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  • Manuel Jacob's avatar
    setup: require that Python has TLS 1.1 or TLS 1.2 · 95c832849955
    Manuel Jacob authored
    This ensures that Mercurial never downgrades the minimum TLS version from
    TLS 1.1+ to TLS 1.0+ and enables us to remove that compatibility code.
    
    It is reasonable to expect that distributions having Python 2.7.9+ or having
    backported modern features to the ssl module (which we require) have a OpenSSL
    version supporting TLS 1.1 or TLS 1.2, as this is the main reason why
    distributions would want to backport these features.
    
    TLS 1.1 and TLS 1.2 are often either both enabled or both not enabled.
    However, both can be disabled independently, at least on current Python /
    OpenSSL versions.
    
    For the record, I contacted the CPython developers to remark that
    unconditionally defining ssl.PROTOCOL_TLSv1_1 / ssl.PROTOCOL_TLSv1_2 is
    problematic:
    https://github.com/python/cpython/commit/6e8cda91d92da72800d891b2fc2073ecbc134d98#r39569316
    95c832849955