Mercurial > cpython-lru_cache-weakref

annotate Demo/rpc/mountclient.py @ 5817:48b94de85bf3 legacy-trunk

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author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
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children 3b45c04a4833
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1 # Mount RPC client -- RFC 1094 (NFS), Appendix A
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2
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3 # This module demonstrates how to write your own RPC client in Python.
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4 # Since there is no RPC compiler for Python (yet), you must first
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5 # create classes derived from Packer and Unpacker to handle the data
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6 # types for the server you want to interface to. You then write the
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7 # client class. If you want to support both the TCP and the UDP
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8 # version of a protocol, use multiple inheritance as shown below.
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9
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10
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11 import rpc
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12 from rpc import Packer, Unpacker, TCPClient, UDPClient
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13
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14
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15 # Program number and version for the mount protocol
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16 MOUNTPROG = 100005
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17 MOUNTVERS = 1
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18
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19 # Size of the 'fhandle' opaque structure
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20 FHSIZE = 32
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21
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22
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23 # Packer derived class for Mount protocol clients.
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24 # The only thing we need to pack beyond basic types is an 'fhandle'
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25
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26 class MountPacker(Packer):
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27
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28 def pack_fhandle(self, fhandle):
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29 self.pack_fopaque(FHSIZE, fhandle)
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30
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31
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32 # Unpacker derived class for Mount protocol clients.
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33 # The important types we need to unpack are fhandle, fhstatus,
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34 # mountlist and exportlist; mountstruct, exportstruct and groups are
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35 # used to unpack components of mountlist and exportlist and the
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36 # corresponding functions are passed as function argument to the
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37 # generic unpack_list function.
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38
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39 class MountUnpacker(Unpacker):
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40
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41 def unpack_fhandle(self):
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42 return self.unpack_fopaque(FHSIZE)
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43
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44 def unpack_fhstatus(self):
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45 status = self.unpack_uint()
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46 if status == 0:
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47 fh = self.unpack_fhandle()
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48 else:
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49 fh = None
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50 return status, fh
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51
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52 def unpack_mountlist(self):
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53 return self.unpack_list(self.unpack_mountstruct)
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54
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55 def unpack_mountstruct(self):
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56 hostname = self.unpack_string()
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57 directory = self.unpack_string()
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58 return (hostname, directory)
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59
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60 def unpack_exportlist(self):
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61 return self.unpack_list(self.unpack_exportstruct)
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62
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63 def unpack_exportstruct(self):
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64 filesys = self.unpack_string()
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65 groups = self.unpack_groups()
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66 return (filesys, groups)
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67
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68 def unpack_groups(self):
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69 return self.unpack_list(self.unpack_string)
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70
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71
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72 # These are the procedures specific to the Mount client class.
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73 # Think of this as a derived class of either TCPClient or UDPClient.
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74
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75 class PartialMountClient:
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76
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77 # This method is called by Client.__init__ to initialize
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78 # self.packer and self.unpacker
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79 def addpackers(self):
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80 self.packer = MountPacker()
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81 self.unpacker = MountUnpacker('')
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82
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83 # This method is called by Client.__init__ to bind the socket
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84 # to a particular network interface and port. We use the
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85 # default network interface, but if we're running as root,
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86 # we want to bind to a reserved port
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87 def bindsocket(self):
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88 import os
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89 try:
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90 uid = os.getuid()
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91 except AttributeError:
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92 uid = 1
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93 if uid == 0:
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94 port = rpc.bindresvport(self.sock, '')
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95 # 'port' is not used
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96 else:
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97 self.sock.bind(('', 0))
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98
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99 # This function is called to cough up a suitable
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100 # authentication object for a call to procedure 'proc'.
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101 def mkcred(self):
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102 if self.cred == None:
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103 self.cred = rpc.AUTH_UNIX, rpc.make_auth_unix_default()
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104 return self.cred
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105
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106 # The methods Mnt, Dump etc. each implement one Remote
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107 # Procedure Call. This is done by calling self.make_call()
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108 # with as arguments:
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109 #
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110 # - the procedure number
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111 # - the arguments (or None)
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112 # - the "packer" function for the arguments (or None)
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113 # - the "unpacker" function for the return value (or None)
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114 #
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115 # The packer and unpacker function, if not None, *must* be
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116 # methods of self.packer and self.unpacker, respectively.
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117 # A value of None means that there are no arguments or is no
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118 # return value, respectively.
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119 #
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120 # The return value from make_call() is the return value from
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121 # the remote procedure call, as unpacked by the "unpacker"
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122 # function, or None if the unpacker function is None.
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123 #
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124 # (Even if you expect a result of None, you should still
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125 # return the return value from make_call(), since this may be
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126 # needed by a broadcasting version of the class.)
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127 #
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128 # If the call fails, make_call() raises an exception
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129 # (this includes time-outs and invalid results).
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130 #
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131 # Note that (at least with the UDP protocol) there is no
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132 # guarantee that a call is executed at most once. When you do
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133 # get a reply, you know it has been executed at least once;
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134 # when you don't get a reply, you know nothing.
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135
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136 def Mnt(self, directory):
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137 return self.make_call(1, directory, \
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138 self.packer.pack_string, \
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139 self.unpacker.unpack_fhstatus)
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140
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141 def Dump(self):
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142 return self.make_call(2, None, \
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143 None, self.unpacker.unpack_mountlist)
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144
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145 def Umnt(self, directory):
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146 return self.make_call(3, directory, \
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147 self.packer.pack_string, None)
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148
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149 def Umntall(self):
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150 return self.make_call(4, None, None, None)
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151
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152 def Export(self):
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153 return self.make_call(5, None, \
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154 None, self.unpacker.unpack_exportlist)
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155
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156
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157 # We turn the partial Mount client into a full one for either protocol
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158 # by use of multiple inheritance. (In general, when class C has base
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159 # classes B1...Bn, if x is an instance of class C, methods of x are
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160 # searched first in C, then in B1, then in B2, ..., finally in Bn.)
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161
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162 class TCPMountClient(PartialMountClient, TCPClient):
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163
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164 def __init__(self, host):
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165 TCPClient.__init__(self, host, MOUNTPROG, MOUNTVERS)
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166
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167
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168 class UDPMountClient(PartialMountClient, UDPClient):
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169
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170 def __init__(self, host):
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171 UDPClient.__init__(self, host, MOUNTPROG, MOUNTVERS)
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172
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173
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174 # A little test program for the Mount client. This takes a host as
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175 # command line argument (default the local machine), prints its export
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176 # list, and attempts to mount and unmount each exported files system.
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177 # An optional first argument of -t or -u specifies the protocol to use
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178 # (TCP or UDP), default is UDP.
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179
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180 def test():
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181 import sys
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182 if sys.argv[1:] and sys.argv[1] == '-t':
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183 C = TCPMountClient
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184 del sys.argv[1]
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185 elif sys.argv[1:] and sys.argv[1] == '-u':
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186 C = UDPMountClient
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187 del sys.argv[1]
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188 else:
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189 C = UDPMountClient
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190 if sys.argv[1:]: host = sys.argv[1]
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191 else: host = ''
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192 mcl = C(host)
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193 list = mcl.Export()
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194 for item in list:
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195 print item
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196 try:
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197 mcl.Mnt(item[0])
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198 except:
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199 print 'Sorry'
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200 continue
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201 mcl.Umnt(item[0])