Codejail problem with Matplotlib (Cannot create LoncapaProblem block)

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1

Hi,

I am facing the problem during the working on the codejail with matplotlib
open edx version : openedx-mfe:14.0.1
code jail version : codejailservice:14.1.0
please see the error message below

cannot create LoncapaProblem block-v1:VUP+Math101+2022+type@problem+block@3319c4e42da64a74b0e40f048e3f2599: Error while executing script code: Couldn't execute jailed code: stdout: b'', stderr: b'Traceback (most recent call last):\n File &#34;jailed_code&#34;, line 19, in <module>\n exec(code, g_dict)\n File &#34;<string>&#34;, line 66, in <module>\n File &#34;/sandbox/venv/lib/python3.8/site-packages/matplotlib/__init__.py&#34;, line 921, in <module>\n dict.update(rcParams, _rc_params_in_file(matplotlib_fname()))\n File &#34;/sandbox/venv/lib/python3.8/site-packages/matplotlib/__init__.py&#34;, line 602, in matplotlib_fname\n for fname in gen_candidates():\n File &#34;/sandbox/venv/lib/python3.8/site-packages/matplotlib/__init__.py&#34;, line 599, in gen_candidates\n yield os.path.join(get_configdir(), \'matplotlibrc\')\n File &#34;/sandbox/venv/lib/python3.8/site-packages/matplotlib/__init__.py&#34;, line 239, in wrapper\n ret = func(**kwargs)\n File &#34;/sandbox/venv/lib/python3.8/site-packages/matplotlib/__init__.py&#34;, line 502, in get_configdir\n return _get_config_or_cache_dir(_get_xdg_config_dir())\n File &#34;/sandbox/venv/lib/python3.8/site-packages/matplotlib/__init__.py&#34;, line 474, in _get_config_or_cache_dir\n tempfile.mkdtemp(prefix=&#34;matplotlib-&#34;)\n File &#34;/opt/pyenv/versions/3.8.6_sandbox/lib/python3.8/tempfile.py&#34;, line 347, in mkdtemp\n prefix, suffix, dir, output_type = _sanitize_params(prefix, suffix, dir)\n File &#34;/opt/pyenv/versions/3.8.6_sandbox/lib/python3.8/tempfile.py&#34;, line 117, in _sanitize_params\n dir = gettempdir()\n File &#34;/opt/pyenv/versions/3.8.6_sandbox/lib/python3.8/tempfile.py&#34;, line 286, in gettempdir\n tempdir = _get_default_tempdir()\n File &#34;/opt/pyenv/versions/3.8.6_sandbox/lib/python3.8/tempfile.py&#34;, line 218, in _get_default_tempdir\n raise FileNotFoundError(_errno.ENOENT,\nFileNotFoundError: [Errno 2] No usable temporary directory found in [\'/tmp\', \'/var/tmp\', \'/usr/tmp\', \'/tmp/codejail-lbfd69da\']\n' with status code: 1. For more information check Codejail Service logs.
I have already installed the Codejail and Matplotlib on docker. Other commands working well on problem > advance black problem.
import os
but getting error on the
import matplotlib
Codejail service logs as follows:

{"log":"[pid: 6|app: 0|req: 20/39] 172.18.0.10 () {36 vars in 483 bytes} [Tue Nov 22 11:24:59 2022] POST /api/v0/code-exec =\u003e generated 1978 bytes in 742 msecs (HTTP/1.1 200) 2 headers in 73 bytes (1 switches on core 0)\n","stream":"stderr","time":"2022-11-22T11:25:00.151315626Z"} {"log":"2022-11-22 11:26:23,304 INFO 9 [codejailservice.app] code_exec_service.py:52 - Running problem_id:53fbaa04859f41989ab967c15a12c013 jailed code for course_id:course-v1:VUP+Math101+2022 ...\n","stream":"stderr","time":"2022-11-22T11:26:23.30489438Z"} {"log":"2022-11-22 11:26:23,343 INFO 9 [codejailservice.app] code_exec_service.py:73 - Jailed code was executed in 0.03849988000001758 seconds.\n","stream":"stderr","time":"2022-11-22T11:26:23.343618965Z"} {"log":"[pid: 9|app: 0|req: 20/40] 172.18.0.10 () {36 vars in 483 bytes} [Tue Nov 22 11:26:23 2022] POST /api/v0/code-exec =\u003e generated 73 bytes in 40 msecs (HTTP/1.1 200) 2 headers in 71 bytes (1 switches on core 0)\n","stream":"stderr","time":"2022-11-22T11:26:23.344178308Z"} {"log":"2022-11-23 04:15:24,786 INFO 6 [codejailservice.app] code_exec_service.py:52 - Running problem_id:3319c4e42da64a74b0e40f048e3f2599 jailed code for course_id:course-v1:VUP+Math101+2022 ...\n","stream":"stderr","time":"2022-11-23T04:15:24.786287416Z"} {"log":"2022-11-23 04:15:25,582 ERROR 6 [codejailservice.app] code_exec_service.py:70 - Error found while executing jailed code.\n","stream":"stderr","time":"2022-11-23T04:15:25.582527974Z"} {"log":"[pid: 6|app: 0|req: 21/41] 172.18.0.10 () {36 vars in 483 bytes} [Wed Nov 23 04:15:24 2022] POST /api/v0/code-exec =\u003e generated 1978 bytes in 798 msecs (HTTP/1.1 200) 2 headers in 73 bytes (1 switches on core 0)\n","stream":"stderr","time":"2022-11-23T04:15:25.583132326Z"} {"log":"2022-11-23 06:00:15,150 INFO 9 [codejailservice.app] code_exec_service.py:52 - Running problem_id:3319c4e42da64a74b0e40f048e3f2599 jailed code for course_id:course-v1:VUP+Math101+2022 ...\n","stream":"stderr","time":"2022-11-23T06:00:15.15073834Z"} {"log":"2022-11-23 06:00:15,891 ERROR 9 [codejailservice.app] code_exec_service.py:70 - Error found while executing jailed code.\n","stream":"stderr","time":"2022-11-23T06:00:15.8916806Z"} {"log":"[pid: 9|app: 0|req: 21/42] 172.18.0.10 () {36 vars in 483 bytes} [Wed Nov 23 06:00:15 2022] POST /api/v0/code-exec =\u003e generated 1978 bytes in 742 msecs (HTTP/1.1 200) 2 headers in 73 bytes (1 switches on core 0)\n","stream":"stderr","time":"2022-11-23T06:00:15.892225441Z"}

2

Hi Mian,
I’ve had the same problem, and I have found a workaround. I hope it’s not too late.
Apparently it’s a bug in the Python tempfile library. The fact is that the sandbox has not a /tmp dir needed by matplotlib and it crashes due to a Random object issue.
The workaround is easy; just set an environment variable for the temp dir to be used by matplotlib, before importing it. Of course the path must be an existing one in the sandbox. I’ve tried

import os
os.environ["MPLCONFIGDIR"] = "/sandbox/venv"
import matplotlib.pyplot as plt

and it works fine.

Hope this helps.
José Parera