gh-90548: Allow Alpine/MUSL to pass test_c_locale_coercion. #134454
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Like cygwin, MUSL defaults to utf-8 if no variables are set. I have no idea if the existing tests pass on cygwin, but I made the modifications such that I shouldn't break it if is. The additional checks needed for MUSL are guarded by DEFAULT_LOCALE_IS_C being False. Based on this flag, we expect utf-8 for the encodings and no coercion message, as long as LC_ALL is not set to C. (That looks like a bit of an issue with the test structure, but I'm not going to attempt to "fix" that.) DEFAULT_ENCODING is intentionally not given a default since it is only used when DEFAULT_LOCALE_IS_C is False, and if you use the flag you'll need to set it. After reading through issue 30672, looking at the source, and running a test on Android, I *think* the current situation is that coercion will be done if the local is set to POSIX regardless of platform. However, if the platform doesn't make POSIX equivalent to C, the encodings when coercion is disabled will not be the same as for C (it is utf-8 on android, for example). This means the tests would fail if POSIX were added unconditionally to the EXPECTED_C_LOCALE_EQUIVALENTS as envisioned in the issue. This *could* be fixed with another flag, but I'm not sure it is worth the effort. I'm not even sure Python is behaving optimally in this case (assuming my analysis is correct). So I just altered the comment and add POSIX if and only if the platform is linux.
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cc @ncoghlan |
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Like cygwin, MUSL defaults to utf-8 if no variables are set. I have no idea if the existing tests pass on cygwin, but I made the modifications such that I shouldn't break it if is. The additional checks needed for MUSL are guarded by DEFAULT_LOCALE_IS_C being False. Based on this flag, we expect utf-8 for the encodings and no coercion message, as long as LC_ALL is not set to C. (That looks like a bit of an issue with the test structure, but I'm not going to attempt to "fix" that.) DEFAULT_ENCODING is intentionally not given a default since it is only used when DEFAULT_LOCALE_IS_C is False, and if you use the flag you'll need to set it.
After reading through issue 30672, looking at the source, and running a test on Android, I think the current situation is that coercion will be done if the local is set to POSIX regardless of platform. However, if the platform doesn't make POSIX equivalent to C, the encodings when coercion is disabled will not be the same as for C (it is utf-8 on android, for example). This means the tests would fail if POSIX were added unconditionally to the EXPECTED_C_LOCALE_EQUIVALENTS as envisioned in the issue. This could be fixed with another flag, but I'm not sure it is worth the effort. I'm not even sure Python is behaving optimally in this case (assuming my analysis is correct). So I just altered the comment and add POSIX if and only if the platform is linux.