add signal 'snapshot', rename existing signal 'wakeup' to 'replication'

daemon/snapper/snapper.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/pkg/errors"
 
+	"github.com/zrepl/zrepl/daemon/job/dosnapshot"
 	"github.com/zrepl/zrepl/daemon/logging/trace"
 
 	"github.com/zrepl/zrepl/config"
@@ -210,6 +211,10 @@ func syncUp(a args, u updater) state {
 		return u(func(s *Snapper) {
 			s.state = Planning
 		}).sf()
+	case <-dosnapshot.Wait(a.ctx):
+		return u(func(s *Snapper) {
+			s.state = Planning
+		}).sf()
 	case <-a.ctx.Done():
 		return onMainCtxDone(a.ctx, u)
 	}
@@ -378,6 +383,10 @@ func wait(a args, u updater) state {
 		return u(func(snapper *Snapper) {
 			snapper.state = Planning
 		}).sf()
+	case <-dosnapshot.Wait(a.ctx):
+		return u(func(snapper *Snapper) {
+			snapper.state = Planning
+		}).sf()
 	case <-a.ctx.Done():
 		return onMainCtxDone(a.ctx, u)
 	}

daemon/snapper/snapper_all.go

@@ -18,9 +18,9 @@ type PeriodicOrManual struct {
 	s *Snapper
 }
 
-func (s *PeriodicOrManual) Run(ctx context.Context, wakeUpCommon chan<- struct{}) {
+func (s *PeriodicOrManual) Run(ctx context.Context, replicationCommon chan<- struct{}) {
 	if s.s != nil {
-		s.s.Run(ctx, wakeUpCommon)
+		s.s.Run(ctx, replicationCommon)
 	}
 }