unable to write to mounted .img file

decaf · 03-17-2005, 03:06 PM

I have mounted my .img file using a loop device. the .img file contains a Fat32 filesystem. I am using it to transfer data between windows running under qemu and my host linux system. Qemu can read and write to the image fine. However under linux I have to be root to write to the .img file when it is mounted. (qemu uses the .img file directly without it being mounted). I have tried several .img files all with the same problem, even when qemu is not running. Any ideas?

titanium_geek · 03-17-2005, 03:23 PM

Hello and Welcome to LQ!

You need to change the permissions.
Sorry I can't think of it off the top of my head, but you should be able to right click on the file and choose to allow everyone the ability to write.
chmod (I think) is the command.

google for permissions.

titanium_geek

titanium_geek · 03-17-2005, 03:31 PM

PS it helps if you fill out things like the distro in your profile...

decaf · 03-18-2005, 12:33 PM

I use SimplyMepis 3.3. I have tried changing the permissions and they will not change. What other information would be helpful in figuring this out?

titanium_geek · 03-19-2005, 12:34 PM

try changing the permissions as root.

titanium_geek

decaf · 03-19-2005, 01:51 PM

I did try to change them as root.

Pauli · 03-19-2005, 07:11 PM

su
chmod ugo=rwx file.whatever

(that should work, its been a while since I've been doing any UNIX) :-P
And if there is an error, tell me what it is.

decaf · 03-19-2005, 09:28 PM

I have tried that. No errors but the permissions do not change. I have tried changing them on the image file on the directory I mount the file to and the files in the image. None of them will change.

Pauli · 03-19-2005, 09:31 PM

You're going to have to change the way you mount it.

Linux is very very bitchy about letting me mount my NTFS drive, it will only let root read it. Christ....I forget what i had to chuck in the fstab to get it to work. Check in search for how to mount a NTFS drive or whatnot with proper permissions.

I think that may be it, but I'm not positive.

decaf · 03-21-2005, 12:30 PM

this isn't an ntfs drive it is a drive image formatted with fat32 aka vfat. My other users can read it but only root can write to it. I have mounted it manually and through fstab with the same result. I have tried changing ownership and permissions as root and other users but they do not change. I am running Debian based SimplyMepis 3.3. I have an NTFS drive that works just fine. Any user can read it. I can use a physical drive formatted as fat32 just fine. I am just having issues with the image file.

Pauli · 03-21-2005, 05:15 PM

I've had fat32 drives give me the same problem. IMO something is wrong with your mounting.

If you disagree, then I can't offer you any help, sorry.