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This module implements logic to detect if the currently running Python is
linked against musl, and what musl version is used.
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|v�r\ dS | S dS )z�Detect musl libc location by parsing the Python executable.
Based on: https://gist.github.com/lyssdod/f51579ae8d93c8657a5564aefc2ffbca
ELF header: https://refspecs.linuxfoundation.org/elf/gabi4+/ch4.eheader.html
r Z16BN� s ELFZHHI� )ZIIIIHHHZIIIIIIII)r r r )ZQQQIHHHZIIQQQQQQ)r � � )r r � � �musl)�seekr r �error�tupler �KeyError�operator�
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r& c @ s e Zd ZU eed< eed< dS )� _MuslVersion�major�minorN)�__name__�
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)r" r0 r r r � <genexpr>M r4 z&_parse_musl_version.<locals>.<genexpr>r r r r zVersion (\d+)\.(\d+)r )r( r) )�
splitlines�len�re�matchr' r- �group)r/ �lines�mr r r �_parse_musl_versionL s r= )�
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�S )a` Detect currently-running musl runtime version.
This is done by checking the specified executable's dynamic linking
information, and invoking the loader to parse its output for a version
string. If the loader is musl, the output would be something like::
musl libc (x86_64)
Version 1.2.2
Dynamic Program Loader
�rbNT)�stderrZuniversal_newlines) �
contextlib� ExitStack�
enter_context�open�OSErrorr& �
subprocess�run�PIPEr= r@ )r> �stackr Zld�procr r r �_get_musl_versionV s
&rK )�archr c c sH t tj�}|du rdS t|jdd�D ] }d|j� d|� d| � �V q$dS )aT Generate musllinux tags compatible to the current platform.
:param arch: Should be the part of platform tag after the ``linux_``
prefix, e.g. ``x86_64``. The ``linux_`` prefix is assumed as a
prerequisite for the current platform to be musllinux-compatible.
:returns: An iterator of compatible musllinux tags.
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musllinux_r$ )rK �sysr> r r) r( )rL Zsys_muslr) r r r �
platform_tagsn s
rO �__main__zlinux-z not linuxzplat:zmusl:ztags:� )�endz[.-]r$ �-r rM z
)#�__doc__rA � functoolsr r r8 r rF rN �typingr r r r r �bytes�strr- r r& r' r= � lru_cacherK rO r* Z sysconfigZ get_platformZplat�
startswith�printr> �sub�split�tr r r r �<module> s2 1
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