Recurring travis fail no such option 'with-pylons'

[vitorbaptista]

For example in https://travis-ci.org/okfn/ckan/jobs/6243730

[formatter_generic]
format = %(asctime)s %(levelname)-5.5s [%(name)s] %(message)s
/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/plugins/manager.py:395: RuntimeWarning: Unable to load plugin main = ckan.ckan_nose_plugin:CkanNose: No module named paste.deploy
  RuntimeWarning)
Traceback (most recent call last):
  File "/home/travis/virtualenv/python2.7/bin/nosetests", line 9, in <module>
    load_entry_point('nose==1.2.1', 'console_scripts', 'nosetests')()
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/core.py", line 118, in __init__
    **extra_args)
  File "/usr/lib/python2.7/unittest/main.py", line 94, in __init__
    self.parseArgs(argv)
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/core.py", line 135, in parseArgs
    self.config.configure(argv, doc=self.usage())
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/config.py", line 276, in configure
    options, args = self._parseArgs(argv, cfg_files)
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/config.py", line 264, in _parseArgs
    return parser.parseArgsAndConfigFiles(argv[1:], cfg_files)
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/config.py", line 132, in parseArgsAndConfigFiles
    self._applyConfigurationToValues(self._parser, config, values)
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/config.py", line 118, in _applyConfigurationToValues
    name=name, filename=filename)
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/config.py", line 261, in warn_sometimes
    raise ConfigError(msg)
nose.config.ConfigError: Error reading config file 'setup.cfg': no such option 'with-pylons'

[tobes]

This is due to pip-install failing like so

HTTP error 503 while getting https://pypi.python.org/packages/source/S/SQLAlchemy/SQLAlchemy-

We could catch this error and try again. In most instances this would fix the problem. It might be worth sleeping a short while and limiting the number of retries. This is hard to test :( but seems like it would fix the problem.

[nigelbabu]

I wonder if it would help to add a second pip install line. If everything worked fine, that should be fine to do and would give a second chance in case something didn't work fine.

[vitorbaptista]

I've asked in #travis, and opened an issue to try to find the best option to solve this in travis-ci/travis-ci#1521.

[vitorbaptista]

I've split up Travis' installing dependencies and running tests into two files. With these patches, Travis will fail as soon as we get some error installing deps, and won't try to run the tests.

This solves this issue.

[vitorbaptista]

@domoritz @nigelbabu Whenever you have some time, please review/merge this.

[domoritz]

I might be wrong but I think there is an option to tell shell scripts to return if one line returns an exit code other than 0.

[vitorbaptista]

Yep, that's what the set -e in the beginning of bin/travis-install-dependencies is for.

[domoritz]

Cool, I tried to google it but couldn't find anything. Looks good to me.

[vitorbaptista]

Yeah, I didn't even know that it existed, until @henrikhodne told me in travis-ci/travis-ci#1521. May you merge it, then? :-)

[vitorbaptista]

@domoritz ping

[vitorbaptista]

👍