1 | # set ts=4, sw=4 |
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2 | # |
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3 | # Author: Bas van der Vlies <basv@sara.nl> |
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4 | # Date : 16 February 2002 |
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5 | # |
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6 | # Tester: Walter de Jong <walter@sara.nl> |
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7 | # |
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8 | # SVN info |
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9 | # $Id: pxeconfig.py 166 2009-08-19 06:11:39Z bas $ |
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10 | # |
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11 | # Copyright (C) 2002 |
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12 | # |
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13 | # This file is part of the pxeconfig utils |
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14 | # |
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15 | # This program is free software; you can redistribute it and/or modify it |
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16 | # under the terms of the GNU General Public License as published by the |
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17 | # Free Software Foundation; either version 2, or (at your option) any |
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18 | # later version. |
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19 | # |
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20 | # This program is distributed in the hope that it will be useful, |
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21 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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22 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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23 | # GNU General Public License for more details. |
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24 | # |
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25 | # You should have received a copy of the GNU General Public License |
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26 | # along with this program; if not, write to the Free Software |
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27 | # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
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28 | # |
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29 | """ |
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30 | Usage: pxeconfig [-f,--filename <name>] <hosts> |
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31 | |
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32 | Specifying hostnames: |
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33 | To specify a range use the [] to indicate a range, |
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34 | a couple of examples: |
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35 | |
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36 | The first five nodes of rack 16 |
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37 | - gb-r16n[1-5] |
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38 | |
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39 | The first five nodes and node 12 and 18 of rack 16 to 20 |
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40 | - gb-r[16-20]n[1-5,12,18] |
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41 | |
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42 | The first five nodes de in rack 16 with padding enabled |
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43 | - gb-r[16]n[01-5] |
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44 | |
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45 | The ranges ([]) are not only limited to numbers, letters can also be used. |
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46 | |
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47 | With this program you can configure which PXE configuration file a node |
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48 | will use when it boots. |
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49 | |
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50 | See following link for usage and examples: |
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51 | - https://subtrac.sara.nl/oss/pxeconfig/wiki/PxeUsage |
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52 | """ |
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53 | |
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54 | import string |
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55 | import sys |
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56 | import os |
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57 | import glob |
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58 | import getopt |
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59 | import socket |
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60 | import ConfigParser |
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61 | import re |
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62 | |
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63 | # import from the sara_python_modules |
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64 | import AdvancedParser |
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65 | |
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66 | # Constants |
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67 | # |
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68 | PXE_CONF_DIR = '/tftpboot/pxelinux.cfg' |
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69 | NETWORK = 'network' |
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70 | START = 'start' |
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71 | END = 'end' |
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72 | VERSION = '3.0.4' |
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73 | |
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74 | class PxeConfig(Exception): |
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75 | def __init__(self, msg=''): |
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76 | self.msg = msg |
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77 | Exception.__init__(self, msg) |
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78 | |
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79 | def __repr__(self): |
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80 | return self.msg |
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81 | |
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82 | def ReadConfig(file): |
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83 | """ |
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84 | Parse the config file |
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85 | """ |
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86 | if not os.path.isfile(file): |
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87 | error = 'File %s does not exist' %file |
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88 | raise PxeConfig, error |
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89 | |
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90 | config = ConfigParser.RawConfigParser() |
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91 | try: |
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92 | config.read(file) |
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93 | except ConfigParser.MissingSectionHeaderError,detail: |
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94 | raise PxeConfig, detail |
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95 | |
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96 | # Not yet uses |
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97 | # |
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98 | #projects = {} |
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99 | #for section in config.sections(): |
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100 | # projects[section] = {} |
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101 | # for option in config.options(section): |
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102 | # projects[section][option] = config.get(section, option) |
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103 | |
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104 | stanza = config.defaults() |
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105 | return stanza |
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106 | |
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107 | def select_pxe_configfile(): |
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108 | """ |
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109 | Let user choose which pxeconfig file to use. |
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110 | """ |
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111 | |
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112 | os.chdir(PXE_CONF_DIR) |
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113 | |
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114 | # Try to determine to which file the default symlink points, and |
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115 | # if it exists, remove it from the list. |
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116 | # |
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117 | try: |
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118 | default_file = os.readlink('default') |
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119 | except OSError: |
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120 | default_file = None |
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121 | pass |
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122 | |
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123 | files = glob.glob('default.*') |
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124 | if not files: |
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125 | error = 'There are no pxe config files starting with: default.' |
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126 | raise PxeConfig, error |
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127 | |
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128 | if default_file: |
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129 | files.remove(default_file) |
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130 | |
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131 | # sort the files |
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132 | # |
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133 | files.sort() |
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134 | |
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135 | print 'Which pxe config file must we use: ?' |
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136 | i = 1 |
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137 | for file in files: |
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138 | print "%d : %s" %(i,file) |
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139 | i = i + 1 |
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140 | |
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141 | while 1: |
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142 | index = raw_input('Select a number: ') |
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143 | try: |
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144 | index = int(index) |
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145 | except ValueError: |
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146 | index = len(files) + 1 |
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147 | |
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148 | # Is the user smart enough to select |
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149 | # the right value?? |
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150 | # |
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151 | if 0 < index <= len(files): |
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152 | break |
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153 | |
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154 | return files[index-1] |
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155 | |
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156 | def manage_links(haddr, options): |
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157 | """ |
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158 | Create the links in the PXE_CONF_DIR, |
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159 | list : A list containing: network hex address, pxe config file, |
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160 | start number, end number |
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161 | """ |
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162 | if options.VERBOSE: |
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163 | print 'manage_links(%s)' %(haddr) |
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164 | |
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165 | os.chdir(PXE_CONF_DIR) |
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166 | pxe_filename = options.filename |
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167 | |
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168 | if options.REMOVE: |
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169 | if options.DEBUG or options.DRY_RUN or options.VERBOSE: |
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170 | print 'removing %s/%s' %(PXE_CONF_DIR, haddr) |
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171 | |
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172 | if os.path.exists(haddr) and not options.DRY_RUN: |
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173 | os.unlink(haddr) |
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174 | |
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175 | else: |
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176 | if options.DEBUG or options.DRY_RUN or options.VERBOSE: |
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177 | print 'linking %s to %s' %(haddr, pxe_filename) |
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178 | |
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179 | if not options.DRY_RUN: |
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180 | if os.path.exists(haddr): |
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181 | os.unlink(haddr) |
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182 | os.symlink(pxe_filename, haddr) |
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183 | |
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184 | def net_2_hex(net, options): |
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185 | """ |
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186 | This function checks if the give network is a Class C-network and will |
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187 | convert the network address to a hex address if true. |
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188 | """ |
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189 | if options.DEBUG: |
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190 | str = 'net_2_hex : %s' %(net) |
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191 | print str |
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192 | |
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193 | d = string.split(net, '.') |
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194 | if len(d) != 3: |
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195 | error = '%s is not a valid C-class network address' %(net) |
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196 | raise PxeConfig, error |
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197 | |
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198 | # Check if we have valid network values |
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199 | r = '' |
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200 | for i in d: |
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201 | r = '%s%02X' %(r, int(i)) |
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202 | |
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203 | if options.DEBUG: |
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204 | print 'C-network converted to hex: ', r |
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205 | |
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206 | return r |
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207 | |
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208 | def hosts_2_hex(hosts, options): |
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209 | """ |
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210 | Convert hostname(s) to a net address that can be handled by manage_links function |
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211 | """ |
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212 | if options.DEBUG: |
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213 | str = 'host_2_hex: %s' %hosts |
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214 | print str |
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215 | |
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216 | for host in hosts: |
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217 | try: |
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218 | addr = socket.gethostbyname(host) |
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219 | except socket.error,detail: |
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220 | error = '%s not an valid hostname: %s' %(host,detail) |
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221 | raise PxeConfig, error |
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222 | |
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223 | net = string.splitfields(addr, '.') |
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224 | cnet = string.joinfields(net[0:3], '.') |
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225 | |
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226 | haddr = '%s%02X' %(net_2_hex(cnet, options), int(net[3])) |
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227 | |
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228 | manage_links(haddr, options) |
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229 | |
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230 | |
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231 | def add_options(p): |
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232 | """ |
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233 | add the default options |
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234 | """ |
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235 | p.set_defaults( |
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236 | DEBUG = False, |
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237 | VERBOSE = False, |
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238 | DRY_RUN = False, |
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239 | REMOVE = False, |
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240 | VERSION = False, |
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241 | ) |
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242 | |
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243 | p.add_option('-d', '--debug', |
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244 | action = 'store_true', |
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245 | dest = 'DEBUG', |
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246 | help = 'Toggle debug mode (default : False)' |
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247 | ) |
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248 | |
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249 | p.add_option('-f', '--filename', |
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250 | action = 'store', |
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251 | dest = 'filename', |
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252 | help = 'Specifies which PXE filename must be use' |
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253 | ) |
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254 | |
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255 | p.add_option('-n', '--dry-run', |
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256 | action = 'store_true', |
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257 | dest = 'DRY_RUN', |
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258 | help = 'Do not execute any command (default : False)' |
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259 | ) |
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260 | |
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261 | p.add_option('-r', '--remove', |
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262 | action = 'store_true', |
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263 | dest = 'REMOVE', |
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264 | help = 'Removes the PXE filename for a host(s)' |
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265 | ) |
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266 | |
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267 | p.add_option('-v', '--verbose', |
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268 | action = 'store_true', |
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269 | dest = 'VERBOSE', |
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270 | help = 'Make the program more verbose (default: False)' |
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271 | ) |
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272 | |
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273 | p.add_option('-V', '--version', |
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274 | action = 'store_true', |
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275 | dest = 'VERSION', |
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276 | help = 'Print the program version number and exit' |
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277 | ) |
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278 | |
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279 | def parser(argv, settings): |
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280 | """ |
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281 | Make use of sara advance parser module. It can handle regex in hostnames |
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282 | """ |
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283 | parser = AdvancedParser.AdvancedParser(usage=__doc__) |
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284 | add_options(parser) |
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285 | |
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286 | options, args = parser.parse_args() |
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287 | |
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288 | if options.VERSION: |
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289 | print VERSION |
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290 | sys.exit(0) |
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291 | |
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292 | if not args: |
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293 | parser.print_help() |
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294 | sys.exit(0) |
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295 | |
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296 | # debug can be specified by the command line or options file |
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297 | # |
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298 | if not options.DEBUG: |
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299 | try: |
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300 | if settings['debug']: |
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301 | options.DEBUG = int(settings['debug']) |
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302 | except KeyError: |
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303 | pass |
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304 | |
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305 | if not options.REMOVE: |
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306 | if options.filename: |
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307 | if not os.path.isfile(os.path.join(PXE_CONF_DIR, options.filename)): |
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308 | error = '%s: Filename does not exists' %(options.filename) |
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309 | raise PxeConfig, error |
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310 | else: |
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311 | options.filename = select_pxe_configfile() |
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312 | |
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313 | if options.DEBUG: |
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314 | print args, options |
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315 | |
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316 | hosts_2_hex(args, options) |
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317 | |
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318 | |
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319 | def main(): |
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320 | # A dictionary holding the boot info |
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321 | # |
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322 | global PXE_CONF_DIR |
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323 | |
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324 | configfile = '@pxeconfig_conf@' |
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325 | settings = ReadConfig(configfile) |
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326 | |
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327 | try: |
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328 | PXE_CONF_DIR = settings['pxe_config_dir'] |
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329 | |
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330 | except KeyError: |
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331 | pass |
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332 | |
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333 | PXE_CONF_DIR = os.path.realpath(PXE_CONF_DIR) |
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334 | if not os.path.isdir(PXE_CONF_DIR): |
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335 | error = 'pxeconfig directory: %s does not exists' %(PXE_CONF_DIR) |
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336 | raise PxeConfig, error |
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337 | |
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338 | parser(sys.argv, settings) |
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339 | |
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340 | |
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341 | if __name__ == '__main__': |
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342 | try: |
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343 | main() |
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344 | except PxeConfig, detail: |
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345 | print detail |
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346 | sys.exit(1) |
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