Mercurial > hg
annotate mercurial/tags.py @ 11493:cc4e2a7ca23f
Merge with stable
author | Martin Geisler <mg@aragost.com> |
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date | Fri, 02 Jul 2010 11:30:57 +0200 |
parents | b19067ee4507 |
children | 2d754eae430c |
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 |
10263 | 7 # GNU General Public License version 2 or any later version. |
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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 findglobaltags(ui, repo, alltags, tagtypes): |
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19 '''Find global tags in repo by reading .hgtags from every head that |
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20 has a distinct version of it, using a cache to avoid excess work. |
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21 Updates the dicts alltags, tagtypes in place: alltags maps tag name |
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22 to (node, hist) pair (see _readtags() below), and tagtypes maps tag |
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23 name to tag type ("global" in this case).''' |
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24 # This is so we can be lazy and assume alltags contains only global |
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25 # tags when we pass it to _writetagcache(). |
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26 assert len(alltags) == len(tagtypes) == 0, \ |
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27 "findglobaltags() should be called first" |
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28 |
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29 (heads, tagfnode, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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30 if cachetags is not None: |
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31 assert not shouldwrite |
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32 # XXX is this really 100% correct? are there oddball special |
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33 # cases where a global tag should outrank a local tag but won't, |
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34 # because cachetags does not contain rank info? |
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35 _updatetags(cachetags, 'global', alltags, tagtypes) |
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36 return |
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37 |
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38 seen = set() # set of fnode |
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39 fctx = None |
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40 for head in reversed(heads): # oldest to newest |
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41 assert head in repo.changelog.nodemap, \ |
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42 "tag cache returned bogus head %s" % short(head) |
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43 |
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44 fnode = tagfnode.get(head) |
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45 if fnode and 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 |
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52 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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53 _updatetags(filetags, 'global', alltags, tagtypes) |
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54 |
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55 # and update the cache (if necessary) |
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56 if shouldwrite: |
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57 _writetagcache(ui, repo, heads, tagfnode, alltags) |
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58 |
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59 def readlocaltags(ui, repo, alltags, tagtypes): |
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60 '''Read local tags in repo. Update alltags and tagtypes.''' |
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61 try: |
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62 # localtags is in the local encoding; re-encode to UTF-8 on |
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63 # input for consistency with the rest of this module. |
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64 data = repo.opener("localtags").read() |
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65 filetags = _readtags( |
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66 ui, repo, data.splitlines(), "localtags", |
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67 recode=encoding.fromlocal) |
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68 _updatetags(filetags, "local", alltags, tagtypes) |
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69 except IOError: |
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70 pass |
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71 |
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72 def _readtags(ui, repo, lines, fn, recode=None): |
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73 '''Read tag definitions from a file (or any source of lines). |
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74 Return a mapping from tag name to (node, hist): node is the node id |
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75 from the last line read for that name, and hist is the list of node |
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76 ids previously associated with it (in file order). All node ids are |
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77 binary, not hex.''' |
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78 |
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79 filetags = {} # map tag name to (node, hist) |
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80 count = 0 |
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81 |
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82 def warn(msg): |
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83 ui.warn(_("%s, line %s: %s\n") % (fn, count, msg)) |
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84 |
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85 for line in lines: |
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86 count += 1 |
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87 if not line: |
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88 continue |
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89 try: |
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90 (nodehex, name) = line.split(" ", 1) |
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91 except ValueError: |
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92 warn(_("cannot parse entry")) |
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93 continue |
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94 name = name.strip() |
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95 if recode: |
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96 name = recode(name) |
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97 try: |
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98 nodebin = bin(nodehex) |
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99 except TypeError: |
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100 warn(_("node '%s' is not well formed") % nodehex) |
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101 continue |
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102 if nodebin not in repo.changelog.nodemap: |
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103 # silently ignore as pull -r might cause this |
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104 continue |
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105 |
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106 # update filetags |
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107 hist = [] |
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108 if name in filetags: |
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109 n, hist = filetags[name] |
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110 hist.append(n) |
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111 filetags[name] = (nodebin, hist) |
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112 return filetags |
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113 |
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114 def _updatetags(filetags, tagtype, alltags, tagtypes): |
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115 '''Incorporate the tag info read from one file into the two |
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116 dictionaries, alltags and tagtypes, that contain all tag |
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117 info (global across all heads plus local).''' |
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118 |
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119 for name, nodehist in filetags.iteritems(): |
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120 if name not in alltags: |
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121 alltags[name] = nodehist |
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122 tagtypes[name] = tagtype |
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123 continue |
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124 |
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125 # we prefer alltags[name] if: |
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126 # it supercedes us OR |
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127 # mutual supercedes and it has a higher rank |
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128 # otherwise we win because we're tip-most |
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129 anode, ahist = nodehist |
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130 bnode, bhist = alltags[name] |
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131 if (bnode != anode and anode in bhist and |
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132 (bnode not in ahist or len(bhist) > len(ahist))): |
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133 anode = bnode |
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134 ahist.extend([n for n in bhist if n not in ahist]) |
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135 alltags[name] = anode, ahist |
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136 tagtypes[name] = tagtype |
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137 |
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138 |
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139 # The tag cache only stores info about heads, not the tag contents |
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140 # from each head. I.e. it doesn't try to squeeze out the maximum |
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141 # performance, but is simpler has a better chance of actually |
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142 # working correctly. And this gives the biggest performance win: it |
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143 # avoids looking up .hgtags in the manifest for every head, and it |
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144 # can avoid calling heads() at all if there have been no changes to |
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145 # the repo. |
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146 |
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147 def _readtagcache(ui, repo): |
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148 '''Read the tag cache and return a tuple (heads, fnodes, cachetags, |
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149 shouldwrite). If the cache is completely up-to-date, cachetags is a |
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150 dict of the form returned by _readtags(); otherwise, it is None and |
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151 heads and fnodes are set. In that case, heads is the list of all |
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152 heads currently in the repository (ordered from tip to oldest) and |
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153 fnodes is a mapping from head to .hgtags filenode. If those two are |
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154 set, caller is responsible for reading tag info from each head.''' |
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155 |
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156 try: |
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157 cachefile = repo.opener('tags.cache', 'r') |
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158 # force reading the file for static-http |
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159 cachelines = iter(cachefile) |
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160 except IOError: |
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161 cachefile = None |
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162 |
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163 # The cache file consists of lines like |
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164 # <headrev> <headnode> [<tagnode>] |
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165 # where <headrev> and <headnode> redundantly identify a repository |
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166 # head from the time the cache was written, and <tagnode> is the |
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167 # filenode of .hgtags on that head. Heads with no .hgtags file will |
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168 # have no <tagnode>. The cache is ordered from tip to oldest (which |
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169 # is part of why <headrev> is there: a quick visual check is all |
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170 # that's required to ensure correct order). |
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171 # |
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172 # This information is enough to let us avoid the most expensive part |
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173 # of finding global tags, which is looking up <tagnode> in the |
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174 # manifest for each head. |
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175 cacherevs = [] # list of headrev |
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176 cacheheads = [] # list of headnode |
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177 cachefnode = {} # map headnode to filenode |
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178 if cachefile: |
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179 for line in cachelines: |
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180 if line == "\n": |
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181 break |
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182 line = line.rstrip().split() |
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183 cacherevs.append(int(line[0])) |
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184 headnode = bin(line[1]) |
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185 cacheheads.append(headnode) |
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186 if len(line) == 3: |
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187 fnode = bin(line[2]) |
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188 cachefnode[headnode] = fnode |
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189 |
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190 tipnode = repo.changelog.tip() |
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191 tiprev = len(repo.changelog) - 1 |
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192 |
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193 # Case 1 (common): tip is the same, so nothing has changed. |
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194 # (Unchanged tip trivially means no changesets have been added. |
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195 # But, thanks to localrepository.destroyed(), it also means none |
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196 # have been destroyed by strip or rollback.) |
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197 if cacheheads and cacheheads[0] == tipnode and cacherevs[0] == tiprev: |
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198 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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199 cachefile.close() |
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200 return (None, None, tags, False) |
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201 if cachefile: |
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202 cachefile.close() # ignore rest of file |
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203 |
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204 repoheads = repo.heads() |
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205 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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206 # writing an empty cache. |
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207 if repoheads == [nullid]: |
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208 return ([], {}, {}, False) |
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209 |
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210 # Case 3 (uncommon): cache file missing or empty. |
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211 |
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212 # Case 4 (uncommon): tip rev decreased. This should only happen |
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213 # when we're called from localrepository.destroyed(). Refresh the |
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214 # cache so future invocations will not see disappeared heads in the |
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215 # cache. |
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216 |
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217 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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218 |
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219 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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220 |
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221 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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222 # exposed". |
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223 newheads = [head |
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224 for head in repoheads |
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225 if head not in set(cacheheads)] |
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226 |
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227 # Now we have to lookup the .hgtags filenode for every new head. |
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228 # This is the most expensive part of finding tags, so performance |
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229 # depends primarily on the size of newheads. Worst case: no cache |
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230 # file, so newheads == repoheads. |
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231 for head in newheads: |
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232 cctx = repo[head] |
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233 try: |
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234 fnode = cctx.filenode('.hgtags') |
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235 cachefnode[head] = fnode |
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236 except error.LookupError: |
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237 # no .hgtags file on this head |
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238 pass |
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239 |
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240 # Caller has to iterate over all heads, but can use the filenodes in |
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241 # cachefnode to get to each .hgtags revision quickly. |
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242 return (repoheads, cachefnode, None, True) |
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243 |
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244 def _writetagcache(ui, repo, heads, tagfnode, cachetags): |
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245 |
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246 try: |
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247 cachefile = repo.opener('tags.cache', 'w', atomictemp=True) |
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248 except (OSError, IOError): |
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249 return |
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250 |
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251 realheads = repo.heads() # for sanity checks below |
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252 for head in heads: |
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253 # temporary sanity checks; these can probably be removed |
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254 # once this code has been in crew for a few weeks |
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255 assert head in repo.changelog.nodemap, \ |
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256 'trying to write non-existent node %s to tag cache' % short(head) |
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257 assert head in realheads, \ |
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258 'trying to write non-head %s to tag cache' % short(head) |
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259 assert head != nullid, \ |
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260 'trying to write nullid to tag cache' |
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261 |
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262 # This can't fail because of the first assert above. When/if we |
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263 # remove that assert, we might want to catch LookupError here |
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264 # and downgrade it to a warning. |
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265 rev = repo.changelog.rev(head) |
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266 |
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267 fnode = tagfnode.get(head) |
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268 if fnode: |
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269 cachefile.write('%d %s %s\n' % (rev, hex(head), hex(fnode))) |
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270 else: |
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271 cachefile.write('%d %s\n' % (rev, hex(head))) |
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272 |
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273 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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274 # we keep them in UTF-8 throughout this module. If we converted |
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275 # them local encoding on input, we would lose info writing them to |
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276 # the cache. |
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277 cachefile.write('\n') |
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278 for (name, (node, hist)) in cachetags.iteritems(): |
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279 cachefile.write("%s %s\n" % (hex(node), name)) |
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280 |
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281 cachefile.rename() |