nano: no write permission

[Dirk2718]

Hallo!

I installed the extend tools successfully. Now I want to edit the file "/usr/share/webkit-1.0/pillow/debug_cmds.json" with the nano editor. But I have no write permission on this file, although my permissions for this file are "-rw-r--r-- 1 root root 1567 Apr 5 05:01 debug_cmds.json". So I think I should have read and write permission. Why I´m unable to edit this file?

Thank you and best regards
Dirk

[knc1]

Originally Posted by Dirk2718

Hallo!

I installed the extend tools successfully. Now I want to edit the file "/usr/share/webkit-1.0/pillow/debug_cmds.json" with the nano editor. But I have no write permission on this file, although my permissions for this file are "-rw-r--r-- 1 root root 1567 Apr 5 05:01 debug_cmds.json". So I think I should have read and write permission. Why I´m unable to edit this file?

Thank you and best regards
Dirk

Is the filesystem mounted read-only?
That would prevent you from writing to any file in that filesystem.

[Dirk2718]

I mounted it. When I try to unmount it, I get:

[root@kindle pillow]# /mnt/us/extend/unmount.sh
ioctl: LOOP_CLR_FD: Device or resource busy
ioctl: LOOP_CLR_FD: Device or resource busy
ioctl: LOOP_CLR_FD: Device or resource busy
ioctl: LOOP_CLR_FD: Device or resource busy
ioctl: LOOP_CLR_FD: Device or resource busy

But how do I call an option to mount it read-only or writable?

Best regards
Dirk

[Zema]

Try command

mntroot rw

[hawhill]

it's the "ro" or "rw" mount options (typically, that is). I didn't bother to look deeper into the extend scripts, but typically, you
- check how partitions are mounted by looking in /proc/mounts (cat /proc/mounts),
- remount a partition read/write that is already mounted read-only: mount -o remount,rw /dev/... /mnt/...

[Dirk2718]

Originally Posted by Zema

Try command

mntroot rw

Thank you! That works.

[knc1]

Is this machine the one described in your user information block? (KT-v5.1.0)
I don't own one of those myself, but ...

I often see the use of a non-standard command in the various de-bricking and modification threads.
As if there exists something that takes care of all the details for a user.
You could browse those threads for how to spell and use it. I don't trust my memory enough about it to mis-quote its use here.

But as a general note -
You don't have to umount/mount a file system to change ro/rw or rw/ro
There is an option for that "mount -o remount,rw ..." or "mount -o remount,ro ..."

And a note to all readers:
The man(ual) command is your friend. If you don't have a Linux (or any *nix) system with the documentation installed, google knows it also:
google: man mount

EDIT:
I see that two members beat me to it, giving you the exact, Kindle specific, details.
Too bad we can't delete these posts ourselves... Oh, well...

[Dirk2718]

Yes it is the KT with OTA 5.1.0.

After I read the command from Zema, I restarted putty and at the top a big notice field appears, which I obviously missed the first time. This field even contains the info to switch to writable with "mntroot rw".

Sorry and thanks!