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# swap.py
# Python module for managing swap devices.
#
# Copyright (C) 2009 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): Dave Lehman <dlehman@redhat.com>
#
import resource
import iutil
import os
from ..errors import *
import gettext
_ = lambda x: gettext.ldgettext("anaconda", x)
def mkswap(device, label='', progress=None):
# We use -f to force since mkswap tends to refuse creation on lvs with
# a message about erasing bootbits sectors on whole disks. Bah.
argv = ["-f"]
if label:
argv.extend(["-L", label])
argv.append(device)
rc = iutil.execWithPulseProgress("mkswap", argv,
stderr = "/dev/tty5",
stdout = "/dev/tty5",
progress=progress)
if rc:
raise SwapError("mkswap failed for '%s'" % device)
def swapon(device, priority=None):
pagesize = resource.getpagesize()
buf = None
sig = None
if pagesize > 2048:
num = pagesize
else:
num = 2048
try:
fd = os.open(device, os.O_RDONLY)
buf = os.read(fd, num)
except OSError:
pass
finally:
try:
os.close(fd)
except (OSError, UnboundLocalError):
pass
if buf is not None and len(buf) == pagesize:
sig = buf[pagesize - 10:]
if sig == 'SWAP-SPACE':
raise OldSwapError
if sig == 'S1SUSPEND\x00' or sig == 'S2SUSPEND\x00':
raise SuspendError
if sig != 'SWAPSPACE2':
raise UnknownSwapError
argv = []
if isinstance(priority, int) and 0 <= priority <= 32767:
argv.extend(["-p", "%d" % priority])
argv.append(device)
rc = iutil.execWithRedirect("swapon",
argv,
stderr = "/dev/tty5",
stdout = "/dev/tty5")
if rc:
raise SwapError("swapon failed for '%s'" % device)
def swapoff(device):
rc = iutil.execWithRedirect("swapoff", [device],
stderr = "/dev/tty5",
stdout = "/dev/tty5")
if rc:
raise SwapError("swapoff failed for '%s'" % device)
def swapstatus(device):
lines = open("/proc/swaps").readlines()
status = False
for line in lines:
if not line.strip():
continue
if line.split()[0] == device:
status = True
break
return status
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