Mercurial > hg
annotate mercurial/tags.py @ 45726:d1072cba8aff
pycompat: update comment about unnamedtempfile
I found the comment clearer. I end up having to think about this for
`TemporaryFile` and I update that one in the process.
Differential Revision: https://phab.mercurial-scm.org/D9210
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 14 Oct 2020 21:47:14 +0200 |
parents | 64de86fd0984 |
children | 225e513c444e |
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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 import io |
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17 |
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18 from .node import ( |
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19 bin, |
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20 hex, |
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21 nullid, |
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22 nullrev, |
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23 short, |
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24 ) |
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25 from .i18n import _ |
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26 from . import ( |
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27 encoding, |
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28 error, |
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29 match as matchmod, |
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30 pycompat, |
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31 scmutil, |
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32 util, |
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33 ) |
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34 from .utils import stringutil |
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35 |
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36 # Tags computation can be expensive and caches exist to make it fast in |
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37 # the common case. |
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38 # |
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39 # The "hgtagsfnodes1" cache file caches the .hgtags filenode values for |
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40 # each revision in the repository. The file is effectively an array of |
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41 # fixed length records. Read the docs for "hgtagsfnodescache" for technical |
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42 # details. |
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43 # |
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44 # The .hgtags filenode cache grows in proportion to the length of the |
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45 # changelog. The file is truncated when the # changelog is stripped. |
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46 # |
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47 # The purpose of the filenode cache is to avoid the most expensive part |
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48 # of finding global tags, which is looking up the .hgtags filenode in the |
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49 # manifest for each head. This can take dozens or over 100ms for |
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50 # repositories with very large manifests. Multiplied by dozens or even |
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51 # hundreds of heads and there is a significant performance concern. |
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52 # |
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53 # There also exist a separate cache file for each repository filter. |
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54 # These "tags-*" files store information about the history of tags. |
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55 # |
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56 # The tags cache files consists of a cache validation line followed by |
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57 # a history of tags. |
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58 # |
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59 # The cache validation line has the format: |
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60 # |
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61 # <tiprev> <tipnode> [<filteredhash>] |
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62 # |
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63 # <tiprev> is an integer revision and <tipnode> is a 40 character hex |
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64 # node for that changeset. These redundantly identify the repository |
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65 # tip from the time the cache was written. In addition, <filteredhash>, |
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66 # if present, is a 40 character hex hash of the contents of the filtered |
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67 # revisions for this filter. If the set of filtered revs changes, the |
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68 # hash will change and invalidate the cache. |
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69 # |
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70 # The history part of the tags cache consists of lines of the form: |
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71 # |
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72 # <node> <tag> |
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73 # |
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74 # (This format is identical to that of .hgtags files.) |
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75 # |
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76 # <tag> is the tag name and <node> is the 40 character hex changeset |
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77 # the tag is associated with. |
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78 # |
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79 # Tags are written sorted by tag name. |
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80 # |
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81 # Tags associated with multiple changesets have an entry for each changeset. |
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82 # The most recent changeset (in terms of revlog ordering for the head |
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83 # setting it) for each tag is last. |
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84 |
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85 |
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86 def fnoderevs(ui, repo, revs): |
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87 """return the list of '.hgtags' fnodes used in a set revisions |
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88 |
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89 This is returned as list of unique fnodes. We use a list instead of a set |
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90 because order matters when it comes to tags.""" |
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91 unfi = repo.unfiltered() |
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92 tonode = unfi.changelog.node |
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93 nodes = [tonode(r) for r in revs] |
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94 fnodes = _getfnodes(ui, repo, nodes) |
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95 fnodes = _filterfnodes(fnodes, nodes) |
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96 return fnodes |
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97 |
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98 |
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99 def _nulltonone(value): |
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100 """convert nullid to None |
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101 |
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102 For tag value, nullid means "deleted". This small utility function helps |
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103 translating that to None.""" |
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104 if value == nullid: |
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105 return None |
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106 return value |
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107 |
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108 |
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109 def difftags(ui, repo, oldfnodes, newfnodes): |
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110 """list differences between tags expressed in two set of file-nodes |
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111 |
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112 The list contains entries in the form: (tagname, oldvalue, new value). |
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113 None is used to expressed missing value: |
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114 ('foo', None, 'abcd') is a new tag, |
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115 ('bar', 'ef01', None) is a deletion, |
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116 ('baz', 'abcd', 'ef01') is a tag movement. |
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117 """ |
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118 if oldfnodes == newfnodes: |
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119 return [] |
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120 oldtags = _tagsfromfnodes(ui, repo, oldfnodes) |
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121 newtags = _tagsfromfnodes(ui, repo, newfnodes) |
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122 |
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123 # list of (tag, old, new): None means missing |
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124 entries = [] |
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125 for tag, (new, __) in newtags.items(): |
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126 new = _nulltonone(new) |
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127 old, __ = oldtags.pop(tag, (None, None)) |
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128 old = _nulltonone(old) |
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129 if old != new: |
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130 entries.append((tag, old, new)) |
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131 # handle deleted tags |
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132 for tag, (old, __) in oldtags.items(): |
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133 old = _nulltonone(old) |
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134 if old is not None: |
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135 entries.append((tag, old, None)) |
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136 entries.sort() |
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137 return entries |
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138 |
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139 |
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140 def writediff(fp, difflist): |
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141 """write tags diff information to a file. |
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142 |
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143 Data are stored with a line based format: |
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144 |
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145 <action> <hex-node> <tag-name>\n |
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146 |
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147 Action are defined as follow: |
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148 -R tag is removed, |
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149 +A tag is added, |
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150 -M tag is moved (old value), |
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151 +M tag is moved (new value), |
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152 |
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153 Example: |
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154 |
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155 +A 875517b4806a848f942811a315a5bce30804ae85 t5 |
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156 |
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157 See documentation of difftags output for details about the input. |
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158 """ |
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159 add = b'+A %s %s\n' |
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160 remove = b'-R %s %s\n' |
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161 updateold = b'-M %s %s\n' |
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162 updatenew = b'+M %s %s\n' |
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163 for tag, old, new in difflist: |
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164 # translate to hex |
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165 if old is not None: |
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166 old = hex(old) |
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167 if new is not None: |
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168 new = hex(new) |
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169 # write to file |
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170 if old is None: |
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171 fp.write(add % (new, tag)) |
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172 elif new is None: |
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173 fp.write(remove % (old, tag)) |
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174 else: |
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175 fp.write(updateold % (old, tag)) |
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176 fp.write(updatenew % (new, tag)) |
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177 |
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178 |
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179 def findglobaltags(ui, repo): |
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180 '''Find global tags in a repo: return a tagsmap |
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181 |
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182 tagsmap: tag name to (node, hist) 2-tuples. |
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183 |
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184 The tags cache is read and updated as a side-effect of calling. |
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185 ''' |
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186 (heads, tagfnode, valid, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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187 if cachetags is not None: |
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188 assert not shouldwrite |
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189 # XXX is this really 100% correct? are there oddball special |
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190 # cases where a global tag should outrank a local tag but won't, |
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191 # because cachetags does not contain rank info? |
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192 alltags = {} |
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193 _updatetags(cachetags, alltags) |
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194 return alltags |
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195 |
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196 for head in reversed(heads): # oldest to newest |
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197 assert repo.changelog.index.has_node( |
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198 head |
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199 ), b"tag cache returned bogus head %s" % short(head) |
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200 fnodes = _filterfnodes(tagfnode, reversed(heads)) |
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201 alltags = _tagsfromfnodes(ui, repo, fnodes) |
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202 |
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203 # and update the cache (if necessary) |
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204 if shouldwrite: |
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205 _writetagcache(ui, repo, valid, alltags) |
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206 return alltags |
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207 |
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208 |
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209 def _filterfnodes(tagfnode, nodes): |
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210 """return a list of unique fnodes |
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211 |
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212 The order of this list matches the order of "nodes". Preserving this order |
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213 is important as reading tags in different order provides different |
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214 results.""" |
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215 seen = set() # set of fnode |
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216 fnodes = [] |
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217 for no in nodes: # oldest to newest |
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218 fnode = tagfnode.get(no) |
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219 if fnode and fnode not in seen: |
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220 seen.add(fnode) |
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221 fnodes.append(fnode) |
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222 return fnodes |
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223 |
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224 |
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225 def _tagsfromfnodes(ui, repo, fnodes): |
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226 """return a tagsmap from a list of file-node |
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227 |
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228 tagsmap: tag name to (node, hist) 2-tuples. |
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229 |
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230 The order of the list matters.""" |
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231 alltags = {} |
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232 fctx = None |
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233 for fnode in fnodes: |
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234 if fctx is None: |
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235 fctx = repo.filectx(b'.hgtags', fileid=fnode) |
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236 else: |
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237 fctx = fctx.filectx(fnode) |
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238 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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239 _updatetags(filetags, alltags) |
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240 return alltags |
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241 |
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242 |
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243 def readlocaltags(ui, repo, alltags, tagtypes): |
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244 '''Read local tags in repo. Update alltags and tagtypes.''' |
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245 try: |
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246 data = repo.vfs.read(b"localtags") |
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247 except IOError as inst: |
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248 if inst.errno != errno.ENOENT: |
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249 raise |
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250 return |
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251 |
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252 # localtags is in the local encoding; re-encode to UTF-8 on |
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253 # input for consistency with the rest of this module. |
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254 filetags = _readtags( |
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255 ui, repo, data.splitlines(), b"localtags", recode=encoding.fromlocal |
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256 ) |
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257 |
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258 # remove tags pointing to invalid nodes |
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259 cl = repo.changelog |
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260 for t in list(filetags): |
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261 try: |
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262 cl.rev(filetags[t][0]) |
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263 except (LookupError, ValueError): |
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264 del filetags[t] |
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265 |
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266 _updatetags(filetags, alltags, b'local', tagtypes) |
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267 |
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268 |
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269 def _readtaghist(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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270 '''Read tag definitions from a file (or any source of lines). |
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271 |
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272 This function returns two sortdicts with similar information: |
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273 |
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274 - the first dict, bintaghist, contains the tag information as expected by |
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275 the _readtags function, i.e. a mapping from tag name to (node, hist): |
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276 - node is the node id from the last line read for that name, |
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277 - hist is the list of node ids previously associated with it (in file |
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278 order). All node ids are binary, not hex. |
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279 |
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280 - the second dict, hextaglines, is a mapping from tag name to a list of |
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281 [hexnode, line number] pairs, ordered from the oldest to the newest node. |
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282 |
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283 When calcnodelines is False the hextaglines dict is not calculated (an |
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284 empty dict is returned). This is done to improve this function's |
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285 performance in cases where the line numbers are not needed. |
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286 ''' |
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287 |
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288 bintaghist = util.sortdict() |
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289 hextaglines = util.sortdict() |
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290 count = 0 |
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291 |
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292 def dbg(msg): |
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293 ui.debug(b"%s, line %d: %s\n" % (fn, count, msg)) |
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294 |
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295 for nline, line in enumerate(lines): |
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296 count += 1 |
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297 if not line: |
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298 continue |
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299 try: |
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300 (nodehex, name) = line.split(b" ", 1) |
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301 except ValueError: |
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302 dbg(b"cannot parse entry") |
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303 continue |
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304 name = name.strip() |
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305 if recode: |
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306 name = recode(name) |
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307 try: |
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308 nodebin = bin(nodehex) |
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309 except TypeError: |
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310 dbg(b"node '%s' is not well formed" % nodehex) |
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311 continue |
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312 |
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313 # update filetags |
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314 if calcnodelines: |
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315 # map tag name to a list of line numbers |
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316 if name not in hextaglines: |
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317 hextaglines[name] = [] |
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318 hextaglines[name].append([nodehex, nline]) |
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319 continue |
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320 # map tag name to (node, hist) |
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321 if name not in bintaghist: |
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322 bintaghist[name] = [] |
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323 bintaghist[name].append(nodebin) |
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324 return bintaghist, hextaglines |
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325 |
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326 |
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327 def _readtags(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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328 '''Read tag definitions from a file (or any source of lines). |
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329 |
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330 Returns a mapping from tag name to (node, hist). |
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331 |
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332 "node" is the node id from the last line read for that name. "hist" |
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333 is the list of node ids previously associated with it (in file order). |
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334 All node ids are binary, not hex. |
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335 ''' |
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336 filetags, nodelines = _readtaghist( |
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337 ui, repo, lines, fn, recode=recode, calcnodelines=calcnodelines |
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338 ) |
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339 # util.sortdict().__setitem__ is much slower at replacing then inserting |
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340 # new entries. The difference can matter if there are thousands of tags. |
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341 # Create a new sortdict to avoid the performance penalty. |
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342 newtags = util.sortdict() |
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343 for tag, taghist in filetags.items(): |
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344 newtags[tag] = (taghist[-1], taghist[:-1]) |
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345 return newtags |
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346 |
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347 |
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348 def _updatetags(filetags, alltags, tagtype=None, tagtypes=None): |
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349 """Incorporate the tag info read from one file into dictionnaries |
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350 |
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351 The first one, 'alltags', is a "tagmaps" (see 'findglobaltags' for details). |
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352 |
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353 The second one, 'tagtypes', is optional and will be updated to track the |
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354 "tagtype" of entries in the tagmaps. When set, the 'tagtype' argument also |
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355 needs to be set.""" |
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356 if tagtype is None: |
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357 assert tagtypes is None |
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358 |
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359 for name, nodehist in pycompat.iteritems(filetags): |
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360 if name not in alltags: |
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361 alltags[name] = nodehist |
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362 if tagtype is not None: |
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363 tagtypes[name] = tagtype |
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364 continue |
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365 |
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366 # we prefer alltags[name] if: |
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367 # it supersedes us OR |
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368 # mutual supersedes and it has a higher rank |
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369 # otherwise we win because we're tip-most |
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370 anode, ahist = nodehist |
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371 bnode, bhist = alltags[name] |
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372 if ( |
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373 bnode != anode |
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374 and anode in bhist |
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375 and (bnode not in ahist or len(bhist) > len(ahist)) |
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376 ): |
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377 anode = bnode |
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378 elif tagtype is not None: |
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379 tagtypes[name] = tagtype |
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380 ahist.extend([n for n in bhist if n not in ahist]) |
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381 alltags[name] = anode, ahist |
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382 |
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383 |
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384 def _filename(repo): |
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385 """name of a tagcache file for a given repo or repoview""" |
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386 filename = b'tags2' |
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387 if repo.filtername: |
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388 filename = b'%s-%s' % (filename, repo.filtername) |
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389 return filename |
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390 |
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391 |
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392 def _readtagcache(ui, repo): |
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393 '''Read the tag cache. |
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394 |
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395 Returns a tuple (heads, fnodes, validinfo, cachetags, shouldwrite). |
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396 |
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397 If the cache is completely up-to-date, "cachetags" is a dict of the |
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398 form returned by _readtags() and "heads", "fnodes", and "validinfo" are |
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399 None and "shouldwrite" is False. |
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400 |
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401 If the cache is not up to date, "cachetags" is None. "heads" is a list |
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402 of all heads currently in the repository, ordered from tip to oldest. |
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403 "validinfo" is a tuple describing cache validation info. This is used |
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404 when writing the tags cache. "fnodes" is a mapping from head to .hgtags |
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405 filenode. "shouldwrite" is True. |
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406 |
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407 If the cache is not up to date, the caller is responsible for reading tag |
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408 info from each returned head. (See findglobaltags().) |
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409 ''' |
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410 try: |
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411 cachefile = repo.cachevfs(_filename(repo), b'r') |
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412 # force reading the file for static-http |
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413 cachelines = iter(cachefile) |
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414 except IOError: |
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415 cachefile = None |
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416 |
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417 cacherev = None |
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418 cachenode = None |
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419 cachehash = None |
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420 if cachefile: |
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421 try: |
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422 validline = next(cachelines) |
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423 validline = validline.split() |
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424 cacherev = int(validline[0]) |
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425 cachenode = bin(validline[1]) |
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426 if len(validline) > 2: |
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427 cachehash = bin(validline[2]) |
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428 except Exception: |
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429 # corruption of the cache, just recompute it. |
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430 pass |
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431 |
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432 tipnode = repo.changelog.tip() |
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433 tiprev = len(repo.changelog) - 1 |
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434 |
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435 # Case 1 (common): tip is the same, so nothing has changed. |
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436 # (Unchanged tip trivially means no changesets have been added. |
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437 # But, thanks to localrepository.destroyed(), it also means none |
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438 # have been destroyed by strip or rollback.) |
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439 if ( |
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440 cacherev == tiprev |
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441 and cachenode == tipnode |
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442 and cachehash == scmutil.filteredhash(repo, tiprev) |
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443 ): |
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444 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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445 cachefile.close() |
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446 return (None, None, None, tags, False) |
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447 if cachefile: |
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448 cachefile.close() # ignore rest of file |
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449 |
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450 valid = (tiprev, tipnode, scmutil.filteredhash(repo, tiprev)) |
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451 |
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452 repoheads = repo.heads() |
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453 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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454 # writing an empty cache. |
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455 if repoheads == [nullid]: |
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456 return ([], {}, valid, {}, False) |
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457 |
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458 # Case 3 (uncommon): cache file missing or empty. |
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459 |
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460 # Case 4 (uncommon): tip rev decreased. This should only happen |
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461 # when we're called from localrepository.destroyed(). Refresh the |
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462 # cache so future invocations will not see disappeared heads in the |
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463 # cache. |
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464 |
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465 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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466 |
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467 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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468 |
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469 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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470 # exposed". |
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471 if not len(repo.file(b'.hgtags')): |
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472 # No tags have ever been committed, so we can avoid a |
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473 # potentially expensive search. |
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474 return ([], {}, valid, None, True) |
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475 |
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476 # Now we have to lookup the .hgtags filenode for every new head. |
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477 # This is the most expensive part of finding tags, so performance |
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478 # depends primarily on the size of newheads. Worst case: no cache |
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479 # file, so newheads == repoheads. |
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480 # Reversed order helps the cache ('repoheads' is in descending order) |
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481 cachefnode = _getfnodes(ui, repo, reversed(repoheads)) |
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482 |
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483 # Caller has to iterate over all heads, but can use the filenodes in |
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484 # cachefnode to get to each .hgtags revision quickly. |
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485 return (repoheads, cachefnode, valid, None, True) |
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486 |
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487 |
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488 def _getfnodes(ui, repo, nodes): |
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489 """return .hgtags fnodes for a list of changeset nodes |
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490 |
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491 Return value is a {node: fnode} mapping. There will be no entry for nodes |
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492 without a '.hgtags' file. |
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493 """ |
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494 starttime = util.timer() |
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495 fnodescache = hgtagsfnodescache(repo.unfiltered()) |
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496 cachefnode = {} |
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497 for node in nodes: |
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498 fnode = fnodescache.getfnode(node) |
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499 if fnode != nullid: |
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500 cachefnode[node] = fnode |
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501 |
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502 fnodescache.write() |
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503 |
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504 duration = util.timer() - starttime |
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505 ui.log( |
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506 b'tagscache', |
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507 b'%d/%d cache hits/lookups in %0.4f seconds\n', |
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508 fnodescache.hitcount, |
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509 fnodescache.lookupcount, |
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510 duration, |
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511 ) |
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512 return cachefnode |
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513 |
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514 |
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515 def _writetagcache(ui, repo, valid, cachetags): |
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516 filename = _filename(repo) |
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517 try: |
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518 cachefile = repo.cachevfs(filename, b'w', atomictemp=True) |
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519 except (OSError, IOError): |
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520 return |
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521 |
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522 ui.log( |
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523 b'tagscache', |
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524 b'writing .hg/cache/%s with %d tags\n', |
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525 filename, |
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526 len(cachetags), |
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527 ) |
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528 |
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529 if valid[2]: |
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530 cachefile.write( |
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531 b'%d %s %s\n' % (valid[0], hex(valid[1]), hex(valid[2])) |
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532 ) |
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533 else: |
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534 cachefile.write(b'%d %s\n' % (valid[0], hex(valid[1]))) |
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535 |
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536 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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537 # we keep them in UTF-8 throughout this module. If we converted |
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538 # them local encoding on input, we would lose info writing them to |
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539 # the cache. |
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540 for (name, (node, hist)) in sorted(pycompat.iteritems(cachetags)): |
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541 for n in hist: |
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542 cachefile.write(b"%s %s\n" % (hex(n), name)) |
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543 cachefile.write(b"%s %s\n" % (hex(node), name)) |
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544 |
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545 try: |
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546 cachefile.close() |
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547 except (OSError, IOError): |
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548 pass |
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549 |
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550 |
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551 def tag(repo, names, node, message, local, user, date, editor=False): |
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552 '''tag a revision with one or more symbolic names. |
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553 |
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554 names is a list of strings or, when adding a single tag, names may be a |
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555 string. |
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556 |
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557 if local is True, the tags are stored in a per-repository file. |
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558 otherwise, they are stored in the .hgtags file, and a new |
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559 changeset is committed with the change. |
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560 |
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561 keyword arguments: |
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562 |
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563 local: whether to store tags in non-version-controlled file |
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564 (default False) |
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565 |
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566 message: commit message to use if committing |
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567 |
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568 user: name of user to use if committing |
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569 |
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570 date: date tuple to use if committing''' |
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571 |
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572 if not local: |
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573 m = matchmod.exact([b'.hgtags']) |
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574 st = repo.status(match=m, unknown=True, ignored=True) |
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575 if any( |
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576 ( |
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577 st.modified, |
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578 st.added, |
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579 st.removed, |
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580 st.deleted, |
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581 st.unknown, |
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582 st.ignored, |
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583 ) |
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584 ): |
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585 raise error.Abort( |
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586 _(b'working copy of .hgtags is changed'), |
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587 hint=_(b'please commit .hgtags manually'), |
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588 ) |
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589 |
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590 with repo.wlock(): |
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591 repo.tags() # instantiate the cache |
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592 _tag(repo, names, node, message, local, user, date, editor=editor) |
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593 |
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594 |
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595 def _tag( |
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596 repo, names, node, message, local, user, date, extra=None, editor=False |
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597 ): |
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598 if isinstance(names, bytes): |
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599 names = (names,) |
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600 |
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601 branches = repo.branchmap() |
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602 for name in names: |
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603 repo.hook(b'pretag', throw=True, node=hex(node), tag=name, local=local) |
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604 if name in branches: |
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605 repo.ui.warn( |
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606 _(b"warning: tag %s conflicts with existing branch name\n") |
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607 % name |
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608 ) |
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609 |
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610 def writetags(fp, names, munge, prevtags): |
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611 fp.seek(0, io.SEEK_END) |
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612 if prevtags and not prevtags.endswith(b'\n'): |
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613 fp.write(b'\n') |
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614 for name in names: |
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615 if munge: |
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616 m = munge(name) |
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617 else: |
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618 m = name |
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619 |
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620 if repo._tagscache.tagtypes and name in repo._tagscache.tagtypes: |
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621 old = repo.tags().get(name, nullid) |
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622 fp.write(b'%s %s\n' % (hex(old), m)) |
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623 fp.write(b'%s %s\n' % (hex(node), m)) |
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624 fp.close() |
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625 |
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626 prevtags = b'' |
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627 if local: |
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628 try: |
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629 fp = repo.vfs(b'localtags', b'r+') |
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630 except IOError: |
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631 fp = repo.vfs(b'localtags', b'a') |
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632 else: |
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633 prevtags = fp.read() |
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634 |
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635 # local tags are stored in the current charset |
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636 writetags(fp, names, None, prevtags) |
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637 for name in names: |
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638 repo.hook(b'tag', node=hex(node), tag=name, local=local) |
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639 return |
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640 |
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641 try: |
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642 fp = repo.wvfs(b'.hgtags', b'rb+') |
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643 except IOError as e: |
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644 if e.errno != errno.ENOENT: |
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645 raise |
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646 fp = repo.wvfs(b'.hgtags', b'ab') |
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647 else: |
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648 prevtags = fp.read() |
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649 |
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650 # committed tags are stored in UTF-8 |
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651 writetags(fp, names, encoding.fromlocal, prevtags) |
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652 |
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653 fp.close() |
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654 |
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655 repo.invalidatecaches() |
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656 |
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657 if b'.hgtags' not in repo.dirstate: |
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658 repo[None].add([b'.hgtags']) |
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659 |
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660 m = matchmod.exact([b'.hgtags']) |
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661 tagnode = repo.commit( |
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662 message, user, date, extra=extra, match=m, editor=editor |
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663 ) |
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664 |
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665 for name in names: |
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666 repo.hook(b'tag', node=hex(node), tag=name, local=local) |
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667 |
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668 return tagnode |
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669 |
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670 |
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671 _fnodescachefile = b'hgtagsfnodes1' |
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672 _fnodesrecsize = 4 + 20 # changeset fragment + filenode |
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673 _fnodesmissingrec = b'\xff' * 24 |
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674 |
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675 |
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676 class hgtagsfnodescache(object): |
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677 """Persistent cache mapping revisions to .hgtags filenodes. |
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678 |
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679 The cache is an array of records. Each item in the array corresponds to |
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680 a changelog revision. Values in the array contain the first 4 bytes of |
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681 the node hash and the 20 bytes .hgtags filenode for that revision. |
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682 |
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683 The first 4 bytes are present as a form of verification. Repository |
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684 stripping and rewriting may change the node at a numeric revision in the |
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685 changelog. The changeset fragment serves as a verifier to detect |
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686 rewriting. This logic is shared with the rev branch cache (see |
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687 branchmap.py). |
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688 |
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689 The instance holds in memory the full cache content but entries are |
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690 only parsed on read. |
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691 |
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692 Instances behave like lists. ``c[i]`` works where i is a rev or |
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693 changeset node. Missing indexes are populated automatically on access. |
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694 """ |
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695 |
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696 def __init__(self, repo): |
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697 assert repo.filtername is None |
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698 |
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699 self._repo = repo |
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700 |
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701 # Only for reporting purposes. |
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702 self.lookupcount = 0 |
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703 self.hitcount = 0 |
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704 |
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705 try: |
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706 data = repo.cachevfs.read(_fnodescachefile) |
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707 except (OSError, IOError): |
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708 data = b"" |
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709 self._raw = bytearray(data) |
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710 |
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711 # The end state of self._raw is an array that is of the exact length |
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712 # required to hold a record for every revision in the repository. |
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713 # We truncate or extend the array as necessary. self._dirtyoffset is |
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714 # defined to be the start offset at which we need to write the output |
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715 # file. This offset is also adjusted when new entries are calculated |
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716 # for array members. |
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717 cllen = len(repo.changelog) |
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718 wantedlen = cllen * _fnodesrecsize |
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719 rawlen = len(self._raw) |
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720 |
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721 self._dirtyoffset = None |
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722 |
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|
723 rawlentokeep = min( |
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|
724 wantedlen, (rawlen // _fnodesrecsize) * _fnodesrecsize |
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|
725 ) |
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726 if rawlen > rawlentokeep: |
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727 # There's no easy way to truncate array instances. This seems |
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728 # slightly less evil than copying a potentially large array slice. |
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729 for i in range(rawlen - rawlentokeep): |
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730 self._raw.pop() |
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731 rawlen = len(self._raw) |
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732 self._dirtyoffset = rawlen |
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733 if rawlen < wantedlen: |
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734 if self._dirtyoffset is None: |
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735 self._dirtyoffset = rawlen |
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736 self._raw.extend(b'\xff' * (wantedlen - rawlen)) |
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737 |
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738 def getfnode(self, node, computemissing=True): |
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739 """Obtain the filenode of the .hgtags file at a specified revision. |
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740 |
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741 If the value is in the cache, the entry will be validated and returned. |
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742 Otherwise, the filenode will be computed and returned unless |
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743 "computemissing" is False, in which case None will be returned without |
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744 any potentially expensive computation being performed. |
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745 |
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746 If an .hgtags does not exist at the specified revision, nullid is |
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747 returned. |
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748 """ |
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|
749 if node == nullid: |
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750 return nullid |
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diff
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|
751 |
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752 ctx = self._repo[node] |
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753 rev = ctx.rev() |
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754 |
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755 self.lookupcount += 1 |
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756 |
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757 offset = rev * _fnodesrecsize |
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758 record = b'%s' % self._raw[offset : offset + _fnodesrecsize] |
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759 properprefix = node[0:4] |
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760 |
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761 # Validate and return existing entry. |
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762 if record != _fnodesmissingrec: |
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763 fileprefix = record[0:4] |
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764 |
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765 if fileprefix == properprefix: |
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766 self.hitcount += 1 |
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767 return record[4:] |
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768 |
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769 # Fall through. |
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770 |
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771 # If we get here, the entry is either missing or invalid. |
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772 |
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773 if not computemissing: |
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774 return None |
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|
775 |
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776 fnode = None |
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777 cl = self._repo.changelog |
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778 p1rev, p2rev = cl._uncheckedparentrevs(rev) |
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779 p1node = cl.node(p1rev) |
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780 p1fnode = self.getfnode(p1node, computemissing=False) |
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781 if p2rev != nullrev: |
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782 # There is some no-merge changeset where p1 is null and p2 is set |
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783 # Processing them as merge is just slower, but still gives a good |
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784 # result. |
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785 p2node = cl.node(p1rev) |
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786 p2fnode = self.getfnode(p2node, computemissing=False) |
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787 if p1fnode != p2fnode: |
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788 # we cannot rely on readfast because we don't know against what |
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789 # parent the readfast delta is computed |
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790 p1fnode = None |
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791 if p1fnode is not None: |
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792 mctx = ctx.manifestctx() |
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793 fnode = mctx.readfast().get(b'.hgtags') |
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794 if fnode is None: |
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795 fnode = p1fnode |
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796 if fnode is None: |
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797 # Populate missing entry. |
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798 try: |
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799 fnode = ctx.filenode(b'.hgtags') |
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800 except error.LookupError: |
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801 # No .hgtags file on this revision. |
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802 fnode = nullid |
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803 |
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804 self._writeentry(offset, properprefix, fnode) |
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805 return fnode |
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806 |
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807 def setfnode(self, node, fnode): |
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808 """Set the .hgtags filenode for a given changeset.""" |
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809 assert len(fnode) == 20 |
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810 ctx = self._repo[node] |
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811 |
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812 # Do a lookup first to avoid writing if nothing has changed. |
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813 if self.getfnode(ctx.node(), computemissing=False) == fnode: |
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814 return |
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815 |
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816 self._writeentry(ctx.rev() * _fnodesrecsize, node[0:4], fnode) |
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817 |
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818 def _writeentry(self, offset, prefix, fnode): |
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819 # Slices on array instances only accept other array. |
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820 entry = bytearray(prefix + fnode) |
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821 self._raw[offset : offset + _fnodesrecsize] = entry |
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822 # self._dirtyoffset could be None. |
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|
823 self._dirtyoffset = min(self._dirtyoffset or 0, offset or 0) |
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824 |
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825 def write(self): |
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826 """Perform all necessary writes to cache file. |
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827 |
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828 This may no-op if no writes are needed or if a write lock could |
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829 not be obtained. |
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830 """ |
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831 if self._dirtyoffset is None: |
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832 return |
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833 |
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834 data = self._raw[self._dirtyoffset :] |
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835 if not data: |
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|
836 return |
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837 |
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838 repo = self._repo |
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839 |
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|
840 try: |
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changeset
|
841 lock = repo.lock(wait=False) |
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tags: do not abort if failed to write lock file to save cache
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|
842 except error.LockError: |
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|
843 repo.ui.log( |
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|
844 b'tagscache', |
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|
845 b'not writing .hg/cache/%s because ' |
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|
846 b'lock cannot be acquired\n' % _fnodescachefile, |
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|
847 ) |
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|
848 return |
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|
849 |
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|
850 try: |
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|
851 f = repo.cachevfs.open(_fnodescachefile, b'ab') |
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852 try: |
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|
853 # if the file has been truncated |
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|
854 actualoffset = f.tell() |
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|
855 if actualoffset < self._dirtyoffset: |
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|
856 self._dirtyoffset = actualoffset |
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857 data = self._raw[self._dirtyoffset :] |
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|
858 f.seek(self._dirtyoffset) |
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|
859 f.truncate() |
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860 repo.ui.log( |
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861 b'tagscache', |
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862 b'writing %d bytes to cache/%s\n' |
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863 % (len(data), _fnodescachefile), |
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|
864 ) |
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|
865 f.write(data) |
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|
866 self._dirtyoffset = None |
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|
867 finally: |
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|
868 f.close() |
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|
869 except (IOError, OSError) as inst: |
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|
870 repo.ui.log( |
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|
871 b'tagscache', |
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|
872 b"couldn't write cache/%s: %s\n" |
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|
873 % (_fnodescachefile, stringutil.forcebytestr(inst)), |
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|
874 ) |
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|
875 finally: |
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|
876 lock.release() |