Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/obsolete.py @ 17429:72fa4ef2245f

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
declare local constants instead of using magic values and comments
author Mads Kiilerich <mads@kiilerich.com>
date Mon, 27 Aug 2012 23:16:22 +0200
parents 9724f8f8850b
children fb72eec7efd8
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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
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24 Format
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25 ------
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26
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27 Markers are stored in an append-only file stored in
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28 '.hg/store/obsstore'.
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29
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30 The file starts with a version header:
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31
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32 - 1 unsigned byte: version number, starting at zero.
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33
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34
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35 The header is followed by the markers. Each marker is made of:
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36
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37 - 1 unsigned byte: number of new changesets "R", could be zero.
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38
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39 - 1 unsigned 32-bits integer: metadata size "M" in bytes.
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40
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41 - 1 byte: a bit field. It is reserved for flags used in obsolete
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42 markers common operations, to avoid repeated decoding of metadata
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43 entries.
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44
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45 - 20 bytes: obsoleted changeset identifier.
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46
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47 - N*20 bytes: new changesets identifiers.
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48
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49 - M bytes: metadata as a sequence of nul-terminated strings. Each
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50 string contains a key and a value, separated by a color ':', without
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51 additional encoding. Keys cannot contain '\0' or ':' and values
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52 cannot contain '\0'.
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53 """
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54 import struct
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55 import util, base85
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56 from i18n import _
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57
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58 _pack = struct.pack
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59 _unpack = struct.unpack
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60
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61 _SEEK_END = 2 # os.SEEK_END was introduced in Python 2.5
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62
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63 # the obsolete feature is not mature enough to be enabled by default.
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64 # you have to rely on third party extension extension to enable this.
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65 _enabled = False
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66
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67 # data used for parsing and writing
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68 _fmversion = 0
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69 _fmfixed = '>BIB20s'
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70 _fmnode = '20s'
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71 _fmfsize = struct.calcsize(_fmfixed)
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72 _fnodesize = struct.calcsize(_fmnode)
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73
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74 def _readmarkers(data):
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75 """Read and enumerate markers from raw data"""
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76 off = 0
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77 diskversion = _unpack('>B', data[off:off + 1])[0]
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78 off += 1
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79 if diskversion != _fmversion:
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80 raise util.Abort(_('parsing obsolete marker: unknown version %r')
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81 % diskversion)
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82
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83 # Loop on markers
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84 l = len(data)
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85 while off + _fmfsize <= l:
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86 # read fixed part
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87 cur = data[off:off + _fmfsize]
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88 off += _fmfsize
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89 nbsuc, mdsize, flags, pre = _unpack(_fmfixed, cur)
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90 # read replacement
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91 sucs = ()
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92 if nbsuc:
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93 s = (_fnodesize * nbsuc)
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94 cur = data[off:off + s]
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95 sucs = _unpack(_fmnode * nbsuc, cur)
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96 off += s
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97 # read metadata
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98 # (metadata will be decoded on demand)
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99 metadata = data[off:off + mdsize]
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100 if len(metadata) != mdsize:
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101 raise util.Abort(_('parsing obsolete marker: metadata is too '
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102 'short, %d bytes expected, got %d')
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103 % (mdsize, len(metadata)))
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104 off += mdsize
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105 yield (pre, sucs, flags, metadata)
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106
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107 def encodemeta(meta):
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108 """Return encoded metadata string to string mapping.
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109
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110 Assume no ':' in key and no '\0' in both key and value."""
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111 for key, value in meta.iteritems():
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112 if ':' in key or '\0' in key:
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113 raise ValueError("':' and '\0' are forbidden in metadata key'")
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114 if '\0' in value:
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115 raise ValueError("':' are forbidden in metadata value'")
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116 return '\0'.join(['%s:%s' % (k, meta[k]) for k in sorted(meta)])
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117
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118 def decodemeta(data):
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119 """Return string to string dictionary from encoded version."""
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120 d = {}
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121 for l in data.split('\0'):
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122 if l:
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123 key, value = l.split(':')
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124 d[key] = value
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125 return d
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126
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127 class marker(object):
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128 """Wrap obsolete marker raw data"""
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129
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130 def __init__(self, repo, data):
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131 # the repo argument will be used to create changectx in later version
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132 self._repo = repo
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133 self._data = data
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134 self._decodedmeta = None
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135
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136 def precnode(self):
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137 """Precursor changeset node identifier"""
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138 return self._data[0]
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139
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140 def succnodes(self):
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141 """List of successor changesets node identifiers"""
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142 return self._data[1]
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143
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144 def metadata(self):
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145 """Decoded metadata dictionary"""
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146 if self._decodedmeta is None:
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147 self._decodedmeta = decodemeta(self._data[3])
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148 return self._decodedmeta
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149
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150 def date(self):
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151 """Creation date as (unixtime, offset)"""
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152 parts = self.metadata()['date'].split(' ')
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153 return (float(parts[0]), int(parts[1]))
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154
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155 class obsstore(object):
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156 """Store obsolete markers
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157
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diff changeset
158 Markers can be accessed with two mappings:
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159 - precursors: old -> set(new)
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160 - successors: new -> set(old)
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161 """
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162
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diff changeset
163 def __init__(self, sopener):
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164 self._all = []
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165 # new markers to serialize
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166 self.precursors = {}
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167 self.successors = {}
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168 self.sopener = sopener
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diff changeset
169 data = sopener.tryread('obsstore')
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diff changeset
170 if data:
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diff changeset
171 self._load(_readmarkers(data))
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172
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diff changeset
173 def __iter__(self):
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diff changeset
174 return iter(self._all)
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175
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diff changeset
176 def __nonzero__(self):
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diff changeset
177 return bool(self._all)
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178
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179 def create(self, transaction, prec, succs=(), flag=0, metadata=None):
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180 """obsolete: add a new obsolete marker
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181
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182 * ensuring it is hashable
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183 * check mandatory metadata
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184 * encode metadata
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185 """
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186 if metadata is None:
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187 metadata = {}
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188 if len(prec) != 20:
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189 raise ValueError(prec)
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190 for succ in succs:
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191 if len(succ) != 20:
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192 raise ValueError(succ)
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193 marker = (str(prec), tuple(succs), int(flag), encodemeta(metadata))
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diff changeset
194 self.add(transaction, [marker])
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195
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196 def add(self, transaction, markers):
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197 """Add new markers to the store
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198
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199 Take care of filtering duplicate.
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200 Return the number of new marker."""
17296
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diff changeset
201 if not _enabled:
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202 raise util.Abort('obsolete feature is not enabled on this repo')
17220
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203 new = [m for m in markers if m not in self._all]
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204 if new:
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diff changeset
205 f = self.sopener('obsstore', 'ab')
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diff changeset
206 try:
17195
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Adrian Buehlmann <adrian@cadifra.com>
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diff changeset
207 # Whether the file's current position is at the begin or at
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208 # the end after opening a file for appending is implementation
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diff changeset
209 # defined. So we must seek to the end before calling tell(),
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210 # or we may get a zero offset for non-zero sized files on
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diff changeset
211 # some platforms (issue3543).
17429
72fa4ef2245f declare local constants instead of using magic values and comments
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parents: 17426
diff changeset
212 f.seek(0, _SEEK_END)
17126
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diff changeset
213 offset = f.tell()
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diff changeset
214 transaction.add('obsstore', offset)
17219
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diff changeset
215 # offset == 0: new file - add the version header
17220
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diff changeset
216 for bytes in _encodemarkers(new, offset == 0):
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diff changeset
217 f.write(bytes)
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diff changeset
218 finally:
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diff changeset
219 # XXX: f.close() == filecache invalidation == obsstore rebuilt.
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diff changeset
220 # call 'filecacheentry.refresh()' here
17124
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diff changeset
221 f.close()
17220
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diff changeset
222 self._load(new)
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223 return len(new)
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diff changeset
224
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diff changeset
225 def mergemarkers(self, transation, data):
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diff changeset
226 markers = _readmarkers(data)
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diff changeset
227 self.add(transation, markers)
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228
17220
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diff changeset
229 def _load(self, markers):
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diff changeset
230 for mark in markers:
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diff changeset
231 self._all.append(mark)
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diff changeset
232 pre, sucs = mark[:2]
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diff changeset
233 self.precursors.setdefault(pre, set()).add(mark)
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diff changeset
234 for suc in sucs:
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diff changeset
235 self.successors.setdefault(suc, set()).add(mark)
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236
17219
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diff changeset
237 def _encodemarkers(markers, addheader=False):
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diff changeset
238 # Kept separate from flushmarkers(), it will be reused for
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diff changeset
239 # markers exchange.
17219
494a970f68de obsolete: refactor writemarkers to only encode them
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diff changeset
240 if addheader:
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diff changeset
241 yield _pack('>B', _fmversion)
17125
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diff changeset
242 for marker in markers:
17295
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diff changeset
243 yield _encodeonemarker(marker)
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diff changeset
244
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diff changeset
245
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diff changeset
246 def _encodeonemarker(marker):
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diff changeset
247 pre, sucs, flags, metadata = marker
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parents: 17253
diff changeset
248 nbsuc = len(sucs)
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parents: 17253
diff changeset
249 format = _fmfixed + (_fmnode * nbsuc)
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diff changeset
250 data = [nbsuc, len(metadata), flags, pre]
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parents: 17253
diff changeset
251 data.extend(sucs)
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parents: 17253
diff changeset
252 return _pack(format, *data) + metadata
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parents: 17253
diff changeset
253
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parents: 17253
diff changeset
254 # arbitrary picked to fit into 8K limit from HTTP server
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diff changeset
255 # you have to take in account:
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diff changeset
256 # - the version header
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Pierre-Yves David <pierre-yves.david@logilab.fr>
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diff changeset
257 # - the base85 encoding
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Pierre-Yves David <pierre-yves.david@logilab.fr>
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diff changeset
258 _maxpayload = 5300
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diff changeset
259
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diff changeset
260 def listmarkers(repo):
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diff changeset
261 """List markers over pushkey"""
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diff changeset
262 if not repo.obsstore:
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diff changeset
263 return {}
17295
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parents: 17253
diff changeset
264 keys = {}
1f08ecc7febb pushkey: splits obsolete marker exchange into multiple keys
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parents: 17253
diff changeset
265 parts = []
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parents: 17253
diff changeset
266 currentlen = _maxpayload * 2 # ensure we create a new part
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parents: 17253
diff changeset
267 for marker in repo.obsstore:
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parents: 17253
diff changeset
268 nextdata = _encodeonemarker(marker)
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parents: 17253
diff changeset
269 if (len(nextdata) + currentlen > _maxpayload):
1f08ecc7febb pushkey: splits obsolete marker exchange into multiple keys
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parents: 17253
diff changeset
270 currentpart = []
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parents: 17253
diff changeset
271 currentlen = 0
1f08ecc7febb pushkey: splits obsolete marker exchange into multiple keys
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parents: 17253
diff changeset
272 parts.append(currentpart)
1f08ecc7febb pushkey: splits obsolete marker exchange into multiple keys
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parents: 17253
diff changeset
273 currentpart.append(nextdata)
17304
0368fc55d572 obsolete: properly increment currentlen when building pushkey payload
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17298
diff changeset
274 currentlen += len(nextdata)
17295
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parents: 17253
diff changeset
275 for idx, part in enumerate(reversed(parts)):
1f08ecc7febb pushkey: splits obsolete marker exchange into multiple keys
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17253
diff changeset
276 data = ''.join([_pack('>B', _fmversion)] + part)
1f08ecc7febb pushkey: splits obsolete marker exchange into multiple keys
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17253
diff changeset
277 keys['dump%i' % idx] = base85.b85encode(data)
1f08ecc7febb pushkey: splits obsolete marker exchange into multiple keys
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parents: 17253
diff changeset
278 return keys
17073
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parents: 17072
diff changeset
279
17075
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diff changeset
280 def pushmarker(repo, key, old, new):
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diff changeset
281 """Push markers over pushkey"""
17295
1f08ecc7febb pushkey: splits obsolete marker exchange into multiple keys
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parents: 17253
diff changeset
282 if not key.startswith('dump'):
17075
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parents: 17073
diff changeset
283 repo.ui.warn(_('unknown key: %r') % key)
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parents: 17073
diff changeset
284 return 0
28ed1c4511ce obsolete: exchange obsolete marker over pushkey
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parents: 17073
diff changeset
285 if old:
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diff changeset
286 repo.ui.warn(_('unexpected old value') % key)
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diff changeset
287 return 0
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diff changeset
288 data = base85.b85decode(new)
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diff changeset
289 lock = repo.lock()
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diff changeset
290 try:
17126
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parents: 17125
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291 tr = repo.transaction('pushkey: obsolete markers')
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parents: 17125
diff changeset
292 try:
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parents: 17125
diff changeset
293 repo.obsstore.mergemarkers(tr, data)
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diff changeset
294 tr.close()
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 17125
diff changeset
295 return 1
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parents: 17125
diff changeset
296 finally:
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parents: 17125
diff changeset
297 tr.release()
17075
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parents: 17073
diff changeset
298 finally:
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parents: 17073
diff changeset
299 lock.release()
17073
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parents: 17072
diff changeset
300
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diff changeset
301 def allmarkers(repo):
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302 """all obsolete markers known in a repository"""
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parents: 17072
diff changeset
303 for markerdata in repo.obsstore:
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parents: 17072
diff changeset
304 yield marker(repo, markerdata)
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parents: 17072
diff changeset
305
17076
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diff changeset
306 def precursormarkers(ctx):
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diff changeset
307 """obsolete marker making this changeset obsolete"""
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parents: 17075
diff changeset
308 for data in ctx._repo.obsstore.precursors.get(ctx.node(), ()):
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parents: 17075
diff changeset
309 yield marker(ctx._repo, data)
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parents: 17075
diff changeset
310
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parents: 17075
diff changeset
311 def successormarkers(ctx):
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parents: 17075
diff changeset
312 """obsolete marker marking this changeset as a successors"""
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parents: 17075
diff changeset
313 for data in ctx._repo.obsstore.successors.get(ctx.node(), ()):
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parents: 17075
diff changeset
314 yield marker(ctx._repo, data)
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parents: 17075
diff changeset
315
17213
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Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
316 def anysuccessors(obsstore, node):
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parents: 17200
diff changeset
317 """Yield every successor of <node>
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parents: 17200
diff changeset
318
17425
e95ec38f86b0 fix wording and not-completely-trivial spelling errors and bad docstrings
Mads Kiilerich <mads@kiilerich.com>
parents: 17424
diff changeset
319 This is a linear yield unsuitable to detect split changesets."""
17213
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parents: 17200
diff changeset
320 remaining = set([node])
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parents: 17200
diff changeset
321 seen = set(remaining)
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parents: 17200
diff changeset
322 while remaining:
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parents: 17200
diff changeset
323 current = remaining.pop()
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Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
324 yield current
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parents: 17200
diff changeset
325 for mark in obsstore.precursors.get(current, ()):
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Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
326 for suc in mark[1]:
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Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
327 if suc not in seen:
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Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
328 seen.add(suc)
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parents: 17200
diff changeset
329 remaining.add(suc)