[master 9/30] Add an fsck task.

mulkieran installerbot-noreply at redhat.com
Wed Mar 25 22:47:47 UTC 2015


From: mulhern <amulhern at redhat.com>

Signed-off-by: mulhern <amulhern at redhat.com>
---
 blivet/tasks/fsck.py | 176 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 176 insertions(+)
 create mode 100644 blivet/tasks/fsck.py

diff --git a/blivet/tasks/fsck.py b/blivet/tasks/fsck.py
new file mode 100644
index 0000000..49aadae
--- /dev/null
+++ b/blivet/tasks/fsck.py
@@ -0,0 +1,176 @@
+# fsck.py
+# Filesystem check functionality.
+#
+# 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
+
+from six import add_metaclass
+
+from ..i18n import _, N_
+
+from ..errors import FSError
+from .. import util
+
+from . import availability
+from . import task
+
+_UNKNOWN_RC_MSG = N_("Unknown return code: %d")
+
+ at add_metaclass(abc.ABCMeta)
+class FSCK(task.Task):
+    """An abstract class that represents actions associated with
+       checking consistency of a filesystem.
+    """
+    description = "fsck"
+
+    app_name = abc.abstractproperty(
+       doc="The name of the filesystem labeling 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
+
+    # 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
+
+    @abc.abstractmethod
+    def _errorMessage(self, rc):
+        """ Error message corresponding to rc.
+
+            :param int rc: the fsck program return code
+            :returns: an error message corresponding to the code, or None
+            :rtype: str or NoneType
+
+            A return value of None indicates no error.
+        """
+        raise NotImplementedError()
+
+    def _fsckCommand(self):
+        """The command to check the filesystem.
+
+           :return: the command
+           :rtype: list of str
+        """
+        return [str(self._app())] + self.options + [self.fs.device]
+
+    def doTask(self):
+        """ Check the filesystem.
+
+           :raises FSError: on failure
+        """
+        error_msg = self.impossible
+        if error_msg:
+            raise FSError(error_msg)
+
+        try:
+            rc = util.run_program(self._fsckCommand())
+        except OSError as e:
+            raise FSError("filesystem check failed: %s" % e)
+
+        error_msg = self._errorMessage(rc)
+        if error_msg is not None:
+            hdr = _("%(type)s filesystem check failure on %(device)s: ") % \
+                    {"type": self.fs.type, "device": self.fs.device}
+
+            raise FSError(hdr + error_msg)
+
+
+class DosFSCK(FSCK):
+    _fsckErrors = {1: N_("Recoverable errors have been detected or dosfsck has "
+                        "discovered an internal inconsistency."),
+                   2: N_("Usage error.")}
+
+    app_name = "dosfsck"
+    options = ["-n"]
+
+    def _errorMessage(self, rc):
+        if rc < 1:
+            return None
+        try:
+            return _(self._fsckErrors[rc])
+        except KeyError:
+            return _UNKNOWN_RC_MSG % rc
+
+
+class Ext2FSCK(FSCK):
+    _fsckErrors = {4: N_("File system errors left uncorrected."),
+                   8: N_("Operational error."),
+                   16: N_("Usage or syntax error."),
+                   32: N_("e2fsck cancelled by user request."),
+                   128: N_("Shared library error.")}
+
+    app_name = "e2fsck"
+    options = ["-f", "-p", "-C", "0"]
+
+    def _errorMessage(self, rc):
+        msgs = (_(self._fsckErrors[c]) for c in self._fsckErrors.keys() if rc & c)
+        return "\n".join(msgs).strip() or None
+
+class HFSPlusFSCK(FSCK):
+    app_name = "fsck.hfsplus"
+    options = []
+
+    def _errorMessage(self, rc):
+        # pylint: disable=unused-argument
+        return None
+
+class NTFSFSCK(FSCK):
+    app_name = "ntfsresize"
+    options = ["-c"]
+
+    def _errorMessage(self, rc):
+        return _UNKNOWN_RC_MSG % (rc,) if rc != 0 else None


-- 
To view this commit on github, visit https://github.com/rhinstaller/blivet/commit/57bfe27e69be979ccebddd10baf21f37269113d9


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