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annotate mercurial/help/internals/changegroups.txt @ 30790:dbcc10cf7f8d

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patch: add label for coloring the index extended header Just like the summary says, this will colorize the: index 3d3ba4b65e11..57274a0f46b2 100644 line in the diff output.
author Sean Farley <sean@farley.io>
date Mon, 09 Jan 2017 10:59:45 -0800
parents aba2bb2a6d0f
children 9f169b7f53d5
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1 Changegroups are representations of repository revlog data, specifically
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2 the changelog, manifest, and filelogs.
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3
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4 There are 3 versions of changegroups: ``1``, ``2``, and ``3``. From a
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5 high-level, versions ``1`` and ``2`` are almost exactly the same, with
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6 the only difference being a header on entries in the changeset
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7 segment. Version ``3`` adds support for exchanging treemanifests and
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8 includes revlog flags in the delta header.
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9
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10 Changegroups consists of 3 logical segments::
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11
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12 +---------------------------------+
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13 | | | |
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14 | changeset | manifest | filelogs |
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15 | | | |
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16 +---------------------------------+
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17
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18 The principle building block of each segment is a *chunk*. A *chunk*
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19 is a framed piece of data::
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20
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21 +---------------------------------------+
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22 | | |
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23 | length | data |
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24 | (32 bits) | <length> bytes |
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25 | | |
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26 +---------------------------------------+
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27
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28 Each chunk starts with a 32-bit big-endian signed integer indicating
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29 the length of the raw data that follows.
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30
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31 There is a special case chunk that has 0 length (``0x00000000``). We
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32 call this an *empty chunk*.
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33
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34 Delta Groups
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35 ============
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36
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37 A *delta group* expresses the content of a revlog as a series of deltas,
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38 or patches against previous revisions.
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39
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40 Delta groups consist of 0 or more *chunks* followed by the *empty chunk*
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41 to signal the end of the delta group::
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42
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43 +------------------------------------------------------------------------+
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44 | | | | | |
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45 | chunk0 length | chunk0 data | chunk1 length | chunk1 data | 0x0 |
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46 | (32 bits) | (various) | (32 bits) | (various) | (32 bits) |
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47 | | | | | |
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48 +------------------------------------------------------------+-----------+
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49
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50 Each *chunk*'s data consists of the following::
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51
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52 +-----------------------------------------+
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53 | | | |
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54 | delta header | mdiff header | delta |
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55 | (various) | (12 bytes) | (various) |
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56 | | | |
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57 +-----------------------------------------+
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58
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59 The *length* field is the byte length of the remaining 3 logical pieces
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60 of data. The *delta* is a diff from an existing entry in the changelog.
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61
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62 The *delta header* is different between versions ``1``, ``2``, and
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63 ``3`` of the changegroup format.
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64
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65 Version 1::
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66
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67 +------------------------------------------------------+
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68 | | | | |
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69 | node | p1 node | p2 node | link node |
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70 | (20 bytes) | (20 bytes) | (20 bytes) | (20 bytes) |
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71 | | | | |
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72 +------------------------------------------------------+
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73
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74 Version 2::
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75
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76 +------------------------------------------------------------------+
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77 | | | | | |
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78 | node | p1 node | p2 node | base node | link node |
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79 | (20 bytes) | (20 bytes) | (20 bytes) | (20 bytes) | (20 bytes) |
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80 | | | | | |
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81 +------------------------------------------------------------------+
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82
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83 Version 3::
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84
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85 +------------------------------------------------------------------------------+
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86 | | | | | | |
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87 | node | p1 node | p2 node | base node | link node | flags |
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88 | (20 bytes) | (20 bytes) | (20 bytes) | (20 bytes) | (20 bytes) | (2 bytes) |
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89 | | | | | | |
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90 +------------------------------------------------------------------------------+
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91
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92 The *mdiff header* consists of 3 32-bit big-endian signed integers
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93 describing offsets at which to apply the following delta content::
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94
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95 +-------------------------------------+
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96 | | | |
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97 | offset | old length | new length |
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98 | (32 bits) | (32 bits) | (32 bits) |
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99 | | | |
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100 +-------------------------------------+
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101
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102 In version 1, the delta is always applied against the previous node from
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103 the changegroup or the first parent if this is the first entry in the
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104 changegroup.
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105
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106 In version 2, the delta base node is encoded in the entry in the
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107 changegroup. This allows the delta to be expressed against any parent,
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108 which can result in smaller deltas and more efficient encoding of data.
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109
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110 Changeset Segment
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111 =================
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112
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113 The *changeset segment* consists of a single *delta group* holding
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114 changelog data. It is followed by an *empty chunk* to denote the
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115 boundary to the *manifests segment*.
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116
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117 Manifest Segment
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118 ================
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119
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120 The *manifest segment* consists of a single *delta group* holding
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121 manifest data. It is followed by an *empty chunk* to denote the boundary
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122 to the *filelogs segment*.
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123
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124 Filelogs Segment
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125 ================
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126
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127 The *filelogs* segment consists of multiple sub-segments, each
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128 corresponding to an individual file whose data is being described::
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129
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130 +--------------------------------------+
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131 | | | | |
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132 | filelog0 | filelog1 | filelog2 | ... |
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133 | | | | |
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134 +--------------------------------------+
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135
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136 In version ``3`` of the changegroup format, filelogs may include
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137 directory logs when treemanifests are in use. directory logs are
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138 identified by having a trailing '/' on their filename (see below).
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139
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140 The final filelog sub-segment is followed by an *empty chunk* to denote
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141 the end of the segment and the overall changegroup.
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142
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143 Each filelog sub-segment consists of the following::
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144
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145 +------------------------------------------+
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146 | | | |
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147 | filename size | filename | delta group |
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148 | (32 bits) | (various) | (various) |
a79cba6cb206 help: add documentation for changegroup formats
Gregory Szorc <gregory.szorc@gmail.com>
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149 | | | |
a79cba6cb206 help: add documentation for changegroup formats
Gregory Szorc <gregory.szorc@gmail.com>
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150 +------------------------------------------+
a79cba6cb206 help: add documentation for changegroup formats
Gregory Szorc <gregory.szorc@gmail.com>
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151
a79cba6cb206 help: add documentation for changegroup formats
Gregory Szorc <gregory.szorc@gmail.com>
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152 That is, a *chunk* consisting of the filename (not terminated or padded)
a79cba6cb206 help: add documentation for changegroup formats
Gregory Szorc <gregory.szorc@gmail.com>
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153 followed by N chunks constituting the *delta group* for this file.