[SOLVED] Changing mode / group of WSGIServer socket in Python 2.7.x

Turbocapitalist · 07-16-2017, 05:23 AM

I am quite unfamiliar with Python. Using Python 2.7.x, I have the following line which creates a socket:

Code:

WSGIServer(application,bindAddress="/var/www/run/sockets/moinmoin.sock").run()

I have looked at the online documentation for WSGIServer 1.3 but it does not seem to have its own way of changing the group and mode of the sockets it creates.

How can I change the group + permissions of a socket at the moment it is created? Or, failing that, how can those changes be done from within Python in any other way?

audriusk · 07-16-2017, 05:40 AM

Where is that line of code you pasted coming from? I'm asking because WSGIServer class from the package that you linked to doesn't support bindAddress keyword argument, here's what I get when I try to run simple WSGI app using it:

Code:

Traceback (most recent call last):
  File "/tmp/foo.py", line 9, in <module>
    WSGIServer(application, bindAddress='/tmp/moinmoin.sock').run()
TypeError: __init__() got an unexpected keyword argument 'bindAddress'

This can only mean that WSGIServer class in your code is unrelated to the package you linked to and comes from another codebase.

Turbocapitalist · 07-16-2017, 05:44 AM

It's coming from the script moin.fcgi in moinmoin-1.9.8

The original line stood like this:

Code:

WSGIServer(application).run()

However, what I have in the original post works (for me at least) to specify the name of the socket to be used.

audriusk · 07-16-2017, 06:22 AM

MoinMoin uses flup library for FCGI, its WSGIServer class accepts umask keyword argument, so you can use that to set required permissions:

Code:

# Prepend number with zero to treat it as an octal.
WSGIServer(application, bindAddress="/var/www/run/sockets/moinmoin.sock", umask=0077).run()

Regarding socket group, you could use os.chown() for that, but it must be called before WSGIServer().run() is called, because run() method won't terminate (it will listen to the socket forever unless interrupted) and the socket file itself is not created before run() method is called, so it's a bit of a chicken-and-egg problem. Of course, you could change socket group from another process.