skolo/raspberry-pi/start_serving_image.yml

---
- hosts: all
  connection: local
  remote_user: chrome-bot
  become_user: root
  become: yes
  become_method: sudo
  vars:
    net: 192.168.1.0
    # override with --extra-vars "nfs_mount_point=/opt/stage"
    nfs_mount_point: /opt/prod
    # override with --extra-vars "image=/opt/rpi_img/stage.img"
    image: /opt/rpi_img/prod.img
    # 8192 * 512
    offset_boot: 4194304
    # 131072 * 512
    offset_root: 67108864
    # 122880 * 512
    sizelimit_boot: 62914560
    # 4624384 * 512
    sizelimit_root: 2367684608
    fsid: "2"
  tasks:
    - set_fact:
        fsid: "1"
      when: nfs_mount_point == "/opt/prod"

    - file: path={{nfs_mount_point}}/boot state=directory
    - file: path={{nfs_mount_point}}/root state=directory

    - mount: src="{{image}}" name="{{nfs_mount_point}}/boot" fstype="auto" opts="loop,offset={{offset_boot}},sizelimit={{sizelimit_boot}},noauto" state="mounted"
    - mount: src="{{image}}" name="{{nfs_mount_point}}/root" fstype="auto" opts="loop,offset={{offset_root}},sizelimit={{sizelimit_root}},noauto" state="mounted"

    # start nfs
    - service: name=nfs-kernel-server state=restarted

    # make sure root stays mounted
    - lineinfile: dest=/etc/cron.d/opt_raspberrypi_root line="* * * * * root /bin/mount {{nfs_mount_point}}/root" create=yes state=present

    # Remount these at startup
    - lineinfile: dest=/etc/rc.local line="mount {{nfs_mount_point}}/root" insertbefore="exit 0" create=yes
    - lineinfile: dest=/etc/rc.local line="mount {{nfs_mount_point}}/boot" insertbefore="exit 0" create=yes

    # It is very important to specify different fsids for the prod and staging mounts.
    # It seems that if this is not done, both directories end up with the same fsid, which
    # means they are indistinguishable to any nfs client and thus all RPIs will attach
    # to the first nfs rule.
    - name: make prod nfs sharing rule
      lineinfile: dest=/etc/exports line="{{nfs_mount_point}}/root {{net}}/24(ro,sync,no_root_squash,no_subtree_check,fsid={{fsid}})"