ignore some zfs create error messages

zfs/transfer.go

@@ -2,6 +2,7 @@ package zfs
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -212,7 +213,14 @@ func DoSync(from, to *Fs, flags Flags) error {
 			// ensure the filesystem exists
 			toChild, err := to.CreateIfMissing(fromChild.name)
 			if err != nil {
-				return err
+				var exitErr *exec.ExitError
+				ignore := false
+				if errors.As(err, &exitErr) {
+					ignore = canIgnoreCreateError(string(exitErr.Stderr))
+				}
+				if !ignore {
+					return err
+				}
 			}
 			err = DoSync(fromChild, toChild, flags)
 			if err != nil {
@@ -223,3 +231,8 @@ func DoSync(from, to *Fs, flags Flags) error {
 
 	return nil
 }
+
+func canIgnoreCreateError(msg string) bool {
+	return strings.Contains(msg, "successfully created, but not mounted") ||
+		strings.Contains(msg, "filesystem successfully created, but it may only be mounted by root")
+}