On Tue, Jan 12, 2010 at 4:05 AM, John Cremona <john.crem...@gmail.com> wrote:
> I'm running a server under user "sage" using a pool of users sage0,
> sage1 etc to run the worksheets. Sage 4.3 on 64-bit ubuntu. All
> works fine with normal Sage cells, but I get this error when I put
> %magma at the top of a new cell in a new worksheet:
>
> Cell contents:
>
> %magma
> 2+2;
>
>
> Output:
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "_sage_input_3.py", line 4, in <module>
> print _support_.syseval(magma,
> ur\u0027\u0027\u00272+2;\u0027\u0027\u0027,
> \u0027/home/sage/.sage/sage_notebook.sagenb/home/cremona/9/cells/1\u0027)
> File "", line 1, in <module>
>
> File
> "/usr/local/sage/sage-4.3/local/lib/python2.6/site-packages/sagenb-0.4.8-py2.6.egg/sagenb/misc/support.py",
> line 464, in syseval
> system.chdir(dir)
I bet this is caused by changes in the notebook. Could you try
editing the file:
/usr/local/sage/sage-4.3/local/lib/python2.6/site-packages/sagenb-0.4.8-py2.6.egg/sagenb/misc/support.py
and replacing line 464 (the "system.chdir(dir)") by
try: system.chdir(dir)
except: pass
or -- simply delete the "system.chdir" line.
and see what happens. Please report back. That will likely work,
in which case we'll do something like that in the notebook, though
better will be to correctly define dir (it is wrong right now).
Please report back.
> File
> "/usr/local/sage/sage-4.3/local/lib/python2.6/site-packages/sage/interfaces/magma.py",
> line 905, in chdir
> magma.eval('ChangeDirectory("%s")'%dir)
> File
> "/usr/local/sage/sage-4.3/local/lib/python2.6/site-packages/sage/interfaces/magma.py",
> line 520, in eval
> raise RuntimeError, "Error evaluating Magma code.\nIN:%s\nOUT:%s"%(x, ans)
> RuntimeError: Error evaluating Magma code.
> IN:ChangeDirectory("/home/sage/.sage/sage_notebook.sagenb/home/cremona/9/cells/1");
> OUT:
>>> ChangeDirectory("/home/sage/.sage/sage_notebook.sagenb/home/cremona/9/cells
> ^
> Runtime error in 'ChangeDirectory': Cannot change directory to
> "/home/sage/.sage/sage_notebook.sagenb/home/cremona/9/cells/1"
> (Permission denied)
>
> Note that there is no error if I delete the first line ("%magma").
>
> I noticed that some relevant files have the following permissions:
>
> s...@selmer:~/.sage/sage_notebook.sagenb/home/cremona/9$ ls -al
> /home/sage/.sage/sage_notebook.sagenb/home/cremona/9
> total 24
> drwxr-xr-x 4 sage sage 4096 Jan 12 12:01 .
> drwxr-xr-x 12 sage sage 4096 Jan 12 11:57 ..
> drwxr-xr-x 3 sage sage 4096 Jan 12 11:58 cells
> drwxrwxrwx 2 sage sage 4096 Jan 12 11:57 data
> -rw-r--r-- 1 sage sage 1280 Jan 12 12:01 worksheet.html
> -rw-r--r-- 1 sage sage 381 Jan 12 12:01 worksheet_conf.pickle
>
> s...@selmer:~/.sage/sage_notebook.sagenb/home/cremona/9$ ls -al
> /home/sage/.sage/sage_notebook.sagenb/home/cremona/9/cells
> total 12
> drwxr-xr-x 3 sage sage 4096 Jan 12 11:58 .
> drwxr-xr-x 4 sage sage 4096 Jan 12 12:01 ..
> drwx------ 2 sage sage 4096 Jan 12 11:58 1
>
> s...@selmer:~/.sage/sage_notebook.sagenb/home/cremona/9$ ls -al
> /home/sage/.sage/sage_notebook.sagenb/home/cremona/9/cells/1
> total 8
> drwx------ 2 sage sage 4096 Jan 12 11:58 .
> drwxr-xr-x 3 sage sage 4096 Jan 12 11:58 ..
>
> If the issue were that the worksheet is running under user sage0 while
> the files are all owned by the notebook process sage, which I don't
> believe is true, then the "%magma" would make no difference.
>
> This problem did not arise when I did not use the pool. And the
> machine does have magma installed!
>
> Any ideas?
>
> John
>
> --
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>
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
--
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