From: mulhern amulhern@redhat.com
Signed-off-by: mulhern amulhern@redhat.com --- blivet/tasks/fswritelabel.py | 149 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 149 insertions(+) create mode 100644 blivet/tasks/fswritelabel.py
diff --git a/blivet/tasks/fswritelabel.py b/blivet/tasks/fswritelabel.py new file mode 100644 index 0000000..74c9653 --- /dev/null +++ b/blivet/tasks/fswritelabel.py @@ -0,0 +1,149 @@ +# fswritelabel.py +# Filesystem label writing 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 .. import util +from ..errors import FSWriteLabelError + +from . import availability +from . import task + +@add_metaclass(abc.ABCMeta) +class FSWriteLabel(task.Task): + """ An abstract class that represents writing a label for a filesystem. """ + + description = "write filesystem label" + + app_name = abc.abstractproperty( + doc="The name of the filesystem labeling application.") + + args = abc.abstractproperty(doc="arguments for writing a label") + + @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 + + # TASK methods + + @classmethod + def available(cls): + return cls._app().available + + @property + def unavailable(self): + if not self._app().available: + return "application %s is 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 (%s) does not exist" % self.fs.device.name + + return False + + @property + def unable(self): + if self.fs.label is None: + return "makes no sense to write a label when accepting default label" + + if not self.fs.labelFormatOK(self.fs.label): + return "bad label format for labelling application %s" % self._app() + + return False + + # IMPLEMENTATION methods + + def _setCommand(self): + """Get the command to label the filesystem. + + :return: the command + :rtype: list of str + + Requires that self.unavailable, self.unable, self.unready are False. + """ + return [str(self._app())] + self.args + + def doTask(self): + error_msg = self.impossible + if error_msg: + raise FSWriteLabelError(error_msg) + + rc = util.run_program(self._setCommand()) + if rc: + raise FSWriteLabelError("label failed") + +class DosFSWriteLabel(FSWriteLabel): + app_name = "dosfslabel" + + @property + def args(self): + return [self.fs.device, self.fs.label] + +class Ext2FSWriteLabel(FSWriteLabel): + app_name = "e2label" + + @property + def args(self): + return [self.fs.device, self.fs.label] + +class JFSWriteLabel(FSWriteLabel): + app_name = "jfs_tune" + + @property + def args(self): + return ["-L", self.fs.label, self.fs.device] + +class NTFSWriteLabel(FSWriteLabel): + app_name = "ntfslabel" + + @property + def args(self): + return [self.fs.device, self.fs.label] + +class ReiserFSWriteLabel(FSWriteLabel): + app_name = "reiserfstune" + + @property + def args(self): + return ["-l", self.fs.label, self.fs.device] + +class XFSWriteLabel(FSWriteLabel): + app_name = "xfs_admin" + + @property + def args(self): + return ["-L", self.fs.label if self.fs.label != "" else "--", self.fs.device]