zfs.NilBool: document its purpose and move it to its own package 'nodefault'

daemon/job/build_jobs_sendrecvoptions.go

@@ -6,6 +6,7 @@ import (
 	"github.com/zrepl/zrepl/config"
 	"github.com/zrepl/zrepl/daemon/filters"
 	"github.com/zrepl/zrepl/endpoint"
+	"github.com/zrepl/zrepl/util/nodefault"
 	"github.com/zrepl/zrepl/zfs"
 )
 
@@ -23,7 +24,7 @@ func buildSenderConfig(in SendingJobConfig, jobID endpoint.JobID) (*endpoint.Sen
 
 	return &endpoint.SenderConfig{
 		FSF:     fsf,
-		Encrypt: &zfs.NilBool{B: in.GetSendOptions().Encrypted},
+		Encrypt: &nodefault.Bool{B: in.GetSendOptions().Encrypted},
 		JobID:   jobID,
 	}, nil
 }

daemon/job/snapjob.go

@@ -10,6 +10,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 
 	"github.com/zrepl/zrepl/daemon/logging/trace"
+	"github.com/zrepl/zrepl/util/nodefault"
 
 	"github.com/zrepl/zrepl/config"
 	"github.com/zrepl/zrepl/daemon/filters"
@@ -179,7 +180,7 @@ func (j *SnapJob) doPrune(ctx context.Context) {
 		JobID: j.name,
 		FSF:   j.fsfilter,
 		// FIXME encryption setting is irrelevant for SnapJob because the endpoint is only used as pruner.Target
-		Encrypt: &zfs.NilBool{B: true},
+		Encrypt: &nodefault.Bool{B: true},
 	})
 	j.prunerMtx.Lock()
 	j.pruner = j.prunerFactory.BuildLocalPruner(ctx, sender, alwaysUpToDateReplicationCursorHistory{sender})