CodeJail Install Failing

[Cecily Hunt]

Hi all,

I'm trying to install CodeJail so that I can use it as part of an external grader that I'm building. I followed the instructions on the CodeJail github page (https://github.com/edx/codejail), but when I run the first test described under the "Using CodeJail" section, I get the following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "codejail/safe_exec.py", line 151, in safe_exec
    extra_files=extra_files,
  File "codejail/jail_code.py", line 237, in jail_code
    realtime=LIMITS["REALTIME"], rlimits=create_rlimits(),
  File "codejail/subproc.py", line 42, in run_subprocess
    stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
  File "/usr/lib/python2.7/subprocess.py", line 710, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1335, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

Any ideas what might be going wrong?

Thanks,

Cecily

Cecily Hunt

MOOC Assistant Project Director

Harvey Mudd College

909.607.3850 | ch...@g.hmc.edu

[rahul pyd]

Hi Cecily,

Are you get past this error. I got the same errors messages after following the documentation at codejail official repository.

Regards, 

Rahul

[rahul pyd]

Hi Cecily,

Did you get past this error. I got the same error messages after following the documentation at codejail official repository.

Regards, 

Rahul

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[Cecily Hunt]

Hi Rahul,

I wasn't able to find a fix, and so I didn't end up using CodeJail.

Cecily

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[Ned Batchelder]

Rahul (and Cecily),

How are you running Open edX?  If you are running Python in a virtualenv, then CodeJail tries to automatically find another virtualenv based on the first one.  

For example, in a devstack:

$ which python

/edx/app/edxapp/venvs/edxapp/bin/python

$ ls -l /edx/app/edxapp/venvs

total 8

drwxr-xr-x 10 edxapp  edxapp  4096 Aug 15 12:05 edxapp/

drwxr-xr-x  8 sandbox sandbox 4096 Aug 15 11:51 edxapp-sandbox/

The error you are getting is likely because there isn't a second virtualenv to run the sandboxed Python code.

--Ned.

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[rahul pyd]

Hi Ned,

I am not trying to integrate Codejail with Open edX at this point -- but it is on the cards. I have been following the documentation for the project and see if I am able to set it up correctly as a *stand-alone* system.

Here is the setup I got:

(myproj)rhlpyd@nyc:~$ which python

/home/rhlpyd/aop-projects/codejail-test/myproj/bin/python

(myproj)rhlpyd@nyc:~$ ls -l aop-projects/codejail-test/

total 12

drwxrwxr-x 4 rhlpyd  rhlpyd  4096 Aug 14 13:02 codejail

drwxrwxr-x 7 rhlpyd  rhlpyd  4096 Aug 14 22:01 myproj

drwxrwxr-x 6 sandbox sandbox 4096 Aug 17 12:13 myproj-sandbox

rhlpyd@nyc:~$ sudo less /etc/sudoers.d/01-sandbox

rhlpyd ALL=(sandbox) SETENV:NOPASSWD:/home/rhlpyd/aop-projects/codejail-test/myproj-sandbox/bin/python

rhlpyd ALL=(sandbox) SETENV:NOPASSWD:/usr/bin/find

rhlpyd ALL=(ALL) NOPASSWD:/usr/bin/pkill

rhlpyd@nyc:~$ less /etc/apparmor.d/home.rhlpyd.aop-projects.codejail-test.myproj-sandbox.bin.python

#include <tunables/global>

/home/rhlpyd/aop-projects/codejail-test/myproj-sandbox/bin/python {

    #include <abstractions/base>

    #include <abstractions/python>

    /home/rhlpyd/aop-projects/codejail-test/myproj-sandbox/** mr,

    # If you have code that the sandbox must be able to access, add lines

    # pointing to those directories:

    

    /home/rhlpyd/aop-projects/codejail-test/myproj-sandbox/lib/python2.7/site-packages/** r,

    /tmp/codejail-*/ rix,

    /tmp/codejail-*/** wrix,

}

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Rahul

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[rahul pyd]

Adding to my last mail, the following are the commands I ran in 'myproj' env  that led to the error messages.

import codejail.jail_code

codejail.jail_code.configure('python', '/home/rhlpyd/aop-projects/codejail-test/myproj-sandbox/bin/python')

import codejail.safe_exec

codejail.safe_exec.safe_exec("import os\nos.system('ls /etc')", {})

--

Rahul