Mercurial > hg
annotate mercurial/obsolete.py @ 22178:70383c6961b4 stable
discovery: prevent crash on unknown remote heads with old repo (issue4337)
When a remote is not capable of the `branchmap` wireproto command, we denote
incoming heads with None. This leads to a crash in the code in charge of
displaying the list of unknown remote heads.
We now properly detect this case and display a shorter message in this case.
The reason for this `set([None])` value is now documented.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Thu, 14 Aug 2014 16:26:41 -0700 |
parents | a56038e6a3c9 |
children | 8dda6f6ff564 |
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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 marker 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 rewrite operations, and help |
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18 building new tools to reconcile conflicting rewrite actions. To |
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19 facilitate conflict 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 a "precursor" and possible |
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24 replacements are called "successors". Markers that used changeset X as |
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25 a precursor are called "successor markers of X" because they hold |
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26 information about the successors of X. Markers that use changeset Y as |
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27 a successors are call "precursor markers of Y" because they hold |
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28 information about the precursors of Y. |
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29 |
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30 Examples: |
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31 |
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32 - When changeset A is replaced by changeset A', one marker is stored: |
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33 |
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34 (A, (A',)) |
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35 |
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36 - When changesets A and B are folded into a new changeset C, two markers are |
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37 stored: |
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38 |
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39 (A, (C,)) and (B, (C,)) |
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40 |
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41 - When changeset A is simply "pruned" from the graph, a marker is created: |
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42 |
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43 (A, ()) |
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44 |
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45 - When changeset A is split into B and C, a single marker are used: |
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46 |
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47 (A, (C, C)) |
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48 |
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49 We use a single marker to distinguish the "split" case from the "divergence" |
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50 case. If two independent operations rewrite the same changeset A in to A' and |
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51 A'', we have an error case: divergent rewriting. We can detect it because |
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52 two markers will be created independently: |
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53 |
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54 (A, (B,)) and (A, (C,)) |
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55 |
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56 Format |
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57 ------ |
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58 |
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59 Markers are stored in an append-only file stored in |
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60 '.hg/store/obsstore'. |
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61 |
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62 The file starts with a version header: |
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63 |
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64 - 1 unsigned byte: version number, starting at zero. |
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65 |
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66 |
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67 The header is followed by the markers. Each marker is made of: |
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68 |
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69 - 1 unsigned byte: number of new changesets "N", can be zero. |
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70 |
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71 - 1 unsigned 32-bits integer: metadata size "M" in bytes. |
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72 |
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73 - 1 byte: a bit field. It is reserved for flags used in common |
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74 obsolete marker operations, to avoid repeated decoding of metadata |
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75 entries. |
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76 |
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77 - 20 bytes: obsoleted changeset identifier. |
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78 |
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79 - N*20 bytes: new changesets identifiers. |
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80 |
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81 - M bytes: metadata as a sequence of nul-terminated strings. Each |
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82 string contains a key and a value, separated by a colon ':', without |
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83 additional encoding. Keys cannot contain '\0' or ':' and values |
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84 cannot contain '\0'. |
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85 |
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86 """ |
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87 import struct |
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88 import util, base85, node |
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89 import phases |
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90 from i18n import _ |
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91 |
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92 _pack = struct.pack |
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93 _unpack = struct.unpack |
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94 |
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95 _SEEK_END = 2 # os.SEEK_END was introduced in Python 2.5 |
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96 |
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97 # the obsolete feature is not mature enough to be enabled by default. |
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98 # you have to rely on third party extension extension to enable this. |
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99 _enabled = False |
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100 |
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101 # data used for parsing and writing |
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102 _fmversion = 0 |
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103 _fmfixed = '>BIB20s' |
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104 _fmnode = '20s' |
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105 _fmfsize = struct.calcsize(_fmfixed) |
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106 _fnodesize = struct.calcsize(_fmnode) |
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107 |
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108 ### obsolescence marker flag |
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109 |
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110 ## bumpedfix flag |
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111 # |
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112 # When a changeset A' succeed to a changeset A which became public, we call A' |
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113 # "bumped" because it's a successors of a public changesets |
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114 # |
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115 # o A' (bumped) |
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116 # |`: |
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117 # | o A |
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118 # |/ |
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119 # o Z |
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120 # |
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121 # The way to solve this situation is to create a new changeset Ad as children |
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122 # of A. This changeset have the same content than A'. So the diff from A to A' |
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123 # is the same than the diff from A to Ad. Ad is marked as a successors of A' |
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124 # |
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125 # o Ad |
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126 # |`: |
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127 # | x A' |
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128 # |'| |
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129 # o | A |
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130 # |/ |
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131 # o Z |
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132 # |
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133 # But by transitivity Ad is also a successors of A. To avoid having Ad marked |
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134 # as bumped too, we add the `bumpedfix` flag to the marker. <A', (Ad,)>. |
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135 # This flag mean that the successors express the changes between the public and |
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136 # bumped version and fix the situation, breaking the transitivity of |
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137 # "bumped" here. |
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138 bumpedfix = 1 |
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139 |
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140 def _readmarkers(data): |
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141 """Read and enumerate markers from raw data""" |
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142 off = 0 |
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143 diskversion = _unpack('>B', data[off:off + 1])[0] |
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144 off += 1 |
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145 if diskversion != _fmversion: |
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146 raise util.Abort(_('parsing obsolete marker: unknown version %r') |
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147 % diskversion) |
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148 |
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149 # Loop on markers |
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150 l = len(data) |
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151 while off + _fmfsize <= l: |
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152 # read fixed part |
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153 cur = data[off:off + _fmfsize] |
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154 off += _fmfsize |
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155 nbsuc, mdsize, flags, pre = _unpack(_fmfixed, cur) |
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156 # read replacement |
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157 sucs = () |
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158 if nbsuc: |
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159 s = (_fnodesize * nbsuc) |
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160 cur = data[off:off + s] |
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161 sucs = _unpack(_fmnode * nbsuc, cur) |
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162 off += s |
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163 # read metadata |
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164 # (metadata will be decoded on demand) |
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165 metadata = data[off:off + mdsize] |
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166 if len(metadata) != mdsize: |
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167 raise util.Abort(_('parsing obsolete marker: metadata is too ' |
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168 'short, %d bytes expected, got %d') |
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169 % (mdsize, len(metadata))) |
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170 off += mdsize |
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171 yield (pre, sucs, flags, metadata) |
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172 |
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173 def encodemeta(meta): |
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174 """Return encoded metadata string to string mapping. |
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175 |
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176 Assume no ':' in key and no '\0' in both key and value.""" |
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177 for key, value in meta.iteritems(): |
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178 if ':' in key or '\0' in key: |
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179 raise ValueError("':' and '\0' are forbidden in metadata key'") |
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180 if '\0' in value: |
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181 raise ValueError("':' is forbidden in metadata value'") |
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182 return '\0'.join(['%s:%s' % (k, meta[k]) for k in sorted(meta)]) |
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183 |
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184 def decodemeta(data): |
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185 """Return string to string dictionary from encoded version.""" |
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186 d = {} |
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187 for l in data.split('\0'): |
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188 if l: |
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189 key, value = l.split(':') |
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190 d[key] = value |
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191 return d |
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192 |
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193 class marker(object): |
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194 """Wrap obsolete marker raw data""" |
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195 |
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196 def __init__(self, repo, data): |
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197 # the repo argument will be used to create changectx in later version |
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198 self._repo = repo |
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199 self._data = data |
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200 self._decodedmeta = None |
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201 |
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202 def __hash__(self): |
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203 return hash(self._data) |
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204 |
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205 def __eq__(self, other): |
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206 if type(other) != type(self): |
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207 return False |
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208 return self._data == other._data |
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209 |
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210 def precnode(self): |
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211 """Precursor changeset node identifier""" |
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212 return self._data[0] |
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213 |
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214 def succnodes(self): |
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215 """List of successor changesets node identifiers""" |
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216 return self._data[1] |
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217 |
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218 def metadata(self): |
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219 """Decoded metadata dictionary""" |
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220 if self._decodedmeta is None: |
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221 self._decodedmeta = decodemeta(self._data[3]) |
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222 return self._decodedmeta |
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223 |
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224 def date(self): |
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225 """Creation date as (unixtime, offset)""" |
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226 parts = self.metadata()['date'].split(' ') |
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227 return (float(parts[0]), int(parts[1])) |
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228 |
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229 class obsstore(object): |
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230 """Store obsolete markers |
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231 |
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232 Markers can be accessed with two mappings: |
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233 - precursors[x] -> set(markers on precursors edges of x) |
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234 - successors[x] -> set(markers on successors edges of x) |
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235 """ |
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236 |
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237 def __init__(self, sopener): |
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238 # caches for various obsolescence related cache |
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239 self.caches = {} |
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240 self._all = [] |
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241 # new markers to serialize |
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242 self.precursors = {} |
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243 self.successors = {} |
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244 self.sopener = sopener |
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245 data = sopener.tryread('obsstore') |
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246 if data: |
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247 self._load(_readmarkers(data)) |
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248 |
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249 def __iter__(self): |
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250 return iter(self._all) |
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251 |
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252 def __len__(self): |
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253 return len(self._all) |
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254 |
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255 def __nonzero__(self): |
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256 return bool(self._all) |
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257 |
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258 def create(self, transaction, prec, succs=(), flag=0, metadata=None): |
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259 """obsolete: add a new obsolete marker |
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260 |
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261 * ensuring it is hashable |
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262 * check mandatory metadata |
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263 * encode metadata |
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264 |
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265 If you are a human writing code creating marker you want to use the |
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266 `createmarkers` function in this module instead. |
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267 |
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268 return True if a new marker have been added, False if the markers |
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269 already existed (no op). |
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270 """ |
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271 if metadata is None: |
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272 metadata = {} |
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273 if 'date' not in metadata: |
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274 metadata['date'] = "%d %d" % util.makedate() |
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275 if len(prec) != 20: |
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276 raise ValueError(prec) |
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277 for succ in succs: |
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278 if len(succ) != 20: |
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279 raise ValueError(succ) |
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280 if prec in succs: |
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281 raise ValueError(_('in-marker cycle with %s') % node.hex(prec)) |
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282 marker = (str(prec), tuple(succs), int(flag), encodemeta(metadata)) |
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283 return bool(self.add(transaction, [marker])) |
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284 |
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285 def add(self, transaction, markers): |
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286 """Add new markers to the store |
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287 |
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288 Take care of filtering duplicate. |
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289 Return the number of new marker.""" |
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290 if not _enabled: |
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291 raise util.Abort('obsolete feature is not enabled on this repo') |
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292 known = set(self._all) |
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293 new = [] |
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294 for m in markers: |
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295 if m not in known: |
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296 known.add(m) |
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297 new.append(m) |
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298 if new: |
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299 f = self.sopener('obsstore', 'ab') |
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300 try: |
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301 # Whether the file's current position is at the begin or at |
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302 # the end after opening a file for appending is implementation |
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303 # defined. So we must seek to the end before calling tell(), |
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304 # or we may get a zero offset for non-zero sized files on |
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305 # some platforms (issue3543). |
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306 f.seek(0, _SEEK_END) |
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307 offset = f.tell() |
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308 transaction.add('obsstore', offset) |
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309 # offset == 0: new file - add the version header |
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310 for bytes in _encodemarkers(new, offset == 0): |
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311 f.write(bytes) |
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312 finally: |
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313 # XXX: f.close() == filecache invalidation == obsstore rebuilt. |
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314 # call 'filecacheentry.refresh()' here |
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315 f.close() |
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316 self._load(new) |
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317 # new marker *may* have changed several set. invalidate the cache. |
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318 self.caches.clear() |
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319 return len(new) |
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320 |
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322 markers = _readmarkers(data) |
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324 |
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325 def _load(self, markers): |
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326 for mark in markers: |
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327 self._all.append(mark) |
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328 pre, sucs = mark[:2] |
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329 self.successors.setdefault(pre, set()).add(mark) |
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330 for suc in sucs: |
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331 self.precursors.setdefault(suc, set()).add(mark) |
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332 if node.nullid in self.precursors: |
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333 raise util.Abort(_('bad obsolescence marker detected: ' |
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334 'invalid successors nullid')) |
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335 |
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336 def _encodemarkers(markers, addheader=False): |
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337 # Kept separate from flushmarkers(), it will be reused for |
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338 # markers exchange. |
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339 if addheader: |
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340 yield _pack('>B', _fmversion) |
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341 for marker in markers: |
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342 yield _encodeonemarker(marker) |
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343 |
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344 |
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345 def _encodeonemarker(marker): |
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346 pre, sucs, flags, metadata = marker |
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347 nbsuc = len(sucs) |
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348 format = _fmfixed + (_fmnode * nbsuc) |
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349 data = [nbsuc, len(metadata), flags, pre] |
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350 data.extend(sucs) |
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351 return _pack(format, *data) + metadata |
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352 |
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353 # arbitrary picked to fit into 8K limit from HTTP server |
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354 # you have to take in account: |
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355 # - the version header |
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356 # - the base85 encoding |
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357 _maxpayload = 5300 |
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358 |
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359 def _pushkeyescape(markers): |
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360 """encode markers into a dict suitable for pushkey exchange |
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361 |
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362 - binary data is base85 encoded |
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363 - split in chunks smaller than 5300 bytes""" |
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364 keys = {} |
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365 parts = [] |
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366 currentlen = _maxpayload * 2 # ensure we create a new part |
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367 for marker in markers: |
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368 nextdata = _encodeonemarker(marker) |
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369 if (len(nextdata) + currentlen > _maxpayload): |
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370 currentpart = [] |
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371 currentlen = 0 |
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372 parts.append(currentpart) |
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373 currentpart.append(nextdata) |
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374 currentlen += len(nextdata) |
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375 for idx, part in enumerate(reversed(parts)): |
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376 data = ''.join([_pack('>B', _fmversion)] + part) |
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377 keys['dump%i' % idx] = base85.b85encode(data) |
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378 return keys |
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379 |
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380 def listmarkers(repo): |
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381 """List markers over pushkey""" |
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382 if not repo.obsstore: |
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383 return {} |
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384 return _pushkeyescape(repo.obsstore) |
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385 |
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386 def pushmarker(repo, key, old, new): |
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387 """Push markers over pushkey""" |
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388 if not key.startswith('dump'): |
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389 repo.ui.warn(_('unknown key: %r') % key) |
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390 return 0 |
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391 if old: |
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392 repo.ui.warn(_('unexpected old value for %r') % key) |
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393 return 0 |
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394 data = base85.b85decode(new) |
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395 lock = repo.lock() |
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396 try: |
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397 tr = repo.transaction('pushkey: obsolete markers') |
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398 try: |
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399 repo.obsstore.mergemarkers(tr, data) |
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400 tr.close() |
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401 return 1 |
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402 finally: |
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403 tr.release() |
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404 finally: |
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405 lock.release() |
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406 |
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407 def allmarkers(repo): |
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408 """all obsolete markers known in a repository""" |
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409 for markerdata in repo.obsstore: |
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410 yield marker(repo, markerdata) |
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411 |
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412 def precursormarkers(ctx): |
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413 """obsolete marker marking this changeset as a successors""" |
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414 for data in ctx._repo.obsstore.precursors.get(ctx.node(), ()): |
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415 yield marker(ctx._repo, data) |
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416 |
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417 def successormarkers(ctx): |
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418 """obsolete marker making this changeset obsolete""" |
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419 for data in ctx._repo.obsstore.successors.get(ctx.node(), ()): |
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420 yield marker(ctx._repo, data) |
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421 |
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422 def allsuccessors(obsstore, nodes, ignoreflags=0): |
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423 """Yield node for every successor of <nodes>. |
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424 |
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425 Some successors may be unknown locally. |
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426 |
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427 This is a linear yield unsuited to detecting split changesets. It includes |
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428 initial nodes too.""" |
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429 remaining = set(nodes) |
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430 seen = set(remaining) |
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431 while remaining: |
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432 current = remaining.pop() |
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433 yield current |
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434 for mark in obsstore.successors.get(current, ()): |
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435 # ignore marker flagged with specified flag |
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436 if mark[2] & ignoreflags: |
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437 continue |
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438 for suc in mark[1]: |
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439 if suc not in seen: |
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440 seen.add(suc) |
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441 remaining.add(suc) |
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442 |
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443 def allprecursors(obsstore, nodes, ignoreflags=0): |
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444 """Yield node for every precursors of <nodes>. |
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445 |
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446 Some precursors may be unknown locally. |
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447 |
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448 This is a linear yield unsuited to detecting folded changesets. It includes |
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449 initial nodes too.""" |
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450 |
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451 remaining = set(nodes) |
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452 seen = set(remaining) |
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453 while remaining: |
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454 current = remaining.pop() |
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455 yield current |
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456 for mark in obsstore.precursors.get(current, ()): |
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457 # ignore marker flagged with specified flag |
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458 if mark[2] & ignoreflags: |
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459 continue |
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460 suc = mark[0] |
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461 if suc not in seen: |
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462 seen.add(suc) |
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463 remaining.add(suc) |
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464 |
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465 def foreground(repo, nodes): |
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466 """return all nodes in the "foreground" of other node |
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467 |
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468 The foreground of a revision is anything reachable using parent -> children |
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469 or precursor -> successor relation. It is very similar to "descendant" but |
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470 augmented with obsolescence information. |
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471 |
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472 Beware that possible obsolescence cycle may result if complex situation. |
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473 """ |
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474 repo = repo.unfiltered() |
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475 foreground = set(repo.set('%ln::', nodes)) |
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476 if repo.obsstore: |
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477 # We only need this complicated logic if there is obsolescence |
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478 # XXX will probably deserve an optimised revset. |
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479 nm = repo.changelog.nodemap |
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480 plen = -1 |
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481 # compute the whole set of successors or descendants |
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482 while len(foreground) != plen: |
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483 plen = len(foreground) |
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484 succs = set(c.node() for c in foreground) |
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485 mutable = [c.node() for c in foreground if c.mutable()] |
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486 succs.update(allsuccessors(repo.obsstore, mutable)) |
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487 known = (n for n in succs if n in nm) |
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488 foreground = set(repo.set('%ln::', known)) |
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489 return set(c.node() for c in foreground) |
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490 |
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491 |
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492 def successorssets(repo, initialnode, cache=None): |
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493 """Return all set of successors of initial nodes |
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494 |
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495 The successors set of a changeset A are a group of revisions that succeed |
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496 A. It succeeds A as a consistent whole, each revision being only a partial |
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497 replacement. The successors set contains non-obsolete changesets only. |
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498 |
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499 This function returns the full list of successor sets which is why it |
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500 returns a list of tuples and not just a single tuple. Each tuple is a valid |
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501 successors set. Not that (A,) may be a valid successors set for changeset A |
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502 (see below). |
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503 |
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504 In most cases, a changeset A will have a single element (e.g. the changeset |
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505 A is replaced by A') in its successors set. Though, it is also common for a |
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506 changeset A to have no elements in its successor set (e.g. the changeset |
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507 has been pruned). Therefore, the returned list of successors sets will be |
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508 [(A',)] or [], respectively. |
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509 |
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510 When a changeset A is split into A' and B', however, it will result in a |
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511 successors set containing more than a single element, i.e. [(A',B')]. |
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512 Divergent changesets will result in multiple successors sets, i.e. [(A',), |
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513 (A'')]. |
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514 |
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515 If a changeset A is not obsolete, then it will conceptually have no |
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516 successors set. To distinguish this from a pruned changeset, the successor |
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517 set will only contain itself, i.e. [(A,)]. |
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518 |
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519 Finally, successors unknown locally are considered to be pruned (obsoleted |
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520 without any successors). |
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521 |
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522 The optional `cache` parameter is a dictionary that may contain precomputed |
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523 successors sets. It is meant to reuse the computation of a previous call to |
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524 `successorssets` when multiple calls are made at the same time. The cache |
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525 dictionary is updated in place. The caller is responsible for its live |
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526 spawn. Code that makes multiple calls to `successorssets` *must* use this |
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527 cache mechanism or suffer terrible performances. |
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528 |
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529 """ |
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530 |
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531 succmarkers = repo.obsstore.successors |
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532 |
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533 # Stack of nodes we search successors sets for |
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534 toproceed = [initialnode] |
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535 # set version of above list for fast loop detection |
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536 # element added to "toproceed" must be added here |
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537 stackedset = set(toproceed) |
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538 if cache is None: |
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539 cache = {} |
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540 |
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541 # This while loop is the flattened version of a recursive search for |
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542 # successors sets |
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543 # |
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544 # def successorssets(x): |
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545 # successors = directsuccessors(x) |
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546 # ss = [[]] |
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547 # for succ in directsuccessors(x): |
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548 # # product as in itertools cartesian product |
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549 # ss = product(ss, successorssets(succ)) |
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550 # return ss |
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551 # |
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552 # But we can not use plain recursive calls here: |
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553 # - that would blow the python call stack |
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554 # - obsolescence markers may have cycles, we need to handle them. |
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555 # |
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556 # The `toproceed` list act as our call stack. Every node we search |
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557 # successors set for are stacked there. |
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558 # |
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559 # The `stackedset` is set version of this stack used to check if a node is |
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560 # already stacked. This check is used to detect cycles and prevent infinite |
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561 # loop. |
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562 # |
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563 # successors set of all nodes are stored in the `cache` dictionary. |
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564 # |
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565 # After this while loop ends we use the cache to return the successors sets |
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566 # for the node requested by the caller. |
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567 while toproceed: |
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568 # Every iteration tries to compute the successors sets of the topmost |
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569 # node of the stack: CURRENT. |
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570 # |
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571 # There are four possible outcomes: |
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572 # |
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573 # 1) We already know the successors sets of CURRENT: |
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574 # -> mission accomplished, pop it from the stack. |
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575 # 2) Node is not obsolete: |
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576 # -> the node is its own successors sets. Add it to the cache. |
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577 # 3) We do not know successors set of direct successors of CURRENT: |
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578 # -> We add those successors to the stack. |
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579 # 4) We know successors sets of all direct successors of CURRENT: |
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580 # -> We can compute CURRENT successors set and add it to the |
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581 # cache. |
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582 # |
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583 current = toproceed[-1] |
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584 if current in cache: |
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585 # case (1): We already know the successors sets |
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586 stackedset.remove(toproceed.pop()) |
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587 elif current not in succmarkers: |
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588 # case (2): The node is not obsolete. |
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589 if current in repo: |
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590 # We have a valid last successors. |
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591 cache[current] = [(current,)] |
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592 else: |
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593 # Final obsolete version is unknown locally. |
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594 # Do not count that as a valid successors |
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595 cache[current] = [] |
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596 else: |
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597 # cases (3) and (4) |
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598 # |
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599 # We proceed in two phases. Phase 1 aims to distinguish case (3) |
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600 # from case (4): |
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601 # |
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602 # For each direct successors of CURRENT, we check whether its |
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603 # successors sets are known. If they are not, we stack the |
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604 # unknown node and proceed to the next iteration of the while |
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605 # loop. (case 3) |
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606 # |
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607 # During this step, we may detect obsolescence cycles: a node |
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608 # with unknown successors sets but already in the call stack. |
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609 # In such a situation, we arbitrary set the successors sets of |
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610 # the node to nothing (node pruned) to break the cycle. |
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611 # |
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612 # If no break was encountered we proceed to phase 2. |
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613 # |
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614 # Phase 2 computes successors sets of CURRENT (case 4); see details |
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615 # in phase 2 itself. |
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616 # |
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617 # Note the two levels of iteration in each phase. |
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618 # - The first one handles obsolescence markers using CURRENT as |
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619 # precursor (successors markers of CURRENT). |
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620 # |
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621 # Having multiple entry here means divergence. |
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622 # |
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623 # - The second one handles successors defined in each marker. |
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624 # |
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625 # Having none means pruned node, multiple successors means split, |
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626 # single successors are standard replacement. |
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627 # |
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628 for mark in sorted(succmarkers[current]): |
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629 for suc in mark[1]: |
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630 if suc not in cache: |
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631 if suc in stackedset: |
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632 # cycle breaking |
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633 cache[suc] = [] |
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634 else: |
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635 # case (3) If we have not computed successors sets |
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636 # of one of those successors we add it to the |
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637 # `toproceed` stack and stop all work for this |
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638 # iteration. |
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639 toproceed.append(suc) |
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640 stackedset.add(suc) |
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641 break |
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642 else: |
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643 continue |
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644 break |
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645 else: |
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646 # case (4): we know all successors sets of all direct |
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647 # successors |
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648 # |
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649 # Successors set contributed by each marker depends on the |
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650 # successors sets of all its "successors" node. |
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651 # |
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652 # Each different marker is a divergence in the obsolescence |
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653 # history. It contributes successors sets distinct from other |
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654 # markers. |
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655 # |
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656 # Within a marker, a successor may have divergent successors |
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657 # sets. In such a case, the marker will contribute multiple |
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658 # divergent successors sets. If multiple successors have |
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659 # divergent successors sets, a Cartesian product is used. |
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660 # |
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661 # At the end we post-process successors sets to remove |
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662 # duplicated entry and successors set that are strict subset of |
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663 # another one. |
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664 succssets = [] |
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665 for mark in sorted(succmarkers[current]): |
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666 # successors sets contributed by this marker |
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667 markss = [[]] |
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668 for suc in mark[1]: |
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669 # cardinal product with previous successors |
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670 productresult = [] |
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671 for prefix in markss: |
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672 for suffix in cache[suc]: |
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673 newss = list(prefix) |
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674 for part in suffix: |
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675 # do not duplicated entry in successors set |
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676 # first entry wins. |
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677 if part not in newss: |
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678 newss.append(part) |
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679 productresult.append(newss) |
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680 markss = productresult |
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681 succssets.extend(markss) |
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682 # remove duplicated and subset |
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683 seen = [] |
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684 final = [] |
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685 candidate = sorted(((set(s), s) for s in succssets if s), |
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686 key=lambda x: len(x[1]), reverse=True) |
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687 for setversion, listversion in candidate: |
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688 for seenset in seen: |
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689 if setversion.issubset(seenset): |
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690 break |
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691 else: |
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692 final.append(listversion) |
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693 seen.append(setversion) |
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694 final.reverse() # put small successors set first |
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695 cache[current] = final |
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696 return cache[initialnode] |
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|
697 |
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698 def _knownrevs(repo, nodes): |
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699 """yield revision numbers of known nodes passed in parameters |
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700 |
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701 Unknown revisions are silently ignored.""" |
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702 torev = repo.changelog.nodemap.get |
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|
703 for n in nodes: |
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|
704 rev = torev(n) |
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705 if rev is not None: |
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706 yield rev |
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707 |
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708 # mapping of 'set-name' -> <function to compute this set> |
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709 cachefuncs = {} |
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710 def cachefor(name): |
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711 """Decorator to register a function as computing the cache for a set""" |
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712 def decorator(func): |
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713 assert name not in cachefuncs |
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714 cachefuncs[name] = func |
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715 return func |
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716 return decorator |
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|
717 |
17825
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|
718 def getrevs(repo, name): |
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719 """Return the set of revision that belong to the <name> set |
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|
720 |
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721 Such access may compute the set and cache it for future use""" |
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|
722 repo = repo.unfiltered() |
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|
723 if not repo.obsstore: |
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724 return () |
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725 if name not in repo.obsstore.caches: |
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726 repo.obsstore.caches[name] = cachefuncs[name](repo) |
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727 return repo.obsstore.caches[name] |
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728 |
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|
729 # To be simple we need to invalidate obsolescence cache when: |
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730 # |
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731 # - new changeset is added: |
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732 # - public phase is changed |
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733 # - obsolescence marker are added |
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734 # - strip is used a repo |
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|
735 def clearobscaches(repo): |
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|
736 """Remove all obsolescence related cache from a repo |
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|
737 |
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|
738 This remove all cache in obsstore is the obsstore already exist on the |
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739 repo. |
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740 |
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|
741 (We could be smarter here given the exact event that trigger the cache |
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|
742 clearing)""" |
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|
743 # only clear cache is there is obsstore data in this repo |
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|
744 if 'obsstore' in repo._filecache: |
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|
745 repo.obsstore.caches.clear() |
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|
746 |
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|
747 @cachefor('obsolete') |
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|
748 def _computeobsoleteset(repo): |
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|
749 """the set of obsolete revisions""" |
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|
750 obs = set() |
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|
751 getrev = repo.changelog.nodemap.get |
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|
752 getphase = repo._phasecache.phase |
17776
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diff
changeset
|
753 for node in repo.obsstore.successors: |
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|
754 rev = getrev(node) |
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|
755 if rev is not None and getphase(repo, rev): |
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|
756 obs.add(rev) |
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|
757 return obs |
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|
758 |
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|
759 @cachefor('unstable') |
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|
760 def _computeunstableset(repo): |
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761 """the set of non obsolete revisions with obsolete parents""" |
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|
762 # revset is not efficient enough here |
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|
763 # we do (obsolete()::) - obsolete() by hand |
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|
764 obs = getrevs(repo, 'obsolete') |
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|
765 if not obs: |
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|
766 return set() |
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|
767 cl = repo.changelog |
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|
768 return set(r for r in cl.descendants(obs) if r not in obs) |
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769 |
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|
770 @cachefor('suspended') |
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|
771 def _computesuspendedset(repo): |
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|
772 """the set of obsolete parents with non obsolete descendants""" |
18276
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|
773 suspended = repo.changelog.ancestors(getrevs(repo, 'unstable')) |
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|
774 return set(r for r in getrevs(repo, 'obsolete') if r in suspended) |
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775 |
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|
776 @cachefor('extinct') |
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|
777 def _computeextinctset(repo): |
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778 """the set of obsolete parents without non obsolete descendants""" |
18277
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changeset
|
779 return getrevs(repo, 'obsolete') - getrevs(repo, 'suspended') |
17474
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|
780 |
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|
781 |
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|
782 @cachefor('bumped') |
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|
783 def _computebumpedset(repo): |
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changeset
|
784 """the set of revs trying to obsolete public revisions""" |
20207
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diff
changeset
|
785 bumped = set() |
21024
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786 # util function (avoid attribute lookup in the loop) |
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787 phase = repo._phasecache.phase # would be faster to grab the full list |
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788 public = phases.public |
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789 cl = repo.changelog |
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790 torev = cl.nodemap.get |
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791 obs = getrevs(repo, 'obsolete') |
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792 for rev in repo: |
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793 # We only evaluate mutable, non-obsolete revision |
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794 if (public < phase(repo, rev)) and (rev not in obs): |
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795 node = cl.node(rev) |
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796 # (future) A cache of precursors may worth if split is very common |
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797 for pnode in allprecursors(repo.obsstore, [node], |
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798 ignoreflags=bumpedfix): |
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799 prev = torev(pnode) # unfiltered! but so is phasecache |
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800 if (prev is not None) and (phase(repo, prev) <= public): |
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801 # we have a public precursors |
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802 bumped.add(rev) |
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803 break # Next draft! |
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804 return bumped |
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805 |
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806 @cachefor('divergent') |
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807 def _computedivergentset(repo): |
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808 """the set of rev that compete to be the final successors of some revision. |
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809 """ |
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810 divergent = set() |
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811 obsstore = repo.obsstore |
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812 newermap = {} |
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813 for ctx in repo.set('(not public()) - obsolete()'): |
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814 mark = obsstore.precursors.get(ctx.node(), ()) |
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815 toprocess = set(mark) |
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816 while toprocess: |
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817 prec = toprocess.pop()[0] |
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818 if prec not in newermap: |
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819 successorssets(repo, prec, newermap) |
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820 newer = [n for n in newermap[prec] if n] |
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821 if len(newer) > 1: |
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822 divergent.add(ctx.rev()) |
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823 break |
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824 toprocess.update(obsstore.precursors.get(prec, ())) |
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825 return divergent |
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826 |
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827 |
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828 def createmarkers(repo, relations, flag=0, metadata=None): |
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829 """Add obsolete markers between changesets in a repo |
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830 |
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831 <relations> must be an iterable of (<old>, (<new>, ...)[,{metadata}]) |
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832 tuple. `old` and `news` are changectx. metadata is an optional dictionary |
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833 containing metadata for this marker only. It is merged with the global |
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834 metadata specified through the `metadata` argument of this function, |
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835 |
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836 Trying to obsolete a public changeset will raise an exception. |
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837 |
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838 Current user and date are used except if specified otherwise in the |
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839 metadata attribute. |
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840 |
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841 This function operates within a transaction of its own, but does |
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842 not take any lock on the repo. |
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843 """ |
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844 # prepare metadata |
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845 if metadata is None: |
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846 metadata = {} |
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847 if 'date' not in metadata: |
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848 metadata['date'] = '%i %i' % util.makedate() |
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849 if 'user' not in metadata: |
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850 metadata['user'] = repo.ui.username() |
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851 tr = repo.transaction('add-obsolescence-marker') |
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852 try: |
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853 for rel in relations: |
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854 prec = rel[0] |
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855 sucs = rel[1] |
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856 localmetadata = metadata.copy() |
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857 if 2 < len(rel): |
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858 localmetadata.update(rel[2]) |
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859 |
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860 if not prec.mutable(): |
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861 raise util.Abort("cannot obsolete immutable changeset: %s" |
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862 % prec) |
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863 nprec = prec.node() |
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864 nsucs = tuple(s.node() for s in sucs) |
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865 if nprec in nsucs: |
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866 raise util.Abort("changeset %s cannot obsolete itself" % prec) |
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867 repo.obsstore.create(tr, nprec, nsucs, flag, localmetadata) |
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868 repo.filteredrevcache.clear() |
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869 tr.close() |
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870 finally: |
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871 tr.release() |