Mercurial > hg
annotate mercurial/branchmap.py @ 21825:3666331164bb stable
cmdutil: add copy-filtering support to duplicatecopies
In order to fix issue 4192 we need to be able to skip some copies
while doing duplicatecopies.
author | Augie Fackler <raf@durin42.com> |
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date | Sat, 07 Jun 2014 15:14:36 -0400 |
parents | 05cfcecb3aef |
children | c20843aee8a4 |
rev | line source |
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1 # branchmap.py - logic to computes, maintain and stores branchmap for local repo |
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2 # |
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3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from node import bin, hex, nullid, nullrev |
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9 import encoding |
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10 import util |
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11 import time |
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12 |
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13 def _filename(repo): |
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14 """name of a branchcache file for a given repo or repoview""" |
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15 filename = "cache/branch2" |
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16 if repo.filtername: |
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17 filename = '%s-%s' % (filename, repo.filtername) |
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18 return filename |
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19 |
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20 def read(repo): |
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21 try: |
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22 f = repo.opener(_filename(repo)) |
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23 lines = f.read().split('\n') |
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24 f.close() |
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25 except (IOError, OSError): |
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26 return None |
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27 |
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28 try: |
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29 cachekey = lines.pop(0).split(" ", 2) |
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30 last, lrev = cachekey[:2] |
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31 last, lrev = bin(last), int(lrev) |
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32 filteredhash = None |
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33 if len(cachekey) > 2: |
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34 filteredhash = bin(cachekey[2]) |
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35 partial = branchcache(tipnode=last, tiprev=lrev, |
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36 filteredhash=filteredhash) |
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37 if not partial.validfor(repo): |
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38 # invalidate the cache |
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39 raise ValueError('tip differs') |
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40 for l in lines: |
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41 if not l: |
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42 continue |
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43 node, state, label = l.split(" ", 2) |
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44 if state not in 'oc': |
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45 raise ValueError('invalid branch state') |
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46 label = encoding.tolocal(label.strip()) |
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47 if not node in repo: |
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48 raise ValueError('node %s does not exist' % node) |
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49 node = bin(node) |
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50 partial.setdefault(label, []).append(node) |
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51 if state == 'c': |
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52 partial._closednodes.add(node) |
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53 except KeyboardInterrupt: |
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54 raise |
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55 except Exception, inst: |
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56 if repo.ui.debugflag: |
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57 msg = 'invalid branchheads cache' |
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58 if repo.filtername is not None: |
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59 msg += ' (%s)' % repo.filtername |
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60 msg += ': %s\n' |
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61 repo.ui.warn(msg % inst) |
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62 partial = None |
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63 return partial |
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64 |
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65 |
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66 |
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67 ### Nearest subset relation |
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68 # Nearest subset of filter X is a filter Y so that: |
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69 # * Y is included in X, |
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70 # * X - Y is as small as possible. |
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71 # This create and ordering used for branchmap purpose. |
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72 # the ordering may be partial |
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73 subsettable = {None: 'visible', |
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74 'visible': 'served', |
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75 'served': 'immutable', |
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76 'immutable': 'base'} |
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77 |
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78 def updatecache(repo): |
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79 cl = repo.changelog |
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80 filtername = repo.filtername |
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81 partial = repo._branchcaches.get(filtername) |
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82 |
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83 revs = [] |
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84 if partial is None or not partial.validfor(repo): |
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85 partial = read(repo) |
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86 if partial is None: |
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87 subsetname = subsettable.get(filtername) |
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88 if subsetname is None: |
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89 partial = branchcache() |
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90 else: |
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91 subset = repo.filtered(subsetname) |
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92 partial = subset.branchmap().copy() |
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93 extrarevs = subset.changelog.filteredrevs - cl.filteredrevs |
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94 revs.extend(r for r in extrarevs if r <= partial.tiprev) |
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95 revs.extend(cl.revs(start=partial.tiprev + 1)) |
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96 if revs: |
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97 partial.update(repo, revs) |
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98 partial.write(repo) |
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99 assert partial.validfor(repo), filtername |
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100 repo._branchcaches[repo.filtername] = partial |
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101 |
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102 class branchcache(dict): |
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103 """A dict like object that hold branches heads cache. |
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104 |
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105 This cache is used to avoid costly computations to determine all the |
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106 branch heads of a repo. |
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107 |
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108 The cache is serialized on disk in the following format: |
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109 |
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110 <tip hex node> <tip rev number> [optional filtered repo hex hash] |
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111 <branch head hex node> <open/closed state> <branch name> |
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112 <branch head hex node> <open/closed state> <branch name> |
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113 ... |
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114 |
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115 The first line is used to check if the cache is still valid. If the |
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116 branch cache is for a filtered repo view, an optional third hash is |
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117 included that hashes the hashes of all filtered revisions. |
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118 |
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119 The open/closed state is represented by a single letter 'o' or 'c'. |
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120 This field can be used to avoid changelog reads when determining if a |
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121 branch head closes a branch or not. |
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122 """ |
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123 |
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124 def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev, |
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125 filteredhash=None, closednodes=None): |
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126 super(branchcache, self).__init__(entries) |
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127 self.tipnode = tipnode |
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128 self.tiprev = tiprev |
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129 self.filteredhash = filteredhash |
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130 # closednodes is a set of nodes that close their branch. If the branch |
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131 # cache has been updated, it may contain nodes that are no longer |
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132 # heads. |
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133 if closednodes is None: |
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134 self._closednodes = set() |
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135 else: |
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136 self._closednodes = closednodes |
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137 |
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138 def _hashfiltered(self, repo): |
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139 """build hash of revision filtered in the current cache |
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140 |
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141 Tracking tipnode and tiprev is not enough to ensure validity of the |
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142 cache as they do not help to distinct cache that ignored various |
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143 revision bellow tiprev. |
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144 |
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145 To detect such difference, we build a cache of all ignored revisions. |
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146 """ |
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147 cl = repo.changelog |
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148 if not cl.filteredrevs: |
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149 return None |
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150 key = None |
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151 revs = sorted(r for r in cl.filteredrevs if r <= self.tiprev) |
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152 if revs: |
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153 s = util.sha1() |
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154 for rev in revs: |
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155 s.update('%s;' % rev) |
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156 key = s.digest() |
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157 return key |
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158 |
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159 def validfor(self, repo): |
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160 """Is the cache content valid regarding a repo |
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161 |
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162 - False when cached tipnode is unknown or if we detect a strip. |
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163 - True when cache is up to date or a subset of current repo.""" |
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164 try: |
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165 return ((self.tipnode == repo.changelog.node(self.tiprev)) |
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166 and (self.filteredhash == self._hashfiltered(repo))) |
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167 except IndexError: |
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168 return False |
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169 |
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170 def _branchtip(self, heads): |
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171 '''Return tuple with last open head in heads and false, |
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172 otherwise return last closed head and true.''' |
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173 tip = heads[-1] |
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174 closed = True |
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175 for h in reversed(heads): |
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176 if h not in self._closednodes: |
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177 tip = h |
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178 closed = False |
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179 break |
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180 return tip, closed |
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181 |
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182 def branchtip(self, branch): |
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183 '''Return the tipmost open head on branch head, otherwise return the |
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184 tipmost closed head on branch. |
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185 Raise KeyError for unknown branch.''' |
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186 return self._branchtip(self[branch])[0] |
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187 |
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188 def branchheads(self, branch, closed=False): |
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189 heads = self[branch] |
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190 if not closed: |
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191 heads = [h for h in heads if h not in self._closednodes] |
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192 return heads |
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193 |
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194 def iterbranches(self): |
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195 for bn, heads in self.iteritems(): |
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196 yield (bn, heads) + self._branchtip(heads) |
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197 |
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198 def copy(self): |
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199 """return an deep copy of the branchcache object""" |
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200 return branchcache(self, self.tipnode, self.tiprev, self.filteredhash, |
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201 self._closednodes) |
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202 |
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203 def write(self, repo): |
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204 try: |
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205 f = repo.opener(_filename(repo), "w", atomictemp=True) |
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206 cachekey = [hex(self.tipnode), str(self.tiprev)] |
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207 if self.filteredhash is not None: |
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208 cachekey.append(hex(self.filteredhash)) |
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209 f.write(" ".join(cachekey) + '\n') |
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210 nodecount = 0 |
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211 for label, nodes in sorted(self.iteritems()): |
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212 for node in nodes: |
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213 nodecount += 1 |
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214 if node in self._closednodes: |
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215 state = 'c' |
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216 else: |
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217 state = 'o' |
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218 f.write("%s %s %s\n" % (hex(node), state, |
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219 encoding.fromlocal(label))) |
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220 f.close() |
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221 repo.ui.log('branchcache', |
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222 'wrote %s branch cache with %d labels and %d nodes\n', |
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223 repo.filtername, len(self), nodecount) |
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224 except (IOError, OSError, util.Abort): |
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225 # Abort may be raise by read only opener |
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226 pass |
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227 |
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228 def update(self, repo, revgen): |
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229 """Given a branchhead cache, self, that may have extra nodes or be |
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230 missing heads, and a generator of nodes that are strictly a superset of |
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231 heads missing, this function updates self to be correct. |
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232 """ |
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233 starttime = time.time() |
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234 cl = repo.changelog |
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235 # collect new branch entries |
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236 newbranches = {} |
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237 getbranchinfo = cl.branchinfo |
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238 for r in revgen: |
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239 branch, closesbranch = getbranchinfo(r) |
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240 newbranches.setdefault(branch, []).append(r) |
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241 if closesbranch: |
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242 self._closednodes.add(cl.node(r)) |
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243 # if older branchheads are reachable from new ones, they aren't |
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244 # really branchheads. Note checking parents is insufficient: |
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245 # 1 (branch a) -> 2 (branch b) -> 3 (branch a) |
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246 for branch, newheadrevs in newbranches.iteritems(): |
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247 bheads = self.setdefault(branch, []) |
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248 bheadset = set(cl.rev(node) for node in bheads) |
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249 |
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250 # This have been tested True on all internal usage of this function. |
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251 # run it again in case of doubt |
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252 # assert not (set(bheadrevs) & set(newheadrevs)) |
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253 newheadrevs.sort() |
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254 bheadset.update(newheadrevs) |
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255 |
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256 # This loop prunes out two kinds of heads - heads that are |
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257 # superseded by a head in newheadrevs, and newheadrevs that are not |
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258 # heads because an existing head is their descendant. |
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259 while newheadrevs: |
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260 latest = newheadrevs.pop() |
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261 if latest not in bheadset: |
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262 continue |
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263 ancestors = set(cl.ancestors([latest], min(bheadset))) |
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264 bheadset -= ancestors |
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265 bheadrevs = sorted(bheadset) |
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266 self[branch] = [cl.node(rev) for rev in bheadrevs] |
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267 tiprev = bheadrevs[-1] |
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268 if tiprev > self.tiprev: |
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269 self.tipnode = cl.node(tiprev) |
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270 self.tiprev = tiprev |
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271 |
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272 if not self.validfor(repo): |
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273 # cache key are not valid anymore |
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274 self.tipnode = nullid |
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275 self.tiprev = nullrev |
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276 for heads in self.values(): |
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277 tiprev = max(cl.rev(node) for node in heads) |
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278 if tiprev > self.tiprev: |
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279 self.tipnode = cl.node(tiprev) |
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280 self.tiprev = tiprev |
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281 self.filteredhash = self._hashfiltered(repo) |
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282 |
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283 duration = time.time() - starttime |
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284 repo.ui.log('branchcache', 'updated %s branch cache in %.4f seconds\n', |
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285 repo.filtername, duration) |