annotate mercurial/tags.py @ 9747:85a3285860d3

hg help resolve grossly mischaracterizes the --all switch
author timeless@mozdev.org
date Mon, 26 Oct 2009 02:06:23 +0200
parents e2b1de5fee04
children 25e572394f5c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # tags.py - read tag info from local repository
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2 #
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3 # Copyright 2009 Matt Mackall <mpm@selenic.com>
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4 # Copyright 2009 Greg Ward <greg@gerg.ca>
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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, incorporated herein by reference.
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8
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9 # Currently this module only deals with reading and caching tags.
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10 # Eventually, it could take care of updating (adding/removing/moving)
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11 # tags too.
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12
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13 from node import nullid, bin, hex, short
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14 from i18n import _
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15 import encoding
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16 import error
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17
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18 def _debugalways(ui, *msg):
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19 ui.write(*msg)
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20
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21 def _debugconditional(ui, *msg):
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22 ui.debug(*msg)
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23
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24 def _debugnever(ui, *msg):
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25 pass
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26
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27 _debug = _debugalways
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28 _debug = _debugnever
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29
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30 def findglobaltags1(ui, repo, alltags, tagtypes):
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31 '''Find global tags in repo by reading .hgtags from every head that
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32 has a distinct version of it. Updates the dicts alltags, tagtypes
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33 in place: alltags maps tag name to (node, hist) pair (see _readtags()
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34 below), and tagtypes maps tag name to tag type ('global' in this
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35 case).'''
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36
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37 seen = set()
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38 fctx = None
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39 ctxs = [] # list of filectx
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40 for node in repo.heads():
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41 try:
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42 fnode = repo[node].filenode('.hgtags')
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43 except error.LookupError:
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44 continue
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45 if fnode not in seen:
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46 seen.add(fnode)
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47 if not fctx:
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48 fctx = repo.filectx('.hgtags', fileid=fnode)
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49 else:
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50 fctx = fctx.filectx(fnode)
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51 ctxs.append(fctx)
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52
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53 # read the tags file from each head, ending with the tip
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54 for fctx in reversed(ctxs):
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55 filetags = _readtags(
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56 ui, repo, fctx.data().splitlines(), fctx)
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57 _updatetags(filetags, "global", alltags, tagtypes)
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58
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59 def findglobaltags2(ui, repo, alltags, tagtypes):
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60 '''Same as findglobaltags1(), but with caching.'''
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61 # This is so we can be lazy and assume alltags contains only global
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62 # tags when we pass it to _writetagcache().
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63 assert len(alltags) == len(tagtypes) == 0, \
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64 "findglobaltags() should be called first"
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65
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66 (heads, tagfnode, cachetags, shouldwrite) = _readtagcache(ui, repo)
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67 if cachetags is not None:
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68 assert not shouldwrite
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69 # XXX is this really 100% correct? are there oddball special
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70 # cases where a global tag should outrank a local tag but won't,
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71 # because cachetags does not contain rank info?
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72 _updatetags(cachetags, 'global', alltags, tagtypes)
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73 return
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74
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75 _debug(ui, "reading tags from %d head(s): %s\n"
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76 % (len(heads), map(short, reversed(heads))))
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77 seen = set() # set of fnode
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78 fctx = None
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79 for head in reversed(heads): # oldest to newest
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80 assert head in repo.changelog.nodemap, \
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81 "tag cache returned bogus head %s" % short(head)
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82
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83 fnode = tagfnode.get(head)
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84 if fnode and fnode not in seen:
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85 seen.add(fnode)
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86 if not fctx:
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87 fctx = repo.filectx('.hgtags', fileid=fnode)
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88 else:
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89 fctx = fctx.filectx(fnode)
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90
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91 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx)
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92 _updatetags(filetags, 'global', alltags, tagtypes)
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93
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94 # and update the cache (if necessary)
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95 if shouldwrite:
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96 _writetagcache(ui, repo, heads, tagfnode, alltags)
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97
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98 # Set this to findglobaltags1 to disable tag caching.
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99 findglobaltags = findglobaltags2
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100
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101 def readlocaltags(ui, repo, alltags, tagtypes):
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102 '''Read local tags in repo. Update alltags and tagtypes.'''
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103 try:
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104 # localtags is in the local encoding; re-encode to UTF-8 on
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105 # input for consistency with the rest of this module.
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106 data = repo.opener("localtags").read()
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107 filetags = _readtags(
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108 ui, repo, data.splitlines(), "localtags",
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109 recode=encoding.fromlocal)
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110 _updatetags(filetags, "local", alltags, tagtypes)
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111 except IOError:
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112 pass
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113
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114 def _readtags(ui, repo, lines, fn, recode=None):
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115 '''Read tag definitions from a file (or any source of lines).
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116 Return a mapping from tag name to (node, hist): node is the node id
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117 from the last line read for that name, and hist is the list of node
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118 ids previously associated with it (in file order). All node ids are
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119 binary, not hex.'''
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120
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121 filetags = {} # map tag name to (node, hist)
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122 count = 0
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123
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124 def warn(msg):
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125 ui.warn(_("%s, line %s: %s\n") % (fn, count, msg))
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126
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127 for line in lines:
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128 count += 1
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129 if not line:
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130 continue
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131 try:
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132 (nodehex, name) = line.split(" ", 1)
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133 except ValueError:
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134 warn(_("cannot parse entry"))
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135 continue
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136 name = name.strip()
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137 if recode:
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138 name = recode(name)
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139 try:
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140 nodebin = bin(nodehex)
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141 except TypeError:
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142 warn(_("node '%s' is not well formed") % nodehex)
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143 continue
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144 if nodebin not in repo.changelog.nodemap:
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145 # silently ignore as pull -r might cause this
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146 continue
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147
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148 # update filetags
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149 hist = []
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150 if name in filetags:
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151 n, hist = filetags[name]
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152 hist.append(n)
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153 filetags[name] = (nodebin, hist)
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154 return filetags
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155
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156 def _updatetags(filetags, tagtype, alltags, tagtypes):
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157 '''Incorporate the tag info read from one file into the two
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158 dictionaries, alltags and tagtypes, that contain all tag
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159 info (global across all heads plus local).'''
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160
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161 for name, nodehist in filetags.iteritems():
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162 if name not in alltags:
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163 alltags[name] = nodehist
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164 tagtypes[name] = tagtype
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165 continue
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166
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167 # we prefer alltags[name] if:
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168 # it supercedes us OR
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169 # mutual supercedes and it has a higher rank
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170 # otherwise we win because we're tip-most
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171 anode, ahist = nodehist
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172 bnode, bhist = alltags[name]
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173 if (bnode != anode and anode in bhist and
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174 (bnode not in ahist or len(bhist) > len(ahist))):
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175 anode = bnode
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176 ahist.extend([n for n in bhist if n not in ahist])
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177 alltags[name] = anode, ahist
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178 tagtypes[name] = tagtype
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179
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180
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181 # The tag cache only stores info about heads, not the tag contents
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182 # from each head. I.e. it doesn't try to squeeze out the maximum
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183 # performance, but is simpler has a better chance of actually
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184 # working correctly. And this gives the biggest performance win: it
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185 # avoids looking up .hgtags in the manifest for every head, and it
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186 # can avoid calling heads() at all if there have been no changes to
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187 # the repo.
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188
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189 def _readtagcache(ui, repo):
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190 '''Read the tag cache and return a tuple (heads, fnodes, cachetags,
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191 shouldwrite). If the cache is completely up-to-date, cachetags is a
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192 dict of the form returned by _readtags(); otherwise, it is None and
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193 heads and fnodes are set. In that case, heads is the list of all
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194 heads currently in the repository (ordered from tip to oldest) and
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195 fnodes is a mapping from head to .hgtags filenode. If those two are
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196 set, caller is responsible for reading tag info from each head.'''
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197
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198 try:
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199 cachefile = repo.opener('tags.cache', 'r')
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200 _debug(ui, 'reading tag cache from %s\n' % cachefile.name)
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201 except IOError:
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202 cachefile = None
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203
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204 # The cache file consists of lines like
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205 # <headrev> <headnode> [<tagnode>]
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206 # where <headrev> and <headnode> redundantly identify a repository
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207 # head from the time the cache was written, and <tagnode> is the
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208 # filenode of .hgtags on that head. Heads with no .hgtags file will
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209 # have no <tagnode>. The cache is ordered from tip to oldest (which
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210 # is part of why <headrev> is there: a quick visual check is all
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211 # that's required to ensure correct order).
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212 #
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213 # This information is enough to let us avoid the most expensive part
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214 # of finding global tags, which is looking up <tagnode> in the
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215 # manifest for each head.
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216 cacherevs = [] # list of headrev
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217 cacheheads = [] # list of headnode
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218 cachefnode = {} # map headnode to filenode
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219 if cachefile:
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220 for line in cachefile:
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221 if line == "\n":
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222 break
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223 line = line.rstrip().split()
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224 cacherevs.append(int(line[0]))
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225 headnode = bin(line[1])
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226 cacheheads.append(headnode)
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227 if len(line) == 3:
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228 fnode = bin(line[2])
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229 cachefnode[headnode] = fnode
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230
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231 tipnode = repo.changelog.tip()
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232 tiprev = len(repo.changelog) - 1
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233
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234 # Case 1 (common): tip is the same, so nothing has changed.
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235 # (Unchanged tip trivially means no changesets have been added.
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236 # But, thanks to localrepository.destroyed(), it also means none
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237 # have been destroyed by strip or rollback.)
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238 if cacheheads and cacheheads[0] == tipnode and cacherevs[0] == tiprev:
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239 _debug(ui, "tag cache: tip unchanged\n")
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240 tags = _readtags(ui, repo, cachefile, cachefile.name)
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241 cachefile.close()
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242 return (None, None, tags, False)
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243 if cachefile:
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244 cachefile.close() # ignore rest of file
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245
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246 repoheads = repo.heads()
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247 # Case 2 (uncommon): empty repo; get out quickly and don't bother
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248 # writing an empty cache.
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249 if repoheads == [nullid]:
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250 return ([], {}, {}, False)
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251
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252 # Case 3 (uncommon): cache file missing or empty.
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253 if not cacheheads:
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254 _debug(ui, 'tag cache: cache file missing or empty\n')
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255
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256 # Case 4 (uncommon): tip rev decreased. This should only happen
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257 # when we're called from localrepository.destroyed(). Refresh the
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258 # cache so future invocations will not see disappeared heads in the
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259 # cache.
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260 elif cacheheads and tiprev < cacherevs[0]:
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261 _debug(ui,
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262 'tag cache: tip rev decremented (from %d to %d), '
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263 'so we must be destroying nodes\n'
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264 % (cacherevs[0], tiprev))
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265
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266 # Case 5 (common): tip has changed, so we've added/replaced heads.
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267 else:
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268 _debug(ui,
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269 'tag cache: tip has changed (%d:%s); must find new heads\n'
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270 % (tiprev, short(tipnode)))
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271
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272 # Luckily, the code to handle cases 3, 4, 5 is the same. So the
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273 # above if/elif/else can disappear once we're confident this thing
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274 # actually works and we don't need the debug output.
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275
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276 # N.B. in case 4 (nodes destroyed), "new head" really means "newly
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277 # exposed".
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278 newheads = [head
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279 for head in repoheads
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280 if head not in set(cacheheads)]
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281 _debug(ui, 'tag cache: found %d head(s) not in cache: %s\n'
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282 % (len(newheads), map(short, newheads)))
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283
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284 # Now we have to lookup the .hgtags filenode for every new head.
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285 # This is the most expensive part of finding tags, so performance
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286 # depends primarily on the size of newheads. Worst case: no cache
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287 # file, so newheads == repoheads.
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288 for head in newheads:
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289 cctx = repo[head]
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290 try:
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291 fnode = cctx.filenode('.hgtags')
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292 cachefnode[head] = fnode
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293 except error.LookupError:
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294 # no .hgtags file on this head
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295 pass
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296
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297 # Caller has to iterate over all heads, but can use the filenodes in
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298 # cachefnode to get to each .hgtags revision quickly.
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299 return (repoheads, cachefnode, None, True)
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300
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301 def _writetagcache(ui, repo, heads, tagfnode, cachetags):
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302
9366
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303 try:
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304 cachefile = repo.opener('tags.cache', 'w', atomictemp=True)
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305 except (OSError, IOError):
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306 return
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307 _debug(ui, 'writing cache file %s\n' % cachefile.name)
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308
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309 realheads = repo.heads() # for sanity checks below
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310 for head in heads:
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311 # temporary sanity checks; these can probably be removed
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312 # once this code has been in crew for a few weeks
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313 assert head in repo.changelog.nodemap, \
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314 'trying to write non-existent node %s to tag cache' % short(head)
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315 assert head in realheads, \
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316 'trying to write non-head %s to tag cache' % short(head)
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317 assert head != nullid, \
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318 'trying to write nullid to tag cache'
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319
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320 # This can't fail because of the first assert above. When/if we
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321 # remove that assert, we might want to catch LookupError here
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322 # and downgrade it to a warning.
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323 rev = repo.changelog.rev(head)
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324
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325 fnode = tagfnode.get(head)
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326 if fnode:
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327 cachefile.write('%d %s %s\n' % (rev, hex(head), hex(fnode)))
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328 else:
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329 cachefile.write('%d %s\n' % (rev, hex(head)))
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330
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331 # Tag names in the cache are in UTF-8 -- which is the whole reason
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332 # we keep them in UTF-8 throughout this module. If we converted
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333 # them local encoding on input, we would lose info writing them to
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334 # the cache.
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335 cachefile.write('\n')
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336 for (name, (node, hist)) in cachetags.iteritems():
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337 cachefile.write("%s %s\n" % (hex(node), name))
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338
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339 cachefile.rename()
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340 cachefile.close()