esp-idf/tools/idf.py

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#!/usr/bin/env python
#
# SPDX-FileCopyrightText: 2019-2023 Espressif Systems (Shanghai) CO LTD
#
# SPDX-License-Identifier: Apache-2.0
#
# 'idf.py' is a top-level config/build command line tool for ESP-IDF
#
# You don't have to use idf.py, you can use cmake directly
# (or use cmake in an IDE)
# WARNING: we don't check for Python build-time dependencies until
# check_environment() function below. If possible, avoid importing
# any external libraries here - put in external script, or import in
# their specific function instead.
import codecs
import json
import locale
import os
import os.path
import shlex
import subprocess
import sys
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from collections import Counter, OrderedDict, _OrderedDictKeysView
from importlib import import_module
from pkgutil import iter_modules
from typing import Any, Callable, Dict, List, Optional, Union
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# pyc files remain in the filesystem when switching between branches which might raise errors for incompatible
# idf.py extensions. Therefore, pyc file generation is turned off:
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sys.dont_write_bytecode = True
import python_version_checker # noqa: E402
try:
from idf_py_actions.errors import FatalError # noqa: E402
from idf_py_actions.tools import (PROG, SHELL_COMPLETE_RUN, SHELL_COMPLETE_VAR, PropertyDict, # noqa: E402
debug_print_idf_version, get_target, merge_action_lists, print_warning)
if os.getenv('IDF_COMPONENT_MANAGER') != '0':
from idf_component_manager import idf_extensions
except ImportError as e:
# For example, importing click could cause this.
print((f'Cannot import module "{e.name}". This usually means that "idf.py" was not '
f'spawned within an ESP-IDF shell environment or the python virtual '
f'environment used by "idf.py" is corrupted.\n'
f'Please use idf.py only in an ESP-IDF shell environment. If problem persists, '
f'please try to install ESP-IDF tools again as described in the Get Started guide.'),
file=sys.stderr)
sys.exit(1)
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# Use this Python interpreter for any subprocesses we launch
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PYTHON = sys.executable
# note: os.environ changes don't automatically propagate to child processes,
# you have to pass env=os.environ explicitly anywhere that we create a process
os.environ['PYTHON'] = sys.executable
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def check_environment() -> List:
"""
Verify the environment contains the top-level tools we need to operate
(cmake will check a lot of other things)
"""
checks_output = []
# verify that IDF_PATH env variable is set
# find the directory idf.py is in, then the parent directory of this, and assume this is IDF_PATH
detected_idf_path = os.path.realpath(os.path.join(os.path.dirname(__file__), '..'))
if 'IDF_PATH' in os.environ:
set_idf_path = os.path.realpath(os.environ['IDF_PATH'])
if set_idf_path != detected_idf_path:
print_warning(
'WARNING: IDF_PATH environment variable is set to %s but %s path indicates IDF directory %s. '
'Using the environment variable directory, but results may be unexpected...' %
(set_idf_path, PROG, detected_idf_path))
else:
print_warning('Setting IDF_PATH environment variable: %s' % detected_idf_path)
os.environ['IDF_PATH'] = detected_idf_path
try:
# The Python compatibility check could have been done earlier (tools/detect_python.{sh,fish}) but PATH is
# not set for import at that time. Even if the check would be done before, the same check needs to be done
# here as well (for example one can call idf.py from a not properly set-up environment).
python_version_checker.check()
except RuntimeError as e:
raise FatalError(e)
# check Python dependencies
checks_output.append('Checking Python dependencies...')
try:
out = subprocess.check_output(
[
os.environ['PYTHON'],
os.path.join(os.environ['IDF_PATH'], 'tools', 'idf_tools.py'),
'check-python-dependencies',
],
env=os.environ,
)
checks_output.append(out.decode('utf-8', 'ignore').strip())
except subprocess.CalledProcessError as e:
print_warning(e.output.decode('utf-8', 'ignore'), stream=sys.stderr)
debug_print_idf_version()
raise SystemExit(1)
return checks_output
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def _safe_relpath(path: str, start: Optional[str]=None) -> str:
""" Return a relative path, same as os.path.relpath, but only if this is possible.
It is not possible on Windows, if the start directory and the path are on different drives.
"""
try:
return os.path.relpath(path, os.curdir if start is None else start)
except ValueError:
return os.path.abspath(path)
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def init_cli(verbose_output: List=None) -> Any:
# Click is imported here to run it after check_environment()
import click
class Deprecation(object):
"""Construct deprecation notice for help messages"""
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def __init__(self, deprecated: Union[Dict, str, bool]=False) -> None:
self.deprecated = deprecated
self.since = None
self.removed = None
self.exit_with_error = None
self.custom_message = ''
if isinstance(deprecated, dict):
self.custom_message = deprecated.get('message', '')
self.since = deprecated.get('since', None)
self.removed = deprecated.get('removed', None)
self.exit_with_error = deprecated.get('exit_with_error', None)
elif isinstance(deprecated, str):
self.custom_message = deprecated
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def full_message(self, type: str='Option') -> str:
if self.exit_with_error:
return '%s is deprecated %sand was removed%s.%s' % (
type,
'since %s ' % self.since if self.since else '',
' in %s' % self.removed if self.removed else '',
' %s' % self.custom_message if self.custom_message else '',
)
else:
return '%s is deprecated %sand will be removed in%s.%s' % (
type,
'since %s ' % self.since if self.since else '',
' %s' % self.removed if self.removed else ' future versions',
' %s' % self.custom_message if self.custom_message else '',
)
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def help(self, text: str, type: str='Option', separator: str=' ') -> str:
text = text or ''
return self.full_message(type) + separator + text if self.deprecated else text
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def short_help(self, text: str) -> str:
text = text or ''
return ('Deprecated! ' + text) if self.deprecated else text
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def check_deprecation(ctx: click.core.Context) -> None:
"""Prints deprecation warnings for arguments in given context"""
for option in ctx.command.params:
default = () if option.multiple else option.default
if isinstance(option, Option) and option.deprecated and ctx.params[option.name] != default:
deprecation = Deprecation(option.deprecated)
if deprecation.exit_with_error:
raise FatalError('Error: %s' % deprecation.full_message('Option "%s"' % option.name))
else:
print_warning('Warning: %s' % deprecation.full_message('Option "%s"' % option.name))
class Task(object):
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def __init__(self, callback: Callable, name: str, aliases: List, dependencies: Optional[List],
order_dependencies: Optional[List], action_args: Dict) -> None:
self.callback = callback
self.name = name
self.dependencies = dependencies
self.order_dependencies = order_dependencies
self.action_args = action_args
self.aliases = aliases
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def __call__(self, context: click.core.Context, global_args: PropertyDict, action_args: Dict=None) -> None:
if action_args is None:
action_args = self.action_args
self.callback(self.name, context, global_args, **action_args)
class Action(click.Command):
def __init__(
self,
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name: Optional[str]=None,
aliases: Optional[List]=None,
deprecated: Union[Dict, str, bool]=False,
dependencies: Optional[List]=None,
order_dependencies: Optional[List]=None,
hidden: bool=False,
**kwargs: Any) -> None:
super(Action, self).__init__(name, **kwargs)
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self.name: str = self.name or self.callback.__name__
self.deprecated: Union[Dict, str, bool] = deprecated
self.hidden: bool = hidden
if aliases is None:
aliases = []
self.aliases = aliases
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self.help: str = self.help or self.callback.__doc__ or ''
if dependencies is None:
dependencies = []
if order_dependencies is None:
order_dependencies = []
# Show first line of help if short help is missing
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self.short_help: str = self.short_help or self.help.split('\n')[0]
if deprecated:
deprecation = Deprecation(deprecated)
self.short_help = deprecation.short_help(self.short_help)
self.help = deprecation.help(self.help, type='Command', separator='\n')
# Add aliases to help string
if aliases:
aliases_help = 'Aliases: %s.' % ', '.join(aliases)
self.help = '\n'.join([self.help, aliases_help])
self.short_help = ' '.join([aliases_help, self.short_help])
self.unwrapped_callback = self.callback
if self.callback is not None:
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def wrapped_callback(**action_args: Any) -> Task:
return Task(
callback=self.unwrapped_callback,
name=self.name,
dependencies=dependencies,
order_dependencies=order_dependencies,
action_args=action_args,
aliases=self.aliases,
)
self.callback = wrapped_callback
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def invoke(self, ctx: click.core.Context) -> click.core.Context:
if self.deprecated:
deprecation = Deprecation(self.deprecated)
message = deprecation.full_message('Command "%s"' % self.name)
if deprecation.exit_with_error:
raise FatalError('Error: %s' % message)
else:
print_warning('Warning: %s' % message)
self.deprecated = False # disable Click's built-in deprecation handling
# Print warnings for options
check_deprecation(ctx)
return super(Action, self).invoke(ctx)
class Argument(click.Argument):
"""
Positional argument
names - alias of 'param_decls'
"""
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def __init__(self, **kwargs: str):
names = kwargs.pop('names')
super(Argument, self).__init__(names, **kwargs)
class Scope(object):
"""
Scope for sub-command option.
possible values:
- default - only available on defined level (global/action)
- global - When defined for action, also available as global
- shared - Opposite to 'global': when defined in global scope, also available for all actions
"""
SCOPES = ('default', 'global', 'shared')
def __init__(self, scope: Union['Scope', str]=None) -> None: # noqa: F821
if scope is None:
self._scope = 'default'
elif isinstance(scope, str) and scope in self.SCOPES:
self._scope = scope
elif isinstance(scope, Scope):
self._scope = str(scope)
else:
raise FatalError('Unknown scope for option: %s' % scope)
@property
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def is_global(self) -> bool:
return self._scope == 'global'
@property
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def is_shared(self) -> bool:
return self._scope == 'shared'
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def __str__(self) -> str:
return self._scope
class Option(click.Option):
"""Option that knows whether it should be global"""
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def __init__(self, scope: Union[Scope, str]=None, deprecated: Union[Dict, str, bool]=False, hidden: bool=False, **kwargs: str) -> None:
"""
Keyword arguments additional to Click's Option class:
names - alias of 'param_decls'
deprecated - marks option as deprecated. May be boolean, string (with custom deprecation message)
or dict with optional keys:
since: version of deprecation
removed: version when option will be removed
custom_message: Additional text to deprecation warning
"""
kwargs['param_decls'] = kwargs.pop('names')
super(Option, self).__init__(**kwargs)
self.deprecated = deprecated
self.scope = Scope(scope)
self.hidden = hidden
if deprecated:
deprecation = Deprecation(deprecated)
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self.help: str = deprecation.help(self.help)
if self.envvar:
self.help += ' The default value can be set with the %s environment variable.' % self.envvar
if self.scope.is_global:
self.help += ' This option can be used at most once either globally, or for one subcommand.'
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def get_help_record(self, ctx: click.core.Context) -> Any:
# Backport "hidden" parameter to click 5.0
if self.hidden:
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return None
return super(Option, self).get_help_record(ctx)
class CLI(click.MultiCommand):
"""Action list contains all actions with options available for CLI"""
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def __init__(self, all_actions: Dict=None, verbose_output: List=None, help: str=None) -> None:
super(CLI, self).__init__(
chain=True,
invoke_without_command=True,
result_callback=self.execute_tasks,
no_args_is_help=True,
context_settings={'max_content_width': 140},
help=help,
)
self._actions = {}
self.global_action_callbacks = []
self.commands_with_aliases = {}
if verbose_output is None:
verbose_output = []
self.verbose_output = verbose_output
if all_actions is None:
all_actions = {}
shared_options = []
# Global options
for option_args in all_actions.get('global_options', []):
option = Option(**option_args)
self.params.append(option)
if option.scope.is_shared:
shared_options.append(option)
# Global options validators
self.global_action_callbacks = all_actions.get('global_action_callbacks', [])
# Actions
for name, action in all_actions.get('actions', {}).items():
arguments = action.pop('arguments', [])
options = action.pop('options', [])
if arguments is None:
arguments = []
if options is None:
options = []
self._actions[name] = Action(name=name, **action)
for alias in [name] + action.get('aliases', []):
self.commands_with_aliases[alias] = name
for argument_args in arguments:
self._actions[name].params.append(Argument(**argument_args))
# Add all shared options
for option in shared_options:
self._actions[name].params.append(option)
for option_args in options:
option = Option(**option_args)
if option.scope.is_shared:
raise FatalError(
'"%s" is defined for action "%s". '
' "shared" options can be declared only on global level' % (option.name, name))
# Promote options to global if see for the first time
if option.scope.is_global and option.name not in [o.name for o in self.params]:
self.params.append(option)
self._actions[name].params.append(option)
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def list_commands(self, ctx: click.core.Context) -> List:
return sorted(filter(lambda name: not self._actions[name].hidden, self._actions))
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def get_command(self, ctx: click.core.Context, name: str) -> Optional[Action]:
if name in self.commands_with_aliases:
return self._actions.get(self.commands_with_aliases.get(name))
# Trying fallback to build target (from "all" action) if command is not known
else:
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callback = self._actions.get('fallback')
if callback:
return Action(name=name, callback=callback.unwrapped_callback)
return None
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def _print_closing_message(self, args: PropertyDict, actions: _OrderedDictKeysView) -> None:
# print a closing message of some kind
#
if any(t in str(actions) for t in ('flash', 'dfu', 'uf2', 'uf2-app')):
print('Done')
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return
if not os.path.exists(os.path.join(args.build_dir, 'flasher_args.json')):
print('Done')
return
# Otherwise, if we built any binaries print a message about
# how to flash them
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def print_flashing_message(title: str, key: str) -> None:
with open(os.path.join(args.build_dir, 'flasher_args.json')) as file:
flasher_args: Dict[str, Any] = json.load(file)
def flasher_path(f: Union[str, 'os.PathLike[str]']) -> str:
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if type(args.build_dir) is bytes:
args.build_dir = args.build_dir.decode()
return _safe_relpath(os.path.join(args.build_dir, f))
if key != 'project': # flashing a single item
if key not in flasher_args:
# This is the case for 'idf.py bootloader' if Secure Boot is on, need to follow manual flashing steps
print('\n%s build complete.' % title)
return
cmd = ''
if (key == 'bootloader'): # bootloader needs --flash-mode, etc to be passed in
cmd = ' '.join(flasher_args['write_flash_args']) + ' '
cmd += flasher_args[key]['offset'] + ' '
cmd += flasher_path(flasher_args[key]['file'])
else: # flashing the whole project
cmd = ' '.join(flasher_args['write_flash_args']) + ' '
flash_items = sorted(
((o, f) for (o, f) in flasher_args['flash_files'].items() if len(o) > 0),
key=lambda x: int(x[0], 0),
)
for o, f in flash_items:
cmd += o + ' ' + flasher_path(f) + ' '
flash_target = 'flash' if key == 'project' else f'{key}-flash'
print(f'{os.linesep}{title} build complete. To flash, run:')
print(f' idf.py {flash_target}')
if args.port:
print('or')
print(f' idf.py -p {args.port} {flash_target}')
print('or')
print(f' idf.py -p PORT {flash_target}')
esptool_cmd = ['python -m esptool',
'--chip {}'.format(flasher_args['extra_esptool_args']['chip']),
f'-b {args.baud}',
'--before {}'.format(flasher_args['extra_esptool_args']['before']),
'--after {}'.format(flasher_args['extra_esptool_args']['after'])]
if not flasher_args['extra_esptool_args']['stub']:
esptool_cmd += ['--no-stub']
if args.port:
esptool_cmd += [f'-p {args.port}']
esptool_cmd += ['write_flash']
print('or')
print(' {}'.format(' '.join(esptool_cmd + [cmd.strip()])))
if os.path.exists(os.path.join(args.build_dir, 'flash_args')):
print(f'or from the "{args.build_dir}" directory')
print(' {}'.format(' '.join(esptool_cmd + ['"@flash_args"'])))
if 'all' in actions or 'build' in actions:
print_flashing_message('Project', 'project')
else:
if 'app' in actions:
print_flashing_message('App', 'app')
if 'partition-table' in actions:
print_flashing_message('Partition Table', 'partition-table')
if 'bootloader' in actions:
print_flashing_message('Bootloader', 'bootloader')
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def execute_tasks(self, tasks: List, **kwargs: str) -> OrderedDict:
ctx = click.get_current_context()
global_args = PropertyDict(kwargs)
# Show warning if some tasks are present several times in the list
dupplicated_tasks = sorted(
[item for item, count in Counter(task.name for task in tasks).items() if count > 1])
if dupplicated_tasks:
dupes = ', '.join('"%s"' % t for t in dupplicated_tasks)
print_warning(
'WARNING: Command%s found in the list of commands more than once. ' %
('s %s are' % dupes if len(dupplicated_tasks) > 1 else ' %s is' % dupes) +
'Only first occurrence will be executed.')
for task in tasks:
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# Set propagated global options.
# These options may be set on one subcommand, but available in the list of global arguments
for key in list(task.action_args):
option = next((o for o in ctx.command.params if o.name == key), None)
if option and (option.scope.is_global or option.scope.is_shared):
local_value = task.action_args.pop(key)
global_value = global_args[key]
default = () if option.multiple else option.default
if global_value != default and local_value != default and global_value != local_value:
if hasattr(option, 'envvar') and option.envvar and os.getenv(option.envvar) != default:
msg = (f'This option cannot be set in command line if the {option.envvar} '
'environment variable is set to a different value.')
else:
msg = 'This option can appear at most once in the command line.'
raise FatalError(f'Option "{key}" provided for "{task.name}" is already defined to '
f'a different value. {msg}')
if local_value != default:
global_args[key] = local_value
# Show warnings about global arguments
check_deprecation(ctx)
# Make sure that define_cache_entry is mutable list and can be modified in callbacks
global_args.define_cache_entry = list(global_args.define_cache_entry)
# Execute all global action callback - first from idf.py itself, then from extensions
for action_callback in ctx.command.global_action_callbacks:
action_callback(ctx, global_args, tasks)
# Build full list of tasks to and deal with dependencies and order dependencies
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tasks_to_run: OrderedDict = OrderedDict()
while tasks:
task = tasks[0]
tasks_dict = dict([(t.name, t) for t in tasks])
dependecies_processed = True
# If task have some dependecies they have to be executed before the task.
for dep in task.dependencies:
if dep not in tasks_to_run.keys():
# If dependent task is in the list of unprocessed tasks move to the front of the list
if dep in tasks_dict.keys():
dep_task = tasks.pop(tasks.index(tasks_dict[dep]))
# Otherwise invoke it with default set of options
# and put to the front of the list of unprocessed tasks
else:
print(
'Adding "%s"\'s dependency "%s" to list of commands with default set of options.' %
(task.name, dep))
dep_task = ctx.invoke(ctx.command.get_command(ctx, dep))
# Remove options with global scope from invoke tasks because they are already in global_args
for key in list(dep_task.action_args):
option = next((o for o in ctx.command.params if o.name == key), None)
if option and (option.scope.is_global or option.scope.is_shared):
dep_task.action_args.pop(key)
tasks.insert(0, dep_task)
dependecies_processed = False
# Order only dependencies are moved to the front of the queue if they present in command list
for dep in task.order_dependencies:
if dep in tasks_dict.keys() and dep not in tasks_to_run.keys():
tasks.insert(0, tasks.pop(tasks.index(tasks_dict[dep])))
dependecies_processed = False
if dependecies_processed:
# Remove task from list of unprocessed tasks
tasks.pop(0)
# And add to the queue
if task.name not in tasks_to_run.keys():
tasks_to_run.update([(task.name, task)])
# Run all tasks in the queue
# when global_args.dry_run is true idf.py works in idle mode and skips actual task execution
if not global_args.dry_run:
for task in tasks_to_run.values():
name_with_aliases = task.name
if task.aliases:
name_with_aliases += ' (aliases: %s)' % ', '.join(task.aliases)
# When machine-readable json format for help is printed, don't show info about executing action so the output is deserializable
if name_with_aliases != 'help' or not task.action_args.get('json_option', False):
print('Executing action: %s' % name_with_aliases)
task(ctx, global_args, task.action_args)
self._print_closing_message(global_args, tasks_to_run.keys())
return tasks_to_run
# That's a tiny parser that parse project-dir even before constructing
# fully featured click parser to be sure that extensions are loaded from the right place
@click.command(
add_help_option=False,
context_settings={
'allow_extra_args': True,
'ignore_unknown_options': True
},
)
@click.option('-C', '--project-dir', default=os.getcwd(), type=click.Path())
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def parse_project_dir(project_dir: str) -> Any:
return os.path.realpath(project_dir)
# Set `complete_var` to not existing environment variable name to prevent early cmd completion
project_dir = parse_project_dir(standalone_mode=False, complete_var='_IDF.PY_COMPLETE_NOT_EXISTING')
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all_actions: Dict = {}
# Load extensions from components dir
idf_py_extensions_path = os.path.join(os.environ['IDF_PATH'], 'tools', 'idf_py_actions')
extension_dirs = [os.path.realpath(idf_py_extensions_path)]
extra_paths = os.environ.get('IDF_EXTRA_ACTIONS_PATH')
if extra_paths is not None:
for path in extra_paths.split(';'):
path = os.path.realpath(path)
if path not in extension_dirs:
extension_dirs.append(path)
extensions = []
for directory in extension_dirs:
if directory and not os.path.exists(directory):
print_warning('WARNING: Directory with idf.py extensions doesn\'t exist:\n %s' % directory)
continue
sys.path.append(directory)
for _finder, name, _ispkg in sorted(iter_modules([directory])):
if name.endswith('_ext'):
extensions.append((name, import_module(name)))
# Load component manager idf.py extensions if not explicitly disabled
if os.getenv('IDF_COMPONENT_MANAGER') != '0':
extensions.append(('component_manager_ext', idf_extensions))
# Optional load `pyclang` for additional clang-tidy related functionalities
try:
from pyclang import idf_extension
extensions.append(('idf_clang_tidy_ext', idf_extension))
except ImportError:
pass
for name, extension in extensions:
try:
all_actions = merge_action_lists(all_actions, extension.action_extensions(all_actions, project_dir))
except AttributeError:
print_warning('WARNING: Cannot load idf.py extension "%s"' % name)
# Load extensions from project dir
if os.path.exists(os.path.join(project_dir, 'idf_ext.py')):
sys.path.append(project_dir)
try:
from idf_ext import action_extensions
except ImportError:
print_warning('Error importing extension file idf_ext.py. Skipping.')
print_warning(
"Please make sure that it contains implementation (even if it's empty) of add_action_extensions")
try:
all_actions = merge_action_lists(all_actions, action_extensions(all_actions, project_dir))
except NameError:
pass
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cli_help = (
'ESP-IDF CLI build management tool. '
'For commands that are not known to idf.py an attempt to execute it as a build system target will be made. '
'Selected target: {}'.format(get_target(project_dir)))
return CLI(help=cli_help, verbose_output=verbose_output, all_actions=all_actions)
def main(argv: List[Any] = None) -> None:
# Check the environment only when idf.py is invoked regularly from command line.
checks_output = None if SHELL_COMPLETE_RUN else check_environment()
# Check existance of the current working directory to prevent exceptions from click cli.
try:
os.getcwd()
except FileNotFoundError as e:
raise FatalError(f'ERROR: {e}. Working directory cannot be established. Check its existence.')
try:
cli = init_cli(verbose_output=checks_output)
except ImportError:
if SHELL_COMPLETE_RUN:
pass
else:
raise
else:
argv = expand_file_arguments(argv or sys.argv[1:])
cli(argv, prog_name=PROG, complete_var=SHELL_COMPLETE_VAR)
def expand_file_arguments(argv: List[Any]) -> List[Any]:
"""
Any argument starting with "@" gets replaced with all values read from a text file.
Text file arguments can be split by newline or by space.
Values are added "as-is", as if they were specified in this order
on the command line.
"""
visited = set()
expanded = False
def expand_args(args: List[Any], parent_path: str, file_stack: List[str]) -> List[str]:
expanded_args = []
for arg in args:
if not arg.startswith('@'):
expanded_args.append(arg)
else:
nonlocal expanded, visited
expanded = True
file_name = arg[1:]
rel_path = os.path.normpath(os.path.join(parent_path, file_name))
if rel_path in visited:
file_stack_str = ' -> '.join(['@' + f for f in file_stack + [file_name]])
raise FatalError(f'Circular dependency in file argument expansion: {file_stack_str}')
visited.add(rel_path)
try:
with open(rel_path, 'r') as f:
for line in f:
expanded_args.extend(expand_args(shlex.split(line), os.path.dirname(rel_path), file_stack + [file_name]))
except IOError:
file_stack_str = ' -> '.join(['@' + f for f in file_stack + [file_name]])
raise FatalError(f"File '{rel_path}' (expansion of {file_stack_str}) could not be opened. "
'Please ensure the file exists and you have the necessary permissions to read it.')
return expanded_args
argv = expand_args(argv, os.getcwd(), [])
if expanded:
print(f'Running: idf.py {" ".join(argv)}')
return argv
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def _valid_unicode_config() -> Union[codecs.CodecInfo, bool]:
# Python 2 is always good
if sys.version_info[0] == 2:
return True
# With python 3 unicode environment is required
try:
return codecs.lookup(locale.getpreferredencoding()).name != 'ascii'
except Exception:
return False
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def _find_usable_locale() -> str:
try:
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locales = subprocess.Popen(['locale', '-a'], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()[0].decode('ascii', 'replace')
except OSError:
locales = ''
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usable_locales: List[str] = []
for line in locales.splitlines():
locale = line.strip()
locale_name = locale.lower().replace('-', '')
# C.UTF-8 is the best option, if supported
if locale_name == 'c.utf8':
return locale
if locale_name.endswith('.utf8'):
# Make a preference of english locales
if locale.startswith('en_'):
usable_locales.insert(0, locale)
else:
usable_locales.append(locale)
if not usable_locales:
raise FatalError(
'Support for Unicode filenames is required, but no suitable UTF-8 locale was found on your system.'
' Please refer to the manual for your operating system for details on locale reconfiguration.')
return usable_locales[0]
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if __name__ == '__main__':
try:
if 'MSYSTEM' in os.environ:
print_warning(
'MSys/Mingw is no longer supported. Please follow the getting started guide of the '
'documentation in order to set up a suitiable environment, or continue at your own risk.')
elif os.name == 'posix' and not _valid_unicode_config():
# Trying to find best utf-8 locale available on the system and restart python with it
best_locale = _find_usable_locale()
print_warning(
'Your environment is not configured to handle unicode filenames outside of ASCII range.'
' Environment variable LC_ALL is temporary set to %s for unicode support.' % best_locale)
os.environ['LC_ALL'] = best_locale
ret = subprocess.call([sys.executable] + sys.argv, env=os.environ)
if ret:
raise SystemExit(ret)
else:
main()
except FatalError as e:
print(e, file=sys.stderr)
sys.exit(2)