Description of problem:

certbot fails to run. It introduces itself on CentOS 7.4. Supposedly since python version is not compatible with python2-josepy, or possibly some other package.

How reproducible: always

Steps to Reproduce:

1. certbot certonly --standalone -d example.com

Actual results:

Traceback (most recent call last): 
  File "/usr/bin/certbot", line 9, in <module> 
    load_entry_point('certbot==0.23.0', 'console_scripts', 'certbot')()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 378, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2566, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2260, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/usr/lib/python2.7/site-packages/certbot/main.py", line 10, in <module>
    import josepy as jose
  File "/usr/lib/python2.7/site-packages/josepy/__init__.py", line 44, in <module>
    from josepy.interfaces import JSONDeSerializable
  File "/usr/lib/python2.7/site-packages/josepy/interfaces.py", line 14, in <module>
    @six.add_metaclass(abc.ABCMeta)
AttributeError: 'module' object has no attribute 'add_metaclass'

Expected results:

doesn't trigger the error

Additional info:

Another way to reproduce:

$ python -c 'import josepy'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/josepy/__init__.py", line 44, in <module>
    from josepy.interfaces import JSONDeSerializable
  File "/usr/lib/python2.7/site-packages/josepy/interfaces.py", line 14, in <module>
    @six.add_metaclass(abc.ABCMeta)
AttributeError: 'module' object has no attribute 'add_metaclass'

$ yum list python python2-josepy
...
Installed Packages
python.x86_64                                    2.7.5-68.el7                             @base
python2-josepy.noarch                            1.1.0-1.el7                              @epel

I can't reproduce it on CentOS 7.2:

$ yum list python python2-josepy
...

Installed Packages
python.x86_64                                    2.7.5-34.el7                             @base
python2-josepy.noarch                            1.1.0-1.el7                              @epel
Available Packages
python.x86_64                                    2.7.5-58.el7                             base 

The workaround is to use https://dl.eff.org/certbot-auto

certbot-auto installs the following versions of packages:

$ /opt/eff.org/certbot/venv/bin/pip freeze
acme==0.24.0
asn1crypto==0.22.0
certbot==0.24.0
certbot-apache==0.24.0
certbot-nginx==0.24.0
cffi==1.10.0
ConfigArgParse==0.12.0
configobj==5.0.6
cryptography==2.0.2
enum34==1.1.2
funcsigs==1.0.2
idna==2.5
ipaddress==1.0.16
josepy==1.0.1
letsencrypt==0.7.0
linecache2==1.0.0
mock==1.3.0
ordereddict==1.1
packaging==16.8
parsedatetime==2.1
pbr==1.8.1
pycparser==2.14
pyOpenSSL==16.2.0
pyparsing==2.1.8
pyRFC3339==1.0
python-augeas==0.5.0
pytz==2015.7
requests==2.12.1
six==1.10.0
traceback2==1.4.0
unittest2==1.1.0
zope.component==4.2.2
zope.event==4.1.0
zope.interface==4.1.3