fuse-device-plugin/src/main.go

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package main
import (
"flag"
"log"
"os"
"syscall"
"github.com/fsnotify/fsnotify"
pluginapi "k8s.io/kubelet/pkg/apis/deviceplugin/v1beta1"
)
func main() {
var (
mountsAllowed = 5
)
flag.IntVar(&mountsAllowed, "mounts_allowed", 5, "maximum times the fuse device can be mounted")
flag.Parse()
log.Println("Starting")
defer func() { log.Println("Stopped:") }()
log.Println("Starting FS watcher.")
watcher, err := newFSWatcher(pluginapi.DevicePluginPath)
if err != nil {
log.Println("Failed to created FS watcher.")
os.Exit(1)
}
defer watcher.Close()
log.Println("Starting OS watcher.")
sigs := newOSWatcher(syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
restart := true
var devicePlugin *FuseDevicePlugin
L:
for {
if restart {
if devicePlugin != nil {
if err := devicePlugin.Stop(); err != nil {
log.Printf("Failed to stop plugin: %+v", err)
}
}
log.Printf("Max device count: %d", mountsAllowed)
devicePlugin = NewFuseDevicePlugin(mountsAllowed)
if err := devicePlugin.Serve(); err != nil {
log.Println("Could not contact Kubelet, retrying. Did you enable the device plugin feature gate?")
} else {
restart = false
}
}
select {
case event := <-watcher.Events:
if event.Name == pluginapi.KubeletSocket && event.Op&fsnotify.Create == fsnotify.Create {
log.Printf("Inotify: %s created, restarting.", pluginapi.KubeletSocket)
restart = true
}
case err := <-watcher.Errors:
log.Printf("Inotify: %s", err)
case s := <-sigs:
switch s {
case syscall.SIGHUP:
log.Println("Received SIGHUP, restarting.")
restart = true
default:
log.Printf("Received signal \"%v\", shutting down.", s)
if err := devicePlugin.Stop(); err != nil {
log.Printf("Failed to stop plugin: %+v", err)
}
break L
}
}
}
}