl:attr}`pip.parse.download_only` setting. In this section we
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are going to outline quickly how one can use the latter option.
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Let's say you have 2 requirements files:
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```
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# requirements.linux_x86_64.txt
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--platform=manylinux_2_17_x86_64
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--python-version=39
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--implementation=cp
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--abi=cp39
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foo==0.0.1 --hash=sha256:deadbeef
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bar==0.0.1 --hash=sha256:deadb00f
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```
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```
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# requirements.osx_aarch64.txt contents
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--platform=macosx_10_9_arm64
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--python-version=39
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--implementation=cp
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--abi=cp39
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foo==0.0.3 --hash=sha256:deadbaaf
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```
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With these 2 files your {bzl:obj}`pip.parse` could look like:
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```
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pip.parse(
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hub_name = "pip",
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python_version = "3.9",
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# Tell `pip` to ignore sdists
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download_only = True,
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requirements_by_platform = {
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"requirements.linux_x86_64.txt": "linux_x86_64",
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"requirements.osx_aarch64.txt": "osx_aarch64",
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},
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)
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```
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With this, the `pip.parse` will create a hub repository that is going to
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support only two platforms - `cp39_osx_aarch64` and `cp39_linux_x86_64` and it
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will only use `wheels` and ignore any sdists that it may find on the PyPI
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compatible indexes.
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```{note}
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This is only supported on `bzlmd`.
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```
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(bazel-downloader)=
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### Bazel downloader and multi-platform wheel hub repository.
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