What I have: A LiveCD with 2.1 A USB pendrive with 2.1b 5-way
What I want to do: Burn a new cd with 2.1b without having to download a whole new ISO file.
My approach: I used the cd to boot from USB using the "fromhd=/dev/sda1 qemu frugal" cheatcodes. That part went fine. Then I copied the image on /dev/cdrom to my harddrive with "dd if=/dev/cdrom of=mydsl.iso" I did this on my harddrive because I don't have enough memory to do all this in RAM space.
So now I mount the iso with "mount -o loop -t iso9660 mydsl.iso /mnt/test" and I mount my pendrive. So far, so good. I'm excited because all I should need to do now to make this a "current" image is to copy the KNOPPIX file from /mnt/sda1/KNOPPIX to /mnt/test/KNOPPIX, but when I try, I get informed that my mounted ISO is read-only, and I can't remedy that even with a sudo.
So. I had a good idea, but I couldn't get it to work. Is it not possible to have RW access on a mounted ISO image? And just copying over the KNOPPIX file will effectively upgrade it right?
Quote (cmanb @ Jan. 22 2006,13:11)
Is it not possible to have RW access on a mounted ISO image?
Turns out there is in fact a -rw option to mount that mounts the device with read/write permissions. In this case, however, it seems to do bupkis.
original here.