Mercurial > hg
annotate mercurial/tags.py @ 26361:6b4a0c602bec
merge: fix mergestate comment
author | timeless@mozdev.org |
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date | Fri, 25 Sep 2015 00:54:20 -0400 |
parents | b2f3f185e458 |
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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 __future__ import absolute_import |
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14 |
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15 import array |
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16 import errno |
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17 import time |
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18 |
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19 from .i18n import _ |
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20 from .node import ( |
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21 bin, |
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22 hex, |
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23 nullid, |
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24 short, |
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25 ) |
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26 from . import ( |
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27 encoding, |
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28 error, |
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29 util, |
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30 ) |
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31 |
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32 array = array.array |
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33 |
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34 # Tags computation can be expensive and caches exist to make it fast in |
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35 # the common case. |
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36 # |
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37 # The "hgtagsfnodes1" cache file caches the .hgtags filenode values for |
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38 # each revision in the repository. The file is effectively an array of |
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39 # fixed length records. Read the docs for "hgtagsfnodescache" for technical |
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40 # details. |
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41 # |
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42 # The .hgtags filenode cache grows in proportion to the length of the |
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43 # changelog. The file is truncated when the # changelog is stripped. |
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44 # |
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45 # The purpose of the filenode cache is to avoid the most expensive part |
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46 # of finding global tags, which is looking up the .hgtags filenode in the |
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47 # manifest for each head. This can take dozens or over 100ms for |
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48 # repositories with very large manifests. Multiplied by dozens or even |
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49 # hundreds of heads and there is a significant performance concern. |
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50 # |
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51 # There also exist a separate cache file for each repository filter. |
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52 # These "tags-*" files store information about the history of tags. |
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53 # |
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54 # The tags cache files consists of a cache validation line followed by |
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55 # a history of tags. |
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56 # |
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57 # The cache validation line has the format: |
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58 # |
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59 # <tiprev> <tipnode> [<filteredhash>] |
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60 # |
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61 # <tiprev> is an integer revision and <tipnode> is a 40 character hex |
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62 # node for that changeset. These redundantly identify the repository |
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63 # tip from the time the cache was written. In addition, <filteredhash>, |
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64 # if present, is a 40 character hex hash of the contents of the filtered |
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65 # revisions for this filter. If the set of filtered revs changes, the |
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66 # hash will change and invalidate the cache. |
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67 # |
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68 # The history part of the tags cache consists of lines of the form: |
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69 # |
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70 # <node> <tag> |
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71 # |
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72 # (This format is identical to that of .hgtags files.) |
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73 # |
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74 # <tag> is the tag name and <node> is the 40 character hex changeset |
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75 # the tag is associated with. |
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76 # |
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77 # Tags are written sorted by tag name. |
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78 # |
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79 # Tags associated with multiple changesets have an entry for each changeset. |
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80 # The most recent changeset (in terms of revlog ordering for the head |
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81 # setting it) for each tag is last. |
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82 |
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83 def findglobaltags(ui, repo, alltags, tagtypes): |
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84 '''Find global tags in a repo. |
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85 |
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86 "alltags" maps tag name to (node, hist) 2-tuples. |
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87 |
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88 "tagtypes" maps tag name to tag type. Global tags always have the |
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89 "global" tag type. |
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90 |
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91 The "alltags" and "tagtypes" dicts are updated in place. Empty dicts |
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92 should be passed in. |
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93 |
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94 The tags cache is read and updated as a side-effect of calling. |
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95 ''' |
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96 # This is so we can be lazy and assume alltags contains only global |
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97 # tags when we pass it to _writetagcache(). |
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98 assert len(alltags) == len(tagtypes) == 0, \ |
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99 "findglobaltags() should be called first" |
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100 |
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101 (heads, tagfnode, valid, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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102 if cachetags is not None: |
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103 assert not shouldwrite |
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104 # XXX is this really 100% correct? are there oddball special |
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105 # cases where a global tag should outrank a local tag but won't, |
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106 # because cachetags does not contain rank info? |
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107 _updatetags(cachetags, 'global', alltags, tagtypes) |
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108 return |
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109 |
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110 seen = set() # set of fnode |
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111 fctx = None |
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112 for head in reversed(heads): # oldest to newest |
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113 assert head in repo.changelog.nodemap, \ |
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114 "tag cache returned bogus head %s" % short(head) |
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115 |
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116 fnode = tagfnode.get(head) |
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117 if fnode and fnode not in seen: |
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118 seen.add(fnode) |
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119 if not fctx: |
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120 fctx = repo.filectx('.hgtags', fileid=fnode) |
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121 else: |
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122 fctx = fctx.filectx(fnode) |
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123 |
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124 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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125 _updatetags(filetags, 'global', alltags, tagtypes) |
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126 |
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127 # and update the cache (if necessary) |
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128 if shouldwrite: |
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129 _writetagcache(ui, repo, valid, alltags) |
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130 |
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131 def readlocaltags(ui, repo, alltags, tagtypes): |
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132 '''Read local tags in repo. Update alltags and tagtypes.''' |
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133 try: |
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134 data = repo.vfs.read("localtags") |
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135 except IOError as inst: |
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136 if inst.errno != errno.ENOENT: |
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137 raise |
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138 return |
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139 |
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140 # localtags is in the local encoding; re-encode to UTF-8 on |
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141 # input for consistency with the rest of this module. |
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142 filetags = _readtags( |
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143 ui, repo, data.splitlines(), "localtags", |
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144 recode=encoding.fromlocal) |
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145 |
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146 # remove tags pointing to invalid nodes |
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147 cl = repo.changelog |
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148 for t in filetags.keys(): |
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149 try: |
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150 cl.rev(filetags[t][0]) |
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151 except (LookupError, ValueError): |
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152 del filetags[t] |
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153 |
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154 _updatetags(filetags, "local", alltags, tagtypes) |
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155 |
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156 def _readtaghist(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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157 '''Read tag definitions from a file (or any source of lines). |
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158 |
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159 This function returns two sortdicts with similar information: |
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160 |
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161 - the first dict, bintaghist, contains the tag information as expected by |
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162 the _readtags function, i.e. a mapping from tag name to (node, hist): |
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163 - node is the node id from the last line read for that name, |
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164 - hist is the list of node ids previously associated with it (in file |
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165 order). All node ids are binary, not hex. |
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166 |
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167 - the second dict, hextaglines, is a mapping from tag name to a list of |
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168 [hexnode, line number] pairs, ordered from the oldest to the newest node. |
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169 |
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170 When calcnodelines is False the hextaglines dict is not calculated (an |
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171 empty dict is returned). This is done to improve this function's |
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172 performance in cases where the line numbers are not needed. |
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173 ''' |
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174 |
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175 bintaghist = util.sortdict() |
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176 hextaglines = util.sortdict() |
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177 count = 0 |
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178 |
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179 def warn(msg): |
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180 ui.warn(_("%s, line %s: %s\n") % (fn, count, msg)) |
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181 |
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182 for nline, line in enumerate(lines): |
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183 count += 1 |
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184 if not line: |
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185 continue |
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186 try: |
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187 (nodehex, name) = line.split(" ", 1) |
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188 except ValueError: |
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189 warn(_("cannot parse entry")) |
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190 continue |
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191 name = name.strip() |
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192 if recode: |
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193 name = recode(name) |
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194 try: |
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195 nodebin = bin(nodehex) |
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196 except TypeError: |
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197 warn(_("node '%s' is not well formed") % nodehex) |
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198 continue |
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199 |
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200 # update filetags |
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201 if calcnodelines: |
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202 # map tag name to a list of line numbers |
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203 if name not in hextaglines: |
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204 hextaglines[name] = [] |
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205 hextaglines[name].append([nodehex, nline]) |
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206 continue |
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207 # map tag name to (node, hist) |
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208 if name not in bintaghist: |
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209 bintaghist[name] = [] |
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210 bintaghist[name].append(nodebin) |
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211 return bintaghist, hextaglines |
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212 |
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213 def _readtags(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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214 '''Read tag definitions from a file (or any source of lines). |
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215 |
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216 Returns a mapping from tag name to (node, hist). |
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217 |
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218 "node" is the node id from the last line read for that name. "hist" |
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219 is the list of node ids previously associated with it (in file order). |
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220 All node ids are binary, not hex. |
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221 ''' |
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222 filetags, nodelines = _readtaghist(ui, repo, lines, fn, recode=recode, |
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223 calcnodelines=calcnodelines) |
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224 for tag, taghist in filetags.items(): |
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225 filetags[tag] = (taghist[-1], taghist[:-1]) |
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226 return filetags |
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227 |
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228 def _updatetags(filetags, tagtype, alltags, tagtypes): |
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229 '''Incorporate the tag info read from one file into the two |
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230 dictionaries, alltags and tagtypes, that contain all tag |
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231 info (global across all heads plus local).''' |
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232 |
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233 for name, nodehist in filetags.iteritems(): |
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234 if name not in alltags: |
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235 alltags[name] = nodehist |
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236 tagtypes[name] = tagtype |
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237 continue |
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238 |
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239 # we prefer alltags[name] if: |
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240 # it supersedes us OR |
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241 # mutual supersedes and it has a higher rank |
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242 # otherwise we win because we're tip-most |
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243 anode, ahist = nodehist |
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244 bnode, bhist = alltags[name] |
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245 if (bnode != anode and anode in bhist and |
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246 (bnode not in ahist or len(bhist) > len(ahist))): |
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247 anode = bnode |
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248 else: |
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249 tagtypes[name] = tagtype |
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250 ahist.extend([n for n in bhist if n not in ahist]) |
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251 alltags[name] = anode, ahist |
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252 |
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253 def _filename(repo): |
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254 """name of a tagcache file for a given repo or repoview""" |
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255 filename = 'cache/tags2' |
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256 if repo.filtername: |
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257 filename = '%s-%s' % (filename, repo.filtername) |
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258 return filename |
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259 |
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260 def _readtagcache(ui, repo): |
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261 '''Read the tag cache. |
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262 |
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263 Returns a tuple (heads, fnodes, validinfo, cachetags, shouldwrite). |
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264 |
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265 If the cache is completely up-to-date, "cachetags" is a dict of the |
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266 form returned by _readtags() and "heads", "fnodes", and "validinfo" are |
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267 None and "shouldwrite" is False. |
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268 |
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269 If the cache is not up to date, "cachetags" is None. "heads" is a list |
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270 of all heads currently in the repository, ordered from tip to oldest. |
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271 "validinfo" is a tuple describing cache validation info. This is used |
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272 when writing the tags cache. "fnodes" is a mapping from head to .hgtags |
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273 filenode. "shouldwrite" is True. |
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274 |
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275 If the cache is not up to date, the caller is responsible for reading tag |
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276 info from each returned head. (See findglobaltags().) |
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277 ''' |
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278 from . import scmutil # avoid cycle |
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279 |
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280 try: |
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281 cachefile = repo.vfs(_filename(repo), 'r') |
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282 # force reading the file for static-http |
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283 cachelines = iter(cachefile) |
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284 except IOError: |
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285 cachefile = None |
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286 |
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287 cacherev = None |
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288 cachenode = None |
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289 cachehash = None |
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290 if cachefile: |
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291 try: |
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292 validline = cachelines.next() |
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293 validline = validline.split() |
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294 cacherev = int(validline[0]) |
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295 cachenode = bin(validline[1]) |
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296 if len(validline) > 2: |
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297 cachehash = bin(validline[2]) |
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298 except Exception: |
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299 # corruption of the cache, just recompute it. |
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300 pass |
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301 |
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302 tipnode = repo.changelog.tip() |
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303 tiprev = len(repo.changelog) - 1 |
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304 |
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305 # Case 1 (common): tip is the same, so nothing has changed. |
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306 # (Unchanged tip trivially means no changesets have been added. |
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307 # But, thanks to localrepository.destroyed(), it also means none |
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308 # have been destroyed by strip or rollback.) |
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309 if (cacherev == tiprev |
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310 and cachenode == tipnode |
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311 and cachehash == scmutil.filteredhash(repo, tiprev)): |
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312 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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313 cachefile.close() |
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314 return (None, None, None, tags, False) |
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315 if cachefile: |
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316 cachefile.close() # ignore rest of file |
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317 |
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318 valid = (tiprev, tipnode, scmutil.filteredhash(repo, tiprev)) |
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319 |
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320 repoheads = repo.heads() |
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321 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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322 # writing an empty cache. |
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323 if repoheads == [nullid]: |
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324 return ([], {}, valid, {}, False) |
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325 |
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326 # Case 3 (uncommon): cache file missing or empty. |
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327 |
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328 # Case 4 (uncommon): tip rev decreased. This should only happen |
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329 # when we're called from localrepository.destroyed(). Refresh the |
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330 # cache so future invocations will not see disappeared heads in the |
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331 # cache. |
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332 |
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333 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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334 |
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335 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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336 |
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337 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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338 # exposed". |
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339 if not len(repo.file('.hgtags')): |
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340 # No tags have ever been committed, so we can avoid a |
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341 # potentially expensive search. |
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342 return ([], {}, valid, None, True) |
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343 |
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344 starttime = time.time() |
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345 |
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346 # Now we have to lookup the .hgtags filenode for every new head. |
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347 # This is the most expensive part of finding tags, so performance |
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348 # depends primarily on the size of newheads. Worst case: no cache |
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349 # file, so newheads == repoheads. |
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350 fnodescache = hgtagsfnodescache(repo.unfiltered()) |
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351 cachefnode = {} |
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352 for head in reversed(repoheads): |
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353 fnode = fnodescache.getfnode(head) |
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354 if fnode != nullid: |
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355 cachefnode[head] = fnode |
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356 |
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357 fnodescache.write() |
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358 |
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359 duration = time.time() - starttime |
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360 ui.log('tagscache', |
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361 '%d/%d cache hits/lookups in %0.4f ' |
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362 'seconds\n', |
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363 fnodescache.hitcount, fnodescache.lookupcount, duration) |
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364 |
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365 # Caller has to iterate over all heads, but can use the filenodes in |
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366 # cachefnode to get to each .hgtags revision quickly. |
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367 return (repoheads, cachefnode, valid, None, True) |
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368 |
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369 def _writetagcache(ui, repo, valid, cachetags): |
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370 filename = _filename(repo) |
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371 try: |
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372 cachefile = repo.vfs(filename, 'w', atomictemp=True) |
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373 except (OSError, IOError): |
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374 return |
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375 |
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376 ui.log('tagscache', 'writing .hg/%s with %d tags\n', |
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377 filename, len(cachetags)) |
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378 |
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379 if valid[2]: |
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380 cachefile.write('%d %s %s\n' % (valid[0], hex(valid[1]), hex(valid[2]))) |
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381 else: |
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382 cachefile.write('%d %s\n' % (valid[0], hex(valid[1]))) |
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383 |
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384 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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385 # we keep them in UTF-8 throughout this module. If we converted |
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386 # them local encoding on input, we would lose info writing them to |
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387 # the cache. |
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388 for (name, (node, hist)) in sorted(cachetags.iteritems()): |
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389 for n in hist: |
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390 cachefile.write("%s %s\n" % (hex(n), name)) |
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391 cachefile.write("%s %s\n" % (hex(node), name)) |
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392 |
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393 try: |
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394 cachefile.close() |
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395 except (OSError, IOError): |
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396 pass |
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397 |
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398 _fnodescachefile = 'cache/hgtagsfnodes1' |
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399 _fnodesrecsize = 4 + 20 # changeset fragment + filenode |
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400 _fnodesmissingrec = '\xff' * 24 |
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401 |
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402 class hgtagsfnodescache(object): |
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403 """Persistent cache mapping revisions to .hgtags filenodes. |
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404 |
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405 The cache is an array of records. Each item in the array corresponds to |
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406 a changelog revision. Values in the array contain the first 4 bytes of |
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407 the node hash and the 20 bytes .hgtags filenode for that revision. |
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408 |
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409 The first 4 bytes are present as a form of verification. Repository |
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410 stripping and rewriting may change the node at a numeric revision in the |
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411 changelog. The changeset fragment serves as a verifier to detect |
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412 rewriting. This logic is shared with the rev branch cache (see |
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413 branchmap.py). |
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414 |
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415 The instance holds in memory the full cache content but entries are |
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416 only parsed on read. |
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417 |
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418 Instances behave like lists. ``c[i]`` works where i is a rev or |
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419 changeset node. Missing indexes are populated automatically on access. |
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420 """ |
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421 def __init__(self, repo): |
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422 assert repo.filtername is None |
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423 |
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424 self._repo = repo |
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425 |
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426 # Only for reporting purposes. |
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427 self.lookupcount = 0 |
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428 self.hitcount = 0 |
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429 |
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430 self._raw = array('c') |
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431 |
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432 data = repo.vfs.tryread(_fnodescachefile) |
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433 self._raw.fromstring(data) |
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434 |
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435 # The end state of self._raw is an array that is of the exact length |
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436 # required to hold a record for every revision in the repository. |
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437 # We truncate or extend the array as necessary. self._dirtyoffset is |
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438 # defined to be the start offset at which we need to write the output |
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439 # file. This offset is also adjusted when new entries are calculated |
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440 # for array members. |
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441 cllen = len(repo.changelog) |
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442 wantedlen = cllen * _fnodesrecsize |
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443 rawlen = len(self._raw) |
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444 |
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445 self._dirtyoffset = None |
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446 |
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447 if rawlen < wantedlen: |
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448 self._dirtyoffset = rawlen |
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449 self._raw.extend('\xff' * (wantedlen - rawlen)) |
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450 elif rawlen > wantedlen: |
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451 # There's no easy way to truncate array instances. This seems |
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452 # slightly less evil than copying a potentially large array slice. |
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453 for i in range(rawlen - wantedlen): |
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454 self._raw.pop() |
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455 self._dirtyoffset = len(self._raw) |
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456 |
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457 def getfnode(self, node, computemissing=True): |
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458 """Obtain the filenode of the .hgtags file at a specified revision. |
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459 |
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460 If the value is in the cache, the entry will be validated and returned. |
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461 Otherwise, the filenode will be computed and returned unless |
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462 "computemissing" is False, in which case None will be returned without |
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463 any potentially expensive computation being performed. |
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464 |
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465 If an .hgtags does not exist at the specified revision, nullid is |
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466 returned. |
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467 """ |
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468 ctx = self._repo[node] |
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469 rev = ctx.rev() |
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470 |
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471 self.lookupcount += 1 |
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472 |
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473 offset = rev * _fnodesrecsize |
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474 record = self._raw[offset:offset + _fnodesrecsize].tostring() |
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475 properprefix = node[0:4] |
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476 |
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477 # Validate and return existing entry. |
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478 if record != _fnodesmissingrec: |
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479 fileprefix = record[0:4] |
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480 |
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481 if fileprefix == properprefix: |
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482 self.hitcount += 1 |
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483 return record[4:] |
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484 |
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485 # Fall through. |
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486 |
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487 # If we get here, the entry is either missing or invalid. |
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488 |
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489 if not computemissing: |
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490 return None |
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491 |
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492 # Populate missing entry. |
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493 try: |
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494 fnode = ctx.filenode('.hgtags') |
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495 except error.LookupError: |
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496 # No .hgtags file on this revision. |
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497 fnode = nullid |
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498 |
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499 self._writeentry(offset, properprefix, fnode) |
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500 return fnode |
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501 |
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502 def setfnode(self, node, fnode): |
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503 """Set the .hgtags filenode for a given changeset.""" |
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504 assert len(fnode) == 20 |
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505 ctx = self._repo[node] |
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506 |
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507 # Do a lookup first to avoid writing if nothing has changed. |
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508 if self.getfnode(ctx.node(), computemissing=False) == fnode: |
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509 return |
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510 |
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511 self._writeentry(ctx.rev() * _fnodesrecsize, node[0:4], fnode) |
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512 |
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513 def _writeentry(self, offset, prefix, fnode): |
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514 # Slices on array instances only accept other array. |
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515 entry = array('c', prefix + fnode) |
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516 self._raw[offset:offset + _fnodesrecsize] = entry |
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517 # self._dirtyoffset could be None. |
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518 self._dirtyoffset = min(self._dirtyoffset, offset) or 0 |
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519 |
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520 def write(self): |
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521 """Perform all necessary writes to cache file. |
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522 |
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523 This may no-op if no writes are needed or if a write lock could |
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524 not be obtained. |
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525 """ |
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526 if self._dirtyoffset is None: |
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527 return |
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528 |
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529 data = self._raw[self._dirtyoffset:] |
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530 if not data: |
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531 return |
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532 |
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533 repo = self._repo |
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534 |
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535 try: |
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536 lock = repo.wlock(wait=False) |
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537 except error.LockError: |
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538 repo.ui.log('tagscache', |
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539 'not writing .hg/%s because lock cannot be acquired\n' % |
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540 (_fnodescachefile)) |
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541 return |
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542 |
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543 try: |
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544 f = repo.vfs.open(_fnodescachefile, 'ab') |
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545 try: |
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546 # if the file has been truncated |
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547 actualoffset = f.tell() |
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548 if actualoffset < self._dirtyoffset: |
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549 self._dirtyoffset = actualoffset |
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550 data = self._raw[self._dirtyoffset:] |
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551 f.seek(self._dirtyoffset) |
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552 f.truncate() |
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553 repo.ui.log('tagscache', |
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554 'writing %d bytes to %s\n' % ( |
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555 len(data), _fnodescachefile)) |
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556 f.write(data) |
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557 self._dirtyoffset = None |
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558 finally: |
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559 f.close() |
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560 except (IOError, OSError) as inst: |
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561 repo.ui.log('tagscache', |
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562 "couldn't write %s: %s\n" % ( |
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563 _fnodescachefile, inst)) |
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564 finally: |
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565 lock.release() |