For sage-2.4.2, Martin Albrecht reported that he does not see
the error message that I see when I run
sage -t devel/sage-main/sage/geometry/lattice_polytope.py
What I see is
[Errno 39] Directory not empty: '/home/kate/.sage//tmp/5852/'
I have investigated and determined that the problem only
occurs if the DOT_SAGE file is on a shared file system.
I also do not get the error message when DOT_SAGE is
on a local disk. I suspect this is why Martin did not see
the same error message.
The problem occurs in lattice_polytope.py when the
following lines are executed:
o = lattice_polytope.octahedron(3)
lattice_polytope.all_cached_data([o.polar()])
quit
The first two lines are from the example in
all_cached_data(). The 'quit' comes from 'sage -t'
Now the line 'lattice_polytope.all_cached_data([o.polar()])'
is supposed to give a traceback; unfortunately it also leaves
an open file descriptor. It is this open file descriptor to a file
in DOT_SAGE/tmp
that causes the problem when the sage 'quit' command
is run on a shared file system. The shared file system
notes that a process is reading from the file and so does
not allow the file to be deleted. Unfortunately this is precisely
what the sage 'quit' command tries to do (using shutil.rmtree) to
DOT_SAGE/tmp.
A fix is to have the sage 'quit' command close
all open file descriptors before attempting to
delete the directory DOT_SAGE/tmp. This
can be done by adding to
spkg/standard/sage-2.4.2/sage/all.py
in the routine quit_sage() right before the
lines
from sage.misc.misc import delete_tmpfiles
delete_tmpfiles()
add the following lines
# close all open file descriptors
import resource # Resource usage information.
maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
print maxfd;
if (maxfd == resource.RLIM_INFINITY):
maxfd = MAXFD
# Iterate through and close all file descriptors.
for fd in range(0, maxfd):
try:
os.close(fd)
except OSError: # ERROR, fd wasn't open to begin with (ignored)
pass
--
Kate Minola
University of Maryland, College Park
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