fix(someone1#465): ALlow for a local zfs volume that differs from the desired.

Signed-off-by: Johnathan Falk <johnathan.falk@gmail.com>

Author: jdfalk

backup/backup.go

@@ -57,7 +57,7 @@ var (
 // ProcessSmartOptions will compute the snapshots to use
 // nolint:funlen,gocyclo // Difficult to break this up
 func ProcessSmartOptions(ctx context.Context, jobInfo *files.JobInfo) error {
-	snapshots, err := zfs.GetSnapshotsAndBookmarks(context.Background(), jobInfo.VolumeName)
+	snapshots, err := zfs.GetSnapshotsAndBookmarks(context.Background(), zfs.GetLocalVolumeName(jobInfo))
 	if err != nil {
 		return err
 	}
@@ -246,7 +246,7 @@ func Backup(pctx context.Context, jobInfo *files.JobInfo) error {
 	}
 
 	// Validate the snapshots we want to use exist
-	if ok, verr := validateSnapShotExists(ctx, &jobInfo.BaseSnapshot, jobInfo.VolumeName, false); verr != nil {
+	if ok, verr := validateSnapShotExists(ctx, &jobInfo.BaseSnapshot, zfs.GetLocalVolumeName(jobInfo), false); verr != nil {
 		log.AppLogger.Errorf("Cannot validate if selected base snapshot exists due to error - %v", verr)
 		return verr
 	} else if !ok {
@@ -255,7 +255,7 @@ func Backup(pctx context.Context, jobInfo *files.JobInfo) error {
 	}
 
 	if jobInfo.IncrementalSnapshot.Name != "" {
-		if ok, verr := validateSnapShotExists(ctx, &jobInfo.IncrementalSnapshot, jobInfo.VolumeName, true); verr != nil {
+		if ok, verr := validateSnapShotExists(ctx, &jobInfo.IncrementalSnapshot, zfs.GetLocalVolumeName(jobInfo), true); verr != nil {
 			log.AppLogger.Errorf("Cannot validate if selected incremental snapshot exists due to error - %v", verr)
 			return verr
 		} else if !ok {

cmd/send.go

@@ -179,6 +179,12 @@ func init() {
 		10,
 		"the chunk size, in MiB, to use when uploading. A minimum of 5MiB and maximum of 100MiB is enforced.",
 	)
+	sendCmd.Flags().StringVar(
+		&jobInfo.LocalVolume,
+		"localVolume",
+		"",
+		"the local volume name if different from the S3 volume",
+	)
 }
 
 // ResetSendJobInfo exists solely for integration testing
@@ -248,7 +254,8 @@ func updateJobInfo(args []string) error {
 			return errInvalidInput
 		}
 		jobInfo.BaseSnapshot = files.SnapshotInfo{Name: parts[1]}
-		creationTime, err := zfs.GetCreationDate(context.TODO(), args[0])
+		localBaseSnapVolumeName := getLocalBaseSnapshotName(args[0])
+		creationTime, err := zfs.GetCreationDate(context.TODO(), localBaseSnapVolumeName)
 		if err != nil {
 			log.AppLogger.Errorf("Error trying to get creation date of specified base snapshot - %v", err)
 			return err
@@ -257,14 +264,15 @@ func updateJobInfo(args []string) error {
 
 		if jobInfo.IncrementalSnapshot.Name != "" {
 			var targetName string
-			jobInfo.IncrementalSnapshot.Name = strings.TrimPrefix(jobInfo.IncrementalSnapshot.Name, jobInfo.VolumeName)
+			localVolumeName := zfs.GetLocalVolumeName(&jobInfo)
+			jobInfo.IncrementalSnapshot.Name = strings.TrimPrefix(jobInfo.IncrementalSnapshot.Name, localVolumeName)
 			if strings.HasPrefix(jobInfo.IncrementalSnapshot.Name, "#") {
 				jobInfo.IncrementalSnapshot.Name = strings.TrimPrefix(jobInfo.IncrementalSnapshot.Name, "#")
-				targetName = fmt.Sprintf("%s#%s", jobInfo.VolumeName, jobInfo.IncrementalSnapshot.Name)
+				targetName = fmt.Sprintf("%s#%s", localVolumeName, jobInfo.IncrementalSnapshot.Name)
 				jobInfo.IncrementalSnapshot.Bookmark = true
 			} else {
 				jobInfo.IncrementalSnapshot.Name = strings.TrimPrefix(jobInfo.IncrementalSnapshot.Name, "@")
-				targetName = fmt.Sprintf("%s@%s", jobInfo.VolumeName, jobInfo.IncrementalSnapshot.Name)
+				targetName = fmt.Sprintf("%s@%s", localVolumeName, jobInfo.IncrementalSnapshot.Name)
 			}
 
 			creationTime, err = zfs.GetCreationDate(context.TODO(), targetName)
@@ -304,6 +312,23 @@ func updateJobInfo(args []string) error {
 	return nil
 }
 
+// getLocalBaseSnapshotName takes a provided name of the destination snapshot and optionally
+// translates it into the local snapshot if --localVolume is given
+func getLocalBaseSnapshotName(name string) string {
+	var localBaseSnapVolumeName string
+	if jobInfo.LocalVolume != "" {
+		argParts := strings.Split(name, "@")
+		if len(argParts) == 2 {
+			localBaseSnapVolumeName = fmt.Sprintf("%s@%s", jobInfo.LocalVolume, argParts[1])
+		} else {
+			localBaseSnapVolumeName = jobInfo.LocalVolume
+		}
+	} else {
+		localBaseSnapVolumeName = name
+	}
+	return localBaseSnapVolumeName
+}
+
 func usingSmartOption() bool {
 	return jobInfo.Full || jobInfo.Incremental || jobInfo.FullIfOlderThan != -1*time.Minute
 }

zfs/zfs.go

@@ -148,7 +148,7 @@ func GetZFSSendCommand(ctx context.Context, j *files.JobInfo) *exec.Cmd {
 	if j.IncrementalSnapshot.Name != "" {
 		incrementalName := j.IncrementalSnapshot.Name
 		if j.IncrementalSnapshot.Bookmark {
-			incrementalName = fmt.Sprintf("%s#%s", j.VolumeName, incrementalName)
+			incrementalName = fmt.Sprintf("%s#%s", GetLocalVolumeName(j), incrementalName)
 		}
 
 		if j.IntermediaryIncremental {
@@ -160,7 +160,7 @@ func GetZFSSendCommand(ctx context.Context, j *files.JobInfo) *exec.Cmd {
 		}
 	}
 
-	zfsArgs = append(zfsArgs, fmt.Sprintf("%s@%s", j.VolumeName, j.BaseSnapshot.Name))
+	zfsArgs = append(zfsArgs, fmt.Sprintf("%s@%s", GetLocalVolumeName(j), j.BaseSnapshot.Name))
 	cmd := exec.CommandContext(ctx, ZFSPath, zfsArgs...)
 
 	return cmd
@@ -196,8 +196,16 @@ func GetZFSReceiveCommand(ctx context.Context, j *files.JobInfo) *exec.Cmd {
 		zfsArgs = append(zfsArgs, "-o", "origin="+j.Origin)
 	}
 
-	zfsArgs = append(zfsArgs, j.LocalVolume)
+	zfsArgs = append(zfsArgs, GetLocalVolumeName(j))
 	cmd := exec.CommandContext(ctx, ZFSPath, zfsArgs...)
 
 	return cmd
 }
+
+func GetLocalVolumeName(j *files.JobInfo) string {
+	if j.LocalVolume != "" {
+		return j.LocalVolume
+	} else {
+		return j.VolumeName
+	}
+}