Mercurial > hg
annotate mercurial/repoview.py @ 32129:f0ea0f642627
py3: make posix.getuser return a bytes
author | Pulkit Goyal <7895pulkit@gmail.com> |
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date | Fri, 21 Apr 2017 00:53:38 +0530 |
parents | 55390e97fdd2 |
children | 06aa645e2372 |
rev | line source |
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1 # repoview.py - Filtered view of a localrepo object |
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2 # |
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3 # Copyright 2012 Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
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4 # Logilab SA <contact@logilab.fr> |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
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7 # GNU General Public License version 2 or any later version. |
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8 |
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9 from __future__ import absolute_import |
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10 |
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11 import copy |
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12 import hashlib |
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13 import heapq |
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14 import struct |
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15 |
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16 from .node import nullrev |
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17 from . import ( |
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18 error, |
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19 obsolete, |
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20 phases, |
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21 tags as tagsmod, |
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22 ) |
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23 |
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24 def hideablerevs(repo): |
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25 """Revision candidates to be hidden |
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26 |
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27 This is a standalone function to allow extensions to wrap it. |
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28 |
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29 Because we use the set of immutable changesets as a fallback subset in |
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30 branchmap (see mercurial.branchmap.subsettable), you cannot set "public" |
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31 changesets as "hideable". Doing so would break multiple code assertions and |
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32 lead to crashes.""" |
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33 return obsolete.getrevs(repo, 'obsolete') |
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34 |
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35 def _getstatichidden(repo): |
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36 """Revision to be hidden (disregarding dynamic blocker) |
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37 |
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38 To keep a consistent graph, we cannot hide any revisions with |
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39 non-hidden descendants. This function computes the set of |
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40 revisions that could be hidden while keeping the graph consistent. |
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41 |
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42 A second pass will be done to apply "dynamic blocker" like bookmarks or |
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43 working directory parents. |
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44 |
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45 """ |
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46 assert not repo.changelog.filteredrevs |
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47 hidden = set(hideablerevs(repo)) |
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48 if hidden: |
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49 getphase = repo._phasecache.phase |
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50 getparentrevs = repo.changelog.parentrevs |
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51 # Skip heads which are public (guaranteed to not be hidden) |
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52 heap = [-r for r in repo.changelog.headrevs() if getphase(repo, r)] |
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53 heapq.heapify(heap) |
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54 heappop = heapq.heappop |
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55 heappush = heapq.heappush |
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56 seen = set() # no need to init it with heads, they have no children |
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57 while heap: |
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58 rev = -heappop(heap) |
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59 # All children have been processed so at that point, if no children |
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60 # removed 'rev' from the 'hidden' set, 'rev' is going to be hidden. |
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61 blocker = rev not in hidden |
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62 for parent in getparentrevs(rev): |
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63 if parent == nullrev: |
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64 continue |
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65 if blocker: |
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66 # If visible, ensure parent will be visible too |
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67 hidden.discard(parent) |
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68 # - Avoid adding the same revision twice |
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69 # - Skip nodes which are public (guaranteed to not be hidden) |
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70 pre = len(seen) |
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71 seen.add(parent) |
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72 if pre < len(seen) and getphase(repo, rev): |
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73 heappush(heap, -parent) |
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74 return hidden |
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75 |
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76 def _getdynamicblockers(repo): |
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77 """Non-cacheable revisions blocking hidden changesets from being filtered. |
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78 |
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79 Get revisions that will block hidden changesets and are likely to change, |
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80 but unlikely to create hidden blockers. They won't be cached, so be careful |
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81 with adding additional computation.""" |
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82 |
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83 cl = repo.changelog |
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84 blockers = set() |
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85 blockers.update([par.rev() for par in repo[None].parents()]) |
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86 blockers.update([cl.rev(bm) for bm in repo._bookmarks.values()]) |
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87 |
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88 tags = {} |
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89 tagsmod.readlocaltags(repo.ui, repo, tags, {}) |
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90 if tags: |
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91 rev, nodemap = cl.rev, cl.nodemap |
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92 blockers.update(rev(t[0]) for t in tags.values() if t[0] in nodemap) |
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93 return blockers |
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94 |
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95 cacheversion = 1 |
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96 cachefile = 'cache/hidden' |
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97 |
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98 def cachehash(repo, hideable): |
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99 """return sha1 hash of repository data to identify a valid cache. |
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100 |
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101 We calculate a sha1 of repo heads and the content of the obsstore and write |
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102 it to the cache. Upon reading we can easily validate by checking the hash |
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103 against the stored one and discard the cache in case the hashes don't match. |
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104 """ |
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105 h = hashlib.sha1() |
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106 h.update(''.join(repo.heads())) |
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107 h.update('%d' % hash(frozenset(hideable))) |
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108 return h.digest() |
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109 |
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110 def _writehiddencache(cachefile, cachehash, hidden): |
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111 """write hidden data to a cache file""" |
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112 data = struct.pack('>%ii' % len(hidden), *sorted(hidden)) |
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113 cachefile.write(struct.pack(">H", cacheversion)) |
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114 cachefile.write(cachehash) |
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115 cachefile.write(data) |
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116 |
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117 def trywritehiddencache(repo, hideable, hidden): |
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118 """write cache of hidden changesets to disk |
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119 |
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120 Will not write the cache if a wlock cannot be obtained lazily. |
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121 The cache consists of a head of 22byte: |
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122 2 byte version number of the cache |
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123 20 byte sha1 to validate the cache |
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124 n*4 byte hidden revs |
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125 """ |
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126 wlock = fh = None |
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127 try: |
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128 wlock = repo.wlock(wait=False) |
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129 # write cache to file |
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130 newhash = cachehash(repo, hideable) |
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131 fh = repo.vfs.open(cachefile, 'w+b', atomictemp=True) |
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132 _writehiddencache(fh, newhash, hidden) |
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133 fh.close() |
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134 except (IOError, OSError): |
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135 repo.ui.debug('error writing hidden changesets cache\n') |
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136 except error.LockHeld: |
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137 repo.ui.debug('cannot obtain lock to write hidden changesets cache\n') |
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138 finally: |
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139 if wlock: |
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140 wlock.release() |
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141 |
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142 def _readhiddencache(repo, cachefilename, newhash): |
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143 hidden = fh = None |
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144 try: |
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145 if repo.vfs.exists(cachefile): |
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146 fh = repo.vfs.open(cachefile, 'rb') |
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147 version, = struct.unpack(">H", fh.read(2)) |
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148 oldhash = fh.read(20) |
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149 if (cacheversion, oldhash) == (version, newhash): |
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150 # cache is valid, so we can start reading the hidden revs |
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151 data = fh.read() |
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152 count = len(data) / 4 |
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153 hidden = frozenset(struct.unpack('>%ii' % count, data)) |
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154 return hidden |
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155 except struct.error: |
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156 repo.ui.debug('corrupted hidden cache\n') |
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157 # No need to fix the content as it will get rewritten |
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158 return None |
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159 except (IOError, OSError): |
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160 repo.ui.debug('cannot read hidden cache\n') |
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161 return None |
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162 finally: |
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163 if fh: |
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164 fh.close() |
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165 |
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166 def tryreadcache(repo, hideable): |
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167 """read a cache if the cache exists and is valid, otherwise returns None.""" |
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168 newhash = cachehash(repo, hideable) |
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169 return _readhiddencache(repo, cachefile, newhash) |
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170 |
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171 def computehidden(repo): |
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172 """compute the set of hidden revision to filter |
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173 |
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174 During most operation hidden should be filtered.""" |
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175 assert not repo.changelog.filteredrevs |
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176 |
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177 hidden = frozenset() |
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178 hideable = hideablerevs(repo) |
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179 if hideable: |
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180 cl = repo.changelog |
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181 hidden = tryreadcache(repo, hideable) |
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182 if hidden is None: |
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183 hidden = frozenset(_getstatichidden(repo)) |
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184 trywritehiddencache(repo, hideable, hidden) |
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185 |
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186 # check if we have wd parents, bookmarks or tags pointing to hidden |
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187 # changesets and remove those. |
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188 dynamic = hidden & _getdynamicblockers(repo) |
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189 if dynamic: |
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190 blocked = cl.ancestors(dynamic, inclusive=True) |
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191 hidden = frozenset(r for r in hidden if r not in blocked) |
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192 return hidden |
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193 |
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194 def computeunserved(repo): |
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195 """compute the set of revision that should be filtered when used a server |
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196 |
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197 Secret and hidden changeset should not pretend to be here.""" |
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198 assert not repo.changelog.filteredrevs |
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199 # fast path in simple case to avoid impact of non optimised code |
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200 hiddens = filterrevs(repo, 'visible') |
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201 if phases.hassecret(repo): |
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202 cl = repo.changelog |
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203 secret = phases.secret |
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204 getphase = repo._phasecache.phase |
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205 first = min(cl.rev(n) for n in repo._phasecache.phaseroots[secret]) |
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206 revs = cl.revs(start=first) |
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207 secrets = set(r for r in revs if getphase(repo, r) >= secret) |
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208 return frozenset(hiddens | secrets) |
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209 else: |
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210 return hiddens |
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211 |
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212 def computemutable(repo): |
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213 """compute the set of revision that should be filtered when used a server |
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214 |
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215 Secret and hidden changeset should not pretend to be here.""" |
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216 assert not repo.changelog.filteredrevs |
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217 # fast check to avoid revset call on huge repo |
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218 if any(repo._phasecache.phaseroots[1:]): |
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219 getphase = repo._phasecache.phase |
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220 maymutable = filterrevs(repo, 'base') |
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221 return frozenset(r for r in maymutable if getphase(repo, r)) |
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222 return frozenset() |
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223 |
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224 def computeimpactable(repo): |
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225 """Everything impactable by mutable revision |
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226 |
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227 The immutable filter still have some chance to get invalidated. This will |
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228 happen when: |
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229 |
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230 - you garbage collect hidden changeset, |
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231 - public phase is moved backward, |
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232 - something is changed in the filtering (this could be fixed) |
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233 |
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234 This filter out any mutable changeset and any public changeset that may be |
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235 impacted by something happening to a mutable revision. |
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236 |
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237 This is achieved by filtered everything with a revision number egal or |
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238 higher than the first mutable changeset is filtered.""" |
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239 assert not repo.changelog.filteredrevs |
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240 cl = repo.changelog |
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241 firstmutable = len(cl) |
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242 for roots in repo._phasecache.phaseroots[1:]: |
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243 if roots: |
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244 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) |
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245 # protect from nullrev root |
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246 firstmutable = max(0, firstmutable) |
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247 return frozenset(xrange(firstmutable, len(cl))) |
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248 |
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249 # function to compute filtered set |
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250 # |
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251 # When adding a new filter you MUST update the table at: |
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252 # mercurial.branchmap.subsettable |
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253 # Otherwise your filter will have to recompute all its branches cache |
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254 # from scratch (very slow). |
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255 filtertable = {'visible': computehidden, |
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256 'served': computeunserved, |
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257 'immutable': computemutable, |
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258 'base': computeimpactable} |
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259 |
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260 def filterrevs(repo, filtername): |
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261 """returns set of filtered revision for this filter name""" |
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262 if filtername not in repo.filteredrevcache: |
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263 func = filtertable[filtername] |
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264 repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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265 return repo.filteredrevcache[filtername] |
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266 |
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267 class repoview(object): |
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268 """Provide a read/write view of a repo through a filtered changelog |
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269 |
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270 This object is used to access a filtered version of a repository without |
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271 altering the original repository object itself. We can not alter the |
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272 original object for two main reasons: |
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273 - It prevents the use of a repo with multiple filters at the same time. In |
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274 particular when multiple threads are involved. |
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275 - It makes scope of the filtering harder to control. |
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276 |
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277 This object behaves very closely to the original repository. All attribute |
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278 operations are done on the original repository: |
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279 - An access to `repoview.someattr` actually returns `repo.someattr`, |
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280 - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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281 - A deletion of `repoview.someattr` actually drops `someattr` |
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282 from `repo.__dict__`. |
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283 |
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284 The only exception is the `changelog` property. It is overridden to return |
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285 a (surface) copy of `repo.changelog` with some revisions filtered. The |
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286 `filtername` attribute of the view control the revisions that need to be |
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287 filtered. (the fact the changelog is copied is an implementation detail). |
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288 |
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289 Unlike attributes, this object intercepts all method calls. This means that |
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290 all methods are run on the `repoview` object with the filtered `changelog` |
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291 property. For this purpose the simple `repoview` class must be mixed with |
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292 the actual class of the repository. This ensures that the resulting |
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293 `repoview` object have the very same methods than the repo object. This |
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294 leads to the property below. |
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295 |
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296 repoview.method() --> repo.__class__.method(repoview) |
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297 |
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298 The inheritance has to be done dynamically because `repo` can be of any |
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299 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. |
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300 """ |
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301 |
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302 def __init__(self, repo, filtername): |
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303 object.__setattr__(self, r'_unfilteredrepo', repo) |
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304 object.__setattr__(self, r'filtername', filtername) |
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305 object.__setattr__(self, r'_clcachekey', None) |
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306 object.__setattr__(self, r'_clcache', None) |
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307 |
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308 # not a propertycache on purpose we shall implement a proper cache later |
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309 @property |
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310 def changelog(self): |
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311 """return a filtered version of the changeset |
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312 |
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313 this changelog must not be used for writing""" |
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314 # some cache may be implemented later |
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315 unfi = self._unfilteredrepo |
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316 unfichangelog = unfi.changelog |
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317 # bypass call to changelog.method |
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318 unfiindex = unfichangelog.index |
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319 unfilen = len(unfiindex) - 1 |
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320 unfinode = unfiindex[unfilen - 1][7] |
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321 |
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322 revs = filterrevs(unfi, self.filtername) |
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323 cl = self._clcache |
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324 newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed) |
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325 # if cl.index is not unfiindex, unfi.changelog would be |
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326 # recreated, and our clcache refers to garbage object |
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327 if (cl is not None and |
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328 (cl.index is not unfiindex or newkey != self._clcachekey)): |
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329 cl = None |
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330 # could have been made None by the previous if |
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331 if cl is None: |
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332 cl = copy.copy(unfichangelog) |
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333 cl.filteredrevs = revs |
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334 object.__setattr__(self, r'_clcache', cl) |
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335 object.__setattr__(self, r'_clcachekey', newkey) |
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336 return cl |
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337 |
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338 def unfiltered(self): |
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339 """Return an unfiltered version of a repo""" |
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340 return self._unfilteredrepo |
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341 |
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342 def filtered(self, name): |
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343 """Return a filtered version of a repository""" |
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344 if name == self.filtername: |
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345 return self |
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346 return self.unfiltered().filtered(name) |
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347 |
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348 # everything access are forwarded to the proxied repo |
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349 def __getattr__(self, attr): |
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350 return getattr(self._unfilteredrepo, attr) |
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351 |
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352 def __setattr__(self, attr, value): |
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353 return setattr(self._unfilteredrepo, attr, value) |
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354 |
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355 def __delattr__(self, attr): |
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356 return delattr(self._unfilteredrepo, attr) |
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357 |
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spelling: fix some minor issues found by spell checker
Mads Kiilerich <mads@kiilerich.com>
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358 # The `requirements` attribute is initialized during __init__. But |
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359 # __getattr__ won't be called as it also exists on the class. We need |
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360 # explicit forwarding to main repo here |
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361 @property |
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362 def requirements(self): |
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363 return self._unfilteredrepo.requirements |