2015-08-16

[Technology] How to Mount the Overlay Filesystem of a Live USB



So, I
wanted to demonstrate the commands in the previous post used for
resizing my file system, but of course I did that from a live USB (since
I wanted my file systems unmounted). However, I did not want to reboot
my computer just now to copy root's bash history, so I looked up how to
mount the overlay using these instructions:



https://fedoraproject.org/wiki/LiveOS_image



The simplified version would be:




  1. insert USB key into computer

  2. identify it
    $ journalctl --system
    mine was created as /dev/sdc1

  3. mount it, creating target directories as you go:
    # mount /dev/sdc1 /tmp/sdc1

  4. mount the read-only squashed file system:
    # mount /tmp/sdc1/LiveOS/squashfs.img /tmp/squashfs

  5. create a block device for its ext3fs image:
    # losetup /dev/loop1 /tmp/squashfs/LiveOS/ext3fs.img -r

  6. create a block device for the overlay:
    # losetup /dev/loop2 /tmp/sdc1/LiveOS/overlay-LIVE-foo

  7. calculate size of loop1
    # blockdev -q --getsz /dev/loop1mine was 12582912

  8. define a device combining the two
    # dmsetup create myliveos --table "0 12582912 snapshot 7:1 7:2 P 8"
    myliveos: my own name for the device, call it what you will
    12582912: the # of blocks I acquired from step 7, put in yours
    7:1 references loop1
    7:2 references loop2

  9. mount the combined device
    # mount /dev/mapper/myliveos /tmp/myliveos


Now I can cd into /tmp/myliveos, and get my .bash_history!

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