Unable to run tox tests, install_command error

[Dane Fichter]

I'm starting from a new install of Ubuntu 14.04, I'm able to run tests via the ./run_tests.sh script, but am unable to run the tests via tox. Whenever I attempt to, I get the following error:

Traceback (most recent call last):
  File "/usr/bin/tox", line 9, in <module>
    load_entry_point('tox==1.6.0', 'console_scripts', 'tox')()
  File "/usr/lib/python2.7/dist-packages/tox/_cmdline.py", line 25, in main
    config = parseconfig(args, 'tox')
  File "/usr/lib/python2.7/dist-packages/tox/_config.py", line 44, in parseconfig
    parseini(config, inipath)
  File "/usr/lib/python2.7/dist-packages/tox/_config.py", line 236, in __init__
    config)
  File "/usr/lib/python2.7/dist-packages/tox/_config.py", line 335, in _makeenvconfig
    "'install_command' must contain '{packages}' substitution")
tox.ConfigError: ConfigError: 'install_command' must contain '{packages}' substitution

I believe it's an error in tox.ini, but after checking on IRC, I don't see anyone else experiencing the same error.

[Bathri Ajay Raj (bathri-s)]

Hi Dane, please try it by updating the tox version. Current tox version is 2.3.1 and I believe you are using 1.6.0. Also try running tox after updating your pbr to the latest version.

[Dane Fichter (dane-fichter)]

Thanks for your help Bathri.

For others who hit this issue; upgrading the tox install via the usual routes (sudo pip install --upgrade tox or sudo apt-get update python-tox) didn't work. Both of these options failed to remove tox 1.6.0 because it is "owned by the OS". I resolved this by manually removing tox 1.6.0 (sudo rm -rf /usr/lib/python2.7/dist-packages/tox-1.6.0.egg-info/), then uninstalling via both pip AND the debian package manager, and then reinstalling with both the debian package manager and pip.

[Cyril Roelandt (cyril-roelandt)]

Should we mark this as "invalid", then?

[Dane Fichter (dane-fichter)]

Done.