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)
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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