func main() {
flag.Parse()
// Get the latest timestamp.
t, err := download.Latest()
if err != nil {
log.Fatalln(err)
}
log.Printf("The latest image is at %s.", t)
// Run the first time.
if err := run(t); err != nil {
log.Fatalln(err)
}
// Run this baby repeatedly.
if every > 0 {
ticker := time.NewTicker(time.Duration(every) * time.Second)
for {
// Get the latest timestamp for the second time.
newt, err := download.Latest()
if err != nil {
log.Println(err)
continue // Restart the download.
}
if !newt.Equal(*t) {
t = newt
log.Printf("The latest image is at %s.", newt)
if err := run(t); err != nil {
log.Print(err)
}
}
// Wait until the next tick.
<-ticker.C
}
}
}
func main() {
flag.Parse()
// Start off with a dummy time.
t := time.Unix(0, 0)
// Run the program.
for ticker := time.NewTicker(time.Duration(every) * time.Second); ; <-ticker.C {
// Get the latest timestamp.
newt, err := download.Latest()
if err != nil {
continue // The update server threw an error. Try later.
}
log.Printf("The latest image is at %s.\n", newt)
// Skip if the latest time hasn't changed.
if newt.Equal(t) {
log.Println("The image has not changed. Waiting...")
continue
}
// If it has, run it.
if err = run(newt); err != nil {
log.Println(err)
continue
}
// Everything has succeeded, set the time to the latest image time.
t = *newt
// If we're only running this once, exit.
if once {
break
}
}
}