A guide to create a chroot environment from an Ubuntu iso on Ubuntu

chroot_from_iso.txt

# download ubuntu iso

The iso version should be lower/equal than/to the host version.

# install uck (ubuntu customization kit)

run:
	sudo apt-get install uck

# setup chroot environment from iso

run:
	export BASEDIR=/path/to/chroot/directory

	sudo uck-remaster-unpack-iso /path/to/the/image.iso "$BASEDIR" && sudo uck-remaster-unpack-rootfs "$BASEDIR" && sudo uck-remaster-unpack-initrd "$BASEDIR"

# enter chroot environment

run:
	sudo uck-remaster-chroot-rootfs /path/to/chroot/directory/

# run GUI app inside chroot environment

before enter chroot environment, run:

	xhost +

inside chroot environment, run:

	export DISPLAY=:0

# access a directory from chroot environment

run:
	mount --bind /path/to/host/directory /path/to/directory/inside/chroot

ex:
	mount --bind ~/work/docs ~/work/devenv/doanything/remaster-root/root/docs

after exit chroot environment, should run:

	umount /path/to/directory/inside/chroot

# write files from outside chroot environment

run:
	sudo chmod g+w -R /path/to/chroot/directory/remaster-root/
	sudo chmod g+w -R /path/to/chroot/directory/remaster-root-home/

# replace app host with a faster one

inside chroot environment, edit:
	/etc/apt/sources.list

replace the current host with the host get from:
	https://launchpad.net/ubuntu/+mirror/free.nchc.org.tw-archive

the complete host list can get from:
	https://launchpad.net/ubuntu/+archivemirrors

# references

https://help.ubuntu.com/community/DebootstrapChroot
http://www.thegeekstuff.com/2010/06/xhost-cannot-open-display/
https://help.ubuntu.com/community/FilePermissions