Mercurial > hg
annotate mercurial/obsolete.py @ 19273:f3effc499288
run-tests: add abort flag
This will be used to help threads clean up gracefully
author | Matt Mackall <mpm@selenic.com> |
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date | Sun, 02 Jun 2013 16:29:35 -0500 |
parents | d5f968f7716f |
children | f4a0f6dd95a3 |
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1 # obsolete.py - obsolete markers handling |
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2 # |
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3 # Copyright 2012 Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
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4 # Logilab SA <contact@logilab.fr> |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
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7 # GNU General Public License version 2 or any later version. |
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8 |
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9 """Obsolete markers handling |
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10 |
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11 An obsolete marker maps an old changeset to a list of new |
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12 changesets. If the list of new changesets is empty, the old changeset |
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13 is said to be "killed". Otherwise, the old changeset is being |
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14 "replaced" by the new changesets. |
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15 |
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16 Obsolete markers can be used to record and distribute changeset graph |
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17 transformations performed by history rewriting operations, and help |
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18 building new tools to reconciliate conflicting rewriting actions. To |
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19 facilitate conflicts resolution, markers include various annotations |
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20 besides old and news changeset identifiers, such as creation date or |
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21 author name. |
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22 |
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23 The old obsoleted changeset is called "precursor" and possible replacements are |
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24 called "successors". Markers that used changeset X as a precursors are called |
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25 "successor markers of X" because they hold information about the successors of |
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26 X. Markers that use changeset Y as a successors are call "precursor markers of |
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27 Y" because they hold information about the precursors of Y. |
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28 |
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29 Examples: |
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30 |
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31 - When changeset A is replacement by a changeset A', one marker is stored: |
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32 |
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33 (A, (A')) |
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34 |
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35 - When changesets A and B are folded into a new changeset C two markers are |
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36 stored: |
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37 |
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38 (A, (C,)) and (B, (C,)) |
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39 |
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40 - When changeset A is simply "pruned" from the graph, a marker in create: |
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41 |
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42 (A, ()) |
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43 |
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44 - When changeset A is split into B and C, a single marker are used: |
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45 |
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46 (A, (C, C)) |
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47 |
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48 We use a single marker to distinct the "split" case from the "divergence" |
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49 case. If two independents operation rewrite the same changeset A in to A' and |
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50 A'' when have an error case: divergent rewriting. We can detect it because |
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51 two markers will be created independently: |
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52 |
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53 (A, (B,)) and (A, (C,)) |
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54 |
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55 Format |
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56 ------ |
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57 |
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58 Markers are stored in an append-only file stored in |
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59 '.hg/store/obsstore'. |
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60 |
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61 The file starts with a version header: |
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62 |
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63 - 1 unsigned byte: version number, starting at zero. |
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64 |
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65 |
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66 The header is followed by the markers. Each marker is made of: |
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67 |
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68 - 1 unsigned byte: number of new changesets "R", could be zero. |
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69 |
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70 - 1 unsigned 32-bits integer: metadata size "M" in bytes. |
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71 |
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72 - 1 byte: a bit field. It is reserved for flags used in obsolete |
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73 markers common operations, to avoid repeated decoding of metadata |
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74 entries. |
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75 |
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76 - 20 bytes: obsoleted changeset identifier. |
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77 |
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78 - N*20 bytes: new changesets identifiers. |
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79 |
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80 - M bytes: metadata as a sequence of nul-terminated strings. Each |
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81 string contains a key and a value, separated by a color ':', without |
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82 additional encoding. Keys cannot contain '\0' or ':' and values |
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83 cannot contain '\0'. |
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84 """ |
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85 import struct |
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86 import util, base85, node |
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87 from i18n import _ |
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88 |
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89 _pack = struct.pack |
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90 _unpack = struct.unpack |
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91 |
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92 _SEEK_END = 2 # os.SEEK_END was introduced in Python 2.5 |
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93 |
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94 # the obsolete feature is not mature enough to be enabled by default. |
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95 # you have to rely on third party extension extension to enable this. |
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96 _enabled = False |
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97 |
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98 # data used for parsing and writing |
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99 _fmversion = 0 |
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100 _fmfixed = '>BIB20s' |
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101 _fmnode = '20s' |
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102 _fmfsize = struct.calcsize(_fmfixed) |
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103 _fnodesize = struct.calcsize(_fmnode) |
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104 |
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105 ### obsolescence marker flag |
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106 |
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107 ## bumpedfix flag |
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108 # |
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109 # When a changeset A' succeed to a changeset A which became public, we call A' |
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110 # "bumped" because it's a successors of a public changesets |
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111 # |
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112 # o A' (bumped) |
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113 # |`: |
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114 # | o A |
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115 # |/ |
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116 # o Z |
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117 # |
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118 # The way to solve this situation is to create a new changeset Ad as children |
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119 # of A. This changeset have the same content than A'. So the diff from A to A' |
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120 # is the same than the diff from A to Ad. Ad is marked as a successors of A' |
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121 # |
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122 # o Ad |
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123 # |`: |
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124 # | x A' |
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125 # |'| |
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126 # o | A |
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127 # |/ |
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128 # o Z |
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129 # |
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130 # But by transitivity Ad is also a successors of A. To avoid having Ad marked |
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131 # as bumped too, we add the `bumpedfix` flag to the marker. <A', (Ad,)>. |
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132 # This flag mean that the successors express the changes between the public and |
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133 # bumped version and fix the situation, breaking the transitivity of |
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134 # "bumped" here. |
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135 bumpedfix = 1 |
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136 |
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137 def _readmarkers(data): |
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138 """Read and enumerate markers from raw data""" |
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139 off = 0 |
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140 diskversion = _unpack('>B', data[off:off + 1])[0] |
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141 off += 1 |
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142 if diskversion != _fmversion: |
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143 raise util.Abort(_('parsing obsolete marker: unknown version %r') |
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144 % diskversion) |
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145 |
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146 # Loop on markers |
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147 l = len(data) |
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148 while off + _fmfsize <= l: |
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149 # read fixed part |
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150 cur = data[off:off + _fmfsize] |
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151 off += _fmfsize |
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152 nbsuc, mdsize, flags, pre = _unpack(_fmfixed, cur) |
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153 # read replacement |
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154 sucs = () |
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155 if nbsuc: |
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156 s = (_fnodesize * nbsuc) |
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157 cur = data[off:off + s] |
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158 sucs = _unpack(_fmnode * nbsuc, cur) |
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159 off += s |
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160 # read metadata |
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161 # (metadata will be decoded on demand) |
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162 metadata = data[off:off + mdsize] |
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163 if len(metadata) != mdsize: |
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164 raise util.Abort(_('parsing obsolete marker: metadata is too ' |
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165 'short, %d bytes expected, got %d') |
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166 % (mdsize, len(metadata))) |
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167 off += mdsize |
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168 yield (pre, sucs, flags, metadata) |
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169 |
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170 def encodemeta(meta): |
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171 """Return encoded metadata string to string mapping. |
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172 |
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173 Assume no ':' in key and no '\0' in both key and value.""" |
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174 for key, value in meta.iteritems(): |
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175 if ':' in key or '\0' in key: |
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176 raise ValueError("':' and '\0' are forbidden in metadata key'") |
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177 if '\0' in value: |
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178 raise ValueError("':' are forbidden in metadata value'") |
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179 return '\0'.join(['%s:%s' % (k, meta[k]) for k in sorted(meta)]) |
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180 |
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181 def decodemeta(data): |
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182 """Return string to string dictionary from encoded version.""" |
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183 d = {} |
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184 for l in data.split('\0'): |
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185 if l: |
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186 key, value = l.split(':') |
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187 d[key] = value |
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188 return d |
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189 |
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190 class marker(object): |
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191 """Wrap obsolete marker raw data""" |
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192 |
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193 def __init__(self, repo, data): |
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194 # the repo argument will be used to create changectx in later version |
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195 self._repo = repo |
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196 self._data = data |
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197 self._decodedmeta = None |
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198 |
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199 def precnode(self): |
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200 """Precursor changeset node identifier""" |
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201 return self._data[0] |
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202 |
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203 def succnodes(self): |
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204 """List of successor changesets node identifiers""" |
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205 return self._data[1] |
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206 |
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207 def metadata(self): |
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208 """Decoded metadata dictionary""" |
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209 if self._decodedmeta is None: |
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210 self._decodedmeta = decodemeta(self._data[3]) |
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211 return self._decodedmeta |
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212 |
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213 def date(self): |
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214 """Creation date as (unixtime, offset)""" |
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215 parts = self.metadata()['date'].split(' ') |
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216 return (float(parts[0]), int(parts[1])) |
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217 |
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218 class obsstore(object): |
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219 """Store obsolete markers |
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220 |
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221 Markers can be accessed with two mappings: |
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222 - precursors[x] -> set(markers on precursors edges of x) |
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223 - successors[x] -> set(markers on successors edges of x) |
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224 """ |
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225 |
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226 def __init__(self, sopener): |
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227 # caches for various obsolescence related cache |
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228 self.caches = {} |
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229 self._all = [] |
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230 # new markers to serialize |
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231 self.precursors = {} |
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232 self.successors = {} |
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233 self.sopener = sopener |
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234 data = sopener.tryread('obsstore') |
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235 if data: |
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236 self._load(_readmarkers(data)) |
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237 |
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238 def __iter__(self): |
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239 return iter(self._all) |
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240 |
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241 def __nonzero__(self): |
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242 return bool(self._all) |
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243 |
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244 def create(self, transaction, prec, succs=(), flag=0, metadata=None): |
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245 """obsolete: add a new obsolete marker |
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246 |
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247 * ensuring it is hashable |
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248 * check mandatory metadata |
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249 * encode metadata |
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250 """ |
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251 if metadata is None: |
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252 metadata = {} |
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253 if 'date' not in metadata: |
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254 metadata['date'] = "%d %d" % util.makedate() |
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255 if len(prec) != 20: |
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256 raise ValueError(prec) |
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257 for succ in succs: |
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258 if len(succ) != 20: |
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259 raise ValueError(succ) |
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260 marker = (str(prec), tuple(succs), int(flag), encodemeta(metadata)) |
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261 self.add(transaction, [marker]) |
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262 |
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263 def add(self, transaction, markers): |
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264 """Add new markers to the store |
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265 |
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266 Take care of filtering duplicate. |
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267 Return the number of new marker.""" |
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268 if not _enabled: |
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269 raise util.Abort('obsolete feature is not enabled on this repo') |
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270 new = [m for m in markers if m not in self._all] |
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271 if new: |
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272 f = self.sopener('obsstore', 'ab') |
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273 try: |
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274 # Whether the file's current position is at the begin or at |
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275 # the end after opening a file for appending is implementation |
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276 # defined. So we must seek to the end before calling tell(), |
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277 # or we may get a zero offset for non-zero sized files on |
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278 # some platforms (issue3543). |
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279 f.seek(0, _SEEK_END) |
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280 offset = f.tell() |
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281 transaction.add('obsstore', offset) |
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282 # offset == 0: new file - add the version header |
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283 for bytes in _encodemarkers(new, offset == 0): |
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284 f.write(bytes) |
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285 finally: |
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286 # XXX: f.close() == filecache invalidation == obsstore rebuilt. |
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287 # call 'filecacheentry.refresh()' here |
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288 f.close() |
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289 self._load(new) |
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290 # new marker *may* have changed several set. invalidate the cache. |
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291 self.caches.clear() |
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292 return len(new) |
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293 |
17524 | 294 def mergemarkers(self, transaction, data): |
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295 markers = _readmarkers(data) |
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297 |
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298 def _load(self, markers): |
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299 for mark in markers: |
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300 self._all.append(mark) |
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301 pre, sucs = mark[:2] |
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302 self.successors.setdefault(pre, set()).add(mark) |
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303 for suc in sucs: |
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304 self.precursors.setdefault(suc, set()).add(mark) |
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305 if node.nullid in self.precursors: |
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306 raise util.Abort(_('bad obsolescence marker detected: ' |
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307 'invalid successors nullid')) |
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308 |
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309 def _encodemarkers(markers, addheader=False): |
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310 # Kept separate from flushmarkers(), it will be reused for |
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311 # markers exchange. |
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312 if addheader: |
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313 yield _pack('>B', _fmversion) |
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314 for marker in markers: |
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315 yield _encodeonemarker(marker) |
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316 |
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317 |
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318 def _encodeonemarker(marker): |
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319 pre, sucs, flags, metadata = marker |
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320 nbsuc = len(sucs) |
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321 format = _fmfixed + (_fmnode * nbsuc) |
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322 data = [nbsuc, len(metadata), flags, pre] |
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323 data.extend(sucs) |
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324 return _pack(format, *data) + metadata |
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325 |
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326 # arbitrary picked to fit into 8K limit from HTTP server |
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327 # you have to take in account: |
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328 # - the version header |
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329 # - the base85 encoding |
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330 _maxpayload = 5300 |
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331 |
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332 def listmarkers(repo): |
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333 """List markers over pushkey""" |
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334 if not repo.obsstore: |
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335 return {} |
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336 keys = {} |
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337 parts = [] |
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338 currentlen = _maxpayload * 2 # ensure we create a new part |
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339 for marker in repo.obsstore: |
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340 nextdata = _encodeonemarker(marker) |
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341 if (len(nextdata) + currentlen > _maxpayload): |
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342 currentpart = [] |
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343 currentlen = 0 |
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344 parts.append(currentpart) |
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345 currentpart.append(nextdata) |
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346 currentlen += len(nextdata) |
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347 for idx, part in enumerate(reversed(parts)): |
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348 data = ''.join([_pack('>B', _fmversion)] + part) |
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349 keys['dump%i' % idx] = base85.b85encode(data) |
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350 return keys |
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351 |
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352 def pushmarker(repo, key, old, new): |
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353 """Push markers over pushkey""" |
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354 if not key.startswith('dump'): |
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355 repo.ui.warn(_('unknown key: %r') % key) |
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356 return 0 |
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357 if old: |
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358 repo.ui.warn(_('unexpected old value') % key) |
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359 return 0 |
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360 data = base85.b85decode(new) |
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361 lock = repo.lock() |
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362 try: |
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363 tr = repo.transaction('pushkey: obsolete markers') |
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364 try: |
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365 repo.obsstore.mergemarkers(tr, data) |
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366 tr.close() |
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367 return 1 |
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368 finally: |
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369 tr.release() |
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370 finally: |
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371 lock.release() |
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372 |
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373 def syncpush(repo, remote): |
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374 """utility function to push bookmark to a remote |
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375 |
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376 Exist mostly to allow overridding for experimentation purpose""" |
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377 if (_enabled and repo.obsstore and |
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378 'obsolete' in remote.listkeys('namespaces')): |
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379 rslts = [] |
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380 remotedata = repo.listkeys('obsolete') |
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381 for key in sorted(remotedata, reverse=True): |
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382 # reverse sort to ensure we end with dump0 |
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383 data = remotedata[key] |
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384 rslts.append(remote.pushkey('obsolete', key, '', data)) |
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385 if [r for r in rslts if not r]: |
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386 msg = _('failed to push some obsolete markers!\n') |
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387 repo.ui.warn(msg) |
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388 |
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389 def syncpull(repo, remote, gettransaction): |
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390 """utility function to pull bookmark to a remote |
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391 |
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392 The `gettransaction` is function that return the pull transaction, creating |
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393 one if necessary. We return the transaction to inform the calling code that |
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394 a new transaction have been created (when applicable). |
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395 |
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396 Exists mostly to allow overridding for experimentation purpose""" |
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397 tr = None |
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398 if _enabled: |
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399 repo.ui.debug('fetching remote obsolete markers\n') |
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400 remoteobs = remote.listkeys('obsolete') |
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401 if 'dump0' in remoteobs: |
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402 tr = gettransaction() |
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403 for key in sorted(remoteobs, reverse=True): |
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404 if key.startswith('dump'): |
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405 data = base85.b85decode(remoteobs[key]) |
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406 repo.obsstore.mergemarkers(tr, data) |
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407 repo.invalidatevolatilesets() |
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408 return tr |
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409 |
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410 def allmarkers(repo): |
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411 """all obsolete markers known in a repository""" |
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412 for markerdata in repo.obsstore: |
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413 yield marker(repo, markerdata) |
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414 |
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415 def precursormarkers(ctx): |
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416 """obsolete marker marking this changeset as a successors""" |
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417 for data in ctx._repo.obsstore.precursors.get(ctx.node(), ()): |
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418 yield marker(ctx._repo, data) |
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419 |
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420 def successormarkers(ctx): |
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421 """obsolete marker making this changeset obsolete""" |
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422 for data in ctx._repo.obsstore.successors.get(ctx.node(), ()): |
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423 yield marker(ctx._repo, data) |
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424 |
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425 def allsuccessors(obsstore, nodes, ignoreflags=0): |
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426 """Yield node for every successor of <nodes>. |
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427 |
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428 Some successors may be unknown locally. |
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429 |
17537 | 430 This is a linear yield unsuited to detecting split changesets.""" |
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431 remaining = set(nodes) |
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432 seen = set(remaining) |
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433 while remaining: |
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434 current = remaining.pop() |
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435 yield current |
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436 for mark in obsstore.successors.get(current, ()): |
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437 # ignore marker flagged with with specified flag |
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438 if mark[2] & ignoreflags: |
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439 continue |
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440 for suc in mark[1]: |
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441 if suc not in seen: |
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442 seen.add(suc) |
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443 remaining.add(suc) |
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444 |
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445 def foreground(repo, nodes): |
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446 """return all nodes in the "foreground" of other node |
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447 |
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448 The foreground of a revision is anything reachable using parent -> children |
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449 or precursor -> sucessor relation. It is very similars to "descendant" but |
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450 augmented with obsolescence information. |
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451 |
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452 Beware that possible obsolescence cycle may result if complexe situation. |
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453 """ |
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454 repo = repo.unfiltered() |
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455 foreground = set(repo.set('%ln::', nodes)) |
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456 if repo.obsstore: |
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457 # We only need this complicated logic if there is obsolescence |
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458 # XXX will probably deserve an optimised revset. |
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459 nm = repo.changelog.nodemap |
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460 plen = -1 |
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461 # compute the whole set of successors or descendants |
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462 while len(foreground) != plen: |
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463 plen = len(foreground) |
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464 succs = set(c.node() for c in foreground) |
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465 mutable = [c.node() for c in foreground if c.mutable()] |
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466 succs.update(allsuccessors(repo.obsstore, mutable)) |
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467 known = (n for n in succs if n in nm) |
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468 foreground = set(repo.set('%ln::', known)) |
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469 return set(c.node() for c in foreground) |
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470 |
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471 |
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472 def successorssets(repo, initialnode, cache=None): |
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473 """Return all set of successors of initial nodes |
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474 |
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475 Successors set of changeset A are a group of revision that succeed A. It |
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476 succeed A as a consistent whole, each revision being only partial |
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477 replacement. Successors set contains non-obsolete changeset only. |
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478 |
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479 In most cases a changeset A have zero (changeset pruned) or a single |
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480 successors set that contains a single successor (changeset A replaced by |
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481 A') |
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482 |
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483 When changeset is split, it results successors set containing more than |
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484 a single element. Divergent rewriting will result in multiple successors |
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485 sets. |
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486 |
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487 They are returned as a list of tuples containing all valid successors sets. |
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488 |
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489 Final successors unknown locally are considered plain prune (obsoleted |
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490 without successors). |
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491 |
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492 The optional `cache` parameter is a dictionary that may contains |
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493 precomputed successors sets. It is meant to reuse the computation of |
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494 previous call to `successorssets` when multiple calls are made at the same |
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495 time. The cache dictionary is updated in place. The caller is responsible |
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496 for its live spawn. Code that makes multiple calls to `successorssets` |
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497 *must* use this cache mechanism or suffer terrible performances.""" |
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498 |
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499 succmarkers = repo.obsstore.successors |
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500 |
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501 # Stack of nodes we search successors sets for |
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502 toproceed = [initialnode] |
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503 # set version of above list for fast loop detection |
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504 # element added to "toproceed" must be added here |
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505 stackedset = set(toproceed) |
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506 if cache is None: |
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507 cache = {} |
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508 |
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509 # This while loop is the flattened version of a recursive search for |
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510 # successors sets |
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511 # |
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512 # def successorssets(x): |
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513 # successors = directsuccessors(x) |
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514 # ss = [[]] |
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515 # for succ in directsuccessors(x): |
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516 # # product as in itertools cartesian product |
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517 # ss = product(ss, successorssets(succ)) |
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518 # return ss |
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519 # |
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520 # But we can not use plain recursive calls here: |
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521 # - that would blow the python call stack |
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522 # - obsolescence markers may have cycles, we need to handle them. |
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523 # |
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524 # The `toproceed` list act as our call stack. Every node we search |
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525 # successors set for are stacked there. |
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526 # |
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527 # The `stackedset` is set version of this stack used to check if a node is |
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528 # already stacked. This check is used to detect cycles and prevent infinite |
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529 # loop. |
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530 # |
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531 # successors set of all nodes are stored in the `cache` dictionary. |
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532 # |
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533 # After this while loop ends we use the cache to return the successors sets |
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534 # for the node requested by the caller. |
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535 while toproceed: |
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536 # Every iteration tries to compute the successors sets of the topmost |
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537 # node of the stack: CURRENT. |
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538 # |
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539 # There are four possible outcomes: |
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540 # |
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541 # 1) We already know the successors sets of CURRENT: |
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542 # -> mission accomplished, pop it from the stack. |
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543 # 2) Node is not obsolete: |
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544 # -> the node is its own successors sets. Add it to the cache. |
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545 # 3) We do not know successors set of direct successors of CURRENT: |
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546 # -> We add those successors to the stack. |
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547 # 4) We know successors sets of all direct successors of CURRENT: |
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548 # -> We can compute CURRENT successors set and add it to the |
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549 # cache. |
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550 # |
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551 current = toproceed[-1] |
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552 if current in cache: |
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553 # case (1): We already know the successors sets |
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554 stackedset.remove(toproceed.pop()) |
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555 elif current not in succmarkers: |
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556 # case (2): The node is not obsolete. |
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557 if current in repo: |
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558 # We have a valid last successors. |
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559 cache[current] = [(current,)] |
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560 else: |
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561 # Final obsolete version is unknown locally. |
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562 # Do not count that as a valid successors |
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563 cache[current] = [] |
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564 else: |
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565 # cases (3) and (4) |
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566 # |
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567 # We proceed in two phases. Phase 1 aims to distinguish case (3) |
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568 # from case (4): |
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569 # |
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570 # For each direct successors of CURRENT, we check whether its |
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571 # successors sets are known. If they are not, we stack the |
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572 # unknown node and proceed to the next iteration of the while |
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573 # loop. (case 3) |
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574 # |
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575 # During this step, we may detect obsolescence cycles: a node |
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576 # with unknown successors sets but already in the call stack. |
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577 # In such a situation, we arbitrary set the successors sets of |
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578 # the node to nothing (node pruned) to break the cycle. |
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579 # |
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580 # If no break was encountered we proceed to phase 2. |
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581 # |
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582 # Phase 2 computes successors sets of CURRENT (case 4); see details |
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583 # in phase 2 itself. |
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584 # |
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585 # Note the two levels of iteration in each phase. |
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586 # - The first one handles obsolescence markers using CURRENT as |
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587 # precursor (successors markers of CURRENT). |
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588 # |
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589 # Having multiple entry here means divergence. |
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590 # |
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591 # - The second one handles successors defined in each marker. |
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592 # |
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593 # Having none means pruned node, multiple successors means split, |
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594 # single successors are standard replacement. |
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595 # |
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596 for mark in sorted(succmarkers[current]): |
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597 for suc in mark[1]: |
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598 if suc not in cache: |
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599 if suc in stackedset: |
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600 # cycle breaking |
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601 cache[suc] = [] |
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602 else: |
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603 # case (3) If we have not computed successors sets |
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604 # of one of those successors we add it to the |
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605 # `toproceed` stack and stop all work for this |
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606 # iteration. |
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607 toproceed.append(suc) |
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608 stackedset.add(suc) |
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609 break |
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610 else: |
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611 continue |
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612 break |
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613 else: |
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614 # case (4): we know all successors sets of all direct |
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615 # successors |
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616 # |
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617 # Successors set contributed by each marker depends on the |
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618 # successors sets of all its "successors" node. |
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619 # |
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620 # Each different marker is a divergence in the obsolescence |
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621 # history. It contributes successors sets distinct from other |
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622 # markers. |
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623 # |
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624 # Within a marker, a successor may have divergent successors |
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625 # sets. In such a case, the marker will contribute multiple |
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626 # divergent successors sets. If multiple successors have |
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627 # divergent successors sets, a cartesian product is used. |
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628 # |
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629 # At the end we post-process successors sets to remove |
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630 # duplicated entry and successors set that are strict subset of |
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631 # another one. |
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632 succssets = [] |
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633 for mark in sorted(succmarkers[current]): |
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634 # successors sets contributed by this marker |
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635 markss = [[]] |
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636 for suc in mark[1]: |
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637 # cardinal product with previous successors |
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638 productresult = [] |
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639 for prefix in markss: |
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640 for suffix in cache[suc]: |
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641 newss = list(prefix) |
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642 for part in suffix: |
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643 # do not duplicated entry in successors set |
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644 # first entry wins. |
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645 if part not in newss: |
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646 newss.append(part) |
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647 productresult.append(newss) |
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648 markss = productresult |
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649 succssets.extend(markss) |
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650 # remove duplicated and subset |
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651 seen = [] |
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652 final = [] |
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653 candidate = sorted(((set(s), s) for s in succssets if s), |
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654 key=lambda x: len(x[1]), reverse=True) |
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655 for setversion, listversion in candidate: |
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656 for seenset in seen: |
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657 if setversion.issubset(seenset): |
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658 break |
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659 else: |
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660 final.append(listversion) |
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661 seen.append(setversion) |
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662 final.reverse() # put small successors set first |
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663 cache[current] = final |
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664 return cache[initialnode] |
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665 |
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666 def _knownrevs(repo, nodes): |
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667 """yield revision numbers of known nodes passed in parameters |
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668 |
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669 Unknown revisions are silently ignored.""" |
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670 torev = repo.changelog.nodemap.get |
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671 for n in nodes: |
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672 rev = torev(n) |
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673 if rev is not None: |
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674 yield rev |
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675 |
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676 # mapping of 'set-name' -> <function to compute this set> |
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677 cachefuncs = {} |
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678 def cachefor(name): |
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679 """Decorator to register a function as computing the cache for a set""" |
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680 def decorator(func): |
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681 assert name not in cachefuncs |
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682 cachefuncs[name] = func |
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683 return func |
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684 return decorator |
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685 |
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686 def getrevs(repo, name): |
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687 """Return the set of revision that belong to the <name> set |
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688 |
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689 Such access may compute the set and cache it for future use""" |
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690 repo = repo.unfiltered() |
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691 if not repo.obsstore: |
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692 return () |
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693 if name not in repo.obsstore.caches: |
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694 repo.obsstore.caches[name] = cachefuncs[name](repo) |
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695 return repo.obsstore.caches[name] |
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696 |
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697 # To be simple we need to invalidate obsolescence cache when: |
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698 # |
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699 # - new changeset is added: |
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700 # - public phase is changed |
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701 # - obsolescence marker are added |
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702 # - strip is used a repo |
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703 def clearobscaches(repo): |
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704 """Remove all obsolescence related cache from a repo |
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705 |
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706 This remove all cache in obsstore is the obsstore already exist on the |
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707 repo. |
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708 |
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709 (We could be smarter here given the exact event that trigger the cache |
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710 clearing)""" |
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711 # only clear cache is there is obsstore data in this repo |
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712 if 'obsstore' in repo._filecache: |
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713 repo.obsstore.caches.clear() |
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714 |
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715 @cachefor('obsolete') |
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716 def _computeobsoleteset(repo): |
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717 """the set of obsolete revisions""" |
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718 obs = set() |
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719 getrev = repo.changelog.nodemap.get |
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720 getphase = repo._phasecache.phase |
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721 for node in repo.obsstore.successors: |
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722 rev = getrev(node) |
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723 if rev is not None and getphase(repo, rev): |
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724 obs.add(rev) |
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725 return obs |
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726 |
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727 @cachefor('unstable') |
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728 def _computeunstableset(repo): |
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729 """the set of non obsolete revisions with obsolete parents""" |
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730 # revset is not efficient enough here |
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731 # we do (obsolete()::) - obsolete() by hand |
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732 obs = getrevs(repo, 'obsolete') |
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733 if not obs: |
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734 return set() |
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735 cl = repo.changelog |
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736 return set(r for r in cl.descendants(obs) if r not in obs) |
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737 |
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738 @cachefor('suspended') |
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739 def _computesuspendedset(repo): |
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740 """the set of obsolete parents with non obsolete descendants""" |
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741 suspended = repo.changelog.ancestors(getrevs(repo, 'unstable')) |
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742 return set(r for r in getrevs(repo, 'obsolete') if r in suspended) |
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743 |
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744 @cachefor('extinct') |
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745 def _computeextinctset(repo): |
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746 """the set of obsolete parents without non obsolete descendants""" |
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747 return getrevs(repo, 'obsolete') - getrevs(repo, 'suspended') |
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748 |
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749 |
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750 @cachefor('bumped') |
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|
751 def _computebumpedset(repo): |
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752 """the set of revs trying to obsolete public revisions""" |
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753 # get all possible bumped changesets |
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754 tonode = repo.changelog.node |
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|
755 publicnodes = (tonode(r) for r in repo.revs('public()')) |
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756 successors = allsuccessors(repo.obsstore, publicnodes, |
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|
757 ignoreflags=bumpedfix) |
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|
758 # revision public or already obsolete don't count as bumped |
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759 query = '%ld - obsolete() - public()' |
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760 return set(repo.revs(query, _knownrevs(repo, successors))) |
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|
761 |
18070
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762 @cachefor('divergent') |
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763 def _computedivergentset(repo): |
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764 """the set of rev that compete to be the final successors of some revision. |
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|
765 """ |
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|
766 divergent = set() |
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767 obsstore = repo.obsstore |
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768 newermap = {} |
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|
769 for ctx in repo.set('(not public()) - obsolete()'): |
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770 mark = obsstore.precursors.get(ctx.node(), ()) |
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771 toprocess = set(mark) |
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772 while toprocess: |
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773 prec = toprocess.pop()[0] |
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|
774 if prec not in newermap: |
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|
775 successorssets(repo, prec, newermap) |
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776 newer = [n for n in newermap[prec] if n] |
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|
777 if len(newer) > 1: |
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778 divergent.add(ctx.rev()) |
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|
779 break |
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|
780 toprocess.update(obsstore.precursors.get(prec, ())) |
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781 return divergent |
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782 |
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783 |
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|
784 def createmarkers(repo, relations, flag=0, metadata=None): |
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785 """Add obsolete markers between changesets in a repo |
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786 |
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787 <relations> must be an iterable of (<old>, (<new>, ...)) tuple. |
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788 `old` and `news` are changectx. |
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789 |
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790 Trying to obsolete a public changeset will raise an exception. |
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791 |
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792 Current user and date are used except if specified otherwise in the |
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793 metadata attribute. |
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794 |
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795 This function operates within a transaction of its own, but does |
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796 not take any lock on the repo. |
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797 """ |
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798 # prepare metadata |
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799 if metadata is None: |
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800 metadata = {} |
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801 if 'date' not in metadata: |
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802 metadata['date'] = '%i %i' % util.makedate() |
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803 if 'user' not in metadata: |
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804 metadata['user'] = repo.ui.username() |
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805 tr = repo.transaction('add-obsolescence-marker') |
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806 try: |
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807 for prec, sucs in relations: |
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808 if not prec.mutable(): |
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809 raise util.Abort("cannot obsolete immutable changeset: %s" |
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810 % prec) |
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811 nprec = prec.node() |
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812 nsucs = tuple(s.node() for s in sucs) |
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813 if nprec in nsucs: |
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814 raise util.Abort("changeset %s cannot obsolete itself" % prec) |
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815 repo.obsstore.create(tr, nprec, nsucs, flag, metadata) |
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816 repo.filteredrevcache.clear() |
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817 tr.close() |
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818 finally: |
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819 tr.release() |