symbolicmode 0.3

Code to handle symbolic permissions like GNU chmod does ('a=rx,u+w')

SymbolicMode -- Code to handle symbolic file permissions

This python library parses symbolic file permission modes as used by GNU chmod, part of the coreutils package. For example:

>>> from symbolicmode import *
>>> oct(symbolic_to_numeric_permissions('a=rx,u+w'))
'0o755'   

Status

This library is fully compatible with GNU Coreutils 8.32-4.1ubuntu1, the version on my system which I have extensively tested using fuzz testing, with the following exceptions:

• It does not yet implement the "umask" based permissions setting (when no user portion is specified on the left hand side of the operator, for example "=rx").
• It does not yet implement the "ugo" permissions (when a "ugo" appears on the right hand side of the operator, for example "go=u").

Fuzz Testing

In the "fuzzchmod" directory is a set of programs for fuzz testing SymbolicMode against the system "chmod" to try to ensure correctness for even unusual inputs.

License

CC0 1.0 Universal, see LICENSE file for more information.