Cancel upon watchInterval == 0

Signed-off-by: Du Zheng <zsuzhengdu@gmail.com>

pkg/reloader/reloader.go

@@ -91,7 +91,6 @@ type Reloader struct {
 	retryInterval time.Duration
 	watchedDirs   []string
 	watcher       *watcher
-	oneOff        bool
 
 	lastCfgHash         []byte
 	lastWatchedDirsHash []byte
@@ -115,7 +114,6 @@ type Options struct {
 	CfgOutputFile string
 	// WatchedDirs is a collection of paths for the reloader to watch over.
 	WatchedDirs []string
-	OneOff      bool
 	// DelayInterval controls how long the reloader will wait without receiving
 	// new file-system events before it applies the reload.
 	DelayInterval time.Duration
@@ -140,7 +138,6 @@ func New(logger log.Logger, reg prometheus.Registerer, o *Options) *Reloader {
 		cfgFile:       o.CfgFile,
 		cfgOutputFile: o.CfgOutputFile,
 		watcher:       newWatcher(logger, reg, o.DelayInterval),
-		oneOff:        o.OneOff,
 		watchedDirs:   o.WatchedDirs,
 		watchInterval: o.WatchInterval,
 		retryInterval: o.RetryInterval,
@@ -295,7 +292,7 @@ func (r *Reloader) apply(ctx context.Context) error {
 				return errors.Wrap(err, "rename file")
 			}
 
-			if r.oneOff {
+			if r.watchInterval == 0 {
 				<-ctx.Done()
 				return nil
 			}