Make swarming bootstrap at boot, not login

skolo/raspberry-pi/finalize_image.yml

 ---
 - hosts: 127.0.0.1
   connection: local
   remote_user: chrome-bot
   become_user: root
   become: yes
   become_method: sudo
   vars:
     image: /opt/rpi_img/2016-03-18-raspbian-jessie-lite.img
     # 8192 * 512
     offset_boot: 4194304
     # 131072 * 512
     offset_root: 67108864
   tasks:
     # Set up mounts in image's fstab
     - lineinfile: dest=/opt/raspberrypi/root/etc/fstab regexp=".*mmcblk0p2.*" state=absent
     - lineinfile: dest=/opt/raspberrypi/root/etc/fstab line="/dev/mmcblk0p3  /b     ext4    defaults          0       2" state=present
     - lineinfile: dest=/opt/raspberrypi/root/etc/fstab line="/dev/mmcblk0p5  /var   ext4    defaults          0       2" state=present
     - lineinfile: dest=/opt/raspberrypi/root/etc/fstab line="/dev/mmcblk0p6  /tmp   ext4    defaults          0       2" state=present
     - lineinfile: dest=/opt/raspberrypi/root/etc/fstab line="/dev/mmcblk0p7  /home/chrome-bot   ext4    defaults          0       2" state=present
 
     # Swarming needs a /b file (which will have an SD card partition mounted to it.)
     - file: path=/opt/raspberrypi/root/b state=directory mode=0777
     # Make the hostname be set from the cmdline, not etc/hostname
     - file: path=/opt/raspberrypi/root/etc/hostname state=absent
     # Autologin to our user
     - lineinfile: dest=/opt/raspberrypi/root/lib/systemd/system/getty@.service regexp="^ExecStart.*" state=absent
     - lineinfile: dest=/opt/raspberrypi/root/lib/systemd/system/getty@.service line="ExecStart=-/sbin/agetty --autologin chrome-bot --noclear %I $TERM" state=present insertafter="\[Service\]"
 
-    - name: Create the startup script
-      copy: src=startup-script.sh dest=/opt/raspberrypi/root/opt/startup-script.sh owner=root group=root mode=0755
-
-    - name: Set to run our startup script at boot
-      lineinfile: dest=/opt/raspberrypi/root/home/chrome-bot line="/opt/startup-script.sh" insertafter=EOF
-
     - name: Fixing udev rules for Android and NVIDIA devices
       copy: src=udev-rules dest=/opt/raspberrypi/root/etc/udev/rules.d/51-android.rules owner=root group=root mode=0644
 
    # Some niceties
     - lineinfile: dest=/opt/raspberrypi/root/etc/profile line="alias l='ls -CF'" state=present
     - lineinfile: dest=/opt/raspberrypi/root/etc/profile line="alias la='ls -A'" state=present
     - lineinfile: dest=/opt/raspberrypi/root/etc/profile line="alias ll='ls -alF'" state=present
     - lineinfile: dest=/opt/raspberrypi/root/etc/profile line="alias ls='ls --color=auto'" state=present
 
 
     - lineinfile: dest=/opt/raspberrypi/root/etc/ld.so.preload line="#/usr/lib/arm-linux-gnueabihf/libarmmem.so" state=absent
     - lineinfile: dest=/opt/raspberrypi/root/etc/ld.so.preload line="/usr/lib/arm-linux-gnueabihf/libarmmem.so" state=present
 
+    # With these unmounted, chroot not work anymore.  To make chroot work
+    # again, run the setup_for_chroot playbook.
     - command: umount /opt/raspberrypi/root/dev
+      ignore_errors: true
     - command: umount /opt/raspberrypi/root/proc
+      ignore_errors: true
     - command: umount /opt/raspberrypi/root/sys
+      ignore_errors: true
 
     - mount: name="/opt/raspberrypi/root" src="dontcare" fstype="auto" state="unmounted"
   handlers: