[GRASS-dev] [GRASS GIS] #2337: t.list hangs on newly created temporal DB

[GRASS GIS]

#2337: t.list hangs on newly created temporal DB
-----------------------------+----------------------------------------------
 Reporter:  neteler          |       Owner:  grass-dev@…              
     Type:  defect           |      Status:  new                      
 Priority:  normal           |   Milestone:  7.0.0                    
Component:  Temporal         |     Version:  svn-trunk                
 Keywords:  t.list,t.create  |    Platform:  Linux                    
      Cpu:  Unspecified      |  
-----------------------------+----------------------------------------------
Changes (by neteler):

  * keywords:  t.list => t.list,t.create


Comment:

 Reporting again with hanging t.create: We run current GRASS 7.1.svn in the
 office and mount /grassdata via NFS3 from our cluster frontend machine.

 With strace we got an idea where the problem is. Note that the user is
 not operating in the mapset "lexem_matteo" cited below nor is it in
 the mapset search path but it simply exists in the same location which
 we share among our group:


 {{{
 GRASS 7.1.svn (eu_laea): >
 strace t.create output=Tdaily_modis_hants type=strds semantictype=mean
 temporaltype=absolute title="daily temperature from Mod lst hants"
 description="daily T from hants on modis lst"
 ...
 getuid()                                = 10014
 stat("/grassdata/eu_laea/lexem_matteo", {st_mode=S_IFDIR|0755,
 st_size=4096, ...}) = 0
 getuid()                                = 10014
 stat("/grassdata/eu_laea/lexem_matteo", {st_mode=S_IFDIR|0755,
 st_size=4096, ...}) = 0
 getuid()                                = 10014
 stat("/grassdata/eu_laea/lexem_matteo", {st_mode=S_IFDIR|0755,
 st_size=4096, ...}) = 0
 getuid()                                = 10014
 stat("/grassdata/eu_laea/lexem_matteo", {st_mode=S_IFDIR|0755,
 st_size=4096, ...}) = 0
 [...]
 stat("/grassdata/eu_laea/lexem_matteo", {st_mode=S_IFDIR|0755,
 st_size=4096, ...}) = 0
 getuid()                                = 10014
 stat("/grassdata/eu_laea/lexem_matteo", {st_mode=S_IFDIR|0755,
 st_size=4096, ...}) = 0
 getuid()                                = 10014
 stat("/grassdata/eu_laea/lexem_matteo", {st_mode=S_IFDIR|0755,
 st_size=4096, ...}) = 0
 [...]
 ^CTraceback (most recent call last):
   File "/usr/local/grass-7.1.svn/scripts/t.create", line 84, in <module>
     main()
   File "/usr/local/grass-7.1.svn/scripts/t.create", line 77, in main
     tgis.init()
   File "/usr/local/grass-7.1.svn/etc/python/grass/temporal/core.py",
 line 593, in init
 Process Process-1:
 Process Process-2:
 Traceback (most recent call last):
 Traceback (most recent call last):
   File "/usr/lib64/python2.6/multiprocessing/process.py", line 232, in
 _bootstrap
   File "/usr/lib64/python2.6/multiprocessing/process.py", line 232, in
 _bootstrap
     self.run()
   File "/usr/lib64/python2.6/multiprocessing/process.py", line 88, in run
     self._target(*self._args, **self._kwargs)
   File
 "/usr/local/grass-7.1.svn/etc/python/grass/pygrass/messages/__init__.py",
 line 65, in message_server
     self.run()
   File "/usr/lib64/python2.6/multiprocessing/process.py", line 88, in run
     self._target(*self._args, **self._kwargs)
   File
 "/usr/local/grass-7.1.svn/etc/python/grass/temporal/c_libraries_interface.py",
 line 769, in c_library_server
     conn.poll(None)
 KeyboardInterrupt
     dbif = SQLDatabaseInterfaceConnection()
   File "/usr/local/grass-7.1.svn/etc/python/grass/temporal/core.py",
 line 839, in __init__
     self.tgis_mapsets = get_available_temporal_mapsets()
   File "/usr/local/grass-7.1.svn/etc/python/grass/temporal/core.py",
 line 439, in get_available_temporal_mapsets
     mapsets = c_library_interface.available_mapsets()
   File
 "/usr/local/grass-7.1.svn/etc/python/grass/temporal/c_libraries_interface.py",
 line 1220, in available_mapsets
     return self.client_conn.recv()
 KeyboardInterrupt
     functions[data[0]](lock, conn, data)
   File
 "/usr/local/grass-7.1.svn/etc/python/grass/temporal/c_libraries_interface.py",
 line 159, in _available_mapsets
     if libgis.G_mapset_permissions(mapset) > 0:
 KeyboardInterrupt
 }}}


 The ID of the actual user is 10014.

 PROBLEM:
 The issue happens in line 142
 lib/python/temporal/c_libraries_interface.py

 function def _available_mapsets(lock, conn, data):

 where a while loop is used. The issue is apparently caused by the fact
 that in our current cluster setup, after reinstallation, the NFS
 daemon doesn't properly map the user ID's to the local workstation in
 the office where not all users are existing. While we have to fix
 this, it should not lead to an endless loop:

 Apparently libgis.G_mapset_permissions() does not behave properly for
 this NFS case. It should be able to leave the while loop rather than
 getting stuck there.

 {{{
 # example for one of our NFS mounted directories as seen on the office
 workstation:
 ls -la /grassdata/eu_laea/lexem_matteo
 total 312
 drwxr-xr-x  13 10012 gis   4096 Jan 17 16:09 .
 drwxrwxr-x 125  1338 gis  16384 Feb  3 18:35 ..
 -rw-------   1 10012 gis 122050 Jan  1 18:26 .bash_history
 -rw-r--r--   1 10012 gis   1949 Jan 17 16:09 .bashrc
 drwxr-xr-x   2 10012 gis  20480 Dec 27 14:22 cats
 drwxr-xr-x   2 10012 gis  20480 Dec 27 14:22 cell
 drwxr-xr-x   2 10012 gis  20480 Dec 27 14:22 cellhd
 drwxr-xr-x  19 10012 gis  20480 Dec 27 14:22 cell_misc
 ...
 }}}


 --> user IDs not transmitted, our problem, but
 libgis.G_mapset_permissions() doesn't deal with it properly (or
 def_available_mapsets()).

-- 
Ticket URL: <http://trac.osgeo.org/grass/ticket/2337#comment:4>
GRASS GIS <http://grass.osgeo.org>