[master 10/30] Add a distinct task for reading filesystem labels.
mulkieran
installerbot-noreply at redhat.com
Fri Apr 17 21:49:35 UTC 2015
From: mulhern <amulhern at redhat.com>
Related: #12
Signed-off-by: mulhern <amulhern at redhat.com>
---
blivet/tasks/fsreadlabel.py | 159 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 159 insertions(+)
create mode 100644 blivet/tasks/fsreadlabel.py
diff --git a/blivet/tasks/fsreadlabel.py b/blivet/tasks/fsreadlabel.py
new file mode 100644
index 0000000..0c24ea8
--- /dev/null
+++ b/blivet/tasks/fsreadlabel.py
@@ -0,0 +1,159 @@
+# fsreadlabel.py
+# Filesystem label reading 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 at redhat.com>
+
+import abc
+import os
+import re
+
+from six import add_metaclass
+
+from ..errors import FSReadLabelError
+from .. import util
+
+from . import availability
+from . import task
+
+ at add_metaclass(abc.ABCMeta)
+class FSReadLabel(task.Task):
+ """ An abstract class that represents reading a filesystem's label. """
+ description = "read filesystem label"
+
+ app_name = abc.abstractproperty(
+ doc="The name of the filesystem labeling application.")
+
+ label_regex = abc.abstractproperty(
+ doc="Matches the string output by the reading application.")
+
+ args = abc.abstractproperty(doc="arguments for reading 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):
+ return False
+
+ # IMPLEMENTATION methods
+
+ @property
+ def _readCommand(self):
+ """Get the command to read the filesystem label.
+
+ :return: the command
+ :rtype: list of str
+ """
+ return [str(self._app())] + self.args
+
+ def _extractLabel(self, labelstr):
+ """Extract the label from an output string.
+
+ :param str labelstr: the string containing the label information
+
+ :return: the label
+ :rtype: str
+
+ Raises an FSReadLabelError if the label can not be extracted.
+ """
+ match = re.match(self.label_regex, labelstr)
+ if match is None:
+ raise FSReadLabelError("Unknown format for application %s" % self._app())
+ return match.group('label')
+
+ def doTask(self):
+ """ Get the label.
+
+ :returns: the filesystem label
+ :rtype: str
+ """
+ error_msg = self.impossible
+ if error_msg:
+ raise FSReadLabelError(error_msg)
+
+ (rc, out) = util.run_program_and_capture_output(self._readCommand)
+ if rc != 0:
+ raise FSReadLabelError("read label failed")
+
+ label = out.strip()
+
+ return label if label == "" else self._extractLabel(label)
+
+class DosFSReadLabel(FSReadLabel):
+ app_name = "dosfslabel"
+ label_regex = r'(?P<label>.*)'
+
+ @property
+ def args(self):
+ return [self.fs.device]
+
+class Ext2FSReadLabel(FSReadLabel):
+ app_name = "e2label"
+ label_regex = r'(?P<label>.*)'
+
+ @property
+ def args(self):
+ return [self.fs.device]
+
+class NTFSReadLabel(FSReadLabel):
+ app_name = "ntfslabel"
+ label_regex = r'(?P<label>.*)'
+
+ @property
+ def args(self):
+ return [self.fs.device]
+
+class XFSReadLabel(FSReadLabel):
+ app_name = "xfs_admin"
+ label_regex = r'label = "(?P<label>.*)"'
+
+ @property
+ def args(self):
+ return ["-l", self.fs.device]
--
To view this commit on github, visit https://github.com/rhinstaller/blivet/commit/24de0b8f28fe9751386e94fd8da623b5310369fd
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