[GRASS-user] Using an external hard drive as data source

GRASS GRASS user
1

Hi,

I'm using GRASS 6.4 on two machines in different locations (one Win XP,
the other Ubuntu 10.04), so I would like to keep my grassdata folder
on an external drive. However, when I try to run grass in Ubuntu using
the external hard drive (NTFS file system), I get the following error
as soon as I've selected the new data location and the GUI starts to
load:
-----
Execution failed: 'g.region -u -g -p -c'

Details:
Error: MAPSET PERMANENT - permission denied
-----

To run GRASS, I use the command 'sudo grass -wx'.

GRASS works fine when I run it from the internal hard drive.

Is there a way to get GRASS to work from the external drive?

Thanks
Hanlie

2

Hanlie Pretorius pisze:

Hi,

I'm using GRASS 6.4 on two machines in different locations (one Win XP,
the other Ubuntu 10.04), so I would like to keep my grassdata folder
on an external drive. However, when I try to run grass in Ubuntu using
the external hard drive (NTFS file system), I get the following error
as soon as I've selected the new data location and the GUI starts to
load:
-----
Execution failed: 'g.region -u -g -p -c'

Details:
Error: MAPSET PERMANENT - permission denied
-----

To run GRASS, I use the command 'sudo grass -wx'.

GRASS works fine when I run it from the internal hard drive.

Is there a way to get GRASS to work from the external drive?

Thanks
Hanlie
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Do you have write permission on your ntfs disk? It is possible that disk is mounted on ubuntu as read -only.

3

Hanlie wrote:

I'm using GRASS 6.4 on two machines in different locations
(one Win XP,
the other Ubuntu 10.04), so I would like to keep my
grassdata folder
on an external drive. However, when I try to run grass in
Ubuntu using
the external hard drive (NTFS file system), I get the
following error
as soon as I've selected the new data location and the GUI
starts to
load:
-----
Execution failed: 'g.region -u -g -p -c'

Details:
Error: MAPSET PERMANENT - permission denied
-----

To run GRASS, I use the command 'sudo grass -wx'.

GRASS works fine when I run it from the internal hard
drive.

Is there a way to get GRASS to work from the external
drive?

there should be a FAQ entry for this, but I can't find it on
the wiki!?

the quick answer is that you have to mount the external hard
drive so it is owned by the same user you will run grass with.
(typically your own user account and not root, as that is much
safer).

mount -o uid=[your user id]

or add this in the /etc/fstab file.

you'll have to look in /etc/passwd to see what your user
account's UID number is.

Hamish