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USB mounts squashfs partition, need to make changes to file (write to squashfs)

Posted on 2014-10-04
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Last Modified: 2014-10-04
hi

i have a usb stick that has several partitions on it.

one if them is squashfs.

when i attach the usb stick it gets mounted automatically as /dev/sdc7

now i need to make changes to one of the files in the squasfs partition

how can I do that (as it not possible to directly mount or remount squashfs as rw)

thanks
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Question by:netslt
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6 Comments
 
LVL 62

Expert Comment

by:gheist
ID: 40361289
squashfs is read-only by design
you must mount it, then copy everything with permissions to better place
and re-create new squashfs.
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Author Comment

by:netslt
ID: 40361334
i know it is r only, i am looking for a workaround....

so when i copy all the files drom the partition, make changes and create the squashfs again - how do i replace the existing partition with the new squashfs file?

i see no "file" on the stick - so how exactly do i have to proceed?

thanks again
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LVL 62

Expert Comment

by:gheist
ID: 40361354
You need to use "dd" command to transfer squashfs file to (not mounted) disk partition
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Author Comment

by:netslt
ID: 40361559
can you pls explain more in detail or give me sample for the commands necessary?

thanks
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LVL 62

Accepted Solution

by:
gheist earned 500 total points
ID: 40361574
It is a single command... There is nothing to detail
mkdir whatever
cd whatever
unsquashfs /dev/sdb4
(do your changes)
mksquashfs squash.new .
dd if=squash.new of=/dev/sdb4
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Author Comment

by:netslt
ID: 40361710
I'll try that - thank you very much
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