Android System Programming

Actions

The action syntax is as follows:

on <trigger>     <command>     <command>     <command>     ... 

Actions begin with the keyword on, followed by a trigger. Actions are left-aligned and the commands that follow are indented, as shown in the preceding snippet.

For example, we mount all partitions for the emulator using fstab.goldfish on trigger fs:

on fs         mount_all /fstab.goldfish 

Triggers are strings that can be used to match certain kinds of event and they are used to cause an action to occur. There are two types of action triggers: predefined triggers and triggers activated on property-value changes.

Predefined triggers could be early-init, init, early-fs, fs, post-fs, early-boot, or boot as defined in the init scripts.

Property-value triggers ...