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Build chroot environment on Debian

Posted at — Sep 22, 2009

Reference:

http://www.debian-administration.org/articles/356

http://alioth.debian.org/docman/view.php/30192/21/debian-amd64-howto.html#id292205

The architecture is amd64, so some 32-bit applications could not work well, even with ia32 libs. One solution is to build 32-bit chroot environment. Not only for 32-bit, of course.

Follow the official tutorial.

make a directory to place the new system.

sid is the version, and /chroot is the directory created just now, and the mirror URL follows. Change the i386 into any architecture you like, e.g., amd64.

run ‘mount -a’ to mount. And other directories like $HOME can be mounted as you like.

Now, we can use

sudo chroot /chroot

to change the environment into /chroot

schroot is a more powerful tool to chroot.

sudo apt-get install schroot
sudo vi /etc/schroot/schroot.conf

uncomment the first part. change the users, groups, root-groups to your own.

now sudo is not needed any more.

There is a parameter, ‘-p’, which introduces the environment vars of the external system, while I prefer to configure the env vars myself.

Problems

The system should know which display to show the window. It prompts

unable to open display ""

So

export DISPLAY=":0.0"

sometimes it doesn’t work, please try

export DISPLAY="0:0"

I don’t know the reason, but it actually works on mine.

Then run

sudo gdmsetup

uncheck ‘Deny TCP connections to Xserver’ on the ‘Security’ tab.

add

xhost +localhost

to $HOME/.profile to make sure localhost is permitted to use X.

all files’ name should be put in /etc/schroot/copyfiles-defaults, extra files, like .vimrc, .bashrc, can be added on demand. Add

run-setup-scripts=true
run-exec-scripts=true

to schroot.conf. So that schroot will deal with the file copying, mounting, proc killing when logout, and so on.

All the scripts are located in /etc/schroot.ap

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