#5965: Check {{{/dev/pts}}} and {{{/dev/shm}}} requirement on linux
--------------------------+-------------------------------------------------
Reporter: tornaria | Owner: mabshoff
Type: defect | Status: new
Priority: major | Milestone:
Component: distribution | Keywords:
--------------------------+-------------------------------------------------
Sage requires both pseudoterminals (for pexpect) and shared memory (for
pyprocessing semaphores). On modern linux, those are implemented via
special filesystem mounts:
- {{{/dev/pts}}} for pseudoterminals (of type {{{devpts}}})
- {{{/dev/shm}}} for shared memory (of type {{{tmpfs}}})
A normal system has those mounts active. However, running sage in a chroot
fails in weird ways if we neglect to mount those inside the chroot:
- the first one makes pexpect interfaces to fail, e.g.:
{{{
sage: gap(2)
A workspace appears to have been corrupted... automatically rebuilding
(this is harmless).
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/tornaria/.sage/temp/arf/10828/_home_tornaria__sage_init_sage_0.py in
<module>()
/opt/sage-3.4.1-x86_64-Linux/local/lib/python2.5/site-
packages/sage/interfaces/expect.pyc in __call__(self, x, name)
1002 return cls(self, x, name=name)
1003 try:
-> 1004 return self._coerce_from_special_method(x)
1005 except TypeError:
1006 raise
/opt/sage-3.4.1-x86_64-Linux/local/lib/python2.5/site-
packages/sage/interfaces/expect.pyc in _coerce_from_special_method(self,
x)
1026 s = '_gp_'
1027 try:
-> 1028 return (x.__getattribute__(s))(self)
1029 except AttributeError:
1030 return self(x._interface_init_())
/opt/sage-3.4.1-x86_64-Linux/local/lib/python2.5/site-
packages/sage/structure/sage_object.so in
sage.structure.sage_object.SageObject._gap_
(sage/structure/sage_object.c:3370)()
/opt/sage-3.4.1-x86_64-Linux/local/lib/python2.5/site-
packages/sage/structure/sage_object.so in
sage.structure.sage_object.SageObject._interface_
(sage/structure/sage_object.c:3018)()
/opt/sage-3.4.1-x86_64-Linux/local/lib/python2.5/site-
packages/sage/interfaces/expect.pyc in __call__(self, x, name)
1000 return x
1001 if isinstance(x, basestring):
-> 1002 return cls(self, x, name=name)
1003 try:
1004 return self._coerce_from_special_method(x)
/opt/sage-3.4.1-x86_64-Linux/local/lib/python2.5/site-
packages/sage/interfaces/expect.pyc in __init__(self, parent, value,
is_name, name)
1375 except (TypeError, KeyboardInterrupt, RuntimeError,
ValueError), x:
1376 self._session_number = -1
-> 1377 raise TypeError, x
1378 self._session_number = parent._session_number
1379
TypeError: Unable to start gap because the command 'gap -r -b -p -T -o
9999G /opt/sage-3.4.1-x86_64-Linux/data//extcode/gap/sage.g' failed.
}}}
- the second one makes pyprocessing to fail, which can be reproduced by:
{{{
sage: import processing, processing.synchronize
sage:
processing._processing.SemLock(processing.synchronize.BOUNDED_SEMAPHORE,
1)
---------------------------------------------------------------------------
OSError Traceback (most recent call
last)
/home/tornaria/.sage/temp/arf/10892/_home_tornaria__sage_init_sage_0.py in
<module>()
OSError: [Errno 38] Function not implemented
}}}
Both failures are detected by doctests. The first one all over the place,
and the second one by doctests in {{{sage/parallel/multiprocessing.py}}}
and {{{sage/parallel/decorate.py}}}.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5965>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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