Mercurial > hg
annotate mercurial/branchmap.py @ 20629:277dc5f27310
cmdserver: recreate mq object on runcommand in case queue path was changed
repo.mq needs to be recreated after queue path change. Since there is little
benefit to keep invalidated mq object, it always delete repo.mq.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Mon, 03 Mar 2014 19:41:30 +0900 |
parents | d9e1c167943b |
children | 05cfcecb3aef |
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 |
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12 def _filename(repo): |
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13 """name of a branchcache file for a given repo or repoview""" |
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14 filename = "cache/branch2" |
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15 if repo.filtername: |
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16 filename = '%s-%s' % (filename, repo.filtername) |
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17 return filename |
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18 |
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19 def read(repo): |
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20 try: |
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21 f = repo.opener(_filename(repo)) |
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22 lines = f.read().split('\n') |
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23 f.close() |
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24 except (IOError, OSError): |
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25 return None |
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26 |
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27 try: |
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28 cachekey = lines.pop(0).split(" ", 2) |
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29 last, lrev = cachekey[:2] |
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30 last, lrev = bin(last), int(lrev) |
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31 filteredhash = None |
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32 if len(cachekey) > 2: |
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33 filteredhash = bin(cachekey[2]) |
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34 partial = branchcache(tipnode=last, tiprev=lrev, |
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35 filteredhash=filteredhash) |
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36 if not partial.validfor(repo): |
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37 # invalidate the cache |
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38 raise ValueError('tip differs') |
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39 for l in lines: |
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40 if not l: |
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41 continue |
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42 node, state, label = l.split(" ", 2) |
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43 if state not in 'oc': |
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44 raise ValueError('invalid branch state') |
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45 label = encoding.tolocal(label.strip()) |
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46 if not node in repo: |
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47 raise ValueError('node %s does not exist' % node) |
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48 node = bin(node) |
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49 partial.setdefault(label, []).append(node) |
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50 if state == 'c': |
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51 partial._closednodes.add(node) |
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52 except KeyboardInterrupt: |
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53 raise |
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54 except Exception, inst: |
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55 if repo.ui.debugflag: |
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56 msg = 'invalid branchheads cache' |
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57 if repo.filtername is not None: |
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58 msg += ' (%s)' % repo.filtername |
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59 msg += ': %s\n' |
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60 repo.ui.warn(msg % inst) |
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61 partial = None |
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62 return partial |
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63 |
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64 |
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65 |
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66 ### Nearest subset relation |
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67 # Nearest subset of filter X is a filter Y so that: |
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68 # * Y is included in X, |
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69 # * X - Y is as small as possible. |
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70 # This create and ordering used for branchmap purpose. |
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71 # the ordering may be partial |
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72 subsettable = {None: 'visible', |
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73 'visible': 'served', |
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74 'served': 'immutable', |
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75 'immutable': 'base'} |
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76 |
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77 def updatecache(repo): |
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78 cl = repo.changelog |
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79 filtername = repo.filtername |
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80 partial = repo._branchcaches.get(filtername) |
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81 |
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82 revs = [] |
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83 if partial is None or not partial.validfor(repo): |
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84 partial = read(repo) |
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85 if partial is None: |
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86 subsetname = subsettable.get(filtername) |
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87 if subsetname is None: |
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88 partial = branchcache() |
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89 else: |
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90 subset = repo.filtered(subsetname) |
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91 partial = subset.branchmap().copy() |
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92 extrarevs = subset.changelog.filteredrevs - cl.filteredrevs |
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93 revs.extend(r for r in extrarevs if r <= partial.tiprev) |
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94 revs.extend(cl.revs(start=partial.tiprev + 1)) |
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95 if revs: |
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96 partial.update(repo, revs) |
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97 partial.write(repo) |
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98 assert partial.validfor(repo), filtername |
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99 repo._branchcaches[repo.filtername] = partial |
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100 |
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101 class branchcache(dict): |
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102 """A dict like object that hold branches heads cache. |
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103 |
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104 This cache is used to avoid costly computations to determine all the |
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105 branch heads of a repo. |
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106 |
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107 The cache is serialized on disk in the following format: |
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108 |
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109 <tip hex node> <tip rev number> [optional filtered repo hex hash] |
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110 <branch head hex node> <open/closed state> <branch name> |
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111 <branch head hex node> <open/closed state> <branch name> |
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112 ... |
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113 |
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114 The first line is used to check if the cache is still valid. If the |
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115 branch cache is for a filtered repo view, an optional third hash is |
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116 included that hashes the hashes of all filtered revisions. |
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117 |
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118 The open/closed state is represented by a single letter 'o' or 'c'. |
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119 This field can be used to avoid changelog reads when determining if a |
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120 branch head closes a branch or not. |
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121 """ |
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122 |
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123 def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev, |
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124 filteredhash=None, closednodes=None): |
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125 super(branchcache, self).__init__(entries) |
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126 self.tipnode = tipnode |
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127 self.tiprev = tiprev |
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128 self.filteredhash = filteredhash |
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129 # closednodes is a set of nodes that close their branch. If the branch |
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130 # cache has been updated, it may contain nodes that are no longer |
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131 # heads. |
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132 if closednodes is None: |
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133 self._closednodes = set() |
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134 else: |
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135 self._closednodes = closednodes |
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136 |
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137 def _hashfiltered(self, repo): |
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138 """build hash of revision filtered in the current cache |
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139 |
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140 Tracking tipnode and tiprev is not enough to ensure validity of the |
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141 cache as they do not help to distinct cache that ignored various |
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142 revision bellow tiprev. |
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143 |
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144 To detect such difference, we build a cache of all ignored revisions. |
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145 """ |
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146 cl = repo.changelog |
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147 if not cl.filteredrevs: |
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148 return None |
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149 key = None |
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150 revs = sorted(r for r in cl.filteredrevs if r <= self.tiprev) |
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151 if revs: |
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152 s = util.sha1() |
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153 for rev in revs: |
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154 s.update('%s;' % rev) |
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155 key = s.digest() |
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156 return key |
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157 |
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158 def validfor(self, repo): |
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159 """Is the cache content valid regarding a repo |
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160 |
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161 - False when cached tipnode is unknown or if we detect a strip. |
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162 - True when cache is up to date or a subset of current repo.""" |
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163 try: |
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164 return ((self.tipnode == repo.changelog.node(self.tiprev)) |
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165 and (self.filteredhash == self._hashfiltered(repo))) |
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166 except IndexError: |
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167 return False |
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168 |
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169 def _branchtip(self, heads): |
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170 '''Return tuple with last open head in heads and false, |
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171 otherwise return last closed head and true.''' |
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172 tip = heads[-1] |
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173 closed = True |
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174 for h in reversed(heads): |
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175 if h not in self._closednodes: |
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176 tip = h |
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177 closed = False |
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178 break |
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179 return tip, closed |
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180 |
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181 def branchtip(self, branch): |
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182 '''Return the tipmost open head on branch head, otherwise return the |
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183 tipmost closed head on branch. |
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184 Raise KeyError for unknown branch.''' |
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185 return self._branchtip(self[branch])[0] |
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186 |
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187 def branchheads(self, branch, closed=False): |
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188 heads = self[branch] |
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189 if not closed: |
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190 heads = [h for h in heads if h not in self._closednodes] |
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191 return heads |
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192 |
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193 def iterbranches(self): |
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194 for bn, heads in self.iteritems(): |
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195 yield (bn, heads) + self._branchtip(heads) |
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196 |
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197 def copy(self): |
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198 """return an deep copy of the branchcache object""" |
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199 return branchcache(self, self.tipnode, self.tiprev, self.filteredhash, |
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200 self._closednodes) |
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201 |
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202 def write(self, repo): |
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203 try: |
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204 f = repo.opener(_filename(repo), "w", atomictemp=True) |
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205 cachekey = [hex(self.tipnode), str(self.tiprev)] |
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206 if self.filteredhash is not None: |
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207 cachekey.append(hex(self.filteredhash)) |
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208 f.write(" ".join(cachekey) + '\n') |
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209 for label, nodes in sorted(self.iteritems()): |
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210 for node in nodes: |
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211 if node in self._closednodes: |
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212 state = 'c' |
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213 else: |
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214 state = 'o' |
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215 f.write("%s %s %s\n" % (hex(node), state, |
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216 encoding.fromlocal(label))) |
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217 f.close() |
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218 except (IOError, OSError, util.Abort): |
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219 # Abort may be raise by read only opener |
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220 pass |
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221 |
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222 def update(self, repo, revgen): |
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223 """Given a branchhead cache, self, that may have extra nodes or be |
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224 missing heads, and a generator of nodes that are strictly a superset of |
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225 heads missing, this function updates self to be correct. |
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226 """ |
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227 cl = repo.changelog |
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228 # collect new branch entries |
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229 newbranches = {} |
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230 getbranchinfo = cl.branchinfo |
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231 for r in revgen: |
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232 branch, closesbranch = getbranchinfo(r) |
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233 newbranches.setdefault(branch, []).append(r) |
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234 if closesbranch: |
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235 self._closednodes.add(cl.node(r)) |
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236 # if older branchheads are reachable from new ones, they aren't |
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237 # really branchheads. Note checking parents is insufficient: |
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238 # 1 (branch a) -> 2 (branch b) -> 3 (branch a) |
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239 for branch, newheadrevs in newbranches.iteritems(): |
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240 bheads = self.setdefault(branch, []) |
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241 bheadset = set(cl.rev(node) for node in bheads) |
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242 |
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243 # This have been tested True on all internal usage of this function. |
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244 # run it again in case of doubt |
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245 # assert not (set(bheadrevs) & set(newheadrevs)) |
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246 newheadrevs.sort() |
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247 bheadset.update(newheadrevs) |
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248 |
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249 # This loop prunes out two kinds of heads - heads that are |
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250 # superseded by a head in newheadrevs, and newheadrevs that are not |
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251 # heads because an existing head is their descendant. |
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252 while newheadrevs: |
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253 latest = newheadrevs.pop() |
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254 if latest not in bheadset: |
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255 continue |
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256 ancestors = set(cl.ancestors([latest], min(bheadset))) |
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257 bheadset -= ancestors |
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258 bheadrevs = sorted(bheadset) |
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259 self[branch] = [cl.node(rev) for rev in bheadrevs] |
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260 tiprev = bheadrevs[-1] |
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261 if tiprev > self.tiprev: |
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262 self.tipnode = cl.node(tiprev) |
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263 self.tiprev = tiprev |
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264 |
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265 if not self.validfor(repo): |
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266 # cache key are not valid anymore |
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267 self.tipnode = nullid |
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268 self.tiprev = nullrev |
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269 for heads in self.values(): |
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270 tiprev = max(cl.rev(node) for node in heads) |
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271 if tiprev > self.tiprev: |
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272 self.tipnode = cl.node(tiprev) |
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273 self.tiprev = tiprev |
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274 self.filteredhash = self._hashfiltered(repo) |