charm creation and charmhelpers

[Cory Johns]

Thierry,

In the current template, charmhelpers is installed using pip, and the
path you mentioned is the system package path for Python 2.7, so it
should be on the path by default.  I just created a new charm using
the template and confirmed that it was able to import charmhelpers
from that location.

Are you by chance modifying the files generated by the template to use
Python 3 instead of Python 2.7?  If so, you will also need to change
hooks/setup.py to install and use pip3 (python3-pip) instead.

Alternatively, if you are making any changes to the path in your
charm, you should be careful to include
/usr/local/lib/python2.7/dist-packages, as that is where any
system-level Python libraries will be installed (again, only for
Python 2.7, not Python 3).

Also note that if you are using a virtualenv, you would need to delay
calling setup.pre_install() until after the virtualenv is created and
activated, so that charmhelpers would be installed into the
virtualenv.  (You could also then remove the `apt-get install
python-pip`, since mkvirtualenv installs pip for you.)

Note that it was decided that the framework is still not widely
accepted or understood enough to be the default template, so the next
version of Charm Tools will change or remove the default selection for
the template, which will affect this, as well.

On Thu, Feb 26, 2015 at 3:46 AM, Thierry Fauck at linux.vnet.ibm.com
<thierry at linux.vnet.ibm.com> wrote:
> Hello charm developpers,
>
> Creating a new charm python template now integrates load of charmhelpers
> package (setup.py script) which is good.
> Then template for start/stop script do call service.py for service
> management.
> The problem I saw is that charmhelpers package is installed in
> /usr/local/lib/python2.7/dist-packages/charmhelpers and that path is not
> integrated by default in the search path.
> Is this a bug or should we had a
> sys.path.append('/usr/local/lib/python2.7/dist-packages/') in service.py
> script ?
>
> Let me know if there is anything you want me to do for that
> Thanks
>
> --
> Thierry Fauck @ linux.vnet.ibm
>
>
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