[master 30/30] Add a resize task.

mulkieran installerbot-noreply at redhat.com
Wed Mar 25 22:48:08 UTC 2015


From: mulhern <amulhern at redhat.com>

Signed-off-by: mulhern <amulhern at redhat.com>
---
 blivet/tasks/fsresize.py | 186 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 186 insertions(+)
 create mode 100644 blivet/tasks/fsresize.py

diff --git a/blivet/tasks/fsresize.py b/blivet/tasks/fsresize.py
new file mode 100644
index 0000000..3027dc1
--- /dev/null
+++ b/blivet/tasks/fsresize.py
@@ -0,0 +1,186 @@
+# fsresize.py
+# Filesystem resizing 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
+
+from six import add_metaclass
+
+from ..errors import FSError
+from ..size import B, KiB, MiB, GiB, KB, MB, GB
+from ..import util
+
+from . import availability
+from . import task
+
+ at add_metaclass(abc.ABCMeta)
+class FSResize(task.Task):
+    """ An abstract class for resizing a filesystem. """
+
+    description = "resize filesystem"
+
+    app_name = abc.abstractproperty(
+       doc="The name of the filesystem resizing application.")
+
+    unit = abc.abstractproperty(doc="Resize unit.")
+
+    args = abc.abstractproperty(doc="Resize arguments.")
+
+    @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 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
+
+    # IMPLEMENTATION methods
+
+    @abc.abstractmethod
+    def sizeSpec(self):
+        """ Returns a string specification for the target size of the command.
+            :returns: size specification
+            :rtype: str
+        """
+        raise NotImplementedError()
+
+    def _resizeCommand(self):
+        return [str(self._app())] + self.args
+
+    def doTask(self):
+        """ Resize the device.
+
+            :raises FSError: on failure
+        """
+        error_msg = self.impossible
+        if error_msg:
+            raise FSError(error_msg)
+
+        try:
+            ret = util.run_program(self._resizeCommand())
+        except OSError as e:
+            raise FSError(e)
+
+        if ret:
+            raise FSError("resize failed: %s" % ret)
+
+class Ext2FSResize(FSResize):
+    app_name = "resize2fs"
+    unit = MiB
+    # No unit specifier is interpreted not as bytes, but block size
+    size_fmt = {KiB: "%dK", MiB: "%dM", GiB: "%dG"}[unit]
+
+    def sizeSpec(self):
+        return self.size_fmt % self.fs.targetSize.convertTo(self.unit)
+
+    @property
+    def args(self):
+        return ["-p", self.fs.device, self.sizeSpec()]
+
+class NTFSResize(FSResize):
+    app_name = "ntfsresize"
+    unit = B
+    size_fmt = {B: "%d", KB: "%dK", MB: "%dM", GB: "%dG"}[unit]
+
+    def sizeSpec(self):
+        return self.size_fmt % self.fs.targetSize.convertTo(self.unit)
+
+    @property
+    def args(self):
+        return [
+           "-ff", # need at least two 'f's to fully supress interaction
+           "-s", self.sizeSpec(),
+           self.fs.device
+        ]
+
+class TmpFSResize(FSResize):
+
+    app_name = "mount"
+    unit = MiB
+    size_fmt = {KiB: "%dk", MiB: "%dm", GiB: "%dg"}[unit]
+
+    def sizeSpec(self):
+        return "size=%s" % (self.size_fmt % self.fs.targetSize.convertTo(self.unit))
+
+    @property
+    def unready(self):
+        # TmpFS does not require a device in order to be mounted.
+        if not self.fs.exists:
+            return "filesystem has not been created"
+
+        return False
+
+    @property
+    def args(self):
+        # This is too closely mixed in w/ TmpFS object, due to the
+        # fact that resizing is done by mounting and that the options are
+        # therefore mount options. The situation is hard to avoid, though.
+        opts = self.fs.mountopts or ",".join(self.fs._mount.options)
+        options = ("remount", opts, self.sizeSpec())
+        return ['-o', ",".join(options), self.fs._type, self.fs.systemMountpoint]
+
+class UnimplementedFSResize(task.UnimplementedTask, FSResizeTask):
+
+    def __init__(self, an_fs):
+        """ Initializer.
+
+            :param FS an_fs: a filesystem object
+        """
+        self.fs = an_fs
+
+    @property
+    def unit(self):
+        raise NotImplementedError()
+
+    @property
+    def size_fmt(self):
+        raise NotImplementedError()
+>>>>>>> 8c59753... with resize


-- 
To view this commit on github, visit https://github.com/rhinstaller/blivet/commit/74a6580bcba96af061070abfaa3ae2d1328a06bf


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