94 lines
2.4 KiB
Python
94 lines
2.4 KiB
Python
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#
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# loop.py
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# loop device functions
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#
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# Copyright (C) 2010 Red Hat, Inc. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Author(s): David Lehman <dlehman@redhat.com>
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#
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import os
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from pyanaconda import iutil
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from ..errors import *
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import gettext
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_ = lambda x: gettext.ldgettext("anaconda", x)
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import logging
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log = logging.getLogger("storage")
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def losetup(args, capture=False):
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if capture:
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exec_func = iutil.execWithCapture
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exec_kwargs = {}
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else:
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exec_func = iutil.execWithRedirect
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exec_kwargs = {"stdout": "/dev/tty5"}
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try:
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# ask losetup what this loop device's backing device is
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ret = exec_func("losetup", args,
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stderr="/dev/tty5",
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**exec_kwargs)
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except RuntimeError as e:
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raise LoopError(str(e))
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return ret
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def get_backing_file(name):
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path = ""
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sys_path = "/sys/class/block/%s/loop/backing_file" % name
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if os.access(sys_path, os.R_OK):
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path = open(sys_path).read().strip()
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return path
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def get_loop_name(path):
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args = ["-j", path]
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buf = losetup(args, capture=True)
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if len(buf.splitlines()) > 1:
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# there should never be more than one loop device listed
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raise LoopError("multiple loops associated with %s" % path)
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name = os.path.basename(buf.split(":")[0])
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return name
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def loop_setup(path):
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args = ["-f", path]
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msg = None
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try:
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msg = losetup(args)
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except LoopError as e:
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msg = str(e)
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if msg:
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raise LoopError("failed to set up loop for %s: %s" % (path, msg))
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def loop_teardown(path):
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args = ["-d", path]
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msg = None
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try:
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msg = losetup(args)
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except LoopError as e:
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msg = str(e)
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if msg:
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raise DeviceError("failed to tear down loop %s: %s" % (path, msg))
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