kindle-run-on-wake.go

// build with env GOOS=linux GOARCH=arm GOARM=5 go build

package main

import (
	"fmt"
	"os"
	"os/exec"
	"github.com/godbus/dbus"
)

func main() {
	if len(os.Args) < 2 || os.Args[1] == "--help" {
		fmt.Fprintln(os.Stderr, "Run a command whenever your Kindle wakes up. ")
		fmt.Fprintf(os.Stderr, "Usage: %s [command to run]\n", os.Args[0])
		fmt.Fprintln(os.Stderr, "If you need special shell functionality like piping, you can use bash -c '[commands to run]'")
		os.Exit(1)
	}

	conn, err := dbus.ConnectSystemBus()
	if err != nil {
		fmt.Fprintln(os.Stderr, "Failed to connect to system bus:", err)
		os.Exit(1)
	}
	defer conn.Close()

	err = conn.AddMatchSignal(
		dbus.WithMatchObjectPath("/default"),
		dbus.WithMatchInterface("com.lab126.powerd"),
		dbus.WithMatchMember("outOfScreenSaver"),

		//test locally with dbus-send --system /org/freedesktop/DBus/test org.freedesktop.DBus.test string:'this is a test'
		//dbus.WithMatchObjectPath("/org/freedesktop/DBus/test"),
	)
	if err != nil { panic(err) }

	c := make(chan *dbus.Signal, 10)
	conn.Signal(c)

	for range c {
		fmt.Println("Running", os.Args[1:])
		err := exec.Command(os.Args[1], os.Args[2:]...).Run()
		if err != nil { fmt.Fprintln(os.Stderr, "The command exited with an error:", err) }
	}
}