Mercurial > hg
annotate mercurial/branchmap.py @ 39122:5d3b58472660
filemerge: set actual capabilities of internal merge tools
This information is used to detect actual capabilities of internal
merge tools by subsequent patches.
For convenience, this patch assumes that merge tools typed as
"nomerge" have both binary files and symlinks capabilities.
author | FUJIWARA Katsunori <foozy@lares.dti.ne.jp> |
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date | Tue, 14 Aug 2018 20:08:27 +0900 |
parents | 2a4bfbb52111 |
children | b892df0766e1 |
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 __future__ import absolute_import |
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9 |
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10 import struct |
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11 |
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12 from .node import ( |
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13 bin, |
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14 hex, |
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15 nullid, |
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16 nullrev, |
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17 ) |
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18 from . import ( |
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19 encoding, |
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20 error, |
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21 pycompat, |
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22 scmutil, |
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23 util, |
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24 ) |
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25 from .utils import ( |
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26 stringutil, |
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27 ) |
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28 |
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29 calcsize = struct.calcsize |
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30 pack_into = struct.pack_into |
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31 unpack_from = struct.unpack_from |
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32 |
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33 def _filename(repo): |
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34 """name of a branchcache file for a given repo or repoview""" |
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35 filename = "branch2" |
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36 if repo.filtername: |
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37 filename = '%s-%s' % (filename, repo.filtername) |
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38 return filename |
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39 |
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40 def read(repo): |
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41 try: |
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42 f = repo.cachevfs(_filename(repo)) |
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43 cachekey = next(f).split(" ", 2) |
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44 last, lrev = cachekey[:2] |
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45 last, lrev = bin(last), int(lrev) |
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46 filteredhash = None |
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47 if len(cachekey) > 2: |
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48 filteredhash = bin(cachekey[2]) |
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49 partial = branchcache(tipnode=last, tiprev=lrev, |
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50 filteredhash=filteredhash) |
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51 if not partial.validfor(repo): |
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52 # invalidate the cache |
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53 raise ValueError(r'tip differs') |
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54 cl = repo.changelog |
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55 for l in f: |
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56 if not l: |
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57 continue |
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58 node, state, label = l.split(" ", 2) |
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59 if state not in 'oc': |
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60 raise ValueError(r'invalid branch state') |
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61 label = encoding.tolocal(label.strip()) |
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62 node = bin(node) |
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63 if not cl.hasnode(node): |
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64 raise ValueError( |
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65 r'node %s does not exist' % pycompat.sysstr(hex(node))) |
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66 partial.setdefault(label, []).append(node) |
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67 if state == 'c': |
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68 partial._closednodes.add(node) |
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69 |
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70 except (IOError, OSError): |
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71 return None |
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72 |
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73 except Exception as inst: |
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74 if repo.ui.debugflag: |
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75 msg = 'invalid branchheads cache' |
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76 if repo.filtername is not None: |
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77 msg += ' (%s)' % repo.filtername |
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78 msg += ': %s\n' |
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79 repo.ui.debug(msg % pycompat.bytestr(inst)) |
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80 partial = None |
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81 return partial |
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82 |
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83 ### Nearest subset relation |
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84 # Nearest subset of filter X is a filter Y so that: |
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85 # * Y is included in X, |
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86 # * X - Y is as small as possible. |
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87 # This create and ordering used for branchmap purpose. |
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88 # the ordering may be partial |
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89 subsettable = {None: 'visible', |
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90 'visible-hidden': 'visible', |
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91 'visible': 'served', |
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92 'served': 'immutable', |
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93 'immutable': 'base'} |
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94 |
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95 def updatecache(repo): |
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96 cl = repo.changelog |
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97 filtername = repo.filtername |
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98 partial = repo._branchcaches.get(filtername) |
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99 |
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100 revs = [] |
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101 if partial is None or not partial.validfor(repo): |
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102 partial = read(repo) |
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103 if partial is None: |
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104 subsetname = subsettable.get(filtername) |
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105 if subsetname is None: |
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106 partial = branchcache() |
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107 else: |
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108 subset = repo.filtered(subsetname) |
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109 partial = subset.branchmap().copy() |
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110 extrarevs = subset.changelog.filteredrevs - cl.filteredrevs |
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111 revs.extend(r for r in extrarevs if r <= partial.tiprev) |
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112 revs.extend(cl.revs(start=partial.tiprev + 1)) |
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113 if revs: |
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114 partial.update(repo, revs) |
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115 partial.write(repo) |
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116 |
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117 assert partial.validfor(repo), filtername |
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118 repo._branchcaches[repo.filtername] = partial |
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119 |
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120 def replacecache(repo, bm): |
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121 """Replace the branchmap cache for a repo with a branch mapping. |
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122 |
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123 This is likely only called during clone with a branch map from a remote. |
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124 """ |
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125 rbheads = [] |
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126 closed = [] |
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127 for bheads in bm.itervalues(): |
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128 rbheads.extend(bheads) |
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129 for h in bheads: |
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130 r = repo.changelog.rev(h) |
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131 b, c = repo.changelog.branchinfo(r) |
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132 if c: |
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133 closed.append(h) |
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134 |
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135 if rbheads: |
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136 rtiprev = max((int(repo.changelog.rev(node)) |
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137 for node in rbheads)) |
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138 cache = branchcache(bm, |
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139 repo[rtiprev].node(), |
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140 rtiprev, |
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141 closednodes=closed) |
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142 |
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143 # Try to stick it as low as possible |
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144 # filter above served are unlikely to be fetch from a clone |
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145 for candidate in ('base', 'immutable', 'served'): |
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146 rview = repo.filtered(candidate) |
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147 if cache.validfor(rview): |
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148 repo._branchcaches[candidate] = cache |
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149 cache.write(rview) |
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150 break |
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151 |
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152 class branchcache(dict): |
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153 """A dict like object that hold branches heads cache. |
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154 |
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155 This cache is used to avoid costly computations to determine all the |
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156 branch heads of a repo. |
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157 |
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158 The cache is serialized on disk in the following format: |
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159 |
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160 <tip hex node> <tip rev number> [optional filtered repo hex hash] |
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161 <branch head hex node> <open/closed state> <branch name> |
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162 <branch head hex node> <open/closed state> <branch name> |
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163 ... |
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164 |
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165 The first line is used to check if the cache is still valid. If the |
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166 branch cache is for a filtered repo view, an optional third hash is |
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167 included that hashes the hashes of all filtered revisions. |
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168 |
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169 The open/closed state is represented by a single letter 'o' or 'c'. |
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170 This field can be used to avoid changelog reads when determining if a |
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171 branch head closes a branch or not. |
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172 """ |
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173 |
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174 def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev, |
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175 filteredhash=None, closednodes=None): |
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176 super(branchcache, self).__init__(entries) |
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177 self.tipnode = tipnode |
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178 self.tiprev = tiprev |
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179 self.filteredhash = filteredhash |
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180 # closednodes is a set of nodes that close their branch. If the branch |
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181 # cache has been updated, it may contain nodes that are no longer |
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182 # heads. |
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183 if closednodes is None: |
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184 self._closednodes = set() |
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185 else: |
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186 self._closednodes = closednodes |
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187 |
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188 def validfor(self, repo): |
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189 """Is the cache content valid regarding a repo |
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190 |
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191 - False when cached tipnode is unknown or if we detect a strip. |
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192 - True when cache is up to date or a subset of current repo.""" |
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193 try: |
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194 return ((self.tipnode == repo.changelog.node(self.tiprev)) |
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195 and (self.filteredhash == \ |
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196 scmutil.filteredhash(repo, self.tiprev))) |
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197 except IndexError: |
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198 return False |
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199 |
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200 def _branchtip(self, heads): |
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201 '''Return tuple with last open head in heads and false, |
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202 otherwise return last closed head and true.''' |
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203 tip = heads[-1] |
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204 closed = True |
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205 for h in reversed(heads): |
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206 if h not in self._closednodes: |
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207 tip = h |
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208 closed = False |
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209 break |
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210 return tip, closed |
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211 |
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212 def branchtip(self, branch): |
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213 '''Return the tipmost open head on branch head, otherwise return the |
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214 tipmost closed head on branch. |
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215 Raise KeyError for unknown branch.''' |
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216 return self._branchtip(self[branch])[0] |
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217 |
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218 def iteropen(self, nodes): |
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219 return (n for n in nodes if n not in self._closednodes) |
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220 |
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221 def branchheads(self, branch, closed=False): |
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222 heads = self[branch] |
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223 if not closed: |
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224 heads = list(self.iteropen(heads)) |
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225 return heads |
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226 |
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227 def iterbranches(self): |
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228 for bn, heads in self.iteritems(): |
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229 yield (bn, heads) + self._branchtip(heads) |
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230 |
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231 def copy(self): |
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232 """return an deep copy of the branchcache object""" |
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233 return branchcache(self, self.tipnode, self.tiprev, self.filteredhash, |
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234 self._closednodes) |
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235 |
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236 def write(self, repo): |
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237 try: |
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238 f = repo.cachevfs(_filename(repo), "w", atomictemp=True) |
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239 cachekey = [hex(self.tipnode), '%d' % self.tiprev] |
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240 if self.filteredhash is not None: |
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241 cachekey.append(hex(self.filteredhash)) |
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242 f.write(" ".join(cachekey) + '\n') |
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243 nodecount = 0 |
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244 for label, nodes in sorted(self.iteritems()): |
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245 for node in nodes: |
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246 nodecount += 1 |
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247 if node in self._closednodes: |
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248 state = 'c' |
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249 else: |
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250 state = 'o' |
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251 f.write("%s %s %s\n" % (hex(node), state, |
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252 encoding.fromlocal(label))) |
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253 f.close() |
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254 repo.ui.log('branchcache', |
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255 'wrote %s branch cache with %d labels and %d nodes\n', |
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256 repo.filtername, len(self), nodecount) |
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257 except (IOError, OSError, error.Abort) as inst: |
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258 # Abort may be raised by read only opener, so log and continue |
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259 repo.ui.debug("couldn't write branch cache: %s\n" % |
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260 stringutil.forcebytestr(inst)) |
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261 |
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262 def update(self, repo, revgen): |
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263 """Given a branchhead cache, self, that may have extra nodes or be |
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264 missing heads, and a generator of nodes that are strictly a superset of |
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265 heads missing, this function updates self to be correct. |
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266 """ |
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267 starttime = util.timer() |
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268 cl = repo.changelog |
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269 # collect new branch entries |
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270 newbranches = {} |
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271 getbranchinfo = repo.revbranchcache().branchinfo |
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272 for r in revgen: |
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273 branch, closesbranch = getbranchinfo(r) |
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274 newbranches.setdefault(branch, []).append(r) |
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275 if closesbranch: |
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276 self._closednodes.add(cl.node(r)) |
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277 |
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278 # fetch current topological heads to speed up filtering |
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279 topoheads = set(cl.headrevs()) |
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280 |
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281 # if older branchheads are reachable from new ones, they aren't |
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282 # really branchheads. Note checking parents is insufficient: |
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283 # 1 (branch a) -> 2 (branch b) -> 3 (branch a) |
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284 for branch, newheadrevs in newbranches.iteritems(): |
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285 bheads = self.setdefault(branch, []) |
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286 bheadset = set(cl.rev(node) for node in bheads) |
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287 |
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288 # This have been tested True on all internal usage of this function. |
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289 # run it again in case of doubt |
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290 # assert not (set(bheadrevs) & set(newheadrevs)) |
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291 newheadrevs.sort() |
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292 bheadset.update(newheadrevs) |
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293 |
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294 # This prunes out two kinds of heads - heads that are superseded by |
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295 # a head in newheadrevs, and newheadrevs that are not heads because |
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296 # an existing head is their descendant. |
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297 uncertain = bheadset - topoheads |
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298 if uncertain: |
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299 floorrev = min(uncertain) |
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300 ancestors = set(cl.ancestors(newheadrevs, floorrev)) |
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301 bheadset -= ancestors |
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302 bheadrevs = sorted(bheadset) |
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303 self[branch] = [cl.node(rev) for rev in bheadrevs] |
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304 tiprev = bheadrevs[-1] |
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305 if tiprev > self.tiprev: |
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306 self.tipnode = cl.node(tiprev) |
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307 self.tiprev = tiprev |
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308 |
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309 if not self.validfor(repo): |
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310 # cache key are not valid anymore |
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311 self.tipnode = nullid |
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312 self.tiprev = nullrev |
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313 for heads in self.values(): |
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314 tiprev = max(cl.rev(node) for node in heads) |
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315 if tiprev > self.tiprev: |
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316 self.tipnode = cl.node(tiprev) |
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317 self.tiprev = tiprev |
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318 self.filteredhash = scmutil.filteredhash(repo, self.tiprev) |
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319 |
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320 duration = util.timer() - starttime |
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321 repo.ui.log('branchcache', 'updated %s branch cache in %.4f seconds\n', |
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322 repo.filtername, duration) |
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323 |
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324 # Revision branch info cache |
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325 |
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326 _rbcversion = '-v1' |
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327 _rbcnames = 'rbc-names' + _rbcversion |
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328 _rbcrevs = 'rbc-revs' + _rbcversion |
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329 # [4 byte hash prefix][4 byte branch name number with sign bit indicating open] |
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330 _rbcrecfmt = '>4sI' |
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331 _rbcrecsize = calcsize(_rbcrecfmt) |
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332 _rbcnodelen = 4 |
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333 _rbcbranchidxmask = 0x7fffffff |
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334 _rbccloseflag = 0x80000000 |
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335 |
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336 class revbranchcache(object): |
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337 """Persistent cache, mapping from revision number to branch name and close. |
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338 This is a low level cache, independent of filtering. |
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339 |
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340 Branch names are stored in rbc-names in internal encoding separated by 0. |
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341 rbc-names is append-only, and each branch name is only stored once and will |
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342 thus have a unique index. |
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343 |
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344 The branch info for each revision is stored in rbc-revs as constant size |
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345 records. The whole file is read into memory, but it is only 'parsed' on |
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346 demand. The file is usually append-only but will be truncated if repo |
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347 modification is detected. |
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348 The record for each revision contains the first 4 bytes of the |
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349 corresponding node hash, and the record is only used if it still matches. |
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350 Even a completely trashed rbc-revs fill thus still give the right result |
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351 while converging towards full recovery ... assuming no incorrectly matching |
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352 node hashes. |
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353 The record also contains 4 bytes where 31 bits contains the index of the |
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354 branch and the last bit indicate that it is a branch close commit. |
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355 The usage pattern for rbc-revs is thus somewhat similar to 00changelog.i |
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356 and will grow with it but be 1/8th of its size. |
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357 """ |
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358 |
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359 def __init__(self, repo, readonly=True): |
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360 assert repo.filtername is None |
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361 self._repo = repo |
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362 self._names = [] # branch names in local encoding with static index |
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363 self._rbcrevs = bytearray() |
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364 self._rbcsnameslen = 0 # length of names read at _rbcsnameslen |
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365 try: |
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366 bndata = repo.cachevfs.read(_rbcnames) |
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367 self._rbcsnameslen = len(bndata) # for verification before writing |
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368 if bndata: |
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369 self._names = [encoding.tolocal(bn) |
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370 for bn in bndata.split('\0')] |
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371 except (IOError, OSError): |
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372 if readonly: |
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373 # don't try to use cache - fall back to the slow path |
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374 self.branchinfo = self._branchinfo |
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375 |
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376 if self._names: |
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377 try: |
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378 data = repo.cachevfs.read(_rbcrevs) |
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379 self._rbcrevs[:] = data |
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380 except (IOError, OSError) as inst: |
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381 repo.ui.debug("couldn't read revision branch cache: %s\n" % |
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382 stringutil.forcebytestr(inst)) |
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383 # remember number of good records on disk |
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384 self._rbcrevslen = min(len(self._rbcrevs) // _rbcrecsize, |
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385 len(repo.changelog)) |
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386 if self._rbcrevslen == 0: |
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387 self._names = [] |
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388 self._rbcnamescount = len(self._names) # number of names read at |
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389 # _rbcsnameslen |
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390 self._namesreverse = dict((b, r) for r, b in enumerate(self._names)) |
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391 |
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392 def _clear(self): |
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393 self._rbcsnameslen = 0 |
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394 del self._names[:] |
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395 self._rbcnamescount = 0 |
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396 self._namesreverse.clear() |
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397 self._rbcrevslen = len(self._repo.changelog) |
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398 self._rbcrevs = bytearray(self._rbcrevslen * _rbcrecsize) |
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399 |
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400 def branchinfo(self, rev): |
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401 """Return branch name and close flag for rev, using and updating |
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402 persistent cache.""" |
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403 changelog = self._repo.changelog |
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404 rbcrevidx = rev * _rbcrecsize |
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405 |
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406 # avoid negative index, changelog.read(nullrev) is fast without cache |
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407 if rev == nullrev: |
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408 return changelog.branchinfo(rev) |
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409 |
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410 # if requested rev isn't allocated, grow and cache the rev info |
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411 if len(self._rbcrevs) < rbcrevidx + _rbcrecsize: |
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412 return self._branchinfo(rev) |
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413 |
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414 # fast path: extract data from cache, use it if node is matching |
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415 reponode = changelog.node(rev)[:_rbcnodelen] |
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416 cachenode, branchidx = unpack_from( |
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417 _rbcrecfmt, util.buffer(self._rbcrevs), rbcrevidx) |
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418 close = bool(branchidx & _rbccloseflag) |
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419 if close: |
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420 branchidx &= _rbcbranchidxmask |
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421 if cachenode == '\0\0\0\0': |
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422 pass |
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423 elif cachenode == reponode: |
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424 try: |
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425 return self._names[branchidx], close |
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426 except IndexError: |
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427 # recover from invalid reference to unknown branch |
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428 self._repo.ui.debug("referenced branch names not found" |
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429 " - rebuilding revision branch cache from scratch\n") |
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430 self._clear() |
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431 else: |
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432 # rev/node map has changed, invalidate the cache from here up |
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433 self._repo.ui.debug("history modification detected - truncating " |
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434 "revision branch cache to revision %d\n" % rev) |
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435 truncate = rbcrevidx + _rbcrecsize |
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436 del self._rbcrevs[truncate:] |
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437 self._rbcrevslen = min(self._rbcrevslen, truncate) |
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438 |
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439 # fall back to slow path and make sure it will be written to disk |
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440 return self._branchinfo(rev) |
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441 |
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442 def _branchinfo(self, rev): |
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443 """Retrieve branch info from changelog and update _rbcrevs""" |
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444 changelog = self._repo.changelog |
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445 b, close = changelog.branchinfo(rev) |
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446 if b in self._namesreverse: |
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447 branchidx = self._namesreverse[b] |
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448 else: |
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449 branchidx = len(self._names) |
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450 self._names.append(b) |
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451 self._namesreverse[b] = branchidx |
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452 reponode = changelog.node(rev) |
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453 if close: |
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454 branchidx |= _rbccloseflag |
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455 self._setcachedata(rev, reponode, branchidx) |
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456 return b, close |
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457 |
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458 def setdata(self, branch, rev, node, close): |
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459 """add new data information to the cache""" |
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460 if branch in self._namesreverse: |
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461 branchidx = self._namesreverse[branch] |
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462 else: |
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463 branchidx = len(self._names) |
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464 self._names.append(branch) |
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465 self._namesreverse[branch] = branchidx |
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466 if close: |
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467 branchidx |= _rbccloseflag |
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468 self._setcachedata(rev, node, branchidx) |
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469 # If no cache data were readable (non exists, bad permission, etc) |
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470 # the cache was bypassing itself by setting: |
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471 # |
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472 # self.branchinfo = self._branchinfo |
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473 # |
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474 # Since we now have data in the cache, we need to drop this bypassing. |
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475 if 'branchinfo' in vars(self): |
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476 del self.branchinfo |
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477 |
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478 def _setcachedata(self, rev, node, branchidx): |
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479 """Writes the node's branch data to the in-memory cache data.""" |
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480 if rev == nullrev: |
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481 return |
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482 rbcrevidx = rev * _rbcrecsize |
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483 if len(self._rbcrevs) < rbcrevidx + _rbcrecsize: |
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484 self._rbcrevs.extend('\0' * |
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485 (len(self._repo.changelog) * _rbcrecsize - |
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486 len(self._rbcrevs))) |
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487 pack_into(_rbcrecfmt, self._rbcrevs, rbcrevidx, node, branchidx) |
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488 self._rbcrevslen = min(self._rbcrevslen, rev) |
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489 |
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490 tr = self._repo.currenttransaction() |
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491 if tr: |
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492 tr.addfinalize('write-revbranchcache', self.write) |
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493 |
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494 def write(self, tr=None): |
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495 """Save branch cache if it is dirty.""" |
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496 repo = self._repo |
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497 wlock = None |
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498 step = '' |
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499 try: |
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500 if self._rbcnamescount < len(self._names): |
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501 step = ' names' |
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502 wlock = repo.wlock(wait=False) |
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503 if self._rbcnamescount != 0: |
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504 f = repo.cachevfs.open(_rbcnames, 'ab') |
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505 if f.tell() == self._rbcsnameslen: |
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506 f.write('\0') |
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507 else: |
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508 f.close() |
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509 repo.ui.debug("%s changed - rewriting it\n" % _rbcnames) |
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510 self._rbcnamescount = 0 |
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511 self._rbcrevslen = 0 |
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512 if self._rbcnamescount == 0: |
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513 # before rewriting names, make sure references are removed |
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514 repo.cachevfs.unlinkpath(_rbcrevs, ignoremissing=True) |
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515 f = repo.cachevfs.open(_rbcnames, 'wb') |
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516 f.write('\0'.join(encoding.fromlocal(b) |
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517 for b in self._names[self._rbcnamescount:])) |
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518 self._rbcsnameslen = f.tell() |
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519 f.close() |
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520 self._rbcnamescount = len(self._names) |
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521 |
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522 start = self._rbcrevslen * _rbcrecsize |
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523 if start != len(self._rbcrevs): |
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524 step = '' |
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525 if wlock is None: |
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526 wlock = repo.wlock(wait=False) |
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527 revs = min(len(repo.changelog), |
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528 len(self._rbcrevs) // _rbcrecsize) |
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529 f = repo.cachevfs.open(_rbcrevs, 'ab') |
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530 if f.tell() != start: |
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531 repo.ui.debug("truncating cache/%s to %d\n" |
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532 % (_rbcrevs, start)) |
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533 f.seek(start) |
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534 if f.tell() != start: |
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535 start = 0 |
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536 f.seek(start) |
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537 f.truncate() |
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538 end = revs * _rbcrecsize |
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539 f.write(self._rbcrevs[start:end]) |
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540 f.close() |
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541 self._rbcrevslen = revs |
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542 except (IOError, OSError, error.Abort, error.LockError) as inst: |
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543 repo.ui.debug("couldn't write revision branch cache%s: %s\n" |
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544 % (step, stringutil.forcebytestr(inst))) |
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545 finally: |
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546 if wlock is not None: |
0d588332ad2c
branchmap: acquires lock before writting the rev branch cache
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
29743
diff
changeset
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547 wlock.release() |