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pip/news/5366.bugfix

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Fix a rare segfault If pip10 is installed and pyopenssl+cryptography are present in the environment pip's vendored urllib3 will automatically activate its pyopenssl adapter. This is by design so users can potentially opt-in to more up-to-date TLS versions than what are provided by their copy of Python. However, if a user has these packages & subsequently runs pip install --ignore-installed cryptography then a segfault will occur due to overwriting an mmap'd shared object.
2018-05-14 19:13:35 +02:00
Check for file existence and unlink first when clobbering existing files during a wheel install.