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Pex can now support multiple Pip versions and be configured to fallback as needed when newer Pip does not support a specified interpreter. Fixes pex-tool#1805
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Original file line number | Diff line number | Diff line change |
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# Copyright 2022 Pants project contributors (see CONTRIBUTORS.md). | ||
# Licensed under the Apache License, Version 2.0 (see LICENSE). | ||
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||
from __future__ import absolute_import | ||
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||
from pex.pip.installation import compatible_version, validate_targets | ||
from pex.pip.version import PipVersionValue | ||
from pex.resolve.resolver_configuration import ( | ||
LockRepositoryConfiguration, | ||
PexRepositoryConfiguration, | ||
PipConfiguration, | ||
) | ||
from pex.result import Error, catch, try_ | ||
from pex.targets import Targets | ||
from pex.typing import TYPE_CHECKING, cast | ||
|
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if TYPE_CHECKING: | ||
from typing import Optional, TypeVar, Union | ||
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import attr # vendor:skip | ||
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Configuration = Union[LockRepositoryConfiguration, PexRepositoryConfiguration, PipConfiguration] | ||
_C = TypeVar("_C", bound=Configuration) | ||
|
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else: | ||
from pex.third_party import attr | ||
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||
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def _finalize_pip_configuration( | ||
pip_configuration, # type: PipConfiguration | ||
targets, # type: Targets | ||
context, # type: str | ||
pip_version=None, # type: Optional[PipVersionValue] | ||
): | ||
# type: (...) -> Union[PipConfiguration, Error] | ||
version = pip_version or pip_configuration.version | ||
if pip_configuration.allow_version_fallback: | ||
return attr.evolve(pip_configuration, version=compatible_version(targets, version, context)) | ||
|
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result = catch(validate_targets, targets, version, context) | ||
if isinstance(result, Error): | ||
return result | ||
return attr.evolve(pip_configuration, version=version) | ||
|
||
|
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def finalize( | ||
resolver_configuration, # type: _C | ||
targets, # type: Targets | ||
context, # type: str | ||
pip_version=None, # type: Optional[PipVersionValue] | ||
): | ||
# type: (...) -> Union[_C, Error] | ||
|
||
if isinstance(resolver_configuration, PipConfiguration): | ||
return cast( | ||
"_C", | ||
_finalize_pip_configuration( | ||
resolver_configuration, targets, context, pip_version=pip_version | ||
), | ||
) | ||
|
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if isinstance(resolver_configuration, LockRepositoryConfiguration): | ||
lock_file = try_(resolver_configuration.parse_lock()) | ||
pip_configuration = try_( | ||
_finalize_pip_configuration( | ||
resolver_configuration.pip_configuration, | ||
targets, | ||
context, | ||
pip_version=pip_version or lock_file.pip_version, | ||
) | ||
) | ||
return cast( | ||
"_C", | ||
attr.evolve( | ||
resolver_configuration, | ||
parse_lock=lambda: lock_file, | ||
pip_configuration=pip_configuration, | ||
), | ||
) | ||
|
||
return resolver_configuration |
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