[master 16/30] Add a filesystem syncing task.
mulkieran
installerbot-noreply at redhat.com
Fri Apr 10 19:49:44 UTC 2015
From: mulhern <amulhern at redhat.com>
Related: #12
Signed-off-by: mulhern <amulhern at redhat.com>
---
blivet/tasks/fssync.py | 111 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 111 insertions(+)
create mode 100644 blivet/tasks/fssync.py
diff --git a/blivet/tasks/fssync.py b/blivet/tasks/fssync.py
new file mode 100644
index 0000000..1fd64aa
--- /dev/null
+++ b/blivet/tasks/fssync.py
@@ -0,0 +1,111 @@
+# fssync.py
+# Filesystem syncing classes.
+#
+# Copyright (C) 2014 Red Hat, Inc.
+#
+# This copyrighted material is made available to anyone wishing to use,
+# modify, copy, or redistribute it subject to the terms and conditions of
+# the GNU General Public License v.2, or (at your option) any later version.
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY expressed or implied, including the implied warranties of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+# Public License for more details. You should have received a copy of the
+# GNU General Public License along with this program; if not, write to the
+# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
+# source code or documentation are not subject to the GNU General Public
+# License and may only be used or replicated with the express permission of
+# Red Hat, Inc.
+#
+# Red Hat Author(s): Anne Mulhern <amulhern at redhat.com>
+
+import abc
+import os
+
+from six import add_metaclass
+
+from ..errors import FSError
+from .. import util
+
+from . import availability
+from . import task
+
+ at add_metaclass(abc.ABCMeta)
+class FSSync(task.Task):
+ """ An abstract class that represents syncing a filesystem. """
+
+ description = "filesystem syncing"
+
+ app_name = abc.abstractproperty(doc="The name of the syncing application.")
+
+ @classmethod
+ def _app(cls):
+ return availability.Application(availability.Path(), cls.app_name)
+
+ def __init__(self, an_fs):
+ """ Initializer.
+
+ :param FS an_fs: a filesystem object
+ """
+ self.fs = an_fs
+
+ @classmethod
+ def available(cls):
+ return cls._app().available
+
+ @property
+ def unavailable(self):
+ if not self._app().available:
+ return "application %s not available" % self._app()
+ return None
+
+ @property
+ def unready(self):
+ if not self.fs.status:
+ return "filesystem has not been mounted"
+
+ if not os.path.exists(self.fs.device):
+ return "device does not exist"
+
+ return False
+
+ @property
+ def unable(self):
+ return False
+
+ @abc.abstractmethod
+ def doTask(self):
+ raise NotImplementedError()
+
+class XFSSync(FSSync):
+ """ Info application for XFS. """
+
+ app_name = "xfs_freeze"
+
+ def _freezeCommand(self):
+ return [str(self._app()), "-f", self.fs.systemMountpoint]
+
+ def _unfreezeCommand(self):
+ return [str(self._app()), "-u", self.fs.systemMountpoint]
+
+ def doTask(self, root="/"):
+ # pylint: disable=arguments-differ
+ error_msg = self.impossible
+ if error_msg:
+ raise FSError(error_msg)
+
+ error_msg = None
+ try:
+ rc = util.run_program(self._freezeCommand(), root=root)
+ except OSError as e:
+ error_msg = "failed to sync filesytem: %s" % e
+ error_msg = error_msg or rc
+
+ try:
+ rc = util.run_program(self._unfreezeCommand(), root=root)
+ except OSError as e:
+ error_msg = error_msg or "failed to sync filesystem: %s" % e
+ error_msg = error_msg or rc
+
+ if error_msg:
+ raise FSError(error_msg)
--
To view this commit on github, visit https://github.com/rhinstaller/blivet/commit/417e575b5feb2e3ab4ef6b071cf5ff0c01f34200
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