From: mulhern amulhern@redhat.com
Signed-off-by: mulhern amulhern@redhat.com --- blivet/tasks/fsinfo.py | 127 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100644 blivet/tasks/fsinfo.py
diff --git a/blivet/tasks/fsinfo.py b/blivet/tasks/fsinfo.py new file mode 100644 index 0000000..2ae0cd7 --- /dev/null +++ b/blivet/tasks/fsinfo.py @@ -0,0 +1,127 @@ +# fsinfo.py +# Filesystem information gathering classes. +# +# Copyright (C) 2015 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@redhat.com + +import abc +import os + +from six import add_metaclass + +from ..errors import FSError +from .. import util + +from . import availability +from . import task + +@add_metaclass(abc.ABCMeta) +class FSInfo(task.Task): + """ An abstract class that represents an information gathering app. """ + + description = "filesystem info" + + app_name = abc.abstractproperty( + doc="The name of the filesystem information gathering application.") + + options = abc.abstractproperty( + doc="Options for invoking the 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 False + + @property + def unready(self): + if not self.fs.exists: + return "filesystem has not been created" + + if not os.path.exists(self.fs.device): + return "device does not exist" + + return False + + @property + def unable(self): + return False + + def _infoCommand(self): + """ Returns the command for reading filesystem information. + + :returns: a list of appropriate options + :rtype: list of str + """ + return [str(self._app())] + self.options + [self.fs.device] + + def doTask(self): + """ Returns information from the command. + + :returns: a string representing the output of the command + :rtype: str + :raises FSError: if info cannot be obtained + """ + error_msg = self.impossible + if error_msg: + raise FSError(error_msg) + try: + (rc, out) = util.run_program_and_capture_output(self._infoCommand()) + if rc: + error_msg = "failed to gather fs info: %s" % rc + except OSError as e: + error_msg = "failed to gather fs info: %s" % e + if error_msg: + raise FSError(error_msg) + return out + +class Ext2FSInfo(FSInfo): + app_name = "dumpe2fs" + options = ["-h"] + +class JFSInfo(FSInfo): + app_name = "jfs_tune" + options = ["-l"] + +class NTFSInfo(FSInfo): + app_name = "ntfsinfo" + options = ["-m"] + +class ReiserFSInfo(FSInfo): + app_name = "debugreiserfs" + options = [] + +class XFSInfo(FSInfo): + app_name = "xfs_db" + options = ["-c", "sb 0", "-c", "p dblocks", "-c", "p blocksize"]