1 | #!/usr/bin/env python |
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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 | # CVS info |
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9 | # $Date: 2002/02/21 15:38:01 $ |
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10 | # $Revision: 1.6 $ |
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11 | # |
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12 | # Copyright (C) 2000, SARA. |
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13 | # |
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14 | # Permission to use, copy, modify, and distribute this software and its |
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15 | # documentation for non-commercial purposes and without fee is hereby |
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16 | # granted, provided that the above copyright notice appears in all copies |
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17 | # and that both the copyright notice and this permission notice appear in |
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18 | # supporting documentation. |
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19 | # |
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20 | # Neither SARA (Stichting Academisch Rekencentrum Amsterdam) nor the |
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21 | # nor the author make any representations about the suitability of this |
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22 | # software for any purpose. This software is provided ``as is'' without |
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23 | # express or implied warranty. |
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24 | # |
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25 | # |
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26 | """ |
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27 | Usage: pxeconfig [-d|--directory <pxe_config_dir> ] |
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28 | |
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29 | With this program you can configure which PXE configuration file |
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30 | to use when a node boots. The program will ask the following questions: |
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31 | 1) Network address (Class C-network address only) |
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32 | 2) Starting number |
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33 | 3) Ending number |
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34 | 4) Which PXE config file to use |
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35 | |
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36 | For example, if the answers are: |
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37 | 1) 10.168.44 |
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38 | 2) 2 |
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39 | 3) 4 |
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40 | 4) default.node_install |
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41 | |
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42 | Then the result is that is create symbolic links in /tftpboot/pxelinux.cfg: |
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43 | 0AA82C02 ----> default.node_install |
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44 | 0AA82C03 ----> default.node_install |
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45 | 0AA82C04 ----> default.node_install |
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46 | """ |
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47 | |
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48 | import string |
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49 | import sys |
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50 | import os |
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51 | import glob |
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52 | import getopt |
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53 | |
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54 | # DEBUG |
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55 | # |
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56 | DEBUG=0 |
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57 | |
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58 | # Constants |
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59 | # |
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60 | PXE_CONF_DIR='/tftpboot/pxelinux.cfg' |
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61 | NADDR=0 |
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62 | PXEFILE=1 |
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63 | START=2 |
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64 | END=3 |
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65 | SHORTOPT_LIST='d:' |
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66 | LONGOPT_LIST=['directory='] |
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67 | |
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68 | def choice_pxe_configfile(): |
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69 | """ |
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70 | Let user choose which pxeconfig file to use. |
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71 | """ |
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72 | |
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73 | os.chdir(PXE_CONF_DIR) |
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74 | |
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75 | # Try to determine to which file the default symlink points, and |
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76 | # if it exists, remove it from the list. |
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77 | # |
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78 | try: |
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79 | default_file = os.readlink('default') |
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80 | except OSError: |
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81 | default_file = None |
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82 | pass |
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83 | |
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84 | files = glob.glob('default.*') |
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85 | if not files: |
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86 | print 'There are no pxe config files starting with: default.' |
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87 | sys.exit(1) |
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88 | |
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89 | if default_file: |
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90 | files.remove(default_file) |
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91 | |
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92 | |
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93 | print 'Which pxe config file must we use: ?' |
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94 | i = 1 |
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95 | for file in files: |
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96 | print "%d : %s" %(i,file) |
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97 | i = i +1 |
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98 | |
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99 | while 1: |
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100 | index = raw_input('Choice a number: ') |
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101 | try: |
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102 | index = int(index) |
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103 | except ValueError: |
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104 | index = len(files) + 1 |
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105 | |
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106 | # Is the user smart enough to select |
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107 | # the right value?? |
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108 | # |
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109 | if 0 < index <= len(files): break |
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110 | |
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111 | return files[index-1] |
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112 | |
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113 | def create_links(list): |
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114 | """ |
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115 | Create the links in the PXE_CONF_DIR, |
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116 | list : A list containing: network hex address, pxe config file, |
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117 | start number, end number |
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118 | """ |
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119 | os.chdir(PXE_CONF_DIR) |
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120 | naddr = list[NADDR] |
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121 | pxe_filename = list[PXEFILE] |
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122 | for i in range(list[START], list[END]+1): |
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123 | haddr = '%s%02X' %(naddr, i) |
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124 | if DEBUG: |
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125 | print 'linking %s to %s' %(haddr, pxe_filename) |
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126 | os.symlink(pxe_filename, haddr) |
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127 | |
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128 | |
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129 | def check_network(net): |
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130 | """ |
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131 | This function checks if the give network is a Class C-network and will |
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132 | convert the network address to a hex address if true. |
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133 | """ |
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134 | d = string.split(net, '.') |
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135 | |
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136 | if len(d) != 3: |
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137 | print('Only C-class nerwork addresses are supported!!!') |
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138 | sys.exit(1) |
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139 | |
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140 | # Check if we have valid network values |
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141 | r = '' |
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142 | for i in d: |
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143 | i = check_number(i) |
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144 | r = '%s%02X' %(r,i) |
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145 | |
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146 | if DEBUG: |
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147 | print r |
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148 | |
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149 | return r |
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150 | |
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151 | def check_number(number): |
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152 | """ |
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153 | This functions checks if the input is between 0 < number < 255: |
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154 | number : is a string |
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155 | """ |
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156 | try: |
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157 | n = int(number) |
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158 | except ValueError, detail: |
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159 | print detail |
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160 | sys.exit(1) |
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161 | |
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162 | if 0 <= n <= 255: |
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163 | return n |
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164 | else: |
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165 | print '%s is not a valid number, must be between 0 and 255' %number |
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166 | sys.exit(1) |
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167 | |
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168 | def interactive(): |
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169 | |
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170 | iptable = {} |
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171 | |
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172 | print __doc__ |
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173 | |
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174 | network = raw_input('Give network address (xxx.xxx.xxx): ') |
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175 | naddr = check_network(network) |
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176 | |
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177 | start = raw_input('Starting number: ') |
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178 | start = check_number(start) |
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179 | |
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180 | end = raw_input('Ending number: ') |
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181 | end = check_number(end) |
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182 | |
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183 | pxe_filename = choice_pxe_configfile() |
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184 | |
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185 | iptable[network] = [] |
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186 | iptable[network].append(naddr) |
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187 | iptable[network].append(pxe_filename) |
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188 | iptable[network].append(int(start)) |
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189 | iptable[network].append(int(end)) |
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190 | |
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191 | for net in iptable.keys(): |
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192 | if DEBUG: |
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193 | print net, iptable[net] |
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194 | create_links(iptable[net]) |
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195 | |
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196 | |
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197 | def check_args(argv): |
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198 | """ |
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199 | command line option: |
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200 | -d/--directory <dir> |
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201 | Where <dir> is the directory where the pxe config files reside. |
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202 | """ |
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203 | global PXE_CONF_DIR |
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204 | try: |
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205 | opts, args = getopt.getopt(argv[1:], SHORTOPT_LIST, LONGOPT_LIST) |
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206 | except getopt.error, detail: |
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207 | print check_args.__doc__ |
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208 | print detail |
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209 | sys.exit(1) |
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210 | |
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211 | if opts: |
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212 | opt, PXE_CONF_DIR = opts[0] |
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213 | |
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214 | if not os.path.isdir(PXE_CONF_DIR): |
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215 | print 'Directory %s does not exists' %PXE_CONF_DIR |
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216 | sys.exit(1) |
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217 | |
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218 | def main(): |
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219 | check_args(sys.argv) |
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220 | interactive() |
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221 | |
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222 | if __name__ == '__main__': |
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223 | main() |
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