Replace fcrypt dependency with passlib

[Ryan J Ollos]

Trac has a dependency on fcrypt when running on non-Unix platforms.

$grep -R "fcrypt" . --exclude-dir=".git" --exclude-dir=".svn" --exclude=*.pyc --exclude-dir=build --exclude-dir=doc
./contrib/htpasswd.py:             "fcrypt from PyPI.", newline=True)
./trac/util/compat.py:        from fcrypt import crypt
./trac/wiki/default-pages/TracStandalone:  Note: It is necessary (at least with Python 2.6) to install the fcrypt package in order to

• tags/trac-1.1.6/trac/util/compat.py@:26-33#L16​
• tags/trac-1.1.6/contrib/htpasswd.py@:24-26#L16​

It appears the fcrypt library is unmaintained, and it can no longer be installed from PyPI:

$pip install fcrypt
You are using pip version 6.0.8, however version 7.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Collecting fcrypt
  Could not find any downloads that satisfy the requirement fcrypt
  Some externally hosted files were ignored as access to them may be unreliable (use --allow-external fcrypt to allow).
  No distributions at all found for fcrypt

I'd like to consider whether we should replace fcrypt with ​passlib. This was suggested in ​gmessage:trac-users:VhovR3jNRMg/XyLm7PDFBgAJ.

[Ryan J Ollos]

passlib.hashlib.des_crypt appears to give the same results as crypt.

On Unix (Mac OSX):

>>> from passlib.hash import des_crypt
>>> des_crypt.encrypt('abcdefghijklmnopqrstuvwxyz', salt='01')
'01Hifx8xXNsuc'
>>> from crypt import crypt
>>> crypt('abcdefghijklmnopqrstuvwxyz', '01')
'01Hifx8xXNsuc'

On Windows:

>>> from passlib.hash import des_crypt
>>> from fcrypt import crypt
>>> crypt('abcdefghijklmnopqrstuvwxyz', '01')
'01Hifx8xXNsuc'
>>> des_crypt.encrypt('abcdefghijklmnopqrstuvwxyz', salt='01')
'01Hifx8xXNsuc'

The main advantage I see to replacing fcrypt with passlib is that the latter is maintained, and available on PyPI. Also, ​AccountManagerPlugin is using passlib and the library may be useful as we add more AccountManager features to Trac.

[Ryan J Ollos]

Proposed changes in log:rjollos.git:t12239_passlib. Tests passing on Windows 7 with Python 2.7.11.

• DONE Update TracDev/FunctionalTests ⇒ TracDev/FunctionalTests@18
• DONE Update 1.1/TracStandalone ⇒ 1.1/TracStandalone@2

[Ryan J Ollos]

DONE Update AppVeyor build configuration (1.2dev builds fine with passlib, e.g. ​2.6, ​2.7)

[Ryan J Ollos]

Committed to trunk in [14464].

[Ryan J Ollos]

Additional documentation edits:

• TracDev/ApiChanges/1.1@7
• TracDev/ApiChanges/1.3@14