source: trunk/src/pxeconfig.py @ 179

# set ts=4, sw=4
#
# Author: Bas van der Vlies <basv@sara.nl>
# Date  : 16 February 2002
#
# Tester: Walter de Jong <walter@sara.nl>
#
# SVN info
#  $Id: pxeconfig.py 179 2010-04-14 07:27:16Z bas $
#
# Copyright (C) 2002
#
# This file is part of the pxeconfig utils
#
# This program is free software; you can redistribute it and/or modify it 
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
#
"""
Usage: pxeconfig [-f,--filename <name>] <hosts>

Specifying hostnames:
   To specify a range use the [] to indicate a range,
   a couple of examples:

   The first five nodes of rack 16
          - gb-r16n[1-5]

   The first five nodes and node 12 and 18 of rack 16 to 20
      - gb-r[16-20]n[1-5,12,18]

   The first five nodes de in rack 16 with padding enabled 
          - gb-r[16]n[01-5]

The ranges ([]) are not only limited to numbers, letters can also be used.

With this program you can configure which PXE configuration file a node
will use when it boots.

See following link for usage and examples:
 - https://subtrac.sara.nl/oss/pxeconfig/wiki/PxeUsage
"""

import string
import sys
import os
import glob
import getopt
import socket
#import ConfigParser
import re

# import from the sara_python_modules
import AdvancedParser
from pxe_global import *

# Constants
#
PXE_CONF_DIR = '/tftpboot/pxelinux.cfg'
NETWORK      = 'network'
START        = 'start'
END          = 'end'
VERSION      = '3.1.0'

def select_pxe_configfile():
        """
        Let user choose which pxeconfig file to use.
        """ 
        
        os.chdir(PXE_CONF_DIR) 
        
        # Try to determine to which file the default symlink points, and 
        # if it exists, remove it from the list.
        # 
        try:
                default_file = os.readlink('default')
        except OSError:
                default_file = None
        pass

        files = glob.glob('default.*')
        if not files:
                error =  'There are no pxe config files starting with: default.'
                raise PxeConfig, error

        if default_file:
                files.remove(default_file)

        # sort the files
        #
        files.sort()
 
        print 'Which pxe config file must we use: ?' 
        i = 1   
        for file in files:
                print "%d : %s" %(i,file)
                i = i + 1

        while 1:
                index = raw_input('Select a number: ')
                try:
                        index = int(index)
                except ValueError:
                        index = len(files) + 1

                # Is the user smart enough to select
                # the right value??
                #
                if 0 < index <= len(files): 
                        break

        return files[index-1]

def manage_links(haddr, options):
        """
        Create the links in the PXE_CONF_DIR,
        list : A list containing: network hex address, pxe config file, 
           start number, end number
        """
        if options.VERBOSE:
                print 'manage_links(%s)' %(haddr)
        
        os.chdir(PXE_CONF_DIR)
        pxe_filename = options.filename
        
        if options.REMOVE:
                if options.DEBUG or options.DRY_RUN or options.VERBOSE:
                        print 'removing %s/%s' %(PXE_CONF_DIR, haddr)

                if os.path.exists(haddr) and not options.DRY_RUN:
                        os.unlink(haddr)

        else:
                if options.DEBUG or options.DRY_RUN or options.VERBOSE:
                        print 'linking %s to %s' %(haddr, pxe_filename)

                if not options.DRY_RUN:
                        if os.path.exists(haddr):
                                os.unlink(haddr) 
                        os.symlink(pxe_filename, haddr)

def net_2_hex(net, options):
        """
        This function checks if the give network is a Class C-network and will
        convert the network address to a hex address if true.
        """
        if options.DEBUG:
                str = 'net_2_hex : %s' %(net)
                print str
        
        d = string.split(net, '.') 
        if len(d) != 3:
                error = '%s is not a valid  C-class network address' %(net)
                raise PxeConfig, error

        # Check if we have valid network values
        r = ''
        for i in d:
                r = '%s%02X' %(r, int(i))

        if options.DEBUG:
                print 'C-network converted to hex: ', r

        return r

def hosts_2_hex(hosts, options):
        """
        Convert hostname(s) to a net address that can be handled by manage_links function
        """
        if options.DEBUG:
                str = 'host_2_hex: %s' %hosts
                print str

        for host in hosts:
                try:
                        addr = socket.gethostbyname(host)
                except socket.error,detail:
                        error =  '%s not an valid hostname: %s' %(host,detail)
                        raise PxeConfig, error

                net = string.splitfields(addr, '.')
                cnet = string.joinfields(net[0:3], '.')

                if options.SCRIPT_HOOK:
                        if options.DEBUG or options.DRY_RUN or options.VERBOSE:
                                print 'Executing client script hook: %s with arg: %s' %(options.SCRIPT_HOOK, addr)
                        if not options.DRY_RUN:
                                cmd = '%s %s' %(options.SCRIPT_HOOK, addr)
                                os.system(cmd)

                haddr = '%s%02X' %(net_2_hex(cnet, options), int(net[3])) 
                manage_links(haddr, options)

def add_options(p):
        """
        add the default options
        """
        p.set_defaults( 
                DEBUG   = False,
                VERBOSE = False,
                DRY_RUN = False,
                REMOVE  = False,
                VERSION  = False,
                SCRIPT_HOOK = False,
        )

        p.add_option('-d', '--debug',
                action = 'store_true',
                dest   = 'DEBUG',
                help   = 'Toggle debug mode (default : False)'
        )

        p.add_option('-f', '--filename',
                action = 'store',
                dest   = 'filename',
                help   = 'Specifies which PXE filename must be use'
        )

        p.add_option('-n', '--dry-run',
                action = 'store_true',
                dest   = 'DRY_RUN',
                help   = 'Do not execute any command (default : False)'
        )

        p.add_option('-r', '--remove',
                action = 'store_true',
                dest   = 'REMOVE',
                help   = 'Removes the PXE filename for a host(s)'
        )

        p.add_option('-v', '--verbose',
                action = 'store_true',
                dest   = 'VERBOSE',
                help   = 'Make the program more verbose (default: False)'
        )

        p.add_option('-V', '--version',
                action = 'store_true',
                dest   = 'VERSION',
                help   = 'Print the program version number and exit'
        )

def parser(argv, settings): 
        """
        Make use of sara advance parser module. It can handle regex in hostnames
        """
        parser = AdvancedParser.AdvancedParser(usage=__doc__)
        add_options(parser)

        options, args = parser.parse_args() 

        if options.VERSION:
                print VERSION
                sys.exit(0) 

        if not args:
                parser.print_help()
                sys.exit(0)

        # debug can be specified by the command line or options file
        #
        if not options.DEBUG:
                try:
                        if settings['debug']:
                                options.DEBUG = int(settings['debug'])
                except KeyError:
                        pass

        # Only check if we have specified an pxeconfig file if we did not
        # specify the REMOVE option
        #
        if not options.REMOVE:
                if options.filename:
                        if not os.path.isfile(os.path.join(PXE_CONF_DIR, options.filename)):
                                error =  '%s: Filename does not exists' %(options.filename)
                                raise PxeConfig, error
                else:
                        options.filename = select_pxe_configfile() 

        # ...
        try:
                options.SCRIPT_HOOK = settings['client_script_hook']
        except KeyError, detail:
                pass

        if options.DEBUG:
                print args, options

        hosts_2_hex(args, options)


def main():
        # A dictionary holding the boot info
        #
        global PXE_CONF_DIR
        settings = ReadConfig() 
        
        try:
                PXE_CONF_DIR = settings['pxe_config_dir']

        except KeyError:
                pass 

        PXE_CONF_DIR = os.path.realpath(PXE_CONF_DIR)
        if not os.path.isdir(PXE_CONF_DIR):
                error =  'pxeconfig directory: %s does not exists' %(PXE_CONF_DIR)
                raise PxeConfig, error

        parser(sys.argv, settings)

        
if __name__ == '__main__':
        try:
                main()
        except PxeConfig, detail:
                print detail
                sys.exit(1)