Failing typo in Extroot configuration

Hi all, I don't have write access to the wiki, but I'd like to get a modification done that is failing the procedure.


eval $(block info ${DEVICE} | grep -o -e 'UUID="\S*"')


eval $(block info ${USBDEVICE} | grep -o -e 'UUID="\S*"')


mount ${DEVICE} /mnt
tar -C ${MOUNT} -cvf - . | tar -C /mnt -xf -


mount ${USBDEVICE} /mnt
tar -C ${MOUNT} -cvf - . | tar -C /mnt -xf -

Can you elaborate as to why you think this change should be made? Specifically, DEVICE is just a variable name (defined in the first line of code in section 2 of the page you linked). Changing this to USBDEVICE should have no effect (positive or negative)... unless I'm missing something?

When I run the following line of code:

DEVICE="$(block info | sed -n -e '/MOUNT="\S*\/overlay"/s/:\s.*$//p')"

I end up with valid output:

root@openwrt:~# echo $DEVICE

I guess it works for you because you have already implemented extroot. For the virgin device, DEVICE is /dev/ubi0_1 and USBDEVICE is /dev/sda1

Gottcha. I wonder if this issue is specific to UBI devices... it may not impact others. This would need a bit of checking. The other question would be if there is ever a situation where the DEVICE variable would be different than USBDEVICE and thus important for the functioning of the script.

my device is WRT1900ACv2, and the current version of the doc would make me reboot with a weird setting, lucky I've double checked

# block info
/dev/ubiblock0_0: UUID="80a00b43-db031c31-63d845ef-5891455e" VERSION="4.0" MOUNT="/rom" TYPE="squashfs"
/dev/ubi0_1: UUID="7080715f-ae28-48bc-afb4-09d5b040ee5d" VERSION="w5r0" MOUNT="/overlay" TYPE="ubifs"
/dev/ubi1_0: UUID="5ed23499-15d0-4097-a301-28867bbdf15b" VERSION="w4r0" TYPE="ubifs"
/dev/sda1: UUID="b2d5064c-a275-4dfb-9c0d-d8a471552118" LABEL="extroot" VERSION="1.0" TYPE="ext4"
# mount ${DEVICE} /mnt
mount: mounting /dev/ubi0_1 on /mnt failed: Block device required
# block info ${DEVICE} | grep -o -e 'UUID="\S*"'
--> Empty
# block info | sed -n -e '/MOUNT="\S*\/overlay"/s/:\s.*$//p'

The documentation has been updated.