88 lines
2.6 KiB
Python
88 lines
2.6 KiB
Python
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#
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# dm.py
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# device-mapper functions
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#
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# Copyright (C) 2009 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): Dave Lehman <dlehman@redhat.com>
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#
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import os
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import block
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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 dm_setup(args):
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ret = iutil.execWithRedirect("dmsetup", args,
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stdout = "/dev/tty5",
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stderr = "/dev/tty5")
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if ret:
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raise DMError(ret.stderr)
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def dm_create_linear(map_name, device, length, uuid):
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table = "0 %d linear %s 0" % (length, device)
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args = ["create", map_name, "--uuid", uuid, "--table", "%s" % table]
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try:
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dm_setup(args)
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except DMError as msg:
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raise DMError("dm_create_linear (%s, %d, %s) failed: %s"
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% (map_name, length, device, msg))
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def dm_remove(map_name):
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args = ["remove", map_name]
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try:
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dm_setup(args)
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except DMError as msg:
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raise DMError("dm_remove (%s) failed: %s" % (map_name, msg))
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def name_from_dm_node(dm_node):
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# first, try sysfs
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name_file = "/sys/class/block/%s/dm/name" % dm_node
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try:
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name = open(name_file).read().strip()
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except IOError:
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# next, try pyblock
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name = block.getNameFromDmNode(dm_node)
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return name
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def dm_node_from_name(map_name):
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named_path = "/dev/mapper/%s" % map_name
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try:
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# /dev/mapper/ nodes are usually symlinks to /dev/dm-N
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node = os.path.basename(os.readlink(named_path))
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except OSError:
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try:
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# dm devices' names are based on the block device minor
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st = os.stat(named_path)
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minor = os.minor(st.st_rdev)
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node = "dm-%d" % minor
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except OSError:
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# try pyblock
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node = block.getDmNodeFromName(map_name)
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if not node:
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raise DMError("dm_node_from_name(%s) has failed." % node)
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return node
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