release v3.1.2

Fixes #102, #117

tests/test_zfsautobackup.py

@@ -418,6 +418,13 @@ test_target1/fs2/sub
 test_target1/fs2/sub@test-20101111000000
 """)
 
+    def test_strippath_collision(self):
+        with self.assertRaisesRegexp(Exception,"collision"):
+            ZfsAutobackup("test test_target1 --verbose --strip-path=2 --no-progress --debug".split(" ")).run()
+
+    def test_strippath_toomuch(self):
+        with self.assertRaisesRegexp(Exception,"too much"):
+            ZfsAutobackup("test test_target1 --verbose --strip-path=3 --no-progress --debug".split(" ")).run()
 
     def  test_clearrefres(self):
 

zfs_autobackup/ZfsAutobackup.py

@@ -9,12 +9,12 @@ from .ZfsDataset import ZfsDataset
 from .LogConsole import LogConsole
 from .ZfsNode import ZfsNode
 from .ThinnerRule import ThinnerRule
-
+import os.path
 
 class ZfsAutobackup:
     """main class"""
 
-    VERSION = "3.1.1"
+    VERSION = "3.1.2"
     HEADER = "zfs-autobackup v{} - (c)2021 E.H.Eefting (edwin@datux.nl)".format(VERSION)
 
     def __init__(self, argv, print_arguments=True):
@@ -87,6 +87,8 @@ class ZfsAutobackup:
         parser.add_argument('--rollback', action='store_true',
                             help='Rollback changes to the latest target snapshot before starting. (normally you can '
                                  'prevent changes by setting the readonly property on the target_path to on)')
+        parser.add_argument('--force', '-F', action='store_true',
+                            help='Use zfs -F option to force overwrite/rollback. (Usefull with --strip-path=1, but use with care)')
         parser.add_argument('--destroy-incompatible', action='store_true',
                             help='Destroy incompatible snapshots on target. Use with care! (implies --rollback)')
         parser.add_argument('--destroy-missing', metavar="SCHEDULE", type=str, default=None,
@@ -364,6 +366,29 @@ class ZfsAutobackup:
 
         return ret
 
+    def make_target_name(self, source_dataset):
+        """make target_name from a source_dataset"""
+        stripped=source_dataset.lstrip_path(self.args.strip_path)
+        if stripped!="":
+            return self.args.target_path + "/" + stripped
+        else:
+            return self.args.target_path
+
+    def check_target_names(self, source_node, source_datasets, target_node):
+        """check all target names for collesions etc due to strip-options"""
+
+        self.debug("Checking target names:")
+        target_datasets={}
+        for source_dataset in source_datasets:
+
+            target_name = self.make_target_name(source_dataset)
+            source_dataset.debug("-> {}".format(target_name))
+
+            if target_name in target_datasets:
+                raise Exception("Target collision: Target path {} encountered twice, due to: {} and {}".format(target_name, source_dataset, target_datasets[target_name]))
+
+            target_datasets[target_name]=source_dataset
+
     # NOTE: this method also uses self.args. args that need extra processing are passed as function parameters:
     def sync_datasets(self, source_node, source_datasets, target_node):
         """Sync datasets, or thin-only on both sides
@@ -387,13 +412,14 @@ class ZfsAutobackup:
 
             try:
                 # determine corresponding target_dataset
-                target_name = self.args.target_path + "/" + source_dataset.lstrip_path(self.args.strip_path)
+                target_name = self.make_target_name(source_dataset)
                 target_dataset = ZfsDataset(target_node, target_name)
                 target_datasets.append(target_dataset)
 
                 # ensure parents exists
                 # TODO: this isnt perfect yet, in some cases it can create parents when it shouldn't.
                 if not self.args.no_send \
+                        and target_dataset.parent \
                         and target_dataset.parent not in target_datasets \
                         and not target_dataset.parent.exists:
                     target_dataset.parent.create_filesystem(parents=True)
@@ -414,7 +440,7 @@ class ZfsAutobackup:
                                               destroy_incompatible=self.args.destroy_incompatible,
                                               send_pipes=send_pipes, recv_pipes=recv_pipes,
                                               decrypt=self.args.decrypt, encrypt=self.args.encrypt,
-                                              zfs_compressed=self.args.zfs_compressed)
+                                              zfs_compressed=self.args.zfs_compressed, force=self.args.force)
             except Exception as e:
                 fail_count = fail_count + 1
                 source_dataset.error("FAILED: " + str(e))
@@ -560,6 +586,9 @@ class ZfsAutobackup:
                     raise (Exception(
                         "Target path '{}' does not exist. Please create this dataset first.".format(target_dataset)))
 
+                # check for collisions due to strip-path
+                self.check_target_names(source_node, source_datasets, target_node)
+
                 # do the actual sync
                 # NOTE: even with no_send, no_thinning and no_snapshot it does a usefull thing because it checks if the common snapshots and shows incompatible snapshots
                 fail_count = self.sync_datasets(

zfs_autobackup/ZfsDataset.py

@@ -79,7 +79,11 @@ class ZfsDataset:
         Args:
             :type count: int
         """
-        return "/".join(self.split_path()[count:])
+        components=self.split_path()
+        if count>len(components):
+            raise Exception("Trying to strip too much from path ({} items from {})".format(count, self.name))
+
+        return "/".join(components[count:])
 
     def rstrip_path(self, count):
         """return name with last count components stripped
@@ -188,7 +192,11 @@ class ZfsDataset:
         if self.is_snapshot:
             return ZfsDataset(self.zfs_node, self.filesystem_name)
         else:
-            return ZfsDataset(self.zfs_node, self.rstrip_path(1))
+            stripped=self.rstrip_path(1)
+            if stripped:
+                return ZfsDataset(self.zfs_node, stripped)
+            else:
+                return None
 
     # NOTE: unused for now
     # def find_prev_snapshot(self, snapshot, also_other_snapshots=False):
@@ -577,7 +585,7 @@ class ZfsDataset:
 
         return output_pipe
 
-    def recv_pipe(self, pipe, features, recv_pipes, filter_properties=None, set_properties=None, ignore_exit_code=False):
+    def recv_pipe(self, pipe, features, recv_pipes, filter_properties=None, set_properties=None, ignore_exit_code=False, force=False):
         """starts a zfs recv for this snapshot and uses pipe as input
 
         note: you can it both on a snapshot or filesystem object. The
@@ -618,6 +626,9 @@ class ZfsDataset:
         # verbose output
         cmd.append("-v")
 
+        if force:
+            cmd.append("-F")
+
         if 'extensible_dataset' in features and "-s" in self.zfs_node.supported_recv_options:
             # support resuming
             self.debug("Enabled resume support")
@@ -648,7 +659,7 @@ class ZfsDataset:
 
     def transfer_snapshot(self, target_snapshot, features, prev_snapshot, show_progress,
                           filter_properties, set_properties, ignore_recv_exit_code, resume_token,
-                          raw, send_properties, write_embedded, send_pipes, recv_pipes, zfs_compressed):
+                          raw, send_properties, write_embedded, send_pipes, recv_pipes, zfs_compressed, force):
         """transfer this snapshot to target_snapshot. specify prev_snapshot for
         incremental transfer
 
@@ -689,7 +700,7 @@ class ZfsDataset:
         pipe = self.send_pipe(features=features, show_progress=show_progress, prev_snapshot=prev_snapshot,
                               resume_token=resume_token, raw=raw, send_properties=send_properties, write_embedded=write_embedded, send_pipes=send_pipes, zfs_compressed=zfs_compressed)
         target_snapshot.recv_pipe(pipe, features=features, filter_properties=filter_properties,
-                                  set_properties=set_properties, ignore_exit_code=ignore_recv_exit_code, recv_pipes=recv_pipes)
+                                  set_properties=set_properties, ignore_exit_code=ignore_recv_exit_code, recv_pipes=recv_pipes, force=force)
 
     def abort_resume(self):
         """abort current resume state"""
@@ -986,7 +997,7 @@ class ZfsDataset:
 
     def sync_snapshots(self, target_dataset, features, show_progress, filter_properties, set_properties,
                        ignore_recv_exit_code, holds, rollback, decrypt, encrypt, also_other_snapshots,
-                       no_send, destroy_incompatible, send_pipes, recv_pipes, zfs_compressed):
+                       no_send, destroy_incompatible, send_pipes, recv_pipes, zfs_compressed, force):
         """sync this dataset's snapshots to target_dataset, while also thinning
         out old snapshots along the way.
 
@@ -1007,6 +1018,8 @@ class ZfsDataset:
             :type destroy_incompatible: bool
         """
 
+        self.verbose("sending to {}".format(target_dataset))
+
         (common_snapshot, start_snapshot, source_obsoletes, target_obsoletes, target_keeps,
          incompatible_target_snapshots) = \
             self._plan_sync(target_dataset=target_dataset, also_other_snapshots=also_other_snapshots)
@@ -1069,7 +1082,9 @@ class ZfsDataset:
                                                   filter_properties=active_filter_properties,
                                                   set_properties=active_set_properties,
                                                   ignore_recv_exit_code=ignore_recv_exit_code,
-                                                  resume_token=resume_token, write_embedded=write_embedded, raw=raw, send_properties=send_properties, send_pipes=send_pipes, recv_pipes=recv_pipes, zfs_compressed=zfs_compressed)
+                                                  resume_token=resume_token, write_embedded=write_embedded, raw=raw,
+                                                  send_properties=send_properties, send_pipes=send_pipes,
+                                                  recv_pipes=recv_pipes, zfs_compressed=zfs_compressed, force=force)
 
                 resume_token = None