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ubuntu-usb-merge

Automating merging the read-write filesystem on Ubuntu USB back into the read-only part with a quick bash script.

The process is described in my blog post here http://davstott.me.uk/index.php/2013/09/05/ubuntu-13-04-on-a-usb-flash-drive-and-merging-its-persistent-storage/ and whilst this process and script works for me, there are very few safety checks in it, so running this script as root might very well delete all of your data and run over the neighbours cat.

Please be extra careful and take backups before you start.

At the moment, it requires that mksquashfs be installed, which can be done with sudo apt-get install squashfs-tools

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ubuntu-usb-merge's Issues

Ubuntu 14.04.3 LTS - 'upperdir' option for overlay mounting should be 'readwrite/upper'

The existing version of ubuntu-usb-merge hasn't worked for me when I tried with Ubuntu 14.04.3 LTS workstation image.

The casper-rw content is slightly different, and the overlay contents appear in a directory 'upper'.

# mount
/var/tmp/usblive/casper-rw on /var/tmp/usblive/readwrite type ext3 (rw)

# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/loop0      3.9G  762M  3.0G  21% /var/tmp/usblive/readwrite

# ls readwrite/
format  lost+found  upper  work

# ls readwrite/upper
boot  cdrom  etc  home  lib  media  rofs  sbin  tmp  usr  var

So, the overlay mount works only with a slight modification to the original command. The upperdir option needs to be taken down a level inside

# mount none merged -o lowerdir=readonly,upperdir=readwrite/upper -t overlayfs

`

Mounting overlayfs error 

patrick@DESKTOP:~/Documents$ sudo ./merge.sh /media/patrick/UBUNTU

Mounting /media/patrick/UBUNTU/casper/filesystem.squashfs
Mounting /media/patrick/UBUNTU/casper-rw
Mounting overlayfs
mount: wrong fs type, bad option, bad superblock on none,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

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