Redo "Parse env configuration in posix mode"

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Redo "Parse env configuration in posix mode" #1613

Open vereszol opened 7 months ago

vereszol commented 7 months ago

Fixes #328

This allows (escaped) quotes in the values as well as empty values.

This was done in pull request #329 but removed as it broke parsing empty quotes (#873) due to a bug in shlex (http://bugs.python.org/issue21999). This bug is fixed so posix mode can be used.

Brings back #329 Partially reverts #880

vereszol commented 7 months ago

https://bugs.python.org/issue21999 was fixed in Python 2.7 and 3.5 so this can be merged only after dropping support for Python 3.4