[GRASS-dev] Re: [GRASS GIS] #446: put user and machine name into .gislock file

[GRASS GIS]

#446: put user and machine name into .gislock file
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  Reporter:  benducke     |       Owner:  grass-dev at lists.osgeo.org
      Type:  enhancement  |      Status:  new                      
  Priority:  minor        |   Milestone:  6.4.0                    
 Component:  default      |     Version:  svn-trunk                
Resolution:               |    Keywords:  locking, .gislock        
  Platform:  All          |         Cpu:  Unspecified              
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Comment (by glynn):

 Replying to [ticket:446 benducke]:
 > If a .gislock file gets created for a user, then it might be a good idea
 to store that user's current login name and machine name in the file. That
 way, external GUIs that encounter a lockfile when trying to log a user
 into a mapset will be able to output a more specific error message,
 including the lockfile creator's identity, giving the user a better clue
 as to whether the lockfile can be safely deleted or not.

 The machine name should go into the file. At present, etc/lock reads the
 PID and checks whether the process is still running. Obviously, this only
 works if the creator process is running on the same system as the checking
 process.

 Also, the current format is an "int" in the platform's native format, so
 you can't even report the PID correctly if it was written using a
 different byte order (or sizeof(int)).

 lib/init/lock.c should at least check that PID is positive before checking
 for existence.

 > Not sure what version of GRASS this could go into, but it seems to me it
 would not affect any of the current functionality(?).

 It can't go into 6.x, as existing versions of GRASS won't understand the
 new format, and in the case where the database is shared via NFS, you
 can't assume that all systems are using the same version of GRASS.

-- 
Ticket URL: <http://trac.osgeo.org/grass/ticket/446#comment:2>
GRASS GIS <http://grass.osgeo.org>