My second snap ;-)

[Loïc Minier]

Hi,

Right; matplotlib expects matplotlibrc to be installed. Looking at
matplotlib/__init__.py,
you can see rc_params() calls matplotlib_fname() to get the default config
filename.

The search order there is:

    - `$PWD/matplotlibrc`

    - `$MATPLOTLIBRC/matplotlibrc`

    - `$MPLCONFIGDIR/matplotlibrc`

          - `$HOME/.matplotlib/matplotlibrc`, if it exists

          - or `$XDG_CONFIG_HOME/matplotlib/matplotlibrc` (if

            $XDG_CONFIG_HOME is defined)

          - or `$HOME/.config/matplotlib/matplotlibrc` (if

            $XDG_CONFIG_HOME is not defined)

         - `$HOME/.matplotlib/matplotlibrc` if `$HOME` is defined.

    - Lastly, it looks in `$MATPLOTLIBDATA/matplotlibrc` for a

      system-defined copy.


So just create a matplotlibrc in your $SNAP and you should be good

Cheers,

- Loïc

On Sun, Oct 2, 2016 at 9:54 AM, Robert Park <robert.park at canonical.com>
wrote:

> Hi all!
>
> Back again with a second attempt, this time I'm not trying to modify
> the host system so I'm hoping this should be a lot easier/possible!
>
> Here's my snapcraft.yaml:
>
> https://git.launchpad.net/~robru/+git/weightloss/tree/snapcraft.yaml
>
> Pretty simple little flask webapp, just does some data manipulations
> and then serves graphics over HTTP.
>
> Snap builds ok but when I run it I get this:
>
>  weighttracker
> Traceback (most recent call last):
>   File "/snap/weighttracker/x2/run.py", line 15, in <module>
>     from graph import draw
>   File "/snap/weighttracker/x2/graph.py", line 14, in <module>
>     from matplotlib.dates import DateFormatter
>   File "/snap/weighttracker/x2/usr/lib/python3/dist-packages/
> matplotlib/__init__.py",
> line 1133, in <module>
>     rcParams = rc_params()
>   File "/snap/weighttracker/x2/usr/lib/python3/dist-packages/
> matplotlib/__init__.py",
> line 977, in rc_params
>     return rc_params_from_file(fname, fail_on_error)
>   File "/snap/weighttracker/x2/usr/lib/python3/dist-packages/
> matplotlib/__init__.py",
> line 1102, in rc_params_from_file
>     config_from_file = _rc_params_in_file(fname, fail_on_error)
>   File "/snap/weighttracker/x2/usr/lib/python3/dist-packages/
> matplotlib/__init__.py",
> line 1020, in _rc_params_in_file
>     with _open_file_or_url(fname) as fd:
>   File "/snap/weighttracker/x2/usr/lib/python3.5/contextlib.py", line
> 59, in __enter__
>     return next(self.gen)
>   File "/snap/weighttracker/x2/usr/lib/python3/dist-packages/
> matplotlib/__init__.py",
> line 1005, in _open_file_or_url
>     with io.open(fname, encoding=encoding) as f:
> PermissionError: [Errno 13] Permission denied: '/etc/matplotlibrc'
>
>
> Not really sure what's going on, but it looks like matplotlib is
> hard-coding "/etc":
>
> $ cat /snap/weighttracker/x2/usr/lib/python3/dist-packages/
> matplotlib/__init__.py
> | grep /etc
>     path = '/etc'  # guaranteed to exist or raise
>
>
> Do I have to patch matplotlib here or is there some way snapcraft can
> fix this for me?
>
> (frustratingly the matplotlib code seems to harmlessly ignore the file
> if it doesn't exist, but they didn't anticipate the idea that they
> wouldn't have permission, so the code just barfs)
>
>
>
> Thanks.
>
> --
> robru
>
> --
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>



-- 
- Loïc
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