Mercurial > hg
annotate mercurial/branchmap.py @ 19942:2c886dedd902 stable
tests: move generaldelta test to inline python (issue4064)
author | Matt Mackall <mpm@selenic.com> |
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date | Mon, 21 Oct 2013 10:50:58 -0700 |
parents | a32ef044b99a |
children | 175c6fd8cacc |
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, repoview |
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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/branchheads" |
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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, label = l.split(" ", 1) |
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43 label = encoding.tolocal(label.strip()) |
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44 if not node in repo: |
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45 raise ValueError('node %s does not exist' % node) |
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46 partial.setdefault(label, []).append(bin(node)) |
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47 except KeyboardInterrupt: |
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48 raise |
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49 except Exception, inst: |
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50 if repo.ui.debugflag: |
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51 msg = 'invalid branchheads cache' |
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52 if repo.filtername is not None: |
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53 msg += ' (%s)' % repo.filtername |
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54 msg += ': %s\n' |
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55 repo.ui.warn(msg % inst) |
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56 partial = None |
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57 return partial |
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58 |
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59 |
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60 |
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61 def updatecache(repo): |
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62 cl = repo.changelog |
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63 filtername = repo.filtername |
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64 partial = repo._branchcaches.get(filtername) |
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65 |
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66 revs = [] |
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67 if partial is None or not partial.validfor(repo): |
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68 partial = read(repo) |
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69 if partial is None: |
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70 subsetname = repoview.subsettable.get(filtername) |
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71 if subsetname is None: |
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72 partial = branchcache() |
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73 else: |
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74 subset = repo.filtered(subsetname) |
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75 partial = subset.branchmap().copy() |
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76 extrarevs = subset.changelog.filteredrevs - cl.filteredrevs |
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77 revs.extend(r for r in extrarevs if r <= partial.tiprev) |
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78 revs.extend(cl.revs(start=partial.tiprev + 1)) |
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79 if revs: |
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80 partial.update(repo, revs) |
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81 partial.write(repo) |
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82 assert partial.validfor(repo), filtername |
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83 repo._branchcaches[repo.filtername] = partial |
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84 |
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85 class branchcache(dict): |
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86 """A dict like object that hold branches heads cache""" |
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87 |
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88 def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev, |
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89 filteredhash=None): |
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90 super(branchcache, self).__init__(entries) |
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91 self.tipnode = tipnode |
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92 self.tiprev = tiprev |
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93 self.filteredhash = filteredhash |
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94 |
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95 def _hashfiltered(self, repo): |
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96 """build hash of revision filtered in the current cache |
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97 |
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98 Tracking tipnode and tiprev is not enough to ensure validity of the |
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99 cache as they do not help to distinct cache that ignored various |
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100 revision bellow tiprev. |
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101 |
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102 To detect such difference, we build a cache of all ignored revisions. |
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103 """ |
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104 cl = repo.changelog |
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105 if not cl.filteredrevs: |
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106 return None |
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107 key = None |
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108 revs = sorted(r for r in cl.filteredrevs if r <= self.tiprev) |
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109 if revs: |
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110 s = util.sha1() |
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111 for rev in revs: |
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112 s.update('%s;' % rev) |
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113 key = s.digest() |
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114 return key |
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115 |
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116 def validfor(self, repo): |
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117 """Is the cache content valid regarding a repo |
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118 |
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119 - False when cached tipnode is unknown or if we detect a strip. |
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120 - True when cache is up to date or a subset of current repo.""" |
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121 try: |
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122 return ((self.tipnode == repo.changelog.node(self.tiprev)) |
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123 and (self.filteredhash == self._hashfiltered(repo))) |
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124 except IndexError: |
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125 return False |
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126 |
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127 def copy(self): |
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128 """return an deep copy of the branchcache object""" |
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129 return branchcache(self, self.tipnode, self.tiprev, self.filteredhash) |
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130 |
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131 def write(self, repo): |
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132 try: |
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133 f = repo.opener(_filename(repo), "w", atomictemp=True) |
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134 cachekey = [hex(self.tipnode), str(self.tiprev)] |
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135 if self.filteredhash is not None: |
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136 cachekey.append(hex(self.filteredhash)) |
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137 f.write(" ".join(cachekey) + '\n') |
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138 for label, nodes in sorted(self.iteritems()): |
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139 for node in nodes: |
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140 f.write("%s %s\n" % (hex(node), encoding.fromlocal(label))) |
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141 f.close() |
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142 except (IOError, OSError, util.Abort): |
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143 # Abort may be raise by read only opener |
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144 pass |
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145 |
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146 def update(self, repo, revgen): |
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147 """Given a branchhead cache, self, that may have extra nodes or be |
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148 missing heads, and a generator of nodes that are at least a superset of |
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149 heads missing, this function updates self to be correct. |
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150 """ |
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151 cl = repo.changelog |
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152 # collect new branch entries |
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153 newbranches = {} |
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154 getbranch = cl.branch |
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155 for r in revgen: |
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156 newbranches.setdefault(getbranch(r), []).append(cl.node(r)) |
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157 # if older branchheads are reachable from new ones, they aren't |
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158 # really branchheads. Note checking parents is insufficient: |
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159 # 1 (branch a) -> 2 (branch b) -> 3 (branch a) |
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160 for branch, newnodes in newbranches.iteritems(): |
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161 bheads = self.setdefault(branch, []) |
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162 # Remove candidate heads that no longer are in the repo (e.g., as |
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163 # the result of a strip that just happened). Avoid using 'node in |
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164 # self' here because that dives down into branchcache code somewhat |
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165 # recursively. |
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166 bheadrevs = [cl.rev(node) for node in bheads |
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167 if cl.hasnode(node)] |
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168 newheadrevs = [cl.rev(node) for node in newnodes |
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169 if cl.hasnode(node)] |
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170 ctxisnew = bheadrevs and min(newheadrevs) > max(bheadrevs) |
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171 # Remove duplicates - nodes that are in newheadrevs and are already |
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172 # in bheadrevs. This can happen if you strip a node whose parent |
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173 # was already a head (because they're on different branches). |
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174 bheadrevs = sorted(set(bheadrevs).union(newheadrevs)) |
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175 |
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176 # Starting from tip means fewer passes over reachable. If we know |
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177 # the new candidates are not ancestors of existing heads, we don't |
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178 # have to examine ancestors of existing heads |
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179 if ctxisnew: |
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180 iterrevs = sorted(newheadrevs) |
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181 else: |
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182 iterrevs = list(bheadrevs) |
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183 |
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184 # This loop prunes out two kinds of heads - heads that are |
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185 # superseded by a head in newheadrevs, and newheadrevs that are not |
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186 # heads because an existing head is their descendant. |
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187 while iterrevs: |
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188 latest = iterrevs.pop() |
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189 if latest not in bheadrevs: |
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190 continue |
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191 ancestors = set(cl.ancestors([latest], |
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192 bheadrevs[0])) |
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193 if ancestors: |
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194 bheadrevs = [b for b in bheadrevs if b not in ancestors] |
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195 self[branch] = [cl.node(rev) for rev in bheadrevs] |
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196 tiprev = max(bheadrevs) |
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197 if tiprev > self.tiprev: |
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198 self.tipnode = cl.node(tiprev) |
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199 self.tiprev = tiprev |
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200 |
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201 if not self.validfor(repo): |
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202 # cache key are not valid anymore |
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203 self.tipnode = nullid |
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204 self.tiprev = nullrev |
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205 for heads in self.values(): |
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206 tiprev = max(cl.rev(node) for node in heads) |
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207 if tiprev > self.tiprev: |
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208 self.tipnode = cl.node(tiprev) |
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branchmap: make update a method
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
18130
diff
changeset
|
209 self.tiprev = tiprev |
18168
c351759ab0a0
branchmap: takes filtered revision in account for cache calculation
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
18167
diff
changeset
|
210 self.filteredhash = self._hashfiltered(repo) |