[master 29/30] Add a filesystem mounting task.
mulkieran
installerbot-noreply at redhat.com
Thu Apr 16 20:41:43 UTC 2015
From: mulhern <amulhern at redhat.com>
Related: #12
Signed-off-by: mulhern <amulhern at redhat.com>
---
blivet/tasks/fsmount.py | 201 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 201 insertions(+)
create mode 100644 blivet/tasks/fsmount.py
diff --git a/blivet/tasks/fsmount.py b/blivet/tasks/fsmount.py
new file mode 100644
index 0000000..1483355
--- /dev/null
+++ b/blivet/tasks/fsmount.py
@@ -0,0 +1,201 @@
+# fsmount.py
+# Filesystem mounting 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 os
+
+from ..errors import FSError
+from ..flags import flags
+from .. import util
+from ..formats import fslib
+
+from . import availability
+from . import task
+
+class FSMount(task.Task):
+ """An abstract class that represents filesystem mounting actions. """
+ description = "mount a filesystem"
+
+ app_name = "mount"
+ options = ["defaults"]
+
+ _app = availability.Application(availability.Path(), app_name)
+
+ def __init__(self, an_fs):
+ 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
+
+ canmount = (self.fs.mountType in fslib.kernel_filesystems) or \
+ (os.access("/sbin/mount.%s" % (self.fs.mountType,), os.X_OK))
+
+ # Still consider the filesystem type mountable if there exists
+ # an appropriate filesystem driver in the kernel modules directory.
+ if not canmount:
+ modpath = os.path.realpath(os.path.join("/lib/modules", os.uname()[2]))
+ if os.path.isdir(modpath):
+ modname = "%s.ko" % self.fs.mountType
+ for _root, _dirs, files in os.walk(modpath):
+ if any(x.startswith(modname) for x in files):
+ return True
+
+ if canmount:
+ return False
+ else:
+ return "mounting filesystem %s is not supported" % self.fs.mountType
+
+ @property
+ def unready(self):
+ if not self.fs.exists:
+ return "filesystem has not been created"
+
+ if self.fs.status:
+ return "filesystem is currently mounted"
+
+ if not os.path.exists(self.fs.device):
+ return "device %s does not exist" % self.fs.device
+
+ return False
+
+ @property
+ def unable(self):
+ return False
+
+ # IMPLEMENTATION methods
+
+ def _modifyOptions(self, options):
+ """ Any mandatory options can be added in this method.
+
+ :param str options: an option string
+ :returns: a modified option string
+ :rtype: str
+ """
+ return options
+
+ def mountOptions(self, options):
+ """ The options used for mounting.
+
+ :param options: mount options
+ :type options: str or None
+ :returns: the options used by the task
+ :rtype: str
+ """
+ if not options or not isinstance(options, str):
+ options = self.fs.mountopts or ",".join(self.options)
+
+ return self._modifyOptions(options)
+
+ def doTask(self, mountpoint, options=None):
+ """Create the format on the device and label if possible and desired.
+
+ :param str mountpoint: mountpoint that overrides self.mountpoint
+ :param options: mount options
+ :type options: str or None
+ """
+ # pylint: disable=arguments-differ
+ error_msg = self.impossible
+ if error_msg:
+ raise FSError(error_msg)
+
+ try:
+ rc = util.mount(self.fs.device, mountpoint,
+ fstype=self.fs.mountType,
+ options=self.mountOptions(options))
+ except OSError as e:
+ raise FSError("mount failed: %s" % e)
+
+ if rc:
+ raise FSError("mount failed: %s" % rc)
+
+class BindFSMount(FSMount):
+
+ @property
+ def unavailable(self):
+ if not self._app.available:
+ return "application %s is not available" % self._app
+
+ return False
+
+ def _modifyOptions(self, options):
+ return ",".join(["bind", options])
+
+class DevPtsFSMount(FSMount):
+ options = ["gid=5", "mode=620"]
+
+class FATFSMount(FSMount):
+ options = ["umask=0077", "shortname=winnt"]
+
+class Iso9660FSMount(FSMount):
+ options = ["ro"]
+
+class NoDevFSMount(FSMount):
+
+ @property
+ def unready(self):
+ if not self.fs.exists:
+ return "filesystem has not been created"
+
+ if self.fs.status:
+ return "filesystem is currently mounted"
+
+ return False
+
+class NFSMount(FSMount):
+
+ def unavailable(self):
+ return True
+
+class NTFSMount(FSMount):
+ options = ["default", "ro"]
+
+class SELinuxFSMount(NoDevFSMount):
+
+ @property
+ def unavailable(self):
+ if not flags.selinux:
+ return "selinux not enabled"
+ return super(SELinuxFSMount, self).unavailable
+
+class TmpFSMount(NoDevFSMount):
+
+ def _modifyOptions(self, options):
+ # This duplicates some code in fs.TmpFS._getOptions.
+ # There seems to be no way around that.
+ if self.fs._accept_default_size:
+ size_opt = None
+ else:
+ size_opt = self.fs._sizeOption(self.fs._size)
+ return ",".join(o for o in (options, size_opt) if o)
+
+ @property
+ def unavailable(self):
+ if not self._app.available:
+ return "application %s is not available" % self._app
+
+ return False
--
To view this commit on github, visit https://github.com/rhinstaller/blivet/commit/a0cf646b0065292fe2e9c154f0b7a42b5ed31e12
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