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

[Isaac Ullah]

You might try using "g.access" in WinGRASS, giving permission for "others"
to access the mapset. I also run a dual boot (Kubuntu/Windows), as well as
run back and forth between various Linux, Mac, and Windows machines with the
same mapsets, and sometimes run into these kind of permission problems. If
it is not solved with the g.access trick, you should try starting grass as
superuser (su in the console), and see if you still hit permission issues...

Cheers,

Isaac

Message: 4
Date: Fri, 10 Oct 2008 17:12:22 +0200
From: Moritz Lennert <mlennert at club.worldonline.be>
Subject: Re: [GRASS-windows] Problems with accessing location between
       windows and linux
To: Martin Maier <martmai at gmx.de>
Cc: grass-windows at lists.osgeo.org
Message-ID: <48EF70D6.3030502 at club.worldonline.be>
Content-Type: text/plain; charset=ISO-8859-15; format=flowed

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


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End of grass-windows Digest, Vol 26, Issue 11
*********************************************



-- 

Isaac I Ullah, M.A.

Archaeology PhD Student,
ASU School of Evolution and Social Change

Research Assistant,
Mediterranean Landscape Dynamics Project
***************************************************
isaac.ullah at asu.edu
ullah at archaeologist.com

http://www.public.asu.edu/~iullah
***************************************************
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