pew Failing To Enter Virtual Environment

Attempt to enter newly-created or existing virt environment blows out on some of our systems - so far seen on one FreeBSD 10-STABLE VPS and one CentOS VPS. It seems fine on FreeBSD-Stable on physical machines, Linux Mint 17/Physical, and CentOS7/VPS. Details:

~>pew workon foo
Traceback (most recent call last):
  File "/usr/local/bin/pew", line 11, in <module>
    sys.exit(pew())
  File "/usr/local/lib/python2.7/site-packages/pew/pew.py", line 738, in pew
    return command(sys.argv[2:])
  File "/usr/local/lib/python2.7/site-packages/pew/pew.py", line 355, in workon_cmd
    shell(env, cwd=project_dir)
  File "/usr/local/lib/python2.7/site-packages/pew/pew.py", line 200, in shell
    fork_bash(env, cwd)
  File "/usr/local/lib/python2.7/site-packages/pew/pew.py", line 157, in fork_bash
    with NamedTemporaryFile('w+') as rcfile:
  File "/usr/local/lib/python2.7/site-packages/pew/_utils.py", line 27, in NamedTemporaryFile
    return getwriter(encoding)(_ntf(mode))
  File "/usr/local/lib/python2.7/codecs.py", line 1009, in getwriter
    return lookup(encoding).streamwriter
TypeError: lookup() argument 1 must be string, not None

[berdario]

Good, but why “automatically set locale environment” sets it as C (which only allows ASCII)?

I guess that at the very least I should provide a better error message

[tundratim]

This was just to prove that the fix worked.