Changing to read/write mode mounting Knoppix

Quote:

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Originally Posted by kermitq

But knoppix adds autmaticaly lines to fstab. The Knoppix CD is add to fstab dynamically. and it is added as read-only (nothing strange if it is CD - but I use Knoppix on USB pendrive). I'm looking for scripts which adds these lines to fstab config file. Maybe in that script I could change mounting to read-write.

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Ah ok, in this case the 'script file' :P is '/etc/init.d/knoppix-autoconfig'.
You have to look for a bunch of lines that starts with something like '# Starting creating /etc/fstab...' and comment_out/delete them or follow a less_invasive way already suggested by me here. :wink:

And that it is what I what to know! I will try to mod auto-config when I return home after my job.

Cheers

Quote:

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Originally Posted by kermitq

Hi all,

I use USB Flash Drive for Knoppix ,but it is mounted as read only media So the question is: how to set Knoppix's USB mounting from read-only to read-write. What script does mount Knoppix's media ?

Cheers!

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You may want to try mount -o remount,rw {device_name} {mount_point}

Here, {device_name} is the device name for your usb partition as it is booted into (may be /dev/sda1 ?), and {mount_point} is most likely "/cdrom", but I am not 100% sure.

If things don't work out, please post the listings from "mount" command and "cat /proc/mounts" when booted in.

Also, please describe how you get it to boot. Are you following the instructions here?

Please note that I am not a "guru", but know a couple of things here and there.

If you want to modify the system file itself so that it always boots RW, I think that the file to look at is "linuxrc" which is found inside the miniroot.

Quote:

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Originally Posted by tablet_guy

If you want to modify the system file itself so that it always boots RW, I think that the file to look at is "linuxrc" which is found inside the miniroot.

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This is correct you are looking for approximately line 487 in linuxrc. If you change from this

Code:

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mountit /dev/cloop /KNOPPIX "-o ro" || FOUND_KNOPPIX=""

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to this

Code:

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mountit /dev/cloop /KNOPPIX "-o rw" || FOUND_KNOPPIX=""

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you should be on the right track.

Quote:

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Originally Posted by firnsy

Quote:

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Originally Posted by tablet_guy

If you want to modify the system file itself so that it always boots RW, I think that the file to look at is "linuxrc" which is found inside the miniroot.

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This is correct you are looking for approximately line 487 in linuxrc. If you change from this

Code:

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mountit /dev/cloop /KNOPPIX "-o ro" || FOUND_KNOPPIX=""

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to this

Code:

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mountit /dev/cloop /KNOPPIX "-o rw" || FOUND_KNOPPIX=""

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you should be on the right track.

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Actually, I doubt if that'd work. A cloop device is not writable, as of now. The device holding the KNOPPIX root file system image needs to be set "rw".

The problem is that, it isn't clear exactly how the poster is booting into the USB stick, and what filesystem is on the partition where KNOPPIX root fs is located by the booting process (namely initrd). He/she could also be using Rumbyeke's setup, for all you know.

Let me assume that his setup is as follows: the USB partition is formatted as some fs other than NTFS, and all the files found on knoppix CD (not just the compress root fs) are found in that partition's root folder.

Then, I think that the line to modify is line 467, from

Code:

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if mountit $i /cdrom "-o ro" >/dev/null 2>&1; then

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to

Code:

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if mountit $i /cdrom "-o rw" >/dev/null 2>&1; then

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Strictly speaking, the script should be modified to adaptively or upon a boot prompt option permit mounting the boot media RW, because, this line would fail for non-RW devices like the cdrom.

If the posted is still following, let him/her try and make this change and see if it works.

I will post a followup regarsless, as soon as I am able to do some testing on my own with the latest version of Knoppix (I had played with this on earlier versions).

thanks.

:D yes ... my bad, to be honest I didn't even look closely at the line, still waking up.

Quote:

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Originally Posted by tablet_guy

Strictly speaking, the script should be modified to adaptively or upon a boot prompt option permit mounting the boot media RW

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This would be the elegent solution

Quote:

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Originally Posted by tablet_guy

because, this line would fail for non-RW devices like the cdrom.

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It shouldn't fail, mount is smart enough to recognise that the medium is in fact read only and act accordingly by notifying on stderr that it is mounting read only and even returning an successful code 0.

the results of linuxrc's customizations:

after changing one line to:

Code:

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if mountit $i /cdrom "-o rw" >/dev/null 2>&1; then

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The system boots, but the usb stick is still read-only.

After changing two lines lines, (following both tablet_guy and firnsy's posts)

Code:

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mountit /dev/cloop /KNOPPIX "-o rw" || FOUND_KNOPPIX=""
...

if mountit $i /cdrom "-o rw" >/dev/null 2>&1; then

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system doesn't boot. Linux boots with error : 'Cant find KNOPPIX filesystem'

Cheers.

As tablet_guy mentioned, don't do my change as it isn't correct, I was supposed to post the line that tablet_guy mentioned.

For the reasons you have found out, the following will NOT work

Code:

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mountit /dev/cloop /KNOPPIX "-o rw" || FOUND_KNOPPIX=""

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What, if any, boot codes are you using in addition to the defaults?

I just start with 'knoppix'

But I also started only with changes presented by tablet_guy

Code:

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if mountit $i /cdrom "-o rw" >/dev/null 2>&1; then

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It started but, dev/sda1 (the knoppix disk) was still read only.