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#!/usr/bin/python |
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# |
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|
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# Copyright (C) 2006, 2007 Google Inc. |
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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, but |
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# WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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# 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, write to the Free Software |
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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# 02110-1301, USA. |
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|
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|
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"""Program which configures LVM on the Ganeti nodes. |
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|
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This program wipes disks and creates a volume group on top of them. It |
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can also show disk information to help you decide which disks you want |
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to wipe. |
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|
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The error handling is done by raising our own exceptions from most of |
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the functions; these exceptions then handled globally in the main() |
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function. The exceptions that each function can raise are not |
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documented individually, since almost every error path ends in a |
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raise. |
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|
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Another two exceptions that are handled globally are IOError and |
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OSError. The idea behind this is, since we run as root, we should |
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usually not get these errors, but if we do it's most probably a system |
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error, so they should be handled and the user instructed to report |
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them. |
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""" |
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|
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|
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import os |
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import sys |
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import optparse |
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import time |
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|
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from ganeti.utils import RunCmd |
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from ganeti import constants |
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|
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USAGE = ("\tlvmstrap.py diskinfo\n" |
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"\tlvmstrap.py [--vgname=NAME] { --alldisks | --disks DISKLIST }" |
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" create") |
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|
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verbose_flag = False |
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|
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|
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class Error(Exception): |
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"""Generic exception""" |
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pass |
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|
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|
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class ProgrammingError(Error): |
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"""Exception denoting invalid assumptions in programming. |
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|
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This should catch sysfs tree changes, or otherwise incorrect |
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assumptions about the contents of the /sys/block/... directories. |
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""" |
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pass |
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|
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|
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class SysconfigError(Error): |
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"""Exception denoting invalid system configuration. |
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|
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If the system configuration is somehow wrong (e.g. /dev files |
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missing, or having mismatched major/minor numbers relative to |
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/sys/block devices), this exception will be raised. |
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|
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This should usually mean that the installation of the Xen node |
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failed in some steps. |
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""" |
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pass |
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|
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|
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class PrereqError(Error): |
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"""Exception denoting invalid prerequisites. |
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|
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If the node does not meet the requirements for cluster membership, this |
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exception will be raised. Things like wrong kernel version, or no |
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free disks, etc. belong here. |
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|
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This should usually mean that the build steps for the Xen node were |
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not followed correctly. |
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""" |
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pass |
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|
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|
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class OperationalError(Error): |
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"""Exception denoting actual errors. |
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|
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Errors during the bootstrapping are signaled using this exception. |
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""" |
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pass |
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|
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|
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class ParameterError(Error): |
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"""Exception denoting invalid input from user. |
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|
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Wrong disks given as parameters will be signaled using this |
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exception. |
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""" |
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pass |
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|
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|
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def Usage(): |
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"""Shows program usage information and exits the program.""" |
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|
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print >> sys.stderr, "Usage:" |
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print >> sys.stderr, USAGE |
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sys.exit(2) |
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|
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|
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def ParseOptions(): |
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"""Parses the command line options. |
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|
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In case of command line errors, it will show the usage and exit the |
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program. |
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|
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Returns: |
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(options, args), as returned by OptionParser.parse_args |
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""" |
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global verbose_flag |
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|
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parser = optparse.OptionParser(usage="\n%s" % USAGE, |
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version="%%prog (ganeti) %s" % |
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constants.RELEASE_VERSION) |
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|
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parser.add_option("--alldisks", dest="alldisks", |
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help="erase ALL disks", action="store_true", |
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default=False) |
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parser.add_option("-d", "--disks", dest="disks", |
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help="Choose disks (e.g. hda,hdg)", |
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metavar="DISKLIST") |
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parser.add_option("-v", "--verbose", |
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action="store_true", dest="verbose", default=False, |
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help="print command execution messages to stdout") |
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parser.add_option("-g", "--vg-name", type="string", |
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dest="vgname", default="xenvg", metavar="NAME", |
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help="the volume group to be created [default: xenvg]") |
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|
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|
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options, args = parser.parse_args() |
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if len(args) != 1: |
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Usage() |
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|
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verbose_flag = options.verbose |
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|
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return options, args |
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|
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|
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def ExecCommand(command): |
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"""Executes a command. |
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|
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This is just a wrapper around commands.getstatusoutput, with the |
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difference that if the command line argument -v has been given, it |
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will print the command line and the command output on stdout. |
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|
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Args: |
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the command line |
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Returns: |
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(status, output) where status is the exit status and output the |
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stdout and stderr of the command together |
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""" |
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|
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if verbose_flag: |
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print command |
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result = RunCmd(command) |
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if verbose_flag: |
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print result.output |
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return result |
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|
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|
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def CheckPrereq(): |
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"""Check the prerequisites of this program. |
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|
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It check that it runs on Linux 2.6, and that /sys is mounted and the |
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fact that /sys/block is a directory. |
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""" |
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|
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if os.getuid() != 0: |
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raise PrereqError("This tool runs as root only. Really.") |
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|
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osname, nodename, release, version, arch = os.uname() |
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if osname != 'Linux': |
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raise PrereqError("This tool only runs on Linux" |
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" (detected OS: %s)." % osname) |
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|
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if not release.startswith("2.6."): |
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raise PrereqError("Wrong major kernel version (detected %s, needs" |
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" 2.6.*)" % release) |
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|
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if not os.path.ismount("/sys"): |
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raise PrereqError("Can't find a filesystem mounted at /sys." |
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" Please mount /sys.") |
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|
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if not os.path.isdir("/sys/block"): |
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raise SysconfigError("Can't find /sys/block directory. Has the" |
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" layout of /sys changed?") |
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|
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if not os.path.ismount("/proc"): |
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raise PrereqError("Can't find a filesystem mounted at /proc." |
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" Please mount /proc.") |
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|
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if not os.path.exists("/proc/mounts"): |
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raise SysconfigError("Can't find /proc/mounts") |
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|
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|
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def CheckVGExists(vgname): |
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"""Checks to see if a volume group exists. |
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|
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Args: |
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vgname: the volume group name |
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|
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Returns: |
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a four-tuple (exists, lv_count, vg_size, vg_free), where: |
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exists: True if the volume exists, otherwise False; if False, |
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all other members of the tuple are None |
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lv_count: The number of logical volumes in the volume group |
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vg_size: The total size of the volume group (in gibibytes) |
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vg_free: The available space in the volume group |
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""" |
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|
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result = ExecCommand("vgs --nohead -o lv_count,vg_size,vg_free" |
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" --nosuffix --units g" |
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" --ignorelockingfailure %s" % vgname) |
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if not result.failed: |
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try: |
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lv_count, vg_size, vg_free = result.stdout.strip().split() |
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except ValueError: |
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# This means the output of vgdisplay can't be parsed |
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raise PrereqError("cannot parse output of vgs (%s)" % result.stdout) |
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else: |
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lv_count = vg_size = vg_free = None |
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|
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return not result.failed, lv_count, vg_size, vg_free |
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|
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|
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def CheckSysDev(name, devnum): |
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"""Checks consistency between /sys and /dev trees. |
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|
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In /sys/block/<name>/dev and /sys/block/<name>/<part>/dev are the |
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kernel-known device numbers. The /dev/<name> block/char devices are |
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created by userspace and thus could differ from the kernel |
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view. This function checks the consistency between the device number |
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read from /sys and the actual device number in /dev. |
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|
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Note that since the system could be using udev which removes and |
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recreates the device nodes on partition table rescan, we need to do |
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some retries here. Since we only do a stat, we can afford to do many |
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short retries. |
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|
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Args: |
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name: the device name, e.g. 'sda' |
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devnum: the device number, e.g. 0x803 (2051 in decimal) for sda3 |
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|
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Returns: |
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None; failure of the check is signalled by raising a |
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SysconfigError exception |
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""" |
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|
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path = "/dev/%s" % name |
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for retries in range(40): |
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if os.path.exists(path): |
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break |
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time.sleep(0.250) |
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else: |
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raise SysconfigError("the device file %s does not exist, but the block" |
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" device exists in the /sys/block tree" % path) |
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rdev = os.stat(path).st_rdev |
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if devnum != rdev: |
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raise SysconfigError("For device %s, the major:minor in /dev is %04x" |
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" while the major:minor in sysfs is %s" % |
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(path, rdev, devnum)) |
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|
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|
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def ReadDev(syspath): |
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"""Reads the device number from a sysfs path. |
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|
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The device number is given in sysfs under a block device directory |
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in a file named 'dev' which contains major:minor (in ASCII). This |
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function reads that file and converts the major:minor pair to a dev |
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number. |
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|
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Args: |
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syspath: the path to a block device dir in sysfs, e.g. /sys/block/sda |
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|
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Returns: |
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the device number |
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""" |
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|
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if not os.path.exists("%s/dev" % syspath): |
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raise ProgrammingError("Invalid path passed to ReadDev: %s" % syspath) |
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f = open("%s/dev" % syspath) |
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data = f.read().strip() |
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f.close() |
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major, minor = data.split(":", 1) |
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major = int(major) |
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minor = int(minor) |
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dev = os.makedev(major, minor) |
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return dev |
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|
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|
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def ReadSize(syspath): |
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"""Reads the size from a sysfs path. |
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|
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The size is given in sysfs under a block device directory in a file |
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named 'size' which contains the number of sectors (in ASCII). This |
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function reads that file and converts the number in sectors to the |
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size in bytes. |
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|
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Args: |
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syspath: the path to a block device dir in sysfs, e.g. /sys/block/sda |
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|
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Returns: |
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the device size in bytes |
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""" |
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|
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if not os.path.exists("%s/size" % syspath): |
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raise ProgrammingError("Invalid path passed to ReadSize: %s" % syspath) |
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f = open("%s/size" % syspath) |
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data = f.read().strip() |
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f.close() |
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size = 512L * int(data) |
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return size |
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|
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|
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def ReadPV(name): |
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"""Reads physical volume information. |
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|
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This function tries to see if a block device is a physical volume. |
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|
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Args: |
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dev: the device name (e.g. sda) |
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Returns: |
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The name of the volume group to which this PV belongs, or |
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"" if this PV is not in use, or |
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None if this is not a PV |
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""" |
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|
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result = ExecCommand("pvdisplay -c /dev/%s" % name) |
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if result.failed: |
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return None |
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vgname = result.stdout.strip().split(":")[1] |
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return vgname |
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|
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|
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def GetDiskList(): |
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"""Computes the block device list for this system. |
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|
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This function examines the /sys/block tree and using information |
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therein, computes the status of the block device. |
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|
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Returns: |
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[(name, size, dev, partitions, inuse), ...] |
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where: |
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name is the block device name (e.g. sda) |
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size the size in bytes |
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dev the device number (e.g. 8704 for hdg) |
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partitions is [(name, size, dev), ...] mirroring the disk list data |
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inuse is a boolean showing the in-use status of the disk, computed as the |
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possibility of re-reading the partition table (the meaning of the |
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operation varies with the kernel version, but is usually accurate; |
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a mounted disk/partition or swap-area or PV with active LVs on it |
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is busy) |
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""" |
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|
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dlist = [] |
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for name in os.listdir("/sys/block"): |
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if (not name.startswith("hd") and |
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not name.startswith("sd") and |
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not name.startswith("ubd")): |
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continue |
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|
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size = ReadSize("/sys/block/%s" % name) |
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|
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f = open("/sys/block/%s/removable" % name) |
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removable = int(f.read().strip()) |
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f.close() |
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|
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if removable: |
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continue |
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|
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dev = ReadDev("/sys/block/%s" % name) |
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CheckSysDev(name, dev) |
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inuse = not CheckReread(name) |
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# Enumerate partitions of the block device |
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partitions = [] |
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for partname in os.listdir("/sys/block/%s" % name): |
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if not partname.startswith(name): |
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continue |
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partdev = ReadDev("/sys/block/%s/%s" % (name, partname)) |
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partsize = ReadSize("/sys/block/%s/%s" % (name, partname)) |
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CheckSysDev(partname, partdev) |
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partitions.append((partname, partsize, partdev)) |
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partitions.sort() |
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dlist.append((name, size, dev, partitions, inuse)) |
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dlist.sort() |
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return dlist |
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|
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|
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def GetMountInfo(): |
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"""Reads /proc/mounts and computes the mountpoint-devnum mapping. |
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|
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This function reads /proc/mounts, finds the mounted filesystems |
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(excepting a hard-coded blacklist of network and virtual |
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filesystems) and does a stat on these mountpoints. The st_dev number |
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of the results is memorised for later matching against the |
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/sys/block devices. |
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|
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Returns: |
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a mountpoint: device number dictionary |
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""" |
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|
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f = open("/proc/mounts", "r") |
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mountlines = f.readlines() |
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f.close() |
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mounts = {} |
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for line in mountlines: |
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device, mountpoint, fstype, rest = line.split(None, 3) |
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# fs type blacklist |
430 |
if fstype in ["nfs", "nfs4", "autofs", "tmpfs", "proc", "sysfs"]: |
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continue |
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try: |
433 |
dev = os.stat(mountpoint).st_dev |
434 |
except OSError, err: |
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# this should be a fairly rare error, since we are blacklisting |
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# network filesystems; with this in mind, we'll ignore it, |
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# since the rereadpt check catches in-use filesystems, |
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# and this is used for disk information only |
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print >> sys.stderr, ("Can't stat mountpoint '%s': %s" % |
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(mountpoint, err)) |
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print >> sys.stderr, "Ignoring." |
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continue |
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mounts[dev] = mountpoint |
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return mounts |
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|
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|
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def DevInfo(name, dev, mountinfo): |
448 |
"""Computes miscellaneous informations about a block device. |
449 |
|
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Args: |
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name: the device name, e.g. sda |
452 |
|
453 |
Returns: |
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(mpath, whatvg, fileinfo), where |
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mpath is the mount path where this device is mounted or None |
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whatvg is the result of the ReadPV function |
457 |
fileinfo is the output of file -bs on the device |
458 |
""" |
459 |
|
460 |
if dev in mountinfo: |
461 |
mpath = mountinfo[dev] |
462 |
else: |
463 |
mpath = None |
464 |
|
465 |
whatvg = ReadPV(name) |
466 |
|
467 |
result = ExecCommand("file -bs /dev/%s" % name) |
468 |
if result.failed: |
469 |
fileinfo = "<error: %s>" % result.stderr |
470 |
fileinfo = result.stdout[:45] |
471 |
return mpath, whatvg, fileinfo |
472 |
|
473 |
|
474 |
def ShowDiskInfo(): |
475 |
"""Shows a nicely formatted block device list for this system. |
476 |
|
477 |
This function shows the user a table with the informations gathered |
478 |
by the other functions defined, in order to help the user make a |
479 |
choice about which disks should be allocated to our volume group. |
480 |
|
481 |
""" |
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mounts = GetMountInfo() |
483 |
dlist = GetDiskList() |
484 |
|
485 |
print "------- Disk information -------" |
486 |
print ("%5s %7s %4s %5s %-10s %s" % |
487 |
("Name", "Size[M]", "Used", "Mount", "LVM?", "Info")) |
488 |
|
489 |
flatlist = [] |
490 |
# Flatten the [(disk, [partition,...]), ...] list |
491 |
for name, size, dev, parts, inuse in dlist: |
492 |
if inuse: |
493 |
str_inuse = "yes" |
494 |
else: |
495 |
str_inuse = "no" |
496 |
flatlist.append((name, size, dev, str_inuse)) |
497 |
for partname, partsize, partdev in parts: |
498 |
flatlist.append((partname, partsize, partdev, "")) |
499 |
|
500 |
for name, size, dev, in_use in flatlist: |
501 |
mp, vgname, fileinfo = DevInfo(name, dev, mounts) |
502 |
if mp is None: |
503 |
mp = "-" |
504 |
if vgname is None: |
505 |
lvminfo = "-" |
506 |
elif vgname == "": |
507 |
lvminfo = "yes,free" |
508 |
else: |
509 |
lvminfo = "in %s" % vgname |
510 |
|
511 |
if len(name) > 3: |
512 |
# Indent partitions |
513 |
name = " %s" % name |
514 |
print ("%-5s %7.2f %-4s %-5s %-10s %s" % |
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(name, float(size) / 1024 / 1024, in_use, mp, lvminfo, fileinfo)) |
516 |
|
517 |
|
518 |
def CheckReread(name): |
519 |
"""Check to see if a block device is in use. |
520 |
|
521 |
Uses blockdev to reread the partition table of a block device, and |
522 |
thus compute the in-use status. See the discussion in GetDiskList |
523 |
about the meaning of 'in use'. |
524 |
|
525 |
Returns: |
526 |
boolean, the in-use status of the device |
527 |
""" |
528 |
|
529 |
for retries in range(3): |
530 |
result = ExecCommand("blockdev --rereadpt /dev/%s" % name) |
531 |
if not result.failed: |
532 |
break |
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time.sleep(2) |
534 |
|
535 |
return not result.failed |
536 |
|
537 |
|
538 |
def WipeDisk(name): |
539 |
"""Wipes a block device. |
540 |
|
541 |
This function wipes a block device, by clearing and re-reading the |
542 |
partition table. If not successful, it writes back the old partition |
543 |
data, and leaves the cleanup to the user. |
544 |
|
545 |
Args: |
546 |
the device name (e.g. sda) |
547 |
""" |
548 |
|
549 |
if not CheckReread(name): |
550 |
raise OperationalError("CRITICAL: disk %s you selected seems to be in" |
551 |
" use. ABORTING!" % name) |
552 |
|
553 |
fd = os.open("/dev/%s" % name, os.O_RDWR | os.O_SYNC) |
554 |
olddata = os.read(fd, 512) |
555 |
if len(olddata) != 512: |
556 |
raise OperationalError("CRITICAL: Can't read partition table information" |
557 |
" from /dev/%s (needed 512 bytes, got %d" % |
558 |
(name, len(olddata))) |
559 |
newdata = "\0" * 512 |
560 |
os.lseek(fd, 0, 0) |
561 |
bytes_written = os.write(fd, newdata) |
562 |
os.close(fd) |
563 |
if bytes_written != 512: |
564 |
raise OperationalError("CRITICAL: Can't write partition table information" |
565 |
" to /dev/%s (tried to write 512 bytes, written" |
566 |
" %d. I don't know how to cleanup. Sorry." % |
567 |
(name, bytes_written)) |
568 |
|
569 |
if not CheckReread(name): |
570 |
fd = os.open("/dev/%s" % name, os.O_RDWR | os.O_SYNC) |
571 |
os.write(fd, olddata) |
572 |
os.close(fd) |
573 |
raise OperationalError("CRITICAL: disk %s which I have just wiped cannot" |
574 |
" reread partition table. Most likely, it is" |
575 |
" in use. You have to clean after this yourself." |
576 |
" I tried to restore the old partition table," |
577 |
" but I cannot guarantee nothing has broken." % |
578 |
name) |
579 |
|
580 |
|
581 |
def PartitionDisk(name): |
582 |
"""Partitions a disk. |
583 |
|
584 |
This function creates a single partition spanning the entire disk, |
585 |
by means of fdisk. |
586 |
|
587 |
Args: |
588 |
the device name, e.g. sda |
589 |
""" |
590 |
result = ExecCommand( |
591 |
'echo ,,8e, | sfdisk /dev/%s' % name) |
592 |
if result.failed: |
593 |
raise OperationalError("CRITICAL: disk %s which I have just partitioned" |
594 |
" cannot reread its partition table, or there" |
595 |
" is some other sfdisk error. Likely, it is in" |
596 |
" use. You have to clean this yourself. Error" |
597 |
" message from sfdisk: %s" % |
598 |
(name, result.output)) |
599 |
|
600 |
|
601 |
def CreatePVOnDisk(name): |
602 |
"""Creates a physical volume on a block device. |
603 |
|
604 |
This function creates a physical volume on a block device, overriding |
605 |
all warnings. So it can wipe existing PVs and PVs which are in a VG. |
606 |
|
607 |
Args: |
608 |
the device name, e.g. sda |
609 |
|
610 |
""" |
611 |
result = ExecCommand("pvcreate -yff /dev/%s1 " % name) |
612 |
if result.failed: |
613 |
raise OperationalError("I cannot create a physical volume on" |
614 |
" partition /dev/%s1. Error message: %s." |
615 |
" Please clean up yourself." % |
616 |
(name, result.output)) |
617 |
|
618 |
|
619 |
def CreateVG(vgname, disks): |
620 |
"""Creates the volume group. |
621 |
|
622 |
This function creates a volume group named `vgname` on the disks |
623 |
given as parameters. The physical extent size is set to 64MB. |
624 |
|
625 |
Args: |
626 |
disks: a list of disk names, e.g. ['sda','sdb'] |
627 |
|
628 |
""" |
629 |
pnames = ["'/dev/%s1'" % disk for disk in disks] |
630 |
result = ExecCommand("vgcreate -s 64MB '%s' %s" % (vgname, " ".join(pnames))) |
631 |
if result.failed: |
632 |
raise OperationalError("I cannot create the volume group %s from" |
633 |
" disks %s. Error message: %s. Please clean up" |
634 |
" yourself." % |
635 |
(vgname, " ".join(disks), result.output)) |
636 |
|
637 |
|
638 |
def ValidateDiskList(options): |
639 |
"""Validates or computes the disk list for create. |
640 |
|
641 |
This function either computes the available disk list (if the user |
642 |
gave --alldisks option), or validates the user-given disk list (by |
643 |
using the --disks option) such that all given disks are present and |
644 |
not in use. |
645 |
|
646 |
Args: |
647 |
the options returned from OptParser.parse_options |
648 |
|
649 |
Returns: |
650 |
a list of disk names, e.g. ['sda', 'sdb'] |
651 |
""" |
652 |
|
653 |
sysdisks = GetDiskList() |
654 |
if not sysdisks: |
655 |
raise PrereqError("no disks found (I looked for" |
656 |
" non-removable block devices).") |
657 |
sysd_free = [] |
658 |
sysd_used = [] |
659 |
for name, size, dev, part, used in sysdisks: |
660 |
if used: |
661 |
sysd_used.append(name) |
662 |
else: |
663 |
sysd_free.append(name) |
664 |
|
665 |
if not sysd_free: |
666 |
raise PrereqError("no free disks found! (%d in-use disks)" % |
667 |
len(sysd_used)) |
668 |
if options.alldisks: |
669 |
disklist = sysd_free |
670 |
elif options.disks: |
671 |
disklist = options.disks.split(",") |
672 |
for name in disklist: |
673 |
if name in sysd_used: |
674 |
raise ParameterError("disk %s is in use, cannot wipe!" % name) |
675 |
if name not in sysd_free: |
676 |
raise ParameterError("cannot find disk %s!" % name) |
677 |
else: |
678 |
raise ParameterError("Please use either --alldisks or --disks!") |
679 |
|
680 |
return disklist |
681 |
|
682 |
|
683 |
def BootStrap(): |
684 |
"""Actual main routine.""" |
685 |
|
686 |
CheckPrereq() |
687 |
|
688 |
options, args = ParseOptions() |
689 |
vgname = options.vgname |
690 |
command = args.pop(0) |
691 |
if command == "diskinfo": |
692 |
ShowDiskInfo() |
693 |
return |
694 |
if command != "create": |
695 |
Usage() |
696 |
|
697 |
exists, lv_count, vg_size, vg_free = CheckVGExists(vgname) |
698 |
if exists: |
699 |
raise PrereqError("It seems volume group '%s' already exists:\n" |
700 |
" LV count: %s, size: %s, free: %s." % |
701 |
(vgname, lv_count, vg_size, vg_free)) |
702 |
|
703 |
|
704 |
disklist = ValidateDiskList(options) |
705 |
|
706 |
for disk in disklist: |
707 |
WipeDisk(disk) |
708 |
PartitionDisk(disk) |
709 |
for disk in disklist: |
710 |
CreatePVOnDisk(disk) |
711 |
CreateVG(vgname, disklist) |
712 |
|
713 |
status, lv_count, size, free = CheckVGExists(vgname) |
714 |
if status: |
715 |
print "Done! %s: size %s GiB, disks: %s" % (vgname, size, |
716 |
",".join(disklist)) |
717 |
else: |
718 |
raise OperationalError("Although everything seemed ok, the volume" |
719 |
" group did not get created.") |
720 |
|
721 |
|
722 |
def main(): |
723 |
"""application entry point. |
724 |
|
725 |
This is just a wrapper over BootStrap, to handle our own exceptions. |
726 |
""" |
727 |
|
728 |
try: |
729 |
BootStrap() |
730 |
except PrereqError, err: |
731 |
print >> sys.stderr, "The prerequisites for running this tool are not met." |
732 |
print >> sys.stderr, ("Please make sure you followed all the steps in" |
733 |
" the build document.") |
734 |
print >> sys.stderr, "Description: %s" % str(err) |
735 |
sys.exit(1) |
736 |
except SysconfigError, err: |
737 |
print >> sys.stderr, ("This system's configuration seems wrong, at" |
738 |
" least is not what I expect.") |
739 |
print >> sys.stderr, ("Please check that the installation didn't fail" |
740 |
" at some step.") |
741 |
print >> sys.stderr, "Description: %s" % str(err) |
742 |
sys.exit(1) |
743 |
except ParameterError, err: |
744 |
print >> sys.stderr, ("Some parameters you gave to the program or the" |
745 |
" invocation is wrong. ") |
746 |
print >> sys.stderr, "Description: %s" % str(err) |
747 |
Usage() |
748 |
except OperationalError, err: |
749 |
print >> sys.stderr, ("A serious error has happened while modifying" |
750 |
" the system's configuration.") |
751 |
print >> sys.stderr, ("Please review the error message below and make" |
752 |
" sure you clean up yourself.") |
753 |
print >> sys.stderr, ("It is most likely that the system configuration" |
754 |
" has been partially altered.") |
755 |
print >> sys.stderr, str(err) |
756 |
sys.exit(1) |
757 |
except ProgrammingError, err: |
758 |
print >> sys.stderr, ("Internal application error. Please signal this" |
759 |
" to xencluster-team.") |
760 |
print >> sys.stderr, "Error description: %s" % str(err) |
761 |
sys.exit(1) |
762 |
except Error, err: |
763 |
print >> sys.stderr, "Unhandled application error: %s" % err |
764 |
sys.exit(1) |
765 |
except (IOError, OSError), err: |
766 |
print >> sys.stderr, "I/O error detected, please report." |
767 |
print >> sys.stderr, "Description: %s" % str(err) |
768 |
sys.exit(1) |
769 |
|
770 |
|
771 |
if __name__ == "__main__": |
772 |
main() |