Mercurial > hg
annotate mercurial/tags.py @ 25245:504ef9c49f4a
util: allow to specify buffer size in popen4
We will need unbuffered IO to restore real time output with ssh peer.
Changeset ec171737aaf1 seems to indicate playing with this value could be
dangerous, but does not indicate why.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Wed, 20 May 2015 11:29:45 -0500 |
parents | 559f24e3957d |
children | eaa456c5e699 |
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 util |
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16 import encoding |
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17 import error |
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18 from array import array |
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19 import errno |
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20 import time |
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21 |
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22 # Tags computation can be expensive and caches exist to make it fast in |
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23 # the common case. |
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24 # |
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25 # The "hgtagsfnodes1" cache file caches the .hgtags filenode values for |
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26 # each revision in the repository. The file is effectively an array of |
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27 # fixed length records. Read the docs for "hgtagsfnodescache" for technical |
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28 # details. |
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29 # |
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30 # The .hgtags filenode cache grows in proportion to the length of the |
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31 # changelog. The file is truncated when the # changelog is stripped. |
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32 # |
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33 # The purpose of the filenode cache is to avoid the most expensive part |
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34 # of finding global tags, which is looking up the .hgtags filenode in the |
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35 # manifest for each head. This can take dozens or over 100ms for |
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36 # repositories with very large manifests. Multiplied by dozens or even |
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37 # hundreds of heads and there is a significant performance concern. |
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38 # |
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39 # There also exist a separate cache file for each repository filter. |
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40 # These "tags-*" files store information about the history of tags. |
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41 # |
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42 # The tags cache files consists of a cache validation line followed by |
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43 # a history of tags. |
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44 # |
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45 # The cache validation line has the format: |
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46 # |
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47 # <tiprev> <tipnode> [<filteredhash>] |
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48 # |
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49 # <tiprev> is an integer revision and <tipnode> is a 40 character hex |
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50 # node for that changeset. These redundantly identify the repository |
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51 # tip from the time the cache was written. In addition, <filteredhash>, |
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52 # if present, is a 40 character hex hash of the contents of the filtered |
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53 # revisions for this filter. If the set of filtered revs changes, the |
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54 # hash will change and invalidate the cache. |
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55 # |
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56 # The history part of the tags cache consists of lines of the form: |
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57 # |
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58 # <node> <tag> |
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59 # |
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60 # (This format is identical to that of .hgtags files.) |
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61 # |
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62 # <tag> is the tag name and <node> is the 40 character hex changeset |
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63 # the tag is associated with. |
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64 # |
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65 # Tags are written sorted by tag name. |
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66 # |
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67 # Tags associated with multiple changesets have an entry for each changeset. |
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68 # The most recent changeset (in terms of revlog ordering for the head |
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69 # setting it) for each tag is last. |
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70 |
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71 def findglobaltags(ui, repo, alltags, tagtypes): |
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72 '''Find global tags in a repo. |
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73 |
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74 "alltags" maps tag name to (node, hist) 2-tuples. |
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75 |
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76 "tagtypes" maps tag name to tag type. Global tags always have the |
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77 "global" tag type. |
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78 |
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79 The "alltags" and "tagtypes" dicts are updated in place. Empty dicts |
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80 should be passed in. |
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81 |
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82 The tags cache is read and updated as a side-effect of calling. |
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83 ''' |
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84 # This is so we can be lazy and assume alltags contains only global |
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85 # tags when we pass it to _writetagcache(). |
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86 assert len(alltags) == len(tagtypes) == 0, \ |
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87 "findglobaltags() should be called first" |
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88 |
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89 (heads, tagfnode, valid, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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90 if cachetags is not None: |
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91 assert not shouldwrite |
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92 # XXX is this really 100% correct? are there oddball special |
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93 # cases where a global tag should outrank a local tag but won't, |
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94 # because cachetags does not contain rank info? |
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95 _updatetags(cachetags, 'global', alltags, tagtypes) |
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96 return |
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97 |
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98 seen = set() # set of fnode |
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99 fctx = None |
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100 for head in reversed(heads): # oldest to newest |
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101 assert head in repo.changelog.nodemap, \ |
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102 "tag cache returned bogus head %s" % short(head) |
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103 |
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104 fnode = tagfnode.get(head) |
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105 if fnode and fnode not in seen: |
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106 seen.add(fnode) |
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107 if not fctx: |
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108 fctx = repo.filectx('.hgtags', fileid=fnode) |
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109 else: |
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110 fctx = fctx.filectx(fnode) |
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111 |
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112 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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113 _updatetags(filetags, 'global', alltags, tagtypes) |
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114 |
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115 # and update the cache (if necessary) |
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116 if shouldwrite: |
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117 _writetagcache(ui, repo, valid, alltags) |
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118 |
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119 def readlocaltags(ui, repo, alltags, tagtypes): |
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120 '''Read local tags in repo. Update alltags and tagtypes.''' |
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121 try: |
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122 data = repo.vfs.read("localtags") |
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123 except IOError, inst: |
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124 if inst.errno != errno.ENOENT: |
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125 raise |
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126 return |
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127 |
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128 # localtags is in the local encoding; re-encode to UTF-8 on |
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129 # input for consistency with the rest of this module. |
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130 filetags = _readtags( |
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131 ui, repo, data.splitlines(), "localtags", |
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132 recode=encoding.fromlocal) |
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133 |
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134 # remove tags pointing to invalid nodes |
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135 cl = repo.changelog |
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136 for t in filetags.keys(): |
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137 try: |
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138 cl.rev(filetags[t][0]) |
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139 except (LookupError, ValueError): |
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140 del filetags[t] |
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141 |
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142 _updatetags(filetags, "local", alltags, tagtypes) |
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143 |
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144 def _readtaghist(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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145 '''Read tag definitions from a file (or any source of lines). |
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146 |
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147 This function returns two sortdicts with similar information: |
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148 |
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149 - the first dict, bintaghist, contains the tag information as expected by |
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150 the _readtags function, i.e. a mapping from tag name to (node, hist): |
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151 - node is the node id from the last line read for that name, |
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152 - hist is the list of node ids previously associated with it (in file |
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153 order). All node ids are binary, not hex. |
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154 |
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155 - the second dict, hextaglines, is a mapping from tag name to a list of |
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156 [hexnode, line number] pairs, ordered from the oldest to the newest node. |
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157 |
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158 When calcnodelines is False the hextaglines dict is not calculated (an |
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159 empty dict is returned). This is done to improve this function's |
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160 performance in cases where the line numbers are not needed. |
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161 ''' |
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162 |
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163 bintaghist = util.sortdict() |
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164 hextaglines = util.sortdict() |
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165 count = 0 |
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166 |
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167 def warn(msg): |
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168 ui.warn(_("%s, line %s: %s\n") % (fn, count, msg)) |
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169 |
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170 for nline, line in enumerate(lines): |
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171 count += 1 |
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172 if not line: |
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173 continue |
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174 try: |
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175 (nodehex, name) = line.split(" ", 1) |
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176 except ValueError: |
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177 warn(_("cannot parse entry")) |
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178 continue |
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179 name = name.strip() |
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180 if recode: |
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181 name = recode(name) |
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182 try: |
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183 nodebin = bin(nodehex) |
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184 except TypeError: |
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185 warn(_("node '%s' is not well formed") % nodehex) |
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186 continue |
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187 |
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188 # update filetags |
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189 if calcnodelines: |
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190 # map tag name to a list of line numbers |
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191 if name not in hextaglines: |
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192 hextaglines[name] = [] |
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193 hextaglines[name].append([nodehex, nline]) |
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194 continue |
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195 # map tag name to (node, hist) |
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196 if name not in bintaghist: |
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197 bintaghist[name] = [] |
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198 bintaghist[name].append(nodebin) |
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199 return bintaghist, hextaglines |
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200 |
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201 def _readtags(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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202 '''Read tag definitions from a file (or any source of lines). |
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203 |
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204 Returns a mapping from tag name to (node, hist). |
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205 |
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206 "node" is the node id from the last line read for that name. "hist" |
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207 is the list of node ids previously associated with it (in file order). |
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208 All node ids are binary, not hex. |
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209 ''' |
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210 filetags, nodelines = _readtaghist(ui, repo, lines, fn, recode=recode, |
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211 calcnodelines=calcnodelines) |
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212 for tag, taghist in filetags.items(): |
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213 filetags[tag] = (taghist[-1], taghist[:-1]) |
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214 return filetags |
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215 |
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216 def _updatetags(filetags, tagtype, alltags, tagtypes): |
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217 '''Incorporate the tag info read from one file into the two |
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218 dictionaries, alltags and tagtypes, that contain all tag |
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219 info (global across all heads plus local).''' |
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220 |
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221 for name, nodehist in filetags.iteritems(): |
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222 if name not in alltags: |
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223 alltags[name] = nodehist |
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224 tagtypes[name] = tagtype |
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225 continue |
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226 |
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227 # we prefer alltags[name] if: |
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228 # it supersedes us OR |
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229 # mutual supersedes and it has a higher rank |
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230 # otherwise we win because we're tip-most |
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231 anode, ahist = nodehist |
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232 bnode, bhist = alltags[name] |
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233 if (bnode != anode and anode in bhist and |
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234 (bnode not in ahist or len(bhist) > len(ahist))): |
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235 anode = bnode |
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236 else: |
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237 tagtypes[name] = tagtype |
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238 ahist.extend([n for n in bhist if n not in ahist]) |
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239 alltags[name] = anode, ahist |
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240 |
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241 def _filename(repo): |
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242 """name of a tagcache file for a given repo or repoview""" |
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243 filename = 'cache/tags2' |
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244 if repo.filtername: |
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245 filename = '%s-%s' % (filename, repo.filtername) |
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246 return filename |
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247 |
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248 def _readtagcache(ui, repo): |
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249 '''Read the tag cache. |
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250 |
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251 Returns a tuple (heads, fnodes, validinfo, cachetags, shouldwrite). |
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252 |
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253 If the cache is completely up-to-date, "cachetags" is a dict of the |
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254 form returned by _readtags() and "heads", "fnodes", and "validinfo" are |
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255 None and "shouldwrite" is False. |
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256 |
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257 If the cache is not up to date, "cachetags" is None. "heads" is a list |
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258 of all heads currently in the repository, ordered from tip to oldest. |
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259 "validinfo" is a tuple describing cache validation info. This is used |
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260 when writing the tags cache. "fnodes" is a mapping from head to .hgtags |
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261 filenode. "shouldwrite" is True. |
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262 |
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263 If the cache is not up to date, the caller is responsible for reading tag |
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264 info from each returned head. (See findglobaltags().) |
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265 ''' |
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266 import scmutil # avoid cycle |
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267 |
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268 try: |
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269 cachefile = repo.vfs(_filename(repo), 'r') |
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270 # force reading the file for static-http |
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271 cachelines = iter(cachefile) |
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272 except IOError: |
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273 cachefile = None |
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274 |
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275 cacherev = None |
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276 cachenode = None |
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277 cachehash = None |
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278 if cachefile: |
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279 try: |
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280 validline = cachelines.next() |
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281 validline = validline.split() |
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282 cacherev = int(validline[0]) |
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283 cachenode = bin(validline[1]) |
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284 if len(validline) > 2: |
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285 cachehash = bin(validline[2]) |
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286 except Exception: |
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287 # corruption of the cache, just recompute it. |
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288 pass |
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289 |
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290 tipnode = repo.changelog.tip() |
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291 tiprev = len(repo.changelog) - 1 |
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292 |
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293 # Case 1 (common): tip is the same, so nothing has changed. |
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294 # (Unchanged tip trivially means no changesets have been added. |
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295 # But, thanks to localrepository.destroyed(), it also means none |
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296 # have been destroyed by strip or rollback.) |
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297 if (cacherev == tiprev |
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298 and cachenode == tipnode |
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299 and cachehash == scmutil.filteredhash(repo, tiprev)): |
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300 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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301 cachefile.close() |
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302 return (None, None, None, tags, False) |
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303 if cachefile: |
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304 cachefile.close() # ignore rest of file |
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305 |
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306 valid = (tiprev, tipnode, scmutil.filteredhash(repo, tiprev)) |
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307 |
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308 repoheads = repo.heads() |
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309 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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310 # writing an empty cache. |
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311 if repoheads == [nullid]: |
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312 return ([], {}, valid, {}, False) |
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313 |
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314 # Case 3 (uncommon): cache file missing or empty. |
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315 |
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316 # Case 4 (uncommon): tip rev decreased. This should only happen |
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317 # when we're called from localrepository.destroyed(). Refresh the |
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318 # cache so future invocations will not see disappeared heads in the |
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319 # cache. |
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320 |
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321 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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322 |
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323 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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324 |
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325 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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326 # exposed". |
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327 if not len(repo.file('.hgtags')): |
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328 # No tags have ever been committed, so we can avoid a |
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329 # potentially expensive search. |
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330 return ([], {}, valid, None, True) |
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331 |
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332 starttime = time.time() |
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333 |
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334 # Now we have to lookup the .hgtags filenode for every new head. |
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335 # This is the most expensive part of finding tags, so performance |
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336 # depends primarily on the size of newheads. Worst case: no cache |
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337 # file, so newheads == repoheads. |
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338 fnodescache = hgtagsfnodescache(repo.unfiltered()) |
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339 cachefnode = {} |
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340 for head in reversed(repoheads): |
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341 fnode = fnodescache.getfnode(head) |
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342 if fnode != nullid: |
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343 cachefnode[head] = fnode |
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344 |
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345 fnodescache.write() |
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346 |
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347 duration = time.time() - starttime |
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348 ui.log('tagscache', |
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349 '%d/%d cache hits/lookups in %0.4f ' |
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350 'seconds\n', |
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351 fnodescache.hitcount, fnodescache.lookupcount, duration) |
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352 |
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353 # Caller has to iterate over all heads, but can use the filenodes in |
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354 # cachefnode to get to each .hgtags revision quickly. |
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355 return (repoheads, cachefnode, valid, None, True) |
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356 |
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357 def _writetagcache(ui, repo, valid, cachetags): |
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358 filename = _filename(repo) |
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359 try: |
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360 cachefile = repo.vfs(filename, 'w', atomictemp=True) |
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361 except (OSError, IOError): |
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362 return |
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363 |
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364 ui.log('tagscache', 'writing .hg/%s with %d tags\n', |
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365 filename, len(cachetags)) |
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366 |
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367 if valid[2]: |
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368 cachefile.write('%d %s %s\n' % (valid[0], hex(valid[1]), hex(valid[2]))) |
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369 else: |
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370 cachefile.write('%d %s\n' % (valid[0], hex(valid[1]))) |
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371 |
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372 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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373 # we keep them in UTF-8 throughout this module. If we converted |
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374 # them local encoding on input, we would lose info writing them to |
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375 # the cache. |
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376 for (name, (node, hist)) in sorted(cachetags.iteritems()): |
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377 for n in hist: |
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378 cachefile.write("%s %s\n" % (hex(n), name)) |
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379 cachefile.write("%s %s\n" % (hex(node), name)) |
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380 |
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381 try: |
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382 cachefile.close() |
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383 except (OSError, IOError): |
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384 pass |
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385 |
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386 _fnodescachefile = 'cache/hgtagsfnodes1' |
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387 _fnodesrecsize = 4 + 20 # changeset fragment + filenode |
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388 _fnodesmissingrec = '\xff' * 24 |
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389 |
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390 class hgtagsfnodescache(object): |
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391 """Persistent cache mapping revisions to .hgtags filenodes. |
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392 |
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393 The cache is an array of records. Each item in the array corresponds to |
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394 a changelog revision. Values in the array contain the first 4 bytes of |
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395 the node hash and the 20 bytes .hgtags filenode for that revision. |
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396 |
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397 The first 4 bytes are present as a form of verification. Repository |
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398 stripping and rewriting may change the node at a numeric revision in the |
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399 changelog. The changeset fragment serves as a verifier to detect |
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400 rewriting. This logic is shared with the rev branch cache (see |
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401 branchmap.py). |
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402 |
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403 The instance holds in memory the full cache content but entries are |
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404 only parsed on read. |
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405 |
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406 Instances behave like lists. ``c[i]`` works where i is a rev or |
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407 changeset node. Missing indexes are populated automatically on access. |
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408 """ |
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409 def __init__(self, repo): |
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410 assert repo.filtername is None |
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411 |
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412 self._repo = repo |
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413 |
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414 # Only for reporting purposes. |
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415 self.lookupcount = 0 |
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416 self.hitcount = 0 |
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417 |
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418 self._raw = array('c') |
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419 |
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420 data = repo.vfs.tryread(_fnodescachefile) |
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421 self._raw.fromstring(data) |
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422 |
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423 # The end state of self._raw is an array that is of the exact length |
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424 # required to hold a record for every revision in the repository. |
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425 # We truncate or extend the array as necessary. self._dirtyoffset is |
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426 # defined to be the start offset at which we need to write the output |
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427 # file. This offset is also adjusted when new entries are calculated |
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428 # for array members. |
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429 cllen = len(repo.changelog) |
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430 wantedlen = cllen * _fnodesrecsize |
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431 rawlen = len(self._raw) |
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432 |
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433 self._dirtyoffset = None |
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434 |
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435 if rawlen < wantedlen: |
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436 self._dirtyoffset = rawlen |
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437 self._raw.extend('\xff' * (wantedlen - rawlen)) |
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438 elif rawlen > wantedlen: |
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439 # There's no easy way to truncate array instances. This seems |
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440 # slightly less evil than copying a potentially large array slice. |
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441 for i in range(rawlen - wantedlen): |
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442 self._raw.pop() |
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443 self._dirtyoffset = len(self._raw) |
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444 |
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445 def getfnode(self, node): |
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446 """Obtain the filenode of the .hgtags file at a specified revision. |
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447 |
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448 If the value is in the cache, the entry will be validated and returned. |
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449 Otherwise, the filenode will be computed and returned. |
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450 |
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451 If an .hgtags does not exist at the specified revision, nullid is |
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452 returned. |
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453 """ |
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454 ctx = self._repo[node] |
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455 rev = ctx.rev() |
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456 |
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457 self.lookupcount += 1 |
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458 |
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459 offset = rev * _fnodesrecsize |
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460 record = self._raw[offset:offset + _fnodesrecsize].tostring() |
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461 properprefix = node[0:4] |
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462 |
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463 # Validate and return existing entry. |
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464 if record != _fnodesmissingrec: |
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465 fileprefix = record[0:4] |
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466 |
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467 if fileprefix == properprefix: |
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468 self.hitcount += 1 |
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469 return record[4:] |
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470 |
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471 # Fall through. |
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472 |
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473 # If we get here, the entry is either missing or invalid. Populate it. |
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474 try: |
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475 fnode = ctx.filenode('.hgtags') |
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476 except error.LookupError: |
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477 # No .hgtags file on this revision. |
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478 fnode = nullid |
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479 |
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480 # Slices on array instances only accept other array. |
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481 entry = array('c', properprefix + fnode) |
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482 self._raw[offset:offset + _fnodesrecsize] = entry |
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483 # self._dirtyoffset could be None. |
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484 self._dirtyoffset = min(self._dirtyoffset, offset) or 0 |
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485 |
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486 return fnode |
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487 |
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488 def write(self): |
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489 """Perform all necessary writes to cache file. |
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490 |
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491 This may no-op if no writes are needed or if a write lock could |
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492 not be obtained. |
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493 """ |
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494 if self._dirtyoffset is None: |
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495 return |
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496 |
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497 data = self._raw[self._dirtyoffset:] |
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498 if not data: |
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499 return |
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500 |
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501 repo = self._repo |
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502 |
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503 try: |
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504 lock = repo.wlock(wait=False) |
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505 except error.LockError: |
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506 repo.ui.log('tagscache', |
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507 'not writing .hg/%s because lock cannot be acquired\n' % |
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508 (_fnodescachefile)) |
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509 return |
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510 |
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511 try: |
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512 f = repo.vfs.open(_fnodescachefile, 'ab') |
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513 try: |
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514 # if the file has been truncated |
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515 actualoffset = f.tell() |
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516 if actualoffset < self._dirtyoffset: |
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517 self._dirtyoffset = actualoffset |
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518 data = self._raw[self._dirtyoffset:] |
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519 f.seek(self._dirtyoffset) |
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520 f.truncate() |
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521 repo.ui.log('tagscache', |
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522 'writing %d bytes to %s\n' % ( |
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523 len(data), _fnodescachefile)) |
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524 f.write(data) |
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525 self._dirtyoffset = None |
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526 finally: |
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527 f.close() |
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528 except (IOError, OSError), inst: |
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529 repo.ui.log('tagscache', |
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530 "couldn't write %s: %s\n" % ( |
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531 _fnodescachefile, inst)) |
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532 finally: |
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533 lock.release() |