Mercurial > hg
annotate mercurial/branchmap.py @ 32078:bf5e13e38390 stable
pager: use less as a fallback on Unix
This seems reasonable choice per discussion, and the default-default of Git.
See also the inline-comment for why.
https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-April/097042.html
author | Yuya Nishihara <yuya@tcha.org> |
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date | Fri, 28 Apr 2017 20:51:14 +0900 |
parents | a369482e9649 |
children | b98ee1a808bd |
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 scmutil, |
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22 util, |
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23 ) |
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24 |
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25 calcsize = struct.calcsize |
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26 pack_into = struct.pack_into |
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27 unpack_from = struct.unpack_from |
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28 |
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29 def _filename(repo): |
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30 """name of a branchcache file for a given repo or repoview""" |
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31 filename = "cache/branch2" |
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32 if repo.filtername: |
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33 filename = '%s-%s' % (filename, repo.filtername) |
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34 return filename |
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35 |
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36 def read(repo): |
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37 try: |
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38 f = repo.vfs(_filename(repo)) |
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39 lines = f.read().split('\n') |
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40 f.close() |
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41 except (IOError, OSError): |
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42 return None |
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43 |
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44 try: |
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45 cachekey = lines.pop(0).split(" ", 2) |
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46 last, lrev = cachekey[:2] |
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47 last, lrev = bin(last), int(lrev) |
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48 filteredhash = None |
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49 if len(cachekey) > 2: |
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50 filteredhash = bin(cachekey[2]) |
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51 partial = branchcache(tipnode=last, tiprev=lrev, |
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52 filteredhash=filteredhash) |
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53 if not partial.validfor(repo): |
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54 # invalidate the cache |
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55 raise ValueError('tip differs') |
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56 cl = repo.changelog |
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57 for l in lines: |
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58 if not l: |
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59 continue |
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60 node, state, label = l.split(" ", 2) |
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61 if state not in 'oc': |
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62 raise ValueError('invalid branch state') |
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63 label = encoding.tolocal(label.strip()) |
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64 node = bin(node) |
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65 if not cl.hasnode(node): |
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66 raise ValueError('node %s does not exist' % hex(node)) |
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67 partial.setdefault(label, []).append(node) |
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68 if state == 'c': |
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69 partial._closednodes.add(node) |
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70 except KeyboardInterrupt: |
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71 raise |
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72 except Exception as inst: |
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73 if repo.ui.debugflag: |
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74 msg = 'invalid branchheads cache' |
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75 if repo.filtername is not None: |
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76 msg += ' (%s)' % repo.filtername |
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77 msg += ': %s\n' |
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78 repo.ui.debug(msg % inst) |
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79 partial = None |
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80 return partial |
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81 |
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82 ### Nearest subset relation |
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83 # Nearest subset of filter X is a filter Y so that: |
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84 # * Y is included in X, |
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85 # * X - Y is as small as possible. |
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86 # This create and ordering used for branchmap purpose. |
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87 # the ordering may be partial |
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88 subsettable = {None: 'visible', |
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89 'visible': 'served', |
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90 'served': 'immutable', |
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91 'immutable': 'base'} |
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92 |
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93 def updatecache(repo): |
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94 cl = repo.changelog |
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95 filtername = repo.filtername |
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96 partial = repo._branchcaches.get(filtername) |
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97 |
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98 revs = [] |
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99 if partial is None or not partial.validfor(repo): |
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100 partial = read(repo) |
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101 if partial is None: |
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102 subsetname = subsettable.get(filtername) |
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103 if subsetname is None: |
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104 partial = branchcache() |
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105 else: |
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106 subset = repo.filtered(subsetname) |
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107 partial = subset.branchmap().copy() |
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108 extrarevs = subset.changelog.filteredrevs - cl.filteredrevs |
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109 revs.extend(r for r in extrarevs if r <= partial.tiprev) |
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110 revs.extend(cl.revs(start=partial.tiprev + 1)) |
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111 if revs: |
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112 partial.update(repo, revs) |
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113 partial.write(repo) |
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114 |
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115 assert partial.validfor(repo), filtername |
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116 repo._branchcaches[repo.filtername] = partial |
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117 |
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118 def replacecache(repo, bm): |
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119 """Replace the branchmap cache for a repo with a branch mapping. |
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120 |
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121 This is likely only called during clone with a branch map from a remote. |
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122 """ |
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123 rbheads = [] |
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124 closed = [] |
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125 for bheads in bm.itervalues(): |
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126 rbheads.extend(bheads) |
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127 for h in bheads: |
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128 r = repo.changelog.rev(h) |
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129 b, c = repo.changelog.branchinfo(r) |
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130 if c: |
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131 closed.append(h) |
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132 |
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133 if rbheads: |
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134 rtiprev = max((int(repo.changelog.rev(node)) |
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135 for node in rbheads)) |
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136 cache = branchcache(bm, |
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137 repo[rtiprev].node(), |
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138 rtiprev, |
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139 closednodes=closed) |
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140 |
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141 # Try to stick it as low as possible |
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142 # filter above served are unlikely to be fetch from a clone |
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143 for candidate in ('base', 'immutable', 'served'): |
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144 rview = repo.filtered(candidate) |
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145 if cache.validfor(rview): |
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146 repo._branchcaches[candidate] = cache |
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147 cache.write(rview) |
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148 break |
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149 |
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150 class branchcache(dict): |
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151 """A dict like object that hold branches heads cache. |
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152 |
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153 This cache is used to avoid costly computations to determine all the |
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154 branch heads of a repo. |
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155 |
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156 The cache is serialized on disk in the following format: |
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157 |
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158 <tip hex node> <tip rev number> [optional filtered repo hex hash] |
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159 <branch head hex node> <open/closed state> <branch name> |
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160 <branch head hex node> <open/closed state> <branch name> |
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161 ... |
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162 |
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163 The first line is used to check if the cache is still valid. If the |
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164 branch cache is for a filtered repo view, an optional third hash is |
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165 included that hashes the hashes of all filtered revisions. |
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166 |
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167 The open/closed state is represented by a single letter 'o' or 'c'. |
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168 This field can be used to avoid changelog reads when determining if a |
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169 branch head closes a branch or not. |
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170 """ |
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171 |
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172 def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev, |
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173 filteredhash=None, closednodes=None): |
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174 super(branchcache, self).__init__(entries) |
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175 self.tipnode = tipnode |
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176 self.tiprev = tiprev |
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177 self.filteredhash = filteredhash |
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178 # closednodes is a set of nodes that close their branch. If the branch |
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179 # cache has been updated, it may contain nodes that are no longer |
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180 # heads. |
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181 if closednodes is None: |
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182 self._closednodes = set() |
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183 else: |
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184 self._closednodes = closednodes |
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185 |
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186 def validfor(self, repo): |
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187 """Is the cache content valid regarding a repo |
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188 |
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189 - False when cached tipnode is unknown or if we detect a strip. |
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190 - True when cache is up to date or a subset of current repo.""" |
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191 try: |
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192 return ((self.tipnode == repo.changelog.node(self.tiprev)) |
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193 and (self.filteredhash == \ |
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194 scmutil.filteredhash(repo, self.tiprev))) |
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195 except IndexError: |
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196 return False |
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197 |
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198 def _branchtip(self, heads): |
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199 '''Return tuple with last open head in heads and false, |
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200 otherwise return last closed head and true.''' |
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201 tip = heads[-1] |
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202 closed = True |
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203 for h in reversed(heads): |
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204 if h not in self._closednodes: |
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205 tip = h |
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206 closed = False |
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207 break |
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208 return tip, closed |
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209 |
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210 def branchtip(self, branch): |
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211 '''Return the tipmost open head on branch head, otherwise return the |
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212 tipmost closed head on branch. |
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213 Raise KeyError for unknown branch.''' |
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214 return self._branchtip(self[branch])[0] |
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215 |
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216 def branchheads(self, branch, closed=False): |
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217 heads = self[branch] |
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218 if not closed: |
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219 heads = [h for h in heads if h not in self._closednodes] |
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220 return heads |
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221 |
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222 def iterbranches(self): |
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223 for bn, heads in self.iteritems(): |
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224 yield (bn, heads) + self._branchtip(heads) |
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225 |
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226 def copy(self): |
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227 """return an deep copy of the branchcache object""" |
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228 return branchcache(self, self.tipnode, self.tiprev, self.filteredhash, |
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229 self._closednodes) |
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230 |
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231 def write(self, repo): |
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232 try: |
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233 f = repo.vfs(_filename(repo), "w", atomictemp=True) |
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234 cachekey = [hex(self.tipnode), '%d' % self.tiprev] |
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235 if self.filteredhash is not None: |
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236 cachekey.append(hex(self.filteredhash)) |
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237 f.write(" ".join(cachekey) + '\n') |
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238 nodecount = 0 |
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239 for label, nodes in sorted(self.iteritems()): |
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240 for node in nodes: |
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241 nodecount += 1 |
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242 if node in self._closednodes: |
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243 state = 'c' |
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244 else: |
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245 state = 'o' |
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246 f.write("%s %s %s\n" % (hex(node), state, |
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247 encoding.fromlocal(label))) |
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248 f.close() |
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249 repo.ui.log('branchcache', |
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250 'wrote %s branch cache with %d labels and %d nodes\n', |
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251 repo.filtername, len(self), nodecount) |
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252 except (IOError, OSError, error.Abort) as inst: |
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253 repo.ui.debug("couldn't write branch cache: %s\n" % inst) |
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254 # Abort may be raise by read only opener |
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255 pass |
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256 |
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257 def update(self, repo, revgen): |
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258 """Given a branchhead cache, self, that may have extra nodes or be |
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259 missing heads, and a generator of nodes that are strictly a superset of |
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260 heads missing, this function updates self to be correct. |
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261 """ |
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262 starttime = util.timer() |
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263 cl = repo.changelog |
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264 # collect new branch entries |
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265 newbranches = {} |
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266 getbranchinfo = repo.revbranchcache().branchinfo |
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267 for r in revgen: |
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268 branch, closesbranch = getbranchinfo(r) |
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269 newbranches.setdefault(branch, []).append(r) |
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270 if closesbranch: |
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271 self._closednodes.add(cl.node(r)) |
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272 |
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273 # fetch current topological heads to speed up filtering |
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274 topoheads = set(cl.headrevs()) |
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275 |
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276 # if older branchheads are reachable from new ones, they aren't |
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277 # really branchheads. Note checking parents is insufficient: |
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278 # 1 (branch a) -> 2 (branch b) -> 3 (branch a) |
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279 for branch, newheadrevs in newbranches.iteritems(): |
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280 bheads = self.setdefault(branch, []) |
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281 bheadset = set(cl.rev(node) for node in bheads) |
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282 |
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283 # This have been tested True on all internal usage of this function. |
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284 # run it again in case of doubt |
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285 # assert not (set(bheadrevs) & set(newheadrevs)) |
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286 newheadrevs.sort() |
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287 bheadset.update(newheadrevs) |
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288 |
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289 # This prunes out two kinds of heads - heads that are superseded by |
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290 # a head in newheadrevs, and newheadrevs that are not heads because |
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291 # an existing head is their descendant. |
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292 uncertain = bheadset - topoheads |
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293 if uncertain: |
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294 floorrev = min(uncertain) |
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295 ancestors = set(cl.ancestors(newheadrevs, floorrev)) |
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296 bheadset -= ancestors |
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297 bheadrevs = sorted(bheadset) |
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298 self[branch] = [cl.node(rev) for rev in bheadrevs] |
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299 tiprev = bheadrevs[-1] |
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300 if tiprev > self.tiprev: |
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301 self.tipnode = cl.node(tiprev) |
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302 self.tiprev = tiprev |
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303 |
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304 if not self.validfor(repo): |
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305 # cache key are not valid anymore |
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306 self.tipnode = nullid |
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307 self.tiprev = nullrev |
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308 for heads in self.values(): |
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309 tiprev = max(cl.rev(node) for node in heads) |
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310 if tiprev > self.tiprev: |
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311 self.tipnode = cl.node(tiprev) |
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312 self.tiprev = tiprev |
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313 self.filteredhash = scmutil.filteredhash(repo, self.tiprev) |
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314 |
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315 duration = util.timer() - starttime |
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316 repo.ui.log('branchcache', 'updated %s branch cache in %.4f seconds\n', |
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317 repo.filtername, duration) |
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318 |
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319 # Revision branch info cache |
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320 |
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321 _rbcversion = '-v1' |
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322 _rbcnames = 'cache/rbc-names' + _rbcversion |
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323 _rbcrevs = 'cache/rbc-revs' + _rbcversion |
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324 # [4 byte hash prefix][4 byte branch name number with sign bit indicating open] |
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325 _rbcrecfmt = '>4sI' |
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326 _rbcrecsize = calcsize(_rbcrecfmt) |
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327 _rbcnodelen = 4 |
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328 _rbcbranchidxmask = 0x7fffffff |
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329 _rbccloseflag = 0x80000000 |
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330 |
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331 class revbranchcache(object): |
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332 """Persistent cache, mapping from revision number to branch name and close. |
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333 This is a low level cache, independent of filtering. |
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334 |
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335 Branch names are stored in rbc-names in internal encoding separated by 0. |
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336 rbc-names is append-only, and each branch name is only stored once and will |
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337 thus have a unique index. |
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338 |
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339 The branch info for each revision is stored in rbc-revs as constant size |
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340 records. The whole file is read into memory, but it is only 'parsed' on |
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341 demand. The file is usually append-only but will be truncated if repo |
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342 modification is detected. |
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343 The record for each revision contains the first 4 bytes of the |
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344 corresponding node hash, and the record is only used if it still matches. |
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345 Even a completely trashed rbc-revs fill thus still give the right result |
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346 while converging towards full recovery ... assuming no incorrectly matching |
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347 node hashes. |
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348 The record also contains 4 bytes where 31 bits contains the index of the |
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349 branch and the last bit indicate that it is a branch close commit. |
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350 The usage pattern for rbc-revs is thus somewhat similar to 00changelog.i |
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351 and will grow with it but be 1/8th of its size. |
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352 """ |
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353 |
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354 def __init__(self, repo, readonly=True): |
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355 assert repo.filtername is None |
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356 self._repo = repo |
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357 self._names = [] # branch names in local encoding with static index |
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358 self._rbcrevs = bytearray() |
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359 self._rbcsnameslen = 0 # length of names read at _rbcsnameslen |
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360 try: |
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361 bndata = repo.vfs.read(_rbcnames) |
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362 self._rbcsnameslen = len(bndata) # for verification before writing |
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363 if bndata: |
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364 self._names = [encoding.tolocal(bn) |
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365 for bn in bndata.split('\0')] |
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366 except (IOError, OSError): |
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367 if readonly: |
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368 # don't try to use cache - fall back to the slow path |
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369 self.branchinfo = self._branchinfo |
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370 |
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371 if self._names: |
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372 try: |
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373 data = repo.vfs.read(_rbcrevs) |
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374 self._rbcrevs[:] = data |
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375 except (IOError, OSError) as inst: |
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376 repo.ui.debug("couldn't read revision branch cache: %s\n" % |
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377 inst) |
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378 # remember number of good records on disk |
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379 self._rbcrevslen = min(len(self._rbcrevs) // _rbcrecsize, |
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380 len(repo.changelog)) |
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381 if self._rbcrevslen == 0: |
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382 self._names = [] |
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383 self._rbcnamescount = len(self._names) # number of names read at |
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384 # _rbcsnameslen |
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385 self._namesreverse = dict((b, r) for r, b in enumerate(self._names)) |
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386 |
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387 def _clear(self): |
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388 self._rbcsnameslen = 0 |
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389 del self._names[:] |
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390 self._rbcnamescount = 0 |
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391 self._namesreverse.clear() |
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392 self._rbcrevslen = len(self._repo.changelog) |
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393 self._rbcrevs = bytearray(self._rbcrevslen * _rbcrecsize) |
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394 |
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395 def branchinfo(self, rev): |
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396 """Return branch name and close flag for rev, using and updating |
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397 persistent cache.""" |
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398 changelog = self._repo.changelog |
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399 rbcrevidx = rev * _rbcrecsize |
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400 |
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401 # avoid negative index, changelog.read(nullrev) is fast without cache |
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402 if rev == nullrev: |
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403 return changelog.branchinfo(rev) |
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404 |
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405 # if requested rev isn't allocated, grow and cache the rev info |
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406 if len(self._rbcrevs) < rbcrevidx + _rbcrecsize: |
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407 return self._branchinfo(rev) |
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408 |
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409 # fast path: extract data from cache, use it if node is matching |
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410 reponode = changelog.node(rev)[:_rbcnodelen] |
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411 cachenode, branchidx = unpack_from( |
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412 _rbcrecfmt, util.buffer(self._rbcrevs), rbcrevidx) |
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413 close = bool(branchidx & _rbccloseflag) |
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414 if close: |
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415 branchidx &= _rbcbranchidxmask |
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416 if cachenode == '\0\0\0\0': |
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417 pass |
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418 elif cachenode == reponode: |
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419 try: |
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420 return self._names[branchidx], close |
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421 except IndexError: |
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422 # recover from invalid reference to unknown branch |
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423 self._repo.ui.debug("referenced branch names not found" |
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424 " - rebuilding revision branch cache from scratch\n") |
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425 self._clear() |
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426 else: |
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427 # rev/node map has changed, invalidate the cache from here up |
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428 self._repo.ui.debug("history modification detected - truncating " |
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429 "revision branch cache to revision %d\n" % rev) |
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430 truncate = rbcrevidx + _rbcrecsize |
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431 del self._rbcrevs[truncate:] |
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432 self._rbcrevslen = min(self._rbcrevslen, truncate) |
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433 |
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434 # fall back to slow path and make sure it will be written to disk |
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435 return self._branchinfo(rev) |
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436 |
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437 def _branchinfo(self, rev): |
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438 """Retrieve branch info from changelog and update _rbcrevs""" |
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439 changelog = self._repo.changelog |
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440 b, close = changelog.branchinfo(rev) |
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441 if b in self._namesreverse: |
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442 branchidx = self._namesreverse[b] |
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443 else: |
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444 branchidx = len(self._names) |
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445 self._names.append(b) |
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446 self._namesreverse[b] = branchidx |
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447 reponode = changelog.node(rev) |
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448 if close: |
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449 branchidx |= _rbccloseflag |
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450 self._setcachedata(rev, reponode, branchidx) |
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451 return b, close |
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452 |
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453 def _setcachedata(self, rev, node, branchidx): |
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454 """Writes the node's branch data to the in-memory cache data.""" |
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455 if rev == nullrev: |
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456 return |
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457 rbcrevidx = rev * _rbcrecsize |
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458 if len(self._rbcrevs) < rbcrevidx + _rbcrecsize: |
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459 self._rbcrevs.extend('\0' * |
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460 (len(self._repo.changelog) * _rbcrecsize - |
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461 len(self._rbcrevs))) |
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462 pack_into(_rbcrecfmt, self._rbcrevs, rbcrevidx, node, branchidx) |
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463 self._rbcrevslen = min(self._rbcrevslen, rev) |
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464 |
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465 tr = self._repo.currenttransaction() |
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466 if tr: |
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467 tr.addfinalize('write-revbranchcache', self.write) |
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468 |
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469 def write(self, tr=None): |
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470 """Save branch cache if it is dirty.""" |
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471 repo = self._repo |
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472 wlock = None |
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473 step = '' |
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474 try: |
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475 if self._rbcnamescount < len(self._names): |
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476 step = ' names' |
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477 wlock = repo.wlock(wait=False) |
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478 if self._rbcnamescount != 0: |
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479 f = repo.vfs.open(_rbcnames, 'ab') |
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480 if f.tell() == self._rbcsnameslen: |
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481 f.write('\0') |
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482 else: |
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483 f.close() |
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484 repo.ui.debug("%s changed - rewriting it\n" % _rbcnames) |
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485 self._rbcnamescount = 0 |
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486 self._rbcrevslen = 0 |
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487 if self._rbcnamescount == 0: |
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488 # before rewriting names, make sure references are removed |
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489 repo.vfs.unlinkpath(_rbcrevs, ignoremissing=True) |
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490 f = repo.vfs.open(_rbcnames, 'wb') |
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491 f.write('\0'.join(encoding.fromlocal(b) |
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492 for b in self._names[self._rbcnamescount:])) |
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493 self._rbcsnameslen = f.tell() |
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494 f.close() |
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495 self._rbcnamescount = len(self._names) |
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496 |
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497 start = self._rbcrevslen * _rbcrecsize |
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498 if start != len(self._rbcrevs): |
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499 step = '' |
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500 if wlock is None: |
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501 wlock = repo.wlock(wait=False) |
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502 revs = min(len(repo.changelog), |
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503 len(self._rbcrevs) // _rbcrecsize) |
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504 f = repo.vfs.open(_rbcrevs, 'ab') |
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505 if f.tell() != start: |
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506 repo.ui.debug("truncating %s to %d\n" % (_rbcrevs, start)) |
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507 f.seek(start) |
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508 if f.tell() != start: |
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509 start = 0 |
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510 f.seek(start) |
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511 f.truncate() |
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512 end = revs * _rbcrecsize |
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513 f.write(self._rbcrevs[start:end]) |
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514 f.close() |
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515 self._rbcrevslen = revs |
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516 except (IOError, OSError, error.Abort, error.LockError) as inst: |
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517 repo.ui.debug("couldn't write revision branch cache%s: %s\n" |
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518 % (step, inst)) |
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519 finally: |
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520 if wlock is not None: |
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521 wlock.release() |