systemimage-builder.yaml

{{- $architecture := or .architecture "arm64" -}}
{{- $image := or .image "ubuntu-touch-system-image.img" -}}
{{- $device := or .device "device unset in systemimage-builder" -}}
{{- $channel := or .channel "channel unset in systemimage-builder" -}}

# Creates a prebuilt system-image capable image

# Looking at this recipe, you may be asking yourself "why is this even a debos
# recipe?"
# That is a very good question.

architecture: {{ $architecture }}
actions:
  - action: run
    description: Mount tmpfs as '/' as far as debos is concerned
    command: mkdir mnt && mount -t tmpfs tmpfs mnt/

  - action: image-partition
    description: Creating image
    imagename: {{ $image }}
    imagesize: 14.6GiB
    partitiontype: gpt
    mountpoints:
      - mountpoint: /cache
        partition: cache

      - mountpoint: /data
        partition: userdata

    partitions:
      - name: loader
        fs: none
        start: 131072B
        end: 2097K

      - name: scr
        fs: none
        start: 2098K
        end: 3146K
        flags: [ legacy_boot ]

      - name: persist
        fs: ext2
        start: 3147K
        end: 11.5M

      - name: boot_a
        fs: none
        start: 11.6M
        end: 78.6M

      - name: boot_b
        fs: none
        start: 78.7M
        end: 146M

      - name: recovery_a
        fs: none
        start: 146M
        end: 213M

      - name: recovery_b
        fs: none
        start: 213M
        end: 280M

      # Future second system partition
      - name: cache
        fs: ext2
        start: 280M
        end: 2840M

      - name: system
        fs: ext4
        start: 2840M
        end: 5400M
        features:
          - "^metadata_csum"

      - name: userdata
        fs: ext4
        start: 5400M
        end: 100%
        features:
          - "^metadata_csum"

  - action: run
    description: Manually set resolver in the container
    chroot: false
    command: mv /etc/resolv.conf /etc/resolv2.conf && echo "nameserver 8.8.8.8" > /etc/resolv.conf

  - action: run
    description: create directory to store ubuntu_command file and installable tarballs
    chroot: false
    command: mkdir mnt/cache/recovery/

  - action: run
    description: Fetches and prepares system image install
    script: scripts/fetch-and-prepare-latest-ota.sh '{{ $channel }}' '{{ $device }}' 'mnt/cache/recovery/'

  - action: run
    description: extract device tarball partitions for writing
    chroot: false
    command: busybox unxz -c mnt/cache/recovery/device-*.tar.xz | tar -xC . partitions/ -f -

    # filesystem is a predefined origin, $scratchdir/root. $filesystem/.. is
    # $scratchdir, where we download files above.
    # It's not pretty, but it works.
  - action: raw
    description: Install recovery partition
    origin: filesystem
    source: ../partitions/recovery.img
    offset: 0
    partition: recovery_a

  - action: run
    description: Mount needed partitions for preinstall
    command: mkdir mnt/recovery && mkdir mnt/system && mount /dev/vda9 mnt/system && mount /dev/vda6 mnt/recovery

  - action: run
    description: Extract initramfs to new root
    command: zcat mnt/recovery/initrd.img | cpio -idmvD mnt/

  - action: run
    description: Place a fake /proc/cmdline
    command: mkdir mnt/proc && echo 'systempart=' > mnt/proc/cmdline

  - action: run
    description: Place a fake /proc/mounts
    command: echo '/dev/vda10 /data nonsensestring' > mnt/proc/mounts

  - action: run
    description: Set up temporary root
    command: mkdir mnt/sbin && mkdir -p mnt/usr/bin && mkdir mnt/dev && mount --bind /dev mnt/dev && chroot mnt/ /bin/busybox --install -s

  - action: run
    description: Place a fake mkfs.ext4
    command: echo '#!/bin/sh\nmke2fs -t ext4 $@' > mnt/bin/mkfs.ext4 && chmod +x mnt/bin/mkfs.ext4

  - action: run
    description: Place a fake mount
    command: rm mnt/bin/mount && echo '#!/bin/sh\nbusybox mount -t ext4 $@' > mnt/bin/mount && chmod +x mnt/bin/mount

  - action: run
    description: Place an fstab
    command: echo '/dev/vda1 /loader none defaults \n/dev/vda2 /scr none defaults \n/dev/vda4 /boot ext2 defaults \n/dev/vda6 /recovery ext2 defaults \n/dev/vda9 /system ext4 defaults' > mnt/etc/recovery.fstab

  - action: run
    description: system-image installation
    command: chroot mnt/ /bin/sh /system-image-upgrader /cache/recovery/ubuntu_command

  - action: run
    description: Unmount all filesystems
    command: umount mnt/*; umount mnt/

  - action: run
    description: zerofill empty space on the system partition to reduce final size
    command: zerofree -v `blkid --match-token PARTLABEL=system --output device`

  - action: run
    description: zerofill empty space on the cache partition to reduce final size
    command: zerofree -v `blkid --match-token PARTLABEL=cache --output device`

  - action: run
    description: Create bmap file
    postprocess: true
    command: bmaptool create {{ $image }} > {{ $image }}.bmap