mirror of https://github.com/python/cpython
372 lines
16 KiB
Python
372 lines
16 KiB
Python
# Tests the attempted automatic coercion of the C locale to a UTF-8 locale
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import unittest
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import locale
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import os
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import sys
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import sysconfig
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import shutil
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import subprocess
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from collections import namedtuple
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import test.support
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from test.support.script_helper import (
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run_python_until_end,
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interpreter_requires_environment,
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)
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# Set our expectation for the default encoding used in the C locale
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# for the filesystem encoding and the standard streams
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# AIX uses iso8859-1 in the C locale, other *nix platforms use ASCII
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if sys.platform.startswith("aix"):
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C_LOCALE_STREAM_ENCODING = "iso8859-1"
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else:
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C_LOCALE_STREAM_ENCODING = "ascii"
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# FS encoding is UTF-8 on macOS, other *nix platforms use the locale encoding
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if sys.platform == "darwin":
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C_LOCALE_FS_ENCODING = "utf-8"
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else:
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C_LOCALE_FS_ENCODING = C_LOCALE_STREAM_ENCODING
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# Note that the above is probably still wrong in some cases, such as:
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# * Windows when PYTHONLEGACYWINDOWSFSENCODING is set
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# * AIX and any other platforms that use latin-1 in the C locale
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#
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# Options for dealing with this:
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# * Don't set PYTHON_COERCE_C_LOCALE on such platforms (e.g. Windows doesn't)
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# * Fix the test expectations to match the actual platform behaviour
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# In order to get the warning messages to match up as expected, the candidate
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# order here must much the target locale order in Python/pylifecycle.c
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_C_UTF8_LOCALES = ("C.UTF-8", "C.utf8", "UTF-8")
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# There's no reliable cross-platform way of checking locale alias
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# lists, so the only way of knowing which of these locales will work
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# is to try them with locale.setlocale(). We do that in a subprocess
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# to avoid altering the locale of the test runner.
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#
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# If the relevant locale module attributes exist, and we're not on a platform
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# where we expect it to always succeed, we also check that
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# `locale.nl_langinfo(locale.CODESET)` works, as if it fails, the interpreter
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# will skip locale coercion for that particular target locale
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_check_nl_langinfo_CODESET = bool(
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sys.platform not in ("darwin", "linux") and
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hasattr(locale, "nl_langinfo") and
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hasattr(locale, "CODESET")
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)
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def _set_locale_in_subprocess(locale_name):
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cmd_fmt = "import locale; print(locale.setlocale(locale.LC_CTYPE, '{}'))"
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if _check_nl_langinfo_CODESET:
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# If there's no valid CODESET, we expect coercion to be skipped
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cmd_fmt += "; import sys; sys.exit(not locale.nl_langinfo(locale.CODESET))"
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cmd = cmd_fmt.format(locale_name)
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result, py_cmd = run_python_until_end("-c", cmd, __isolated=True)
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return result.rc == 0
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_fields = "fsencoding stdin_info stdout_info stderr_info lang lc_ctype lc_all"
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_EncodingDetails = namedtuple("EncodingDetails", _fields)
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class EncodingDetails(_EncodingDetails):
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# XXX (ncoghlan): Using JSON for child state reporting may be less fragile
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CHILD_PROCESS_SCRIPT = ";".join([
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"import sys, os",
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"print(sys.getfilesystemencoding())",
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"print(sys.stdin.encoding + ':' + sys.stdin.errors)",
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"print(sys.stdout.encoding + ':' + sys.stdout.errors)",
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"print(sys.stderr.encoding + ':' + sys.stderr.errors)",
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"print(os.environ.get('LANG', 'not set'))",
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"print(os.environ.get('LC_CTYPE', 'not set'))",
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"print(os.environ.get('LC_ALL', 'not set'))",
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])
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@classmethod
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def get_expected_details(cls, coercion_expected, fs_encoding, stream_encoding, env_vars):
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"""Returns expected child process details for a given encoding"""
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_stream = stream_encoding + ":{}"
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# stdin and stdout should use surrogateescape either because the
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# coercion triggered, or because the C locale was detected
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stream_info = 2*[_stream.format("surrogateescape")]
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# stderr should always use backslashreplace
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stream_info.append(_stream.format("backslashreplace"))
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expected_lang = env_vars.get("LANG", "not set").lower()
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if coercion_expected:
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expected_lc_ctype = CLI_COERCION_TARGET.lower()
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else:
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expected_lc_ctype = env_vars.get("LC_CTYPE", "not set").lower()
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expected_lc_all = env_vars.get("LC_ALL", "not set").lower()
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env_info = expected_lang, expected_lc_ctype, expected_lc_all
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return dict(cls(fs_encoding, *stream_info, *env_info)._asdict())
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@staticmethod
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def _handle_output_variations(data):
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"""Adjust the output to handle platform specific idiosyncrasies
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* Some platforms report ASCII as ANSI_X3.4-1968
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* Some platforms report ASCII as US-ASCII
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* Some platforms report UTF-8 instead of utf-8
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"""
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data = data.replace(b"ANSI_X3.4-1968", b"ascii")
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data = data.replace(b"US-ASCII", b"ascii")
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data = data.lower()
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return data
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@classmethod
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def get_child_details(cls, env_vars):
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"""Retrieves fsencoding and standard stream details from a child process
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Returns (encoding_details, stderr_lines):
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- encoding_details: EncodingDetails for eager decoding
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- stderr_lines: result of calling splitlines() on the stderr output
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The child is run in isolated mode if the current interpreter supports
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that.
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"""
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result, py_cmd = run_python_until_end(
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"-c", cls.CHILD_PROCESS_SCRIPT,
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__isolated=True,
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**env_vars
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)
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if not result.rc == 0:
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result.fail(py_cmd)
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# All subprocess outputs in this test case should be pure ASCII
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adjusted_output = cls._handle_output_variations(result.out)
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stdout_lines = adjusted_output.decode("ascii").splitlines()
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child_encoding_details = dict(cls(*stdout_lines)._asdict())
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stderr_lines = result.err.decode("ascii").rstrip().splitlines()
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return child_encoding_details, stderr_lines
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# Details of the shared library warning emitted at runtime
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LEGACY_LOCALE_WARNING = (
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"Python runtime initialized with LC_CTYPE=C (a locale with default ASCII "
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"encoding), which may cause Unicode compatibility problems. Using C.UTF-8, "
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"C.utf8, or UTF-8 (if available) as alternative Unicode-compatible "
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"locales is recommended."
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)
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# Details of the CLI locale coercion warning emitted at runtime
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CLI_COERCION_WARNING_FMT = (
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"Python detected LC_CTYPE=C: LC_CTYPE coerced to {} (set another locale "
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"or PYTHONCOERCECLOCALE=0 to disable this locale coercion behavior)."
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)
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AVAILABLE_TARGETS = None
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CLI_COERCION_TARGET = None
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CLI_COERCION_WARNING = None
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def setUpModule():
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global AVAILABLE_TARGETS
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global CLI_COERCION_TARGET
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global CLI_COERCION_WARNING
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if AVAILABLE_TARGETS is not None:
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# initialization already done
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return
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AVAILABLE_TARGETS = []
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# Find the target locales available in the current system
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for target_locale in _C_UTF8_LOCALES:
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if _set_locale_in_subprocess(target_locale):
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AVAILABLE_TARGETS.append(target_locale)
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if AVAILABLE_TARGETS:
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# Coercion is expected to use the first available target locale
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CLI_COERCION_TARGET = AVAILABLE_TARGETS[0]
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CLI_COERCION_WARNING = CLI_COERCION_WARNING_FMT.format(CLI_COERCION_TARGET)
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class _LocaleHandlingTestCase(unittest.TestCase):
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# Base class to check expected locale handling behaviour
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def _check_child_encoding_details(self,
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env_vars,
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expected_fs_encoding,
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expected_stream_encoding,
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expected_warnings,
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coercion_expected):
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"""Check the C locale handling for the given process environment
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Parameters:
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expected_fs_encoding: expected sys.getfilesystemencoding() result
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expected_stream_encoding: expected encoding for standard streams
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expected_warning: stderr output to expect (if any)
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"""
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result = EncodingDetails.get_child_details(env_vars)
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encoding_details, stderr_lines = result
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expected_details = EncodingDetails.get_expected_details(
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coercion_expected,
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expected_fs_encoding,
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expected_stream_encoding,
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env_vars
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)
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self.assertEqual(encoding_details, expected_details)
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if expected_warnings is None:
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expected_warnings = []
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self.assertEqual(stderr_lines, expected_warnings)
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class LocaleConfigurationTests(_LocaleHandlingTestCase):
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# Test explicit external configuration via the process environment
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def setUpClass():
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# This relies on setupModule() having been run, so it can't be
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# handled via the @unittest.skipUnless decorator
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if not AVAILABLE_TARGETS:
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raise unittest.SkipTest("No C-with-UTF-8 locale available")
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def test_external_target_locale_configuration(self):
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# Explicitly setting a target locale should give the same behaviour as
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# is seen when implicitly coercing to that target locale
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self.maxDiff = None
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expected_fs_encoding = "utf-8"
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expected_stream_encoding = "utf-8"
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base_var_dict = {
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"LANG": "",
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"LC_CTYPE": "",
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"LC_ALL": "",
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}
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for env_var in ("LANG", "LC_CTYPE"):
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for locale_to_set in AVAILABLE_TARGETS:
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# XXX (ncoghlan): LANG=UTF-8 doesn't appear to work as
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# expected, so skip that combination for now
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# See https://bugs.python.org/issue30672 for discussion
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if env_var == "LANG" and locale_to_set == "UTF-8":
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continue
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with self.subTest(env_var=env_var,
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configured_locale=locale_to_set):
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var_dict = base_var_dict.copy()
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var_dict[env_var] = locale_to_set
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self._check_child_encoding_details(var_dict,
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expected_fs_encoding,
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expected_stream_encoding,
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expected_warnings=None,
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coercion_expected=False)
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@test.support.cpython_only
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@unittest.skipUnless(sysconfig.get_config_var("PY_COERCE_C_LOCALE"),
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"C locale coercion disabled at build time")
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class LocaleCoercionTests(_LocaleHandlingTestCase):
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# Test implicit reconfiguration of the environment during CLI startup
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def _check_c_locale_coercion(self,
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fs_encoding, stream_encoding,
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coerce_c_locale,
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expected_warnings=None,
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coercion_expected=True,
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**extra_vars):
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"""Check the C locale handling for various configurations
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Parameters:
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fs_encoding: expected sys.getfilesystemencoding() result
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stream_encoding: expected encoding for standard streams
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coerce_c_locale: setting to use for PYTHONCOERCECLOCALE
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None: don't set the variable at all
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str: the value set in the child's environment
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expected_warnings: expected warning lines on stderr
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extra_vars: additional environment variables to set in subprocess
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"""
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self.maxDiff = None
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if not AVAILABLE_TARGETS:
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# Locale coercion is disabled when there aren't any target locales
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fs_encoding = C_LOCALE_FS_ENCODING
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stream_encoding = C_LOCALE_STREAM_ENCODING
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coercion_expected = False
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if expected_warnings:
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expected_warnings = [LEGACY_LOCALE_WARNING]
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base_var_dict = {
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"LANG": "",
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"LC_CTYPE": "",
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"LC_ALL": "",
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}
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base_var_dict.update(extra_vars)
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for env_var in ("LANG", "LC_CTYPE"):
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for locale_to_set in ("", "C", "POSIX", "invalid.ascii"):
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# XXX (ncoghlan): *BSD platforms don't behave as expected in the
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# POSIX locale, so we skip that for now
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# See https://bugs.python.org/issue30672 for discussion
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if locale_to_set == "POSIX":
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continue
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with self.subTest(env_var=env_var,
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nominal_locale=locale_to_set,
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PYTHONCOERCECLOCALE=coerce_c_locale):
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var_dict = base_var_dict.copy()
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var_dict[env_var] = locale_to_set
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if coerce_c_locale is not None:
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var_dict["PYTHONCOERCECLOCALE"] = coerce_c_locale
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# Check behaviour on successful coercion
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self._check_child_encoding_details(var_dict,
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fs_encoding,
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stream_encoding,
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expected_warnings,
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coercion_expected)
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def test_test_PYTHONCOERCECLOCALE_not_set(self):
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# This should coerce to the first available target locale by default
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self._check_c_locale_coercion("utf-8", "utf-8", coerce_c_locale=None)
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def test_PYTHONCOERCECLOCALE_not_zero(self):
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# *Any* string other than "0" is considered "set" for our purposes
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# and hence should result in the locale coercion being enabled
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for setting in ("", "1", "true", "false"):
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self._check_c_locale_coercion("utf-8", "utf-8", coerce_c_locale=setting)
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def test_PYTHONCOERCECLOCALE_set_to_warn(self):
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# PYTHONCOERCECLOCALE=warn enables runtime warnings for legacy locales
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self._check_c_locale_coercion("utf-8", "utf-8",
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coerce_c_locale="warn",
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expected_warnings=[CLI_COERCION_WARNING])
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def test_PYTHONCOERCECLOCALE_set_to_zero(self):
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# The setting "0" should result in the locale coercion being disabled
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self._check_c_locale_coercion(C_LOCALE_FS_ENCODING,
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C_LOCALE_STREAM_ENCODING,
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coerce_c_locale="0",
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coercion_expected=False)
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# Setting LC_ALL=C shouldn't make any difference to the behaviour
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self._check_c_locale_coercion(C_LOCALE_FS_ENCODING,
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C_LOCALE_STREAM_ENCODING,
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coerce_c_locale="0",
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LC_ALL="C",
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coercion_expected=False)
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def test_LC_ALL_set_to_C(self):
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# Setting LC_ALL should render the locale coercion ineffective
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self._check_c_locale_coercion(C_LOCALE_FS_ENCODING,
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C_LOCALE_STREAM_ENCODING,
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coerce_c_locale=None,
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LC_ALL="C",
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coercion_expected=False)
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# And result in a warning about a lack of locale compatibility
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self._check_c_locale_coercion(C_LOCALE_FS_ENCODING,
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C_LOCALE_STREAM_ENCODING,
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coerce_c_locale="warn",
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LC_ALL="C",
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expected_warnings=[LEGACY_LOCALE_WARNING],
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coercion_expected=False)
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def test_main():
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test.support.run_unittest(
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LocaleConfigurationTests,
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LocaleCoercionTests
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)
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test.support.reap_children()
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if __name__ == "__main__":
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test_main()
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