Mercurial > hg
annotate mercurial/tags.py @ 11791:00cde9bddbe4
repair: do not compress partial bundle if we do not keep it on disk
A partial bundle is created to temporarily save revisions > rev but
not descending from the node to strip, to be able to restore the
changesets after stripping the changelog.
Since this bundle is not kept after the strip operation, and is not
user-visible, it is not necessary and should be faster to avoid
compression.
author | Nicolas Dumazet <nicdumz.commits@gmail.com> |
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date | Thu, 12 Aug 2010 16:53:23 +0900 |
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() |