Mercurial > hg
annotate mercurial/tags.py @ 19093:6f27efc7db23 stable
hgweb: fix empty navigation detection
For some obscure reason, changelog.node(0) returns nullid if changelog is empty.
this break empty navigation detection. We fix this code by using the length of
the changelog.
Using the length have some issue with revision filtering but this is a small
step in the right direction. Proper fix comes in later changeset.
author | Pierre-Yves David <pierre-yves.david@logilab.fr> |
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date | Tue, 30 Apr 2013 15:11:12 +0200 |
parents | e7cfe3587ea4 |
children | cb95716da5fe |
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 import errno |
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18 |
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19 def findglobaltags(ui, repo, alltags, tagtypes): |
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20 '''Find global tags in repo by reading .hgtags from every head that |
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21 has a distinct version of it, using a cache to avoid excess work. |
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22 Updates the dicts alltags, tagtypes in place: alltags maps tag name |
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23 to (node, hist) pair (see _readtags() below), and tagtypes maps tag |
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24 name to tag type ("global" in this case).''' |
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25 # This is so we can be lazy and assume alltags contains only global |
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26 # tags when we pass it to _writetagcache(). |
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27 assert len(alltags) == len(tagtypes) == 0, \ |
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28 "findglobaltags() should be called first" |
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29 |
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30 (heads, tagfnode, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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31 if cachetags is not None: |
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32 assert not shouldwrite |
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33 # XXX is this really 100% correct? are there oddball special |
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34 # cases where a global tag should outrank a local tag but won't, |
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35 # because cachetags does not contain rank info? |
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36 _updatetags(cachetags, 'global', alltags, tagtypes) |
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37 return |
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38 |
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39 seen = set() # set of fnode |
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40 fctx = None |
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41 for head in reversed(heads): # oldest to newest |
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42 assert head in repo.changelog.nodemap, \ |
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43 "tag cache returned bogus head %s" % short(head) |
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44 |
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45 fnode = tagfnode.get(head) |
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46 if fnode and fnode not in seen: |
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47 seen.add(fnode) |
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48 if not fctx: |
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49 fctx = repo.filectx('.hgtags', fileid=fnode) |
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50 else: |
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51 fctx = fctx.filectx(fnode) |
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52 |
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53 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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54 _updatetags(filetags, 'global', alltags, tagtypes) |
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55 |
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56 # and update the cache (if necessary) |
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57 if shouldwrite: |
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58 _writetagcache(ui, repo, heads, tagfnode, alltags) |
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59 |
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60 def readlocaltags(ui, repo, alltags, tagtypes): |
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61 '''Read local tags in repo. Update alltags and tagtypes.''' |
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62 try: |
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63 data = repo.opener.read("localtags") |
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64 except IOError, inst: |
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65 if inst.errno != errno.ENOENT: |
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66 raise |
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67 return |
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68 |
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69 # localtags is in the local encoding; re-encode to UTF-8 on |
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70 # input for consistency with the rest of this module. |
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71 filetags = _readtags( |
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72 ui, repo, data.splitlines(), "localtags", |
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73 recode=encoding.fromlocal) |
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74 _updatetags(filetags, "local", alltags, tagtypes) |
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75 |
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76 def _readtags(ui, repo, lines, fn, recode=None): |
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77 '''Read tag definitions from a file (or any source of lines). |
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78 Return a mapping from tag name to (node, hist): node is the node id |
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79 from the last line read for that name, and hist is the list of node |
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80 ids previously associated with it (in file order). All node ids are |
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81 binary, not hex.''' |
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82 |
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83 filetags = {} # map tag name to (node, hist) |
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84 count = 0 |
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85 |
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86 def warn(msg): |
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87 ui.warn(_("%s, line %s: %s\n") % (fn, count, msg)) |
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88 |
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89 for line in lines: |
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90 count += 1 |
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91 if not line: |
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92 continue |
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93 try: |
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94 (nodehex, name) = line.split(" ", 1) |
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95 except ValueError: |
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96 warn(_("cannot parse entry")) |
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97 continue |
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98 name = name.strip() |
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99 if recode: |
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100 name = recode(name) |
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101 try: |
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102 nodebin = bin(nodehex) |
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103 except TypeError: |
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104 warn(_("node '%s' is not well formed") % nodehex) |
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105 continue |
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106 |
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107 # update filetags |
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108 hist = [] |
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109 if name in filetags: |
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110 n, hist = filetags[name] |
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111 hist.append(n) |
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112 filetags[name] = (nodebin, hist) |
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113 return filetags |
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114 |
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115 def _updatetags(filetags, tagtype, alltags, tagtypes): |
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116 '''Incorporate the tag info read from one file into the two |
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117 dictionaries, alltags and tagtypes, that contain all tag |
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118 info (global across all heads plus local).''' |
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119 |
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120 for name, nodehist in filetags.iteritems(): |
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121 if name not in alltags: |
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122 alltags[name] = nodehist |
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123 tagtypes[name] = tagtype |
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124 continue |
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125 |
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126 # we prefer alltags[name] if: |
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127 # it supersedes us OR |
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128 # mutual supersedes and it has a higher rank |
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129 # otherwise we win because we're tip-most |
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130 anode, ahist = nodehist |
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131 bnode, bhist = alltags[name] |
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132 if (bnode != anode and anode in bhist and |
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133 (bnode not in ahist or len(bhist) > len(ahist))): |
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134 anode = bnode |
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135 ahist.extend([n for n in bhist if n not in ahist]) |
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136 alltags[name] = anode, ahist |
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137 tagtypes[name] = tagtype |
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138 |
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139 |
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140 # The tag cache only stores info about heads, not the tag contents |
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141 # from each head. I.e. it doesn't try to squeeze out the maximum |
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142 # performance, but is simpler has a better chance of actually |
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143 # working correctly. And this gives the biggest performance win: it |
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144 # avoids looking up .hgtags in the manifest for every head, and it |
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145 # can avoid calling heads() at all if there have been no changes to |
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146 # the repo. |
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147 |
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148 def _readtagcache(ui, repo): |
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149 '''Read the tag cache and return a tuple (heads, fnodes, cachetags, |
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150 shouldwrite). If the cache is completely up-to-date, cachetags is a |
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151 dict of the form returned by _readtags(); otherwise, it is None and |
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152 heads and fnodes are set. In that case, heads is the list of all |
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153 heads currently in the repository (ordered from tip to oldest) and |
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154 fnodes is a mapping from head to .hgtags filenode. If those two are |
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155 set, caller is responsible for reading tag info from each head.''' |
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156 |
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157 try: |
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158 cachefile = repo.opener('cache/tags', 'r') |
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159 # force reading the file for static-http |
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160 cachelines = iter(cachefile) |
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161 except IOError: |
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162 cachefile = None |
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163 |
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164 # The cache file consists of lines like |
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165 # <headrev> <headnode> [<tagnode>] |
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166 # where <headrev> and <headnode> redundantly identify a repository |
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167 # head from the time the cache was written, and <tagnode> is the |
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168 # filenode of .hgtags on that head. Heads with no .hgtags file will |
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169 # have no <tagnode>. The cache is ordered from tip to oldest (which |
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170 # is part of why <headrev> is there: a quick visual check is all |
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171 # that's required to ensure correct order). |
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172 # |
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173 # This information is enough to let us avoid the most expensive part |
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174 # of finding global tags, which is looking up <tagnode> in the |
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175 # manifest for each head. |
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176 cacherevs = [] # list of headrev |
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177 cacheheads = [] # list of headnode |
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178 cachefnode = {} # map headnode to filenode |
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179 if cachefile: |
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180 try: |
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181 for line in cachelines: |
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182 if line == "\n": |
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183 break |
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184 line = line.split() |
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185 cacherevs.append(int(line[0])) |
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186 headnode = bin(line[1]) |
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187 cacheheads.append(headnode) |
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188 if len(line) == 3: |
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189 fnode = bin(line[2]) |
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190 cachefnode[headnode] = fnode |
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191 except Exception: |
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192 # corruption of the tags cache, just recompute it |
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193 ui.warn(_('.hg/cache/tags is corrupt, rebuilding it\n')) |
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194 cacheheads = [] |
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195 cacherevs = [] |
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196 cachefnode = {} |
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197 |
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198 tipnode = repo.changelog.tip() |
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199 tiprev = len(repo.changelog) - 1 |
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200 |
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201 # Case 1 (common): tip is the same, so nothing has changed. |
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202 # (Unchanged tip trivially means no changesets have been added. |
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203 # But, thanks to localrepository.destroyed(), it also means none |
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204 # have been destroyed by strip or rollback.) |
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205 if cacheheads and cacheheads[0] == tipnode and cacherevs[0] == tiprev: |
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206 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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207 cachefile.close() |
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208 return (None, None, tags, False) |
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209 if cachefile: |
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210 cachefile.close() # ignore rest of file |
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211 |
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212 repoheads = repo.heads() |
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213 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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214 # writing an empty cache. |
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215 if repoheads == [nullid]: |
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216 return ([], {}, {}, False) |
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217 |
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218 # Case 3 (uncommon): cache file missing or empty. |
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219 |
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220 # Case 4 (uncommon): tip rev decreased. This should only happen |
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221 # when we're called from localrepository.destroyed(). Refresh the |
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222 # cache so future invocations will not see disappeared heads in the |
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223 # cache. |
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224 |
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225 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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226 |
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227 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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228 |
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229 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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230 # exposed". |
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231 if not len(repo.file('.hgtags')): |
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232 # No tags have ever been committed, so we can avoid a |
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233 # potentially expensive search. |
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234 return (repoheads, cachefnode, None, True) |
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235 |
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236 newheads = [head |
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237 for head in repoheads |
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238 if head not in set(cacheheads)] |
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239 |
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240 # Now we have to lookup the .hgtags filenode for every new head. |
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241 # This is the most expensive part of finding tags, so performance |
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242 # depends primarily on the size of newheads. Worst case: no cache |
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243 # file, so newheads == repoheads. |
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244 for head in reversed(newheads): |
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245 cctx = repo[head] |
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246 try: |
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247 fnode = cctx.filenode('.hgtags') |
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248 cachefnode[head] = fnode |
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249 except error.LookupError: |
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250 # no .hgtags file on this head |
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251 pass |
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252 |
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253 # Caller has to iterate over all heads, but can use the filenodes in |
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254 # cachefnode to get to each .hgtags revision quickly. |
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255 return (repoheads, cachefnode, None, True) |
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256 |
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257 def _writetagcache(ui, repo, heads, tagfnode, cachetags): |
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258 |
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259 try: |
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260 cachefile = repo.opener('cache/tags', 'w', atomictemp=True) |
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261 except (OSError, IOError): |
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262 return |
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263 |
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264 realheads = repo.heads() # for sanity checks below |
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265 for head in heads: |
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266 # temporary sanity checks; these can probably be removed |
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267 # once this code has been in crew for a few weeks |
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268 assert head in repo.changelog.nodemap, \ |
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269 'trying to write non-existent node %s to tag cache' % short(head) |
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270 assert head in realheads, \ |
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271 'trying to write non-head %s to tag cache' % short(head) |
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272 assert head != nullid, \ |
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273 'trying to write nullid to tag cache' |
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274 |
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275 # This can't fail because of the first assert above. When/if we |
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276 # remove that assert, we might want to catch LookupError here |
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277 # and downgrade it to a warning. |
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278 rev = repo.changelog.rev(head) |
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279 |
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280 fnode = tagfnode.get(head) |
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281 if fnode: |
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282 cachefile.write('%d %s %s\n' % (rev, hex(head), hex(fnode))) |
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283 else: |
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284 cachefile.write('%d %s\n' % (rev, hex(head))) |
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285 |
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286 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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287 # we keep them in UTF-8 throughout this module. If we converted |
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288 # them local encoding on input, we would lose info writing them to |
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289 # the cache. |
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290 cachefile.write('\n') |
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291 for (name, (node, hist)) in cachetags.iteritems(): |
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292 cachefile.write("%s %s\n" % (hex(node), name)) |
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293 |
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294 try: |
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295 cachefile.close() |
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296 except (OSError, IOError): |
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297 pass |