View source for Chroot build environment

Working on this as I build a new virtual machine for semi-automated Linux and Windows builds.

= Chroot =

Our "weekly" builds are done in a virtual machine with a chroot prison for 32 and 64 bit builds and wine for the Windows build. Here I document step by step how to set one up. I write this as I go, so it is incomplete.

Make snapshots after every section or so.

== Base system ==

Install Ubuntu Trusty in a virtual machine. Straightforward :) Pick LVM in the setup options so you can resize partitions later.

Install bzr and (optinal, I use it for remote access) ssh and stuff:
 sudo apt-get update
 sudo apt-get install bzr ssh schroot

== Add common volume to host builds ==

Edit: These steps are provided as is because I set my system up that way. They're not required. /mnt/builds on the root system side can be any old directory.

Use LVM to add a new volume. My VM has 150 G total space:
 lvcreate -L 100G -n builds ubuntu-vg
 mkfs.ext4 /dev/ubuntu-vg/builds
If there is not enough space, reduce existing volumes. This needs to be done from a Live CD:
 resize2fs /dev/ubuntu-vg/root 50G
 lvresize /dev/ubuntu-vg/root 50G

Add the new volume to fstab:
 /dev/mapper/ubuntu--vg-builds /mnt/builds  ext4    errors=remount-ro 0       1

This new volume will be mounted into the chroots for easy access.

== Set up chroot environments ==
 
Follow this documentation: [https://wiki.ubuntu.com/DebootstrapChroot]
You can stop before "Setting up a dchroot (non-root) environment"

Our /etc/schroot/schroot.conf:
 [64]
 description=Ubuntu 64 Bit
 location=/var/chroot/64
 priority=3
 users=manuel
 groups=sbuild,root
 root-groups=root

 [32]
 description=Ubuntu 32 Bit
 location=/var/chroot/32
 priority=3
 users=manuel
 groups=sbuild,root
 root-groups=root
 personality=linux32
 aliases=dokochroot,default


Creating the actual installations:
 debootstrap --variant=buildd --arch i386 trusty /var/chroot/32 http://archive.ubuntu.com/ubuntu/
 debootstrap --variant=buildd --arch amd64 trusty /var/chroot/64 http://archive.ubuntu.com/ubuntu/

To change into the new environments, you can do "schroot -c 32" or "schroot -c 64".

Create mount points for the shared files in the chroots:
 mkdir /var/chroot/32/mnt/builds
 mkdir /var/chroot/64/mnt/builds

Add bind mounts for them into /etc/fstab:
 /mnt/builds /var/chroot/32/mnt/builds none bind
 /mnt/builds /var/chroot/64/mnt/builds none bind

Mount them with "mount -a". Inside the chroots, you should now see /mnt/build.