CrOS Factory: Init system

The init folder contains configurations to change ChromeOS boot flow into factory-ready environment.

The goal is to start UI (Chrome) in Kiosk mode, and browsing factory web UI port on default. And the real flow is:

  1. This folder should be copied into /mnt/stateful_partition as path dev_image/factory/init, and mounted at /usr/local/factory/init.

  2. /etc/init/factory-init.conf must be executed when starting boot-services.conf (before UI is started), then calls factory/init/startup.

  3. factory/init/startup will deal with the install request (if exists) first. The script probes the request file called install in the same directory, if it exists and is not empty, the script reads the content from the request file (should be a path pointing to the factory toolkit file) and install the factory toolkit. See Delayed Installation for more info.

  4. factory/init/startup will apply any rules in its sub folders, for example, binding a customized /etc/chrome_dev.conf (which will be parsed by Chrome session manager and applied for startup in ui.conf).

  5. When factory.conf starts, it will invoke factory/init/startup main which loads rules from main.d. By default this should start Goofy UI, but it may also be customized to start other services like Whale.

Now, when everything is set, we will have a new and unified boot flow:

(upstart) startup -> [chromeos_startup] -> (upstart) boot_services ->
(upstart) factory-init -> [factory/init/startup init] ->
(upstart) factory -> [factory/init/startup main] -> [goofy_control start] ->
(upstart) ui (Chrome) -> [goofy] ->
[emit login-prompt-visible] -> (upstart) other system services ...

And when developers run factory_restart, it brings up these services in same flow (first factory then chrome).

See main.d/ for more information of how to add (also enable or disable) new rules into each stage.

  • common.d: Rules applied on all systems in system init.
  • iptables.d: Rules applied for network setup.
  • goofy.d: Rules applied according to factory configuration (run presenter, device, or monolithic mode).
  • main.d: Rules applied for factory main service (factory.conf).

Delayed Installation

During the reimaging stage, the DUT downloads a test image and a factory toolkit to the local storage. The DUT is responsible for installing the toolkit itself afterward. But in that stage, the DUT (running factory shim or factory netboot installer) lacks of python to finish essential works for installing the factory toolkit. It can only extract the toolkit file but not install. We have to delay this work until the first boot using test image environment.

This is the reason we must deal with the install request at the beginning of the init process.