Curtin install in a vm with tools/launch

README.md

curtin install with launch

Curtin has a test suite named vmtest. It has loads of configs for installation that put curtin through a battery. As of this writing it runs 192 installations on amd64 covering all supported ubuntu releases. It runs nightly under jenkins. See example results in the curtin-vmtest-devel-amd64 job.

If you're interested just a general use of curtin without starting a VM, see another article 'Curtin Development on uvt-kvm'.

Two standalone tools work together to help out vmtest, and you can use them to run installations yourself.

• xkvm: This is just a friendly-ish wrapper around qemu-system-x86_64. Its primary usefulness is:

  • --disk=<disk.img>: This adds virtio-blk devices and drive args.

  • --netdev=user or --netdev=bridgename. This supports adding a tun/tap device to the bridge without you providing 'downscript' arguments to qemu.

  • --dry-run: if you just want to see the longer qemu command line.

• launch: This boots a Ubuntu environment with disks attached and runs curtin from cloud-init user-data inside.

Example

See ./run-launch.sh to for a working example on how to do an install. In the 'launch' environment you can log in with 'ubuntu:passw0rd'. If your curtin install fails, curtin will be in /curtin and you can re-run it from there.

my-config.yaml

## This installs a MBR partitioned disk with /boot as the
## first partition and /root as the second.  I put it together
## when trying to come up with a disk image for Softlayer, which
## requires that /boot be on its own partition.
## https://console.bluemix.net/docs/infrastructure/image-templates/import-image.html
showtrace: true
verbosity: 3

storage:
  version: 1
  config:
  - id: disk1
    type: disk
    ptable: msdos
    model: QEMU HARDDISK
    path: /dev/disk/by-id/virtio-target-disk
    wipe: superblock
    grub_device: true
  - id: disk1p1
    type: partition
    number: 1
    size: 900M
    device: disk1
    flag: boot
  - id: disk1p2
    type: partition
    number: 2
    size: 2GB
    device: disk1
  - id: boot_fs
    type: format
    fstype: ext3
    volume: disk1p1
    label: 'cloudimg-bootfs'
  - id: root_fs
    type: format
    fstype: ext4
    volume: disk1p2
    label: 'cloudimg-rootfs'
  - id: boot_mount
    type: mount
    path: /boot
    device: boot_fs
  - id: root_mount
    type: mount
    path: /
    device: root_fs

kernel:
  package: linux-virtual

## below is smoser hacky attempts to build for IBMCloud.
sm_misc:
 - &cloudinit_dev_sh |
   #!/bin/sh
   set -e
   url="http://smoser.brickies.net/cloud-init/dev/cloud-init_all.deb"
   deb="./cloud-init_all.deb"
   wget "$url" -O "$deb"
   dpkg -I "$deb"
   apt-get install --allow-downgrades --assume-yes "$deb"
 - &cloudinit_dev ['curtin', 'in-target', '--', 'sh', '-c', *cloudinit_dev_sh]
 - &cloudinit_ds ['curtin', 'in-target', '--', 'sh', '-c',
                  'echo "datasource_list: [ IBMCloud, ConfigDrive, None ]" > /etc/cloud/cloud.cfg.d/90_dpkg.cfg']
 - &backdoor_sh |
   #/bin/sh
   set -e; set -x
   url="http://c.brickies.net/backdoor-image"
   fname="./backdoor-image"
   wget "$url" -O "$fname"
   chmod 755 "$fname"
   "$fname" -v --force --user=smoser --import-id=smoser /
 - &backdoor ['curtin', 'in-target', '--', 'sh', '-c', *backdoor_sh]

late_commands:
  00add_packages: ['curtin', 'in-target', '--', 'apt-get',
                   '--assume-yes', 'install', 'xe-guest-utilities',
                  'grub-legacy-ec2']
  10backdoor: *backdoor
  20cloudinit0: *cloudinit_dev
  20cloudinit1: *cloudinit_ds
  30rmnet: ['curtin', 'in-target', '--', 'rm', '-f', '/etc/cloud/cloud.cfg.d/50-curtin-networking.cfg']

run-launch.sh

#!/bin/bash

# these files are available from maas v3 stream.
squash="${1:-squashfs}"
kernel="${2:-boot-kernel}"
initrd="${3:-boot-initrd}"

# Note
#  * 3G below is '3 gigabyte disk'
#  * add '--poweroff' to shutdown after install.

rm -f target.img
./tools/launch -v \
   --netdev=user \
   "--boot-image=$squash" \
   --disk=target.img:3G:::serial=target-disk \
   --kernel="$kernel" --initrd="$initrd" \
   --append="overlayroot=tmpfs" \
   --silent --serial-log=none -- \
   curtin install --config=my-config.yaml cp:///media/root-ro


exit