Mercurial > hg
annotate mercurial/tags.py @ 32164:29e286fa4db0
changegroup: deduplicate 'getlocalchangegroup'
The two functions 'getlocalchangegroup' and 'getchangegroup' have been strictly
identical for multiple years ('getchangegroup' had a deprecated docstring)
We'll drop one of them (getlocalchangegroup, since it has the longest name).
However, we needs to migrate all users of the dropped one to the new one before
we can deprecate it. In the mean time we drop one of the duplicated definition
and the outdated docstring.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Thu, 04 May 2017 12:36:45 +0200 |
parents | e6e1884df298 |
children | 4f3f08262eb4 |
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 __future__ import absolute_import |
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14 |
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15 import errno |
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16 |
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17 from .node import ( |
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18 bin, |
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19 hex, |
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20 nullid, |
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21 short, |
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22 ) |
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23 from .i18n import _ |
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24 from . import ( |
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25 encoding, |
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26 error, |
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27 match as matchmod, |
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28 scmutil, |
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29 util, |
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30 ) |
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31 |
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32 # Tags computation can be expensive and caches exist to make it fast in |
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33 # the common case. |
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34 # |
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35 # The "hgtagsfnodes1" cache file caches the .hgtags filenode values for |
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36 # each revision in the repository. The file is effectively an array of |
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37 # fixed length records. Read the docs for "hgtagsfnodescache" for technical |
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38 # details. |
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39 # |
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40 # The .hgtags filenode cache grows in proportion to the length of the |
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41 # changelog. The file is truncated when the # changelog is stripped. |
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42 # |
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43 # The purpose of the filenode cache is to avoid the most expensive part |
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44 # of finding global tags, which is looking up the .hgtags filenode in the |
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45 # manifest for each head. This can take dozens or over 100ms for |
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46 # repositories with very large manifests. Multiplied by dozens or even |
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47 # hundreds of heads and there is a significant performance concern. |
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48 # |
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49 # There also exist a separate cache file for each repository filter. |
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50 # These "tags-*" files store information about the history of tags. |
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51 # |
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52 # The tags cache files consists of a cache validation line followed by |
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53 # a history of tags. |
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54 # |
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55 # The cache validation line has the format: |
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56 # |
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57 # <tiprev> <tipnode> [<filteredhash>] |
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58 # |
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59 # <tiprev> is an integer revision and <tipnode> is a 40 character hex |
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60 # node for that changeset. These redundantly identify the repository |
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61 # tip from the time the cache was written. In addition, <filteredhash>, |
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62 # if present, is a 40 character hex hash of the contents of the filtered |
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63 # revisions for this filter. If the set of filtered revs changes, the |
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64 # hash will change and invalidate the cache. |
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65 # |
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66 # The history part of the tags cache consists of lines of the form: |
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67 # |
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68 # <node> <tag> |
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69 # |
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70 # (This format is identical to that of .hgtags files.) |
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71 # |
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72 # <tag> is the tag name and <node> is the 40 character hex changeset |
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73 # the tag is associated with. |
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74 # |
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75 # Tags are written sorted by tag name. |
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76 # |
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77 # Tags associated with multiple changesets have an entry for each changeset. |
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78 # The most recent changeset (in terms of revlog ordering for the head |
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79 # setting it) for each tag is last. |
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80 |
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81 def fnoderevs(ui, repo, revs): |
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82 """return the list of '.hgtags' fnodes used in a set revisions |
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83 |
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84 This is returned as list of unique fnodes. We use a list instead of a set |
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85 because order matters when it comes to tags.""" |
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86 unfi = repo.unfiltered() |
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87 tonode = unfi.changelog.node |
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88 nodes = [tonode(r) for r in revs] |
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89 fnodes = _getfnodes(ui, repo, nodes[::-1]) # reversed help the cache |
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90 fnodes = _filterfnodes(fnodes, nodes) |
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91 return fnodes |
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92 |
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93 def _nulltonone(value): |
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94 """convert nullid to None |
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95 |
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96 For tag value, nullid means "deleted". This small utility function helps |
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97 translating that to None.""" |
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98 if value == nullid: |
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99 return None |
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100 return value |
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101 |
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102 def difftags(ui, repo, oldfnodes, newfnodes): |
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103 """list differences between tags expressed in two set of file-nodes |
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104 |
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105 The list contains entries in the form: (tagname, oldvalue, new value). |
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106 None is used to expressed missing value: |
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107 ('foo', None, 'abcd') is a new tag, |
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108 ('bar', 'ef01', None) is a deletion, |
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109 ('baz', 'abcd', 'ef01') is a tag movement. |
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110 """ |
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111 if oldfnodes == newfnodes: |
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112 return [] |
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113 oldtags = _tagsfromfnodes(ui, repo, oldfnodes) |
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114 newtags = _tagsfromfnodes(ui, repo, newfnodes) |
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115 |
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116 # list of (tag, old, new): None means missing |
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117 entries = [] |
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118 for tag, (new, __) in newtags.items(): |
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119 new = _nulltonone(new) |
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120 old, __ = oldtags.pop(tag, (None, None)) |
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121 old = _nulltonone(old) |
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122 if old != new: |
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123 entries.append((tag, old, new)) |
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124 # handle deleted tags |
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125 for tag, (old, __) in oldtags.items(): |
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126 old = _nulltonone(old) |
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127 if old is not None: |
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128 entries.append((tag, old, None)) |
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129 entries.sort() |
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130 return entries |
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131 |
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132 def writediff(fp, difflist): |
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133 """write tags diff information to a file. |
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134 |
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135 Data are stored with a line based format: |
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136 |
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137 <action> <hex-node> <tag-name>\n |
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138 |
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139 Action are defined as follow: |
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140 -R tag is removed, |
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141 +A tag is added, |
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142 -M tag is moved (old value), |
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143 +M tag is moved (new value), |
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144 |
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145 Example: |
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146 |
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147 +A 875517b4806a848f942811a315a5bce30804ae85 t5 |
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148 |
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149 See documentation of difftags output for details about the input. |
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150 """ |
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151 add = '+A %s %s\n' |
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152 remove = '-R %s %s\n' |
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153 updateold = '-M %s %s\n' |
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154 updatenew = '+M %s %s\n' |
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155 for tag, old, new in difflist: |
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156 # translate to hex |
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157 if old is not None: |
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158 old = hex(old) |
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159 if new is not None: |
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160 new = hex(new) |
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161 # write to file |
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162 if old is None: |
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163 fp.write(add % (new, tag)) |
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164 elif new is None: |
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165 fp.write(remove % (old, tag)) |
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166 else: |
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167 fp.write(updateold % (old, tag)) |
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168 fp.write(updatenew % (new, tag)) |
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169 |
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170 def findglobaltags(ui, repo): |
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171 '''Find global tags in a repo: return a tagsmap |
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172 |
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173 tagsmap: tag name to (node, hist) 2-tuples. |
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174 |
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175 The tags cache is read and updated as a side-effect of calling. |
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176 ''' |
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177 (heads, tagfnode, valid, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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178 if cachetags is not None: |
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179 assert not shouldwrite |
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180 # XXX is this really 100% correct? are there oddball special |
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181 # cases where a global tag should outrank a local tag but won't, |
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182 # because cachetags does not contain rank info? |
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183 alltags = {} |
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184 _updatetags(cachetags, alltags) |
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185 return alltags |
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186 |
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187 for head in reversed(heads): # oldest to newest |
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188 assert head in repo.changelog.nodemap, \ |
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189 "tag cache returned bogus head %s" % short(head) |
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190 fnodes = _filterfnodes(tagfnode, reversed(heads)) |
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191 alltags = _tagsfromfnodes(ui, repo, fnodes) |
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192 |
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193 # and update the cache (if necessary) |
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194 if shouldwrite: |
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195 _writetagcache(ui, repo, valid, alltags) |
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196 return alltags |
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197 |
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198 def _filterfnodes(tagfnode, nodes): |
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199 """return a list of unique fnodes |
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200 |
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201 The order of this list matches the order of "nodes". Preserving this order |
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202 is important as reading tags in different order provides different |
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203 results.""" |
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204 seen = set() # set of fnode |
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205 fnodes = [] |
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206 for no in nodes: # oldest to newest |
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207 fnode = tagfnode.get(no) |
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208 if fnode and fnode not in seen: |
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209 seen.add(fnode) |
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210 fnodes.append(fnode) |
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211 return fnodes |
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212 |
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213 def _tagsfromfnodes(ui, repo, fnodes): |
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214 """return a tagsmap from a list of file-node |
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215 |
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216 tagsmap: tag name to (node, hist) 2-tuples. |
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217 |
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218 The order of the list matters.""" |
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219 alltags = {} |
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220 fctx = None |
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221 for fnode in fnodes: |
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222 if fctx is None: |
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223 fctx = repo.filectx('.hgtags', fileid=fnode) |
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224 else: |
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225 fctx = fctx.filectx(fnode) |
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226 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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227 _updatetags(filetags, alltags) |
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228 return alltags |
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229 |
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230 def readlocaltags(ui, repo, alltags, tagtypes): |
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231 '''Read local tags in repo. Update alltags and tagtypes.''' |
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232 try: |
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233 data = repo.vfs.read("localtags") |
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234 except IOError as inst: |
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235 if inst.errno != errno.ENOENT: |
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236 raise |
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237 return |
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238 |
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239 # localtags is in the local encoding; re-encode to UTF-8 on |
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240 # input for consistency with the rest of this module. |
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241 filetags = _readtags( |
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242 ui, repo, data.splitlines(), "localtags", |
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243 recode=encoding.fromlocal) |
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244 |
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245 # remove tags pointing to invalid nodes |
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246 cl = repo.changelog |
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247 for t in filetags.keys(): |
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248 try: |
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249 cl.rev(filetags[t][0]) |
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250 except (LookupError, ValueError): |
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251 del filetags[t] |
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252 |
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253 _updatetags(filetags, alltags, 'local', tagtypes) |
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254 |
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255 def _readtaghist(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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256 '''Read tag definitions from a file (or any source of lines). |
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257 |
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258 This function returns two sortdicts with similar information: |
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259 |
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260 - the first dict, bintaghist, contains the tag information as expected by |
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261 the _readtags function, i.e. a mapping from tag name to (node, hist): |
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262 - node is the node id from the last line read for that name, |
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263 - hist is the list of node ids previously associated with it (in file |
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264 order). All node ids are binary, not hex. |
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265 |
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266 - the second dict, hextaglines, is a mapping from tag name to a list of |
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267 [hexnode, line number] pairs, ordered from the oldest to the newest node. |
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268 |
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269 When calcnodelines is False the hextaglines dict is not calculated (an |
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270 empty dict is returned). This is done to improve this function's |
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271 performance in cases where the line numbers are not needed. |
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272 ''' |
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273 |
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274 bintaghist = util.sortdict() |
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275 hextaglines = util.sortdict() |
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276 count = 0 |
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277 |
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278 def dbg(msg): |
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279 ui.debug("%s, line %s: %s\n" % (fn, count, msg)) |
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280 |
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281 for nline, line in enumerate(lines): |
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282 count += 1 |
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283 if not line: |
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284 continue |
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285 try: |
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286 (nodehex, name) = line.split(" ", 1) |
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287 except ValueError: |
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288 dbg("cannot parse entry") |
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289 continue |
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290 name = name.strip() |
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291 if recode: |
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292 name = recode(name) |
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293 try: |
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294 nodebin = bin(nodehex) |
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295 except TypeError: |
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296 dbg("node '%s' is not well formed" % nodehex) |
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297 continue |
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298 |
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299 # update filetags |
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300 if calcnodelines: |
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301 # map tag name to a list of line numbers |
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302 if name not in hextaglines: |
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303 hextaglines[name] = [] |
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304 hextaglines[name].append([nodehex, nline]) |
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305 continue |
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306 # map tag name to (node, hist) |
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307 if name not in bintaghist: |
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308 bintaghist[name] = [] |
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309 bintaghist[name].append(nodebin) |
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310 return bintaghist, hextaglines |
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311 |
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312 def _readtags(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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313 '''Read tag definitions from a file (or any source of lines). |
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314 |
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315 Returns a mapping from tag name to (node, hist). |
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316 |
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317 "node" is the node id from the last line read for that name. "hist" |
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318 is the list of node ids previously associated with it (in file order). |
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319 All node ids are binary, not hex. |
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320 ''' |
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321 filetags, nodelines = _readtaghist(ui, repo, lines, fn, recode=recode, |
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322 calcnodelines=calcnodelines) |
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323 # util.sortdict().__setitem__ is much slower at replacing then inserting |
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324 # new entries. The difference can matter if there are thousands of tags. |
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325 # Create a new sortdict to avoid the performance penalty. |
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326 newtags = util.sortdict() |
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327 for tag, taghist in filetags.items(): |
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328 newtags[tag] = (taghist[-1], taghist[:-1]) |
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329 return newtags |
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330 |
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331 def _updatetags(filetags, alltags, tagtype=None, tagtypes=None): |
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332 """Incorporate the tag info read from one file into dictionnaries |
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333 |
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334 The first one, 'alltags', is a "tagmaps" (see 'findglobaltags' for details). |
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335 |
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336 The second one, 'tagtypes', is optional and will be updated to track the |
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337 "tagtype" of entries in the tagmaps. When set, the 'tagtype' argument also |
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338 needs to be set.""" |
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339 if tagtype is None: |
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340 assert tagtypes is None |
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341 |
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342 for name, nodehist in filetags.iteritems(): |
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343 if name not in alltags: |
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344 alltags[name] = nodehist |
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345 if tagtype is not None: |
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346 tagtypes[name] = tagtype |
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347 continue |
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348 |
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349 # we prefer alltags[name] if: |
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350 # it supersedes us OR |
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351 # mutual supersedes and it has a higher rank |
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352 # otherwise we win because we're tip-most |
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353 anode, ahist = nodehist |
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354 bnode, bhist = alltags[name] |
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355 if (bnode != anode and anode in bhist and |
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356 (bnode not in ahist or len(bhist) > len(ahist))): |
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357 anode = bnode |
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358 elif tagtype is not None: |
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359 tagtypes[name] = tagtype |
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360 ahist.extend([n for n in bhist if n not in ahist]) |
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361 alltags[name] = anode, ahist |
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362 |
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363 def _filename(repo): |
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364 """name of a tagcache file for a given repo or repoview""" |
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365 filename = 'cache/tags2' |
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366 if repo.filtername: |
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367 filename = '%s-%s' % (filename, repo.filtername) |
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368 return filename |
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369 |
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370 def _readtagcache(ui, repo): |
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371 '''Read the tag cache. |
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372 |
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373 Returns a tuple (heads, fnodes, validinfo, cachetags, shouldwrite). |
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374 |
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375 If the cache is completely up-to-date, "cachetags" is a dict of the |
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376 form returned by _readtags() and "heads", "fnodes", and "validinfo" are |
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377 None and "shouldwrite" is False. |
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378 |
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379 If the cache is not up to date, "cachetags" is None. "heads" is a list |
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380 of all heads currently in the repository, ordered from tip to oldest. |
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381 "validinfo" is a tuple describing cache validation info. This is used |
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382 when writing the tags cache. "fnodes" is a mapping from head to .hgtags |
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383 filenode. "shouldwrite" is True. |
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384 |
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385 If the cache is not up to date, the caller is responsible for reading tag |
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386 info from each returned head. (See findglobaltags().) |
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387 ''' |
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388 try: |
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389 cachefile = repo.vfs(_filename(repo), 'r') |
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390 # force reading the file for static-http |
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391 cachelines = iter(cachefile) |
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392 except IOError: |
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393 cachefile = None |
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394 |
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395 cacherev = None |
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396 cachenode = None |
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397 cachehash = None |
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398 if cachefile: |
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399 try: |
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400 validline = next(cachelines) |
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401 validline = validline.split() |
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402 cacherev = int(validline[0]) |
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403 cachenode = bin(validline[1]) |
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404 if len(validline) > 2: |
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405 cachehash = bin(validline[2]) |
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406 except Exception: |
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407 # corruption of the cache, just recompute it. |
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408 pass |
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409 |
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410 tipnode = repo.changelog.tip() |
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411 tiprev = len(repo.changelog) - 1 |
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412 |
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413 # Case 1 (common): tip is the same, so nothing has changed. |
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414 # (Unchanged tip trivially means no changesets have been added. |
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415 # But, thanks to localrepository.destroyed(), it also means none |
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416 # have been destroyed by strip or rollback.) |
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417 if (cacherev == tiprev |
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418 and cachenode == tipnode |
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419 and cachehash == scmutil.filteredhash(repo, tiprev)): |
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420 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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421 cachefile.close() |
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422 return (None, None, None, tags, False) |
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423 if cachefile: |
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424 cachefile.close() # ignore rest of file |
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425 |
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426 valid = (tiprev, tipnode, scmutil.filteredhash(repo, tiprev)) |
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427 |
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428 repoheads = repo.heads() |
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429 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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430 # writing an empty cache. |
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431 if repoheads == [nullid]: |
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432 return ([], {}, valid, {}, False) |
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433 |
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434 # Case 3 (uncommon): cache file missing or empty. |
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435 |
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436 # Case 4 (uncommon): tip rev decreased. This should only happen |
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437 # when we're called from localrepository.destroyed(). Refresh the |
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438 # cache so future invocations will not see disappeared heads in the |
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439 # cache. |
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440 |
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441 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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442 |
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443 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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444 |
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445 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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446 # exposed". |
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447 if not len(repo.file('.hgtags')): |
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448 # No tags have ever been committed, so we can avoid a |
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449 # potentially expensive search. |
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450 return ([], {}, valid, None, True) |
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451 |
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452 |
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453 # Now we have to lookup the .hgtags filenode for every new head. |
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454 # This is the most expensive part of finding tags, so performance |
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455 # depends primarily on the size of newheads. Worst case: no cache |
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456 # file, so newheads == repoheads. |
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457 cachefnode = _getfnodes(ui, repo, repoheads) |
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458 |
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459 # Caller has to iterate over all heads, but can use the filenodes in |
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460 # cachefnode to get to each .hgtags revision quickly. |
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461 return (repoheads, cachefnode, valid, None, True) |
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462 |
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463 def _getfnodes(ui, repo, nodes): |
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464 """return .hgtags fnodes for a list of changeset nodes |
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465 |
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466 Return value is a {node: fnode} mapping. There will be no entry for nodes |
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467 without a '.hgtags' file. |
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468 """ |
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469 starttime = util.timer() |
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470 fnodescache = hgtagsfnodescache(repo.unfiltered()) |
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471 cachefnode = {} |
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472 for node in reversed(nodes): |
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473 fnode = fnodescache.getfnode(node) |
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474 if fnode != nullid: |
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475 cachefnode[node] = fnode |
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476 |
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477 fnodescache.write() |
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478 |
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479 duration = util.timer() - starttime |
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480 ui.log('tagscache', |
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481 '%d/%d cache hits/lookups in %0.4f ' |
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482 'seconds\n', |
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483 fnodescache.hitcount, fnodescache.lookupcount, duration) |
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484 return cachefnode |
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485 |
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486 def _writetagcache(ui, repo, valid, cachetags): |
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487 filename = _filename(repo) |
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488 try: |
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489 cachefile = repo.vfs(filename, 'w', atomictemp=True) |
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490 except (OSError, IOError): |
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491 return |
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492 |
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493 ui.log('tagscache', 'writing .hg/%s with %d tags\n', |
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494 filename, len(cachetags)) |
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495 |
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496 if valid[2]: |
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497 cachefile.write('%d %s %s\n' % (valid[0], hex(valid[1]), hex(valid[2]))) |
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498 else: |
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499 cachefile.write('%d %s\n' % (valid[0], hex(valid[1]))) |
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500 |
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501 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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502 # we keep them in UTF-8 throughout this module. If we converted |
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503 # them local encoding on input, we would lose info writing them to |
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504 # the cache. |
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505 for (name, (node, hist)) in sorted(cachetags.iteritems()): |
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506 for n in hist: |
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507 cachefile.write("%s %s\n" % (hex(n), name)) |
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508 cachefile.write("%s %s\n" % (hex(node), name)) |
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509 |
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510 try: |
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511 cachefile.close() |
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512 except (OSError, IOError): |
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513 pass |
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514 |
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515 def tag(repo, names, node, message, local, user, date, editor=False): |
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516 '''tag a revision with one or more symbolic names. |
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517 |
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518 names is a list of strings or, when adding a single tag, names may be a |
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519 string. |
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520 |
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521 if local is True, the tags are stored in a per-repository file. |
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522 otherwise, they are stored in the .hgtags file, and a new |
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523 changeset is committed with the change. |
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524 |
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525 keyword arguments: |
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526 |
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527 local: whether to store tags in non-version-controlled file |
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528 (default False) |
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529 |
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530 message: commit message to use if committing |
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531 |
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532 user: name of user to use if committing |
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533 |
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534 date: date tuple to use if committing''' |
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535 |
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536 if not local: |
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537 m = matchmod.exact(repo.root, '', ['.hgtags']) |
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538 if any(repo.status(match=m, unknown=True, ignored=True)): |
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539 raise error.Abort(_('working copy of .hgtags is changed'), |
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540 hint=_('please commit .hgtags manually')) |
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541 |
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542 repo.tags() # instantiate the cache |
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543 _tag(repo.unfiltered(), names, node, message, local, user, date, |
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544 editor=editor) |
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545 |
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546 def _tag(repo, names, node, message, local, user, date, extra=None, |
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547 editor=False): |
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548 if isinstance(names, str): |
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549 names = (names,) |
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550 |
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551 branches = repo.branchmap() |
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552 for name in names: |
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553 repo.hook('pretag', throw=True, node=hex(node), tag=name, |
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554 local=local) |
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555 if name in branches: |
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556 repo.ui.warn(_("warning: tag %s conflicts with existing" |
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557 " branch name\n") % name) |
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558 |
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559 def writetags(fp, names, munge, prevtags): |
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560 fp.seek(0, 2) |
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561 if prevtags and prevtags[-1] != '\n': |
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562 fp.write('\n') |
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563 for name in names: |
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564 if munge: |
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565 m = munge(name) |
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566 else: |
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567 m = name |
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568 |
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569 if (repo._tagscache.tagtypes and |
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570 name in repo._tagscache.tagtypes): |
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571 old = repo.tags().get(name, nullid) |
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572 fp.write('%s %s\n' % (hex(old), m)) |
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573 fp.write('%s %s\n' % (hex(node), m)) |
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574 fp.close() |
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575 |
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576 prevtags = '' |
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577 if local: |
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578 try: |
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579 fp = repo.vfs('localtags', 'r+') |
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580 except IOError: |
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581 fp = repo.vfs('localtags', 'a') |
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582 else: |
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583 prevtags = fp.read() |
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584 |
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585 # local tags are stored in the current charset |
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586 writetags(fp, names, None, prevtags) |
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587 for name in names: |
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588 repo.hook('tag', node=hex(node), tag=name, local=local) |
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589 return |
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590 |
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591 try: |
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592 fp = repo.wvfs('.hgtags', 'rb+') |
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593 except IOError as e: |
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594 if e.errno != errno.ENOENT: |
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595 raise |
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596 fp = repo.wvfs('.hgtags', 'ab') |
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597 else: |
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598 prevtags = fp.read() |
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599 |
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600 # committed tags are stored in UTF-8 |
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601 writetags(fp, names, encoding.fromlocal, prevtags) |
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602 |
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603 fp.close() |
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604 |
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605 repo.invalidatecaches() |
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606 |
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607 if '.hgtags' not in repo.dirstate: |
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608 repo[None].add(['.hgtags']) |
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609 |
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610 m = matchmod.exact(repo.root, '', ['.hgtags']) |
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611 tagnode = repo.commit(message, user, date, extra=extra, match=m, |
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612 editor=editor) |
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613 |
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614 for name in names: |
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615 repo.hook('tag', node=hex(node), tag=name, local=local) |
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616 |
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617 return tagnode |
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618 |
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619 _fnodescachefile = 'cache/hgtagsfnodes1' |
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620 _fnodesrecsize = 4 + 20 # changeset fragment + filenode |
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621 _fnodesmissingrec = '\xff' * 24 |
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622 |
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623 class hgtagsfnodescache(object): |
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624 """Persistent cache mapping revisions to .hgtags filenodes. |
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625 |
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626 The cache is an array of records. Each item in the array corresponds to |
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627 a changelog revision. Values in the array contain the first 4 bytes of |
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628 the node hash and the 20 bytes .hgtags filenode for that revision. |
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629 |
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630 The first 4 bytes are present as a form of verification. Repository |
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631 stripping and rewriting may change the node at a numeric revision in the |
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632 changelog. The changeset fragment serves as a verifier to detect |
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633 rewriting. This logic is shared with the rev branch cache (see |
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634 branchmap.py). |
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635 |
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636 The instance holds in memory the full cache content but entries are |
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637 only parsed on read. |
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638 |
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639 Instances behave like lists. ``c[i]`` works where i is a rev or |
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640 changeset node. Missing indexes are populated automatically on access. |
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641 """ |
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642 def __init__(self, repo): |
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643 assert repo.filtername is None |
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644 |
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645 self._repo = repo |
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646 |
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647 # Only for reporting purposes. |
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648 self.lookupcount = 0 |
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649 self.hitcount = 0 |
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650 |
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651 |
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652 try: |
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653 data = repo.vfs.read(_fnodescachefile) |
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654 except (OSError, IOError): |
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655 data = "" |
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656 self._raw = bytearray(data) |
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657 |
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658 # The end state of self._raw is an array that is of the exact length |
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659 # required to hold a record for every revision in the repository. |
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660 # We truncate or extend the array as necessary. self._dirtyoffset is |
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661 # defined to be the start offset at which we need to write the output |
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662 # file. This offset is also adjusted when new entries are calculated |
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663 # for array members. |
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664 cllen = len(repo.changelog) |
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665 wantedlen = cllen * _fnodesrecsize |
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666 rawlen = len(self._raw) |
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|
667 |
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668 self._dirtyoffset = None |
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|
669 |
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670 if rawlen < wantedlen: |
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671 self._dirtyoffset = rawlen |
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672 self._raw.extend('\xff' * (wantedlen - rawlen)) |
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673 elif rawlen > wantedlen: |
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674 # There's no easy way to truncate array instances. This seems |
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675 # slightly less evil than copying a potentially large array slice. |
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676 for i in range(rawlen - wantedlen): |
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677 self._raw.pop() |
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678 self._dirtyoffset = len(self._raw) |
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679 |
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680 def getfnode(self, node, computemissing=True): |
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681 """Obtain the filenode of the .hgtags file at a specified revision. |
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|
682 |
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683 If the value is in the cache, the entry will be validated and returned. |
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684 Otherwise, the filenode will be computed and returned unless |
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685 "computemissing" is False, in which case None will be returned without |
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|
686 any potentially expensive computation being performed. |
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|
687 |
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688 If an .hgtags does not exist at the specified revision, nullid is |
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689 returned. |
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690 """ |
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691 ctx = self._repo[node] |
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692 rev = ctx.rev() |
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693 |
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694 self.lookupcount += 1 |
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|
695 |
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696 offset = rev * _fnodesrecsize |
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697 record = '%s' % self._raw[offset:offset + _fnodesrecsize] |
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698 properprefix = node[0:4] |
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|
699 |
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700 # Validate and return existing entry. |
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701 if record != _fnodesmissingrec: |
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702 fileprefix = record[0:4] |
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|
703 |
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|
704 if fileprefix == properprefix: |
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705 self.hitcount += 1 |
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|
706 return record[4:] |
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|
707 |
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|
708 # Fall through. |
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|
709 |
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|
710 # If we get here, the entry is either missing or invalid. |
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|
711 |
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|
712 if not computemissing: |
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|
713 return None |
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|
714 |
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|
715 # Populate missing entry. |
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|
716 try: |
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|
717 fnode = ctx.filenode('.hgtags') |
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|
718 except error.LookupError: |
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|
719 # No .hgtags file on this revision. |
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diff
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|
720 fnode = nullid |
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|
721 |
25381
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changeset
|
722 self._writeentry(offset, properprefix, fnode) |
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|
723 return fnode |
47edeff19139
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diff
changeset
|
724 |
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changeset
|
725 def setfnode(self, node, fnode): |
47edeff19139
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|
726 """Set the .hgtags filenode for a given changeset.""" |
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diff
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|
727 assert len(fnode) == 20 |
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|
728 ctx = self._repo[node] |
47edeff19139
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diff
changeset
|
729 |
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diff
changeset
|
730 # Do a lookup first to avoid writing if nothing has changed. |
47edeff19139
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diff
changeset
|
731 if self.getfnode(ctx.node(), computemissing=False) == fnode: |
47edeff19139
tags: support setting hgtags fnodes cache entries
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parents:
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diff
changeset
|
732 return |
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changeset
|
733 |
47edeff19139
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changeset
|
734 self._writeentry(ctx.rev() * _fnodesrecsize, node[0:4], fnode) |
47edeff19139
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
735 |
47edeff19139
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diff
changeset
|
736 def _writeentry(self, offset, prefix, fnode): |
24735
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changeset
|
737 # Slices on array instances only accept other array. |
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py3: use bytearray() instead of array('c', ...) constructions
Augie Fackler <augie@google.com>
parents:
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changeset
|
738 entry = bytearray(prefix + fnode) |
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|
739 self._raw[offset:offset + _fnodesrecsize] = entry |
07200e3332a1
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parents:
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|
740 # self._dirtyoffset could be None. |
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
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|
741 self._dirtyoffset = min(self._dirtyoffset, offset) or 0 |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
742 |
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changeset
|
743 def write(self): |
07200e3332a1
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diff
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|
744 """Perform all necessary writes to cache file. |
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diff
changeset
|
745 |
07200e3332a1
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diff
changeset
|
746 This may no-op if no writes are needed or if a write lock could |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
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|
747 not be obtained. |
07200e3332a1
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parents:
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diff
changeset
|
748 """ |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
749 if self._dirtyoffset is None: |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
750 return |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
751 |
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
752 data = self._raw[self._dirtyoffset:] |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
753 if not data: |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
754 return |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
755 |
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diff
changeset
|
756 repo = self._repo |
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changeset
|
757 |
07200e3332a1
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parents:
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diff
changeset
|
758 try: |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
759 lock = repo.wlock(wait=False) |
24806
61aea11fb83d
tags: do not abort if failed to write lock file to save cache
Yuya Nishihara <yuya@tcha.org>
parents:
24763
diff
changeset
|
760 except error.LockError: |
24735
07200e3332a1
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parents:
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diff
changeset
|
761 repo.ui.log('tagscache', |
24806
61aea11fb83d
tags: do not abort if failed to write lock file to save cache
Yuya Nishihara <yuya@tcha.org>
parents:
24763
diff
changeset
|
762 'not writing .hg/%s because lock cannot be acquired\n' % |
24735
07200e3332a1
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parents:
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diff
changeset
|
763 (_fnodescachefile)) |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
764 return |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
765 |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
766 try: |
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Matt Mackall <mpm@selenic.com>
parents:
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diff
changeset
|
767 f = repo.vfs.open(_fnodescachefile, 'ab') |
24735
07200e3332a1
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diff
changeset
|
768 try: |
25087
559f24e3957d
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Matt Mackall <mpm@selenic.com>
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diff
changeset
|
769 # if the file has been truncated |
559f24e3957d
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Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
770 actualoffset = f.tell() |
559f24e3957d
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Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
771 if actualoffset < self._dirtyoffset: |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
772 self._dirtyoffset = actualoffset |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
773 data = self._raw[self._dirtyoffset:] |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
774 f.seek(self._dirtyoffset) |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
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diff
changeset
|
775 f.truncate() |
24735
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diff
changeset
|
776 repo.ui.log('tagscache', |
25087
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tags: use try/except/finally
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parents:
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diff
changeset
|
777 'writing %d bytes to %s\n' % ( |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
778 len(data), _fnodescachefile)) |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
779 f.write(data) |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
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780 self._dirtyoffset = None |
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781 finally: |
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782 f.close() |
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783 except (IOError, OSError) as inst: |
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784 repo.ui.log('tagscache', |
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785 "couldn't write %s: %s\n" % ( |
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786 _fnodescachefile, inst)) |
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787 finally: |
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788 lock.release() |