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annotate mercurial/bundle2.py @ 20803:88db3e615319

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bundle2: make sure the unbundler refuse non bundle2 stream We now make use of the magic string at the beginning of the file.
author Pierre-Yves David <pierre-yves.david@fb.com>
date Tue, 18 Mar 2014 16:35:34 -0700
parents 520df53ad26a
children db9d3991d2c6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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20801
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1 # bundle2.py - generic container format to transmit arbitrary data.
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2 #
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3 # Copyright 2013 Facebook, Inc.
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7 """Handling of the new bundle2 format
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8
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9 The goal of bundle2 is to act as an atomically packet to transmit a set of
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10 payloads in an application agnostic way. It consist in a sequence of "parts"
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11 that will be handed to and processed by the application layer.
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12
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13
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14 General format architecture
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15 ===========================
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16
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17 The format is architectured as follow
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18
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19 - magic string
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20 - stream level parameters
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21 - payload parts (any number)
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22 - end of stream marker.
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23
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24 The current implementation is limited to empty bundle.
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25
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26 Details on the Binary format
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27 ============================
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28
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29 All numbers are unsigned and big endian.
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30
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31 stream level parameters
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32 ------------------------
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33
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34 Binary format is as follow
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35
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36 :params size: (16 bits integer)
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37
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38 The total number of Bytes used by the parameters
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39
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40 Currently force to 0.
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41
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42 :params value: arbitrary number of Bytes
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43
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44 A blob of `params size` containing the serialized version of all stream level
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45 parameters.
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46
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47 Currently always empty.
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48
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49
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50 Payload part
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51 ------------------------
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52
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53 Binary format is as follow
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54
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55 :header size: (16 bits inter)
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56
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57 The total number of Bytes used by the part headers. When the header is empty
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58 (size = 0) this is interpreted as the end of stream marker.
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59
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60 Currently forced to 0 in the current state of the implementation
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61 """
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62
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63 import util
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64 import changegroup
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65 from i18n import _
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66
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67 _magicstring = 'HG20'
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68
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69 class bundle20(object):
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70 """represent an outgoing bundle2 container
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71
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72 People will eventually be able to add param and parts to this object and
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73 generated a stream from it."""
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74
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75 def __init__(self):
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76 self._params = []
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77 self._parts = []
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78
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79 def getchunks(self):
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80 yield _magicstring
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81 # no support for any param yet
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82 # to be obviously fixed soon.
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83 assert not self._params
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84 yield '\0\0'
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85 # no support for parts
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86 # to be obviously fixed soon.
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87 assert not self._parts
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88 yield '\0\0'
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89
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90 class unbundle20(object):
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91 """interpret a bundle2 stream
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92
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93 (this will eventually yield parts)"""
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94
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95 def __init__(self, fp):
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96 self._fp = fp
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97 header = self._readexact(4)
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98 magic, version = header[0:2], header[2:4]
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99 if magic != 'HG':
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100 raise util.Abort(_('not a Mercurial bundle'))
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101 if version != '20':
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102 raise util.Abort(_('unknown bundle version %s') % version)
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103
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104 def _unpack(self, format):
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105 """unpack this struct format from the stream"""
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106 data = self._readexact(struct.calcsize(format))
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107 return _unpack(format, data)
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108
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109 def _readexact(self, size):
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110 """read exactly <size> bytes from the stream"""
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111 return changegroup.readexactly(self._fp, size)
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112
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113 @util.propertycache
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114 def params(self):
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115 """dictionnary of stream level parameters"""
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116 paramsize = self._readexact(2)
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117 assert paramsize == '\0\0'
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118 return {}
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119
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120 def __iter__(self):
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121 """yield all parts contained in the stream"""
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122 # make sure param have been loaded
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123 self.params
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124 part = self._readpart()
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125 while part is not None:
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126 yield part
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127 part = self._readpart()
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128
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129 def _readpart(self):
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130 """return None when an end of stream markers is reach"""
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131 headersize = self._readexact(2)
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132 assert headersize == '\0\0'
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133 return None
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134
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135
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136