[WIP] Add support for /home reuse to automatic partitioning

We use destroy only for plain partition mountpoints as we can't destroy
lv or btrfs subvolume - it would not free space for the new one (and its
vg or btrfs volume). For lvs and btrfs subvols we reuse reformat from
mount point assignment (real erase would be perhaps better, even for
mount point assignment as recreating the device complicates the logic)

TODO:
+ unify biosboot partition with other stuff (configurable)
+ look at all roots
+ test with plain
+ test with lvm
+ test with thin lvm
+ --remove should fail silently?
+ kickstart support (--erase --reuse --remove)
- kickstart tests
- reuse fstab mount options (/home is missing compression)
+ add checks that the device found is unique (including biosboot/efi)
- checks for recreate only on plain partition?
- create check for usability of the /home reuse (for UI)
- update unit tests
- luks? .. same as mount-point-assignment ?
- efi partitions, we have only biosboot so far
+ update for device_id: #5435
- add better mount point assignment kickstart tests, we update code
there (fedora, lvm, plain)

pyanaconda/modules/common/structures/partitioning.py

@@ -32,6 +32,9 @@ def __init__(self):
         self._partitioning_scheme = conf.storage.default_scheme
         self._file_system_type = ""
         self._excluded_mount_points = []
+        self._erased_mount_points = []
+        self._reused_mount_points = []
+        self._removed_mount_points = []
         self._hibernation = False
 
         self._encrypted = False
@@ -113,6 +116,56 @@ def hibernation(self, value: Bool):
     def excluded_mount_points(self, mount_points: List[Str]):
         self._excluded_mount_points = mount_points
 
+    @property
+    def erased_mount_points(self) -> List[Str]:
+        """Erased mount points.
+
+        Erase and reuse existing devices for the mount points.
+
+        For example: /
+
+        :return: a list of mount points
+        """
+        return self._erased_mount_points
+
+    @erased_mount_points.setter
+    def erased_mount_points(self, mount_points: List[Str]):
+        self._erased_mount_points = mount_points
+
+    @property
+    def reused_mount_points(self) -> List[Str]:
+        """Reused mount points.
+
+        Reuse existing devices for the mount points.
+
+        For example: /home
+
+        :return: a list of mount points
+        """
+        return self._reused_mount_points
+
+    @reused_mount_points.setter
+    def reused_mount_points(self, mount_points: List[Str]):
+        self._reused_mount_points = mount_points
+
+    @property
+    def removed_mount_points(self) -> List[Str]:
+        """Removed mount points.
+
+        Destroy the devices for the mount points if they exist.
+
+        Supported only for plain partition mount points
+
+        For example: /boot
+
+        :return: a list of mount points
+        """
+        return self._removed_mount_points
+
+    @removed_mount_points.setter
+    def removed_mount_points(self, mount_points: List[Str]):
+        self._removed_mount_points = mount_points
+
     @property
     def encrypted(self) -> Bool:
         """Should devices be encrypted?

pyanaconda/modules/storage/partitioning/automatic/automatic_partitioning.py

@@ -17,16 +17,22 @@
 #
 from blivet.partitioning import do_partitioning, grow_lvm
 from blivet.static_data import luks_data
+from blivet.errors import StorageError
 
 from pyanaconda.anaconda_loggers import get_module_logger
+from pyanaconda.core.i18n import _
 from pyanaconda.modules.common.structures.partitioning import PartitioningRequest
 from pyanaconda.modules.storage.partitioning.automatic.noninteractive_partitioning import \
     NonInteractivePartitioningTask
+from pyanaconda.modules.storage.partitioning.manual.utils import \
+    reformat_device
+from pyanaconda.modules.storage.partitioning.interactive.utils import destroy_device
 from pyanaconda.modules.storage.partitioning.automatic.utils import get_candidate_disks, \
     schedule_implicit_partitions, schedule_volumes, schedule_partitions, get_pbkdf_args, \
     get_default_partitioning, get_part_spec, get_disks_for_implicit_partitions
 from pyanaconda.core.storage import suggest_swap_size
 
+
 log = get_module_logger(__name__)
 
 __all__ = ["AutomaticPartitioningTask"]
@@ -56,6 +62,86 @@ def _get_initialization_config(self):
         config.clear_non_existent = True
         return config
 
+    def _get_mountpoint_device(self, storage, mountpoint, required=True):
+        devices = []
+        # TODO add support for EFI
+        if mountpoint == "biosboot":
+            for device in storage.devices:
+                if device.format.type == "biosboot":
+                   devices.append(device)
+        else:
+            for root in storage.roots:
+                if mountpoint in root.mounts:
+                    devices.append(root.mounts[mountpoint])
+        if len(devices) > 1:
+            raise StorageError(_("Multiple devices found for mountpoint '{}': {}")
+                               .format(mountpoint,
+                                       ", ".join([device.name for device in devices])))
+        if not devices:
+            if required:
+                raise StorageError(_("No devices found for mountpoint '{}'").format(mountpoint))
+            else:
+                return None
+
+        return devices[0]
+
+    def _reused_devices_mountpoints(self, request):
+        return request.reused_mount_points + request.erased_mount_points
+
+    def _get_reused_device_names(self, storage):
+        reused_devices = {}
+        for mountpoint in self._reused_devices_mountpoints(self._request):
+            device = self._get_mountpoint_device(storage, mountpoint)
+            reused_devices[device.name] = mountpoint
+        return reused_devices
+
+    def _erase_mountpoint(self, storage, mountpoint):
+        device = self._get_mountpoint_device(storage, mountpoint)
+        log.debug("DDDDD erase device %s for  mountpoint: %s", device, mountpoint)
+        reused_devices = self._get_reused_device_names(storage)
+        # FIXME it would be better to really erase the device
+        reformat_device(storage, device, dependencies=reused_devices)
+
+    def _remove_mountpoint(self, storage, mountpoint):
+        device = self._get_mountpoint_device(storage, mountpoint, required=False)
+        if device:
+            log.debug("DDDDD remove device %s for mountpoint %s", device, mountpoint)
+            destroy_device(storage, device)
+        else:
+            log.debug("DDDDD device to be removed for mountpoint %s not found", mountpoint)
+
+    def _clear_partitions(self, storage):
+        super()._clear_partitions(storage)
+
+        log.debug("DDDDD storage.roots.mounts %s", [root.mounts for root in storage.roots])
+
+        # TODO check that partitioning scheme matches - do it earlier in the
+        # check but also here?
+
+        # TODO maybe move to _configure_partitioning? Seems safer here.
+        for mountpoint in self._request.removed_mount_points:
+            self._remove_mountpoint(storage, mountpoint)
+        for mountpoint in self._request.erased_mount_points:
+            self._erase_mountpoint(storage, mountpoint)
+
+    def _schedule_reused_mountpoint(self, storage, mountpoint):
+        device = self._get_mountpoint_device(storage, mountpoint)
+        log.debug("DDDDD add mount device request for reused mountpoint: %s device: %s",
+                  mountpoint, device)
+        device.format.mountpoint = mountpoint
+
+    def _schedule_erased_mountpoint(self, storage, mountpoint):
+        old_device = self._get_mountpoint_device(storage, mountpoint)
+        # FIXME: use rather erase for btrfs reformat (no device recreation)
+        # The device might have been recreated (btrfs)
+        device = storage.devicetree.resolve_device(old_device.name)
+        if device:
+            log.debug("DDDDD add mount device request for erased mountpoint: %s device: %s",
+                      mountpoint, device)
+            device.format.mountpoint = mountpoint
+        else:
+            log.debug("DDDDD device for erased mountpoint %s not found", mountpoint)
+
     def _configure_partitioning(self, storage):
         """Configure the partitioning.
 
@@ -88,7 +174,15 @@ def _configure_partitioning(self, storage):
         requests = self._get_partitioning(storage, scheme, self._request)
 
         # Do the autopart.
-        self._do_autopart(storage, scheme, requests, encrypted, luks_format_args)
+        create_implicit_partitions = not self._implicit_partitions_reused(storage, self._request)
+        self._do_autopart(storage, scheme, requests, encrypted, luks_format_args,
+                          create_implicit_partitions)
+
+        for mountpoint in self._request.reused_mount_points:
+            self._schedule_reused_mountpoint(storage, mountpoint)
+        for mountpoint in self._request.erased_mount_points:
+            self._schedule_erased_mountpoint(storage, mountpoint)
+
 
     @staticmethod
     def _get_luks_format_args(storage, request):
@@ -140,8 +234,11 @@ def _get_partitioning(storage, scheme, request: PartitioningRequest):
             if spec.schemes and scheme not in spec.schemes:
                 continue
 
-            # Skip excluded mount points.
-            if (spec.mountpoint or spec.fstype) in request.excluded_mount_points:
+            # Skip excluded or reused mount points.
+            skipped = request.excluded_mount_points
+            skipped.extend(request.reused_mount_points)
+            skipped.extend(request.erased_mount_points)
+            if (spec.mountpoint or spec.fstype) in skipped:
                 continue
 
             # Detect swap.
@@ -169,8 +266,20 @@ def _get_partitioning(storage, scheme, request: PartitioningRequest):
 
         return specs
 
+    def _implicit_partitions_reused(self, storage, request):
+        for mountpoint in self._reused_devices_mountpoints(request):
+            device = self._get_mountpoint_device(storage, mountpoint)
+            if hasattr(device, "vg"):
+                log.debug("DDDDD reusing volume group %s", device.vg)
+                return True
+            if hasattr(device, "volume"):
+                log.debug("DDDDD reusing volume %s", device.volume)
+                return True
+        return False
+
     @staticmethod
-    def _do_autopart(storage, scheme, requests, encrypted=False, luks_fmt_args=None):
+    def _do_autopart(storage, scheme, requests, encrypted=False, luks_fmt_args=None,
+                     create_implicit_partitions=True):
         """Perform automatic partitioning.
 
         :param storage: an instance of Blivet
@@ -192,8 +301,10 @@ def _do_autopart(storage, scheme, requests, encrypted=False, luks_fmt_args=None)
         log.debug("candidate disks: %s", [d.name for d in disks])
 
         # Schedule implicit partitions.
-        extra_disks = get_disks_for_implicit_partitions(disks, scheme, requests)
-        devs = schedule_implicit_partitions(storage, extra_disks, scheme, encrypted, luks_fmt_args)
+        devs = []
+        if create_implicit_partitions:
+            extra_disks = get_disks_for_implicit_partitions(disks, scheme, requests)
+            devs = schedule_implicit_partitions(storage, extra_disks, scheme, encrypted, luks_fmt_args)
 
         # Schedule requested partitions.
         devs = schedule_partitions(storage, disks, devs, scheme, requests, encrypted, luks_fmt_args)

pyanaconda/modules/storage/partitioning/automatic/utils.py

@@ -422,7 +422,8 @@ def schedule_partitions(storage, disks, implicit_devices, scheme, requests, encr
                                   parents=dev)
             storage.create_device(luks_dev)
 
-        if scheme in (AUTOPART_TYPE_LVM, AUTOPART_TYPE_LVM_THINP, AUTOPART_TYPE_BTRFS):
+        if scheme in (AUTOPART_TYPE_LVM, AUTOPART_TYPE_LVM_THINP, AUTOPART_TYPE_BTRFS) and \
+                implicit_devices:
             # doing LVM/BTRFS -- make sure the newly created partition fits in some
             # free space together with one of the implicitly requested partitions
             smallest_implicit = sorted(implicit_devices, key=lambda d: d.size)[0]

pyanaconda/modules/storage/partitioning/manual/manual_partitioning.py

@@ -22,6 +22,7 @@
 from pyanaconda.core.i18n import _
 from pyanaconda.modules.storage.partitioning.automatic.noninteractive_partitioning import \
     NonInteractivePartitioningTask
+from pyanaconda.modules.storage.partitioning.manual.utils import reformat_device
 
 log = get_module_logger(__name__)
 
@@ -77,52 +78,13 @@ def _setup_mount_point(self, storage, mount_data):
             )
 
         if reformat:
-            if format_type:
-                fmt = get_format(format_type)
-
-                if not fmt:
-                    raise StorageError(
-                        _("Unknown or invalid format '{}' specified for "
-                          "device '{}'").format(format_type, device.name)
-                    )
-            else:
-                old_fmt = device.format
-
-                if not old_fmt or old_fmt.type is None:
-                    raise StorageError(_("No format on device '{}'").format(device.name))
-
-                fmt = get_format(old_fmt.type)
-
-            if device.raw_device.type in ("btrfs volume", "btrfs subvolume"):
-                # 'Format', or rather clear the device by recreating it
-
-                # recreating @device will remove all nested subvolumes of it, we cannot allow
-                # using these nested subvolumes for other MountPointRequest without also
-                # re-creating them
-                if device.raw_device.type == "btrfs volume":
-                    dep_subvolumes = device.raw_device.subvolumes
-                elif device.raw_device.type == "btrfs subvolume":
-                    dep_subvolumes = [sub.device_id for sub in device.raw_device.volume.subvolumes
-                                      if sub.depends_on(device.raw_device)]
-                problem_subvolumes = [req for req in self._requests if (req.mount_point
-                                                                        and not req.reformat
-                                                                        and req.device_spec in
-                                                                        dep_subvolumes)]
-                if problem_subvolumes:
-                    err = (_("{} mounted as {}").format(dep.device_spec,
-                                                        dep.mount_point) for dep in problem_subvolumes)
-                    raise StorageError(
-                        _("Reformatting the '{}' subvolume will remove the following nested "
-                          "subvolumes which cannot be reused: {}").format(device.raw_device.name,
-                                                                          ", ".join(err)))
-                device = self._recreate_btrfs_device(storage, device_spec)
-                mount_data.mount_options = device.format.options
-            else:
-                storage.format_device(device, fmt)
-
-            # make sure swaps end up in /etc/fstab
-            if fmt.type == "swap":
-                storage.add_fstab_swap(device)
+            requested_devices = dict(((req.device_spec, req.mount_point) for req in self._requests))
+            device, mount_options = reformat_device(storage,
+                                                    device,
+                                                    format_type,
+                                                    dependencies=requested_devices)
+            if mount_options is not None:
+                mount_data.mount_options = mount_options
 
         # add "mounted" swaps to fstab
         if device.format.type == "swap" and mount_point == "swap":
@@ -134,50 +96,3 @@ def _setup_mount_point(self, storage, mount_data):
 
         device.format.create_options = mount_data.format_options
         device.format.options = mount_data.mount_options
-
-    def _recreate_btrfs_volume(self, storage, device):
-        """Recreate a btrfs volume device by destroying and adding it.
-
-        :param storage: an instance of the Blivet's storage object
-        :param device: a BtrfsVolumeDevice to recreate
-        """
-        if device.children:
-            raise StorageError(
-                _("Cannot reformat Btrfs volume '{}' with "
-                  "existing subvolumes").format(device.name))
-        storage.destroy_device(device)
-        for parent in device.parents:
-            storage.format_device(parent, get_format("btrfs"))
-        new_btrfs = storage.new_btrfs(parents=device.parents[:],
-                                      name=device.name)
-        storage.create_device(new_btrfs)
-        return new_btrfs
-
-    def _recreate_btrfs_subvolume(self, storage, device):
-        """Recreate a btrfs subvolume device by destroying and adding it.
-
-        :param storage: an instance of the Blivet's storage object
-        :param device: a BtrfsSubVolumeDevice to recreate
-        """
-        storage.recursive_remove(device)
-        new_btrfs = storage.new_btrfs(parents=device.parents[:],
-                                      name=device.name,
-                                      subvol=True)
-        storage.create_device(new_btrfs)
-        return new_btrfs
-
-    def _recreate_btrfs_device(self, storage, dev_spec):
-        """Recreate a device by destroying and adding it.
-
-        :param storage: an instance of the Blivet's storage object
-        :param dev_spec: a string describing a block device to be recreated
-        """
-        device = storage.devicetree.get_device_by_device_id(dev_spec)
-
-        if device.type == "btrfs volume":
-            # can't use device factory for just the volume
-            return self._recreate_btrfs_volume(storage, device)
-        elif device.type == "btrfs subvolume":
-            # using the factory for subvolumes in some cases removes
-            # the volume too, we don't want that
-            return self._recreate_btrfs_subvolume(storage, device)