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zfs: bookmark / replication cursor: handle spaces in ds names correctly

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fixes #131
This commit is contained in:
Christian Schwarz
2019-03-21 16:59:08 +01:00
parent 7d9a1b7eae
commit ab38f24198
2 changed files with 11 additions and 8 deletions
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zfs/replication_history.go
+8 -7
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@@ -24,35 +24,36 @@ func ZFSGetReplicationCursor(fs *DatasetPath) (*FilesystemVersion, error) {
func ZFSSetReplicationCursor(fs *DatasetPath, snapname string) (guid uint64, err error) {
snapPath := fmt.Sprintf("%s@%s", fs.ToString(), snapname)
debug("replication cursor: snap path %q", snapPath)
propsSnap, err := zfsGet(snapPath, []string{"createtxg", "guid"}, sourceAny)
if err != nil {
return 0, err
return 0, errors.Wrap(err, "zfs: replication cursor: get snapshot createtxg")
}
snapGuid, err := strconv.ParseUint(propsSnap.Get("guid"), 10, 64)
bookmarkPath := fmt.Sprintf("%s#%s", fs.ToString(), ReplicationCursorBookmarkName)
propsBookmark, err := zfsGet(bookmarkPath, []string{"createtxg"}, sourceAny)
_, bookmarkNotExistErr := err.(*DatasetDoesNotExist)
if err != nil && !bookmarkNotExistErr {
return 0, err
return 0, errors.Wrap(err, "zfs: replication cursor: get bookmark txg")
}
if err == nil {
bookmarkTxg, err := strconv.ParseUint(propsBookmark.Get("createtxg"), 10, 64)
if err != nil {
return 0, errors.Wrap(err, "cannot parse bookmark createtxg")
return 0, errors.Wrap(err, "zfs: replication cursor: parse bookmark createtxg")
}
snapTxg, err := strconv.ParseUint(propsSnap.Get("createtxg"), 10, 64)
if err != nil {
return 0, errors.Wrap(err, "cannot parse snapshot createtxg")
return 0, errors.Wrap(err, "zfs: replication cursor: parse snapshot createtxg")
}
if snapTxg < bookmarkTxg {
return 0, errors.New("replication cursor can only be advanced, not set back")
return 0, errors.New("zfs: replication cursor: can only be advanced, not set back")
}
if err := ZFSDestroy(bookmarkPath); err != nil { // FIXME make safer by using new temporary bookmark, then rename, possible with channel programs
return 0, err
return 0, errors.Wrap(err, "zfs: replication cursor: destroy current cursor")
}
}
if err := ZFSBookmark(fs, snapname, ReplicationCursorBookmarkName); err != nil {
return 0, err
return 0, errors.Wrapf(err, "zfs: replication cursor: create bookmark")
}
return snapGuid, nil
}