setugid() error using matplotlib with apache and django

Question

I'm using matplotlib in a Django app served through apache on Mac OS X 10.7.5 but I can't get it to plot a figure for me. I've imported import matplotlib.pyplot as plt, and the line in my view,

plt.plot(x, y)

(x and y are numpy arrays) is causing the error

2013-01-23 16:39:16.731 httpd[381:203] The application with bundle ID (null) is running setugid(), which is not allowed.

in my apache error_log. I'm afraid I don't know what setugid() is, or how to make running it allowed for my app. My $MPLCONFIGDIR is set to /tmp/.mplconfig and apache as user _www has written a couple of empty directories to it, so that seems to be working OK. Can anyone give me a clue?

Update: if I

from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
from matplotlib.figure import Figure

and set up a figure, subplot and axes (the whole caboodle), I can savefig() without an error... what extra permissions does pyplot need?

More info here. Seems like a security setting on OS X is preventing it, and the quick fix seems to be to run apache as root. — tiago
– tiago, Commented Jan 23, 2013 at 17:13
Thanks for the reply tiago. Is running apache as root entirely wise, though? — xnx
– xnx, Commented Jan 23, 2013 at 17:19
In Linux/Unix apache usually is started as root but runs as user 'nobody'. I don't know in your particular case if it's wise or not. — tiago
– tiago, Commented Jan 24, 2013 at 9:53

Naveen Kumar R B · Accepted Answer · 2017-01-31 06:00:09Z

3

Using the agg backend after importing matplotlib got rid of the setugid() error in a Flask app running under OS X Server in Sierra

import matplotlib as mpl

mpl.use('agg')

edited Jan 31, 2017 at 6:00

Naveen Kumar R B

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answered Jan 31, 2017 at 5:40

Scott Lasley

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Comments

RandomEli · Accepted Answer · 2018-01-26 18:05:11Z

0

You can also add backend configuration globally for your system in ~/.matplotlib/matplotlibrc like:

backend: TkAgg

This will solve your problem as well. If you don't have matplotlibrc, just create one.

answered Jan 26, 2018 at 18:05

RandomEli

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