pybridge doesn't start

[Stefan Istrate]

Binary package hint: pybridge

When launching pybridge, I am getting the following message: "Error: Twisted Core 2.0.0+ required". I have installed python-twisted and python-twisted-core but pybridge still doesn't work. I am using Ubuntu Lucid.

[Bartek Wilczynski (bartek)]

Confirmed. Pybridge client need twisted 2.5, while lucid installs 10.0.0.

[Stefan Istrate (stefan-istrate-deactivatedaccount)]

Here is the problem:

if twisted.copyright.version < TWISTED_REQUIRED:
        raise SystemExit, "Error: Twisted Core %s+ required" % TWISTED_REQUIRED

'10.0.0' is less than '2.0.0'.

[Bartek Wilczynski (bartek)]

Indeed, this patch for /usr/games/pybridge does the trick:
32c32
< TWISTED_REQUIRED = '10.0.0'
---
> TWISTED_REQUIRED = '2.0.0'

[Michael Banks (michaelbanks)]

Stefan is correct: the string comparison assumes the first character of twisted.copyright.version to be in range '2'..'9'. (In my defence, Twisted was at version 2.x when I wrote that code.)

A quick fix is to comment out the following lines of /usr/games/pybridge (lines 48-50):

# import twisted.copyright
# if twisted.copyright.version < TWISTED_REQUIRED:
# raise SystemExit, "Error: Twisted Core %s+ required" % TWISTED_REQUIRED

For the PyBridge packages in Debian/Ubuntu, the version checking performed by /usr/games/pybridge (lines 27- 67) is unnecessary, since the dependency data is embedded into the .deb files.

[RazTaz (qvovadis)]

I confirm the bug. I'm using Ubuntu 10.04, Kernel Linux 2.6.32-27-generic-pae.

[LarryE (cppljevans)]

See:

  https://stackoverflow.com/questions/11887762/compare-version-strings-in-python

If you do as that suggested by replacing the comparison with:

  StrictVersion(twisted.copyright.version) < StrictVersion(TWiSTED_REQUIRED)

I think it'll work.