tags._linux_platforms breaks when _PYTHON_HOST_PLATFORM is set
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Description
When using a dirty hack to build custom platform-specific wheels for Alpine (setting _PYTHON_HOST_PLATFORM to "alpine", which distutils.util.get_platform() returns untouched), packaging.tags._linux_platforms() raises a ValueError: not enough values to unpack (expected 2, got 1) on _, arch = linux.split("_", 1). The simplest solution would be to use *_, arch = ... instead, but that could cause unexpected behavior if distutils.util.get_platform() returns "x86_64"; I'm not sure if that actually matters, though :)
We're fixing this on our side by just using "linux_alpine" for our tag instead of just "alpine", but this might want a fix here anyway since it's very dependent on the exact format of the response from get_platform().
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start at packaging.tags._linux_platforms() and reproduce the failure with _PYTHON_HOST_PLATFORM set to "alpine". Inspect how the value returned by distutils.util.get_platform() is split, then verify that the chosen handling avoids the ValueError without introducing incorrect behavior for platform values such as "x86_64".
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100