qubes-installer-qubes-os/anaconda/pyanaconda/ui/lib/space.py

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# User interface library functions for filesystem/disk space checking
#
# Copyright (C) 2012 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): David Lehman <dlehman@redhat.com>
#
import os
from blivet.size import Size
from pyanaconda import iutil
from pyanaconda.i18n import _, N_
import logging
log = logging.getLogger("anaconda")
class FileSystemSpaceChecker(object):
"""This object provides for a way to verify that enough space is available
on configured filesystems to support the current software selections.
It is run as part of completeness checking every time a spoke changes,
therefore moving this step up out of both the storage and software
spokes.
"""
error_template = N_("Not enough space in filesystems for the current "
"software selection. An additional %s is needed.")
def __init__(self, storage, payload):
"""Create a new FileSystemSpaceChecker object.
Attributes:
payload -- An instance of a packaging.Payload subclass.
storage -- An instance of storage.Storage.
"""
self.payload = payload
self.storage = storage
self.reset()
def reset(self):
"""Get rid of any existing error messages and prepare to run the
check again.
"""
self.success = False
self.deficit = Size(0)
self.error_message = ""
def check(self):
"""Check configured storage against software selections. When this
method is complete (which should be pretty quickly), the following
attributes are available for inspection:
success -- A simple boolean defining whether there's enough
space or not.
deficit -- If unsuccessful, how much space the system is
short for current software selections.
error_message -- If unsuccessful, an error message describing the
situation. This message is suitable for putting
in the info bar at the bottom of a Hub.
"""
self.reset()
free = Size(self.storage.fileSystemFreeSpace)
needed = self.payload.spaceRequired
log.info("fs space: %s needed: %s", free, needed)
self.success = (free >= needed)
if not self.success:
self.deficit = needed - free
self.error_message = _(self.error_template) % self.deficit
return self.success
class DirInstallSpaceChecker(FileSystemSpaceChecker):
"""Use the amount of space available at ROOT_PATH to calculate free space.
This is used for the --dirinstall option where no storage is mounted and it
is using space from the host's filesystem.
"""
def check(self):
"""Check configured storage against software selections. When this
method is complete (which should be pretty quickly), the following
attributes are available for inspection:
success -- A simple boolean defining whether there's enough
space or not.
deficit -- If unsuccessful, how much space the system is
short for current software selections.
error_message -- If unsuccessful, an error message describing the
situation. This message is suitable for putting
in the info bar at the bottom of a Hub.
"""
self.reset()
stat = iutil.eintr_retry_call(os.statvfs, iutil.getSysroot())
free = Size(stat.f_bsize * stat.f_bfree)
needed = self.payload.spaceRequired
log.info("fs space: %s needed: %s", free, needed)
self.success = (free >= needed)
if not self.success:
self.deficit = needed - free
self.error_message = _(self.error_template) % self.deficit
return self.success