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Rewrote file rename_target_dir

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This commit is contained in:
Bahtiar `kalkin-` Gadimov 2016-06-16 13:32:54 +02:00
parent a4577c0dce
commit 38dc74587d
1 changed files with 21 additions and 13 deletions
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34
qubes/storage/file.py
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@ -24,6 +24,9 @@
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
''' This module contains pool implementations backed by file images'''
from __future__ import absolute_import
import os
@ -122,13 +125,7 @@ class FilePool(Pool):
if not os.path.exists(new_dir):
os.makedirs(new_dir)
# FIXME: proper polymorphism
if volume.volume_type == 'read-write':
volume.rename_target_dir(new_name, new_dir)
elif volume.volume_type == 'read-only':
volume.rename_target_dir(old_name, new_dir)
elif volume.volume_type in ['origin', 'volatile']:
volume.rename_target_dir(new_dir)
volume.rename_target_dir(old_name, new_name)
return volume
@ -275,6 +272,13 @@ class FileVolume(Volume):
assert self.target_dir, "target_dir not specified"
super(FileVolume, self).__init__(**kwargs)
def _new_dir(self, new_name):
''' Returns a new directory path based on the new_name. This is a helper
method for moving file images during vm renaming.
'''
old_dir = os.path.dirname(self.path)
return os.path.join(os.path.dirname(old_dir), new_name)
class SizeMixIn(FileVolume):
''' A mix in which expects a `size` param to be > 0 on initialization and
@ -328,13 +332,14 @@ class ReadOnlyFile(FileVolume):
super(ReadOnlyFile, self).__init__(size=int(size), **kwargs)
self.path = self.vid
def rename_target_dir(self, old_name, new_dir):
def rename_target_dir(self, old_name, new_name):
""" Called by :py:class:`FilePool` when a domain changes it's name.
Only copies the volume if it belongs to the domain being renamed.
Currently if a volume is in a directory named the same as the domain,
it's ”owned” by the domain.
"""
new_dir = self._new_dir(new_name)
if os.path.basename(self.target_dir) == old_name:
file_name = os.path.basename(self.path)
new_path = os.path.join(new_dir, file_name)
@ -366,8 +371,10 @@ class OriginFile(SizeMixIn):
''' Commit Template changes '''
raise NotImplementedError
def rename_target_dir(self, new_dir):
''' Called by :py:class:`FilePool` when a domain changes it's name '''
def rename_target_dir(self, old_name, new_name):
''' Called by :py:class:`FilePool` when a domain changes it's name.
''' # pylint: disable=unused-argument
new_dir = self._new_dir(new_name)
old_path_origin = self.path_origin
old_path_cow = self.path_cow
new_path_origin = os.path.join(new_dir, self.name + '.img')
@ -414,8 +421,10 @@ class VolatileFile(SizeMixIn):
self.path = os.path.join(self.target_dir, self.name + '.img')
self.vid = self.path
def rename_target_dir(self, new_dir):
''' Called by :py:class:`FilePool` when a domain changes it's name '''
def rename_target_dir(self, old_name, new_name):
''' Called by :py:class:`FilePool` when a domain changes it's name.
''' # pylint: disable=unused-argument
new_dir = self._new_dir(new_name)
_remove_if_exists(self.path)
file_name = os.path.basename(self.path)
self.target_dir = new_dir
@ -423,7 +432,6 @@ class VolatileFile(SizeMixIn):
self.path = new_path
self.vid = self.path
def create_sparse_file(path, size):
''' Create an empty sparse file '''
if os.path.exists(path):