[GRASS-windows] Problems with accessing location between windows and linux

[Moritz Lennert]

On 10/10/08 15:57, Martin Maier wrote:
> Moritz Lennert schrieb am 10.10.2008 15:10:
>> On 10/10/08 11:46, Martin Maier wrote:
>>> Hello,
>>>
>>> I am using a dual boot system with Windows XP and OpenSuse. I have
>>> created some locations and mapsets using GRASS Windows (with the native
>>> windows installer, 6.3.0-4), on a FAT32 disk. When I now try to access
>>> these locations out of the OpenSuse System (navigating to the database),
>>> I can see the created locations, but if I chose a location I get no
>>> mapsets. So I can not access any data created with the windows version
>>> of GRASS.
>>> Is there any difference in creating files between the windows and the
>>> linux versions of GRASS or is a problem with accessing the FAT32
>>> file-system with the Linux-GRASS?
>>> Any hint would be great.
>> Probably an issue with permissions. How do you mount the windows
>> partition ?
>>
>> You might be able to create a mapset in SUSE and then use g.mapsets
>> (in gis.m: Config->GRASS working environment->Mapset access) to give
>> yourself read access to the other mapsets.
>>
>> Moritz
> Hello Moritz,
> 
> thank you for the tip.
> I mount with the following line in fstab:
> /dev/sda3            /media/daten         vfat      
> users,gid=users,umask=0002,utf8=true,quiet 0 0
> So I have read and write permission to the directory (I am member of the
> group 'users').
> 
> But it is indeed a problem of permission, but I don't know what's the
> problem:
> If I start GRASS in text-mode within OpenSuse, I can create a new mapset
> (e.g. mapset1) within the location 'loc1' which I have created within
> Windows and mounted as described. GRASS saves a new folder 'mapset1' in
> the folder 'loc1'. Within the folder 'mapset1' there are two files: var
> and wind and a folder named dbf.
> After that a error message appears:
> 
> Sorry, no access to <<mapset1>>.
> 
> Mapsets in location <loc1>
> ----------------------
>    PERMANENT              test.grc              mapset1
> 
> note: you do not have access to any of these mapsets
> 
> Then GRASS closes down. But GRASS has just created the mapset1 folder,
> so I should have write permission, or not?

AFAIK, group permissions are not enough, you need to be the _owner_ of 
the directory and files. Can you chown the files in the windows 
partition ? Maybe you need to play around with the umask setting.

There might also be other problems such as case. Check out the following 
threads:

http://thread.gmane.org/gmane.comp.gis.grass.user/23652/
http://thread.gmane.org/gmane.comp.gis.grass.devel/8822/focus=8844

Moritz