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(Created page with "DISCLAIMER: This can potentially wreck your Linux installation so use it at your own risk! == creating chroot with obs == === Prerequisites === first you need to setup a projec…")
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== creating chroot with obs ==
== creating chroot with obs ==
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Please note that most likely you don't need to do this and instead you want to do
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osc chroot [target]
=== Prerequisites ===
=== Prerequisites ===
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=== Exit the chroot ===
=== Exit the chroot ===
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When you're done hacking inside the chroot type 'exit' to exit it and the script will unmount the mount things from it.
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When you're done hacking inside the chroot type 'exit' to exit it and the script will unmount the mounted things from it.
=== Removing the chroot directory ===
=== Removing the chroot directory ===

Latest revision as of 07:33, 28 January 2011

DISCLAIMER: This can potentially wreck your Linux installation so use it at your own risk!

Contents

creating chroot with obs

Please note that most likely you don't need to do this and instead you want to do 

osc chroot [target]

Prerequisites

first you need to setup a project with a build target that you want to use as the chroot (e.g. Trunk:Testing ia23).

After you have created the OBS project, create a "dummy" spec file. It can be something like this: 

Name:       test
Summary:    Test yaml
Version:    0.0.1
Release:    0
Group:      Applications/Multimedia
License:    GPL
Source100:  test.yaml
BuildRequires: nano
BuildRequires: zypper
BuildRequires: wget
BuildRequires: openssh-clients

%description
Testing

%prep

%build

%install
rm -rf %{buildroot}

%files
%defattr(-,root,root,-)

build it

Check out your OBS project and trigger a local build for you target 

osc co home:[your_username]
cd [your-dummy-package]
osc build --no-verify [target]

copy the build root e.g. to your home directory 

sudo cp /var/tmp/build-root my-chroot

At this point you have the chroot but you still need to mount and chroot into it..

Mounting and chrooting

Create the following script that handles the mounts and unmounts. 

     # enter-chroot.sh
     #!/bin/bash
     bindpath=$PWD/$1
      
     echo "Mounting the directories..."
     mount -o bind /proc $bindpath/proc
     mount -o bind /proc/sys/fs/binfmt_misc $bindpath/proc/sys/fs/binfmt_misc
     mount -o bind /sys $bindpath/sys
     mount -o bind /dev $bindpath/dev
     mount -o bind /dev/pts $bindpath/dev/pts
     mount -o bind /dev/shm $bindpath/dev/shm
     mount -o bind /var/lib/dbus $bindpath/var/lib/dbus
     mount -o bind /var/run/dbus $bindpath/var/run/dbus
     mkdir -p $bindpath/parentroot
     mount -o bind / $bindpath/parentroot
     mkdir -p $bindpath/lib/modules/`uname -r`
     mount -o bind /lib/modules/`uname -r` $bindpath/lib/modules/`uname -r`
      
     cp /etc/resolv.conf $bindpath/etc/resolv.conf

     echo "Entering chroot"
     chroot $bindpath

     echo "Unmounting the directories..."
     umount $bindpath/lib/modules/`uname -r`
     umount $bindpath/parentroot
     umount $bindpath/var/run/dbus
     umount $bindpath/var/lib/dbus
     umount $bindpath/dev/shm
     umount $bindpath/dev/pts
     umount $bindpath/dev
     umount $bindpath/sys
     umount $bindpath/proc/sys/fs/binfmt_misc
     umount $bindpath/proc
     echo "Done."

enter the chroot

Use the script to enter the chroot 

sudo ./enter-chroot.sh my-chroot

Exit the chroot

When you're done hacking inside the chroot type 'exit' to exit it and the script will unmount the mounted things from it.

Removing the chroot directory

If you decide to 'rm -rf' the chroot directory make sure that anything is not mounted to it since you can destroy your linux installation by removing it when something is mounted.

check if something is mounted there be 

mount

if the print from the command contains paths pointing to the chroot directory umount it them before removing the chroot directory or you will find yourself reinstalling your system.

Retrieved from "http://wiki.meego.com/User:Timoph"
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