Mercurial > hg
annotate mercurial/tags.py @ 50896:b2b8c25f9462
hgwebmod: use sysstr to check for attribute presence
We do not need bytes here.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 30 Aug 2023 13:28:09 +0200 |
parents | bb6eaa65d12a |
children | f02b62b7b056 |
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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 Olivia Mackall <olivia@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 |
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14 import binascii |
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15 import io |
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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 nullrev, |
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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 from .utils import stringutil |
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32 |
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33 # Tags computation can be expensive and caches exist to make it fast in |
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34 # the common case. |
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35 # |
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36 # The "hgtagsfnodes1" cache file caches the .hgtags filenode values for |
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37 # each revision in the repository. The file is effectively an array of |
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38 # fixed length records. Read the docs for "hgtagsfnodescache" for technical |
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39 # details. |
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40 # |
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41 # The .hgtags filenode cache grows in proportion to the length of the |
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42 # changelog. The file is truncated when the # changelog is stripped. |
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43 # |
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44 # The purpose of the filenode cache is to avoid the most expensive part |
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45 # of finding global tags, which is looking up the .hgtags filenode in the |
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46 # manifest for each head. This can take dozens or over 100ms for |
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47 # repositories with very large manifests. Multiplied by dozens or even |
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48 # hundreds of heads and there is a significant performance concern. |
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49 # |
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50 # There also exist a separate cache file for each repository filter. |
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51 # These "tags-*" files store information about the history of tags. |
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52 # |
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53 # The tags cache files consists of a cache validation line followed by |
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54 # a history of tags. |
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55 # |
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56 # The cache validation line has the format: |
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57 # |
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58 # <tiprev> <tipnode> [<filteredhash>] |
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59 # |
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60 # <tiprev> is an integer revision and <tipnode> is a 40 character hex |
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61 # node for that changeset. These redundantly identify the repository |
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62 # tip from the time the cache was written. In addition, <filteredhash>, |
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63 # if present, is a 40 character hex hash of the contents of the filtered |
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64 # revisions for this filter. If the set of filtered revs changes, the |
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65 # hash will change and invalidate the cache. |
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66 # |
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67 # The history part of the tags cache consists of lines of the form: |
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68 # |
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69 # <node> <tag> |
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70 # |
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71 # (This format is identical to that of .hgtags files.) |
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72 # |
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73 # <tag> is the tag name and <node> is the 40 character hex changeset |
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74 # the tag is associated with. |
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75 # |
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76 # Tags are written sorted by tag name. |
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77 # |
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78 # Tags associated with multiple changesets have an entry for each changeset. |
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79 # The most recent changeset (in terms of revlog ordering for the head |
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80 # setting it) for each tag is last. |
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81 |
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82 |
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83 def fnoderevs(ui, repo, revs): |
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84 """return the list of '.hgtags' fnodes used in a set revisions |
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85 |
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86 This is returned as list of unique fnodes. We use a list instead of a set |
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87 because order matters when it comes to tags.""" |
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88 unfi = repo.unfiltered() |
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89 tonode = unfi.changelog.node |
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90 nodes = [tonode(r) for r in revs] |
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91 fnodes = _getfnodes(ui, repo, nodes) |
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92 fnodes = _filterfnodes(fnodes, nodes) |
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93 return fnodes |
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94 |
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95 |
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96 def _nulltonone(repo, value): |
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97 """convert nullid to None |
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98 |
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99 For tag value, nullid means "deleted". This small utility function helps |
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100 translating that to None.""" |
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101 if value == repo.nullid: |
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102 return None |
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103 return value |
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104 |
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105 |
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106 def difftags(ui, repo, oldfnodes, newfnodes): |
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107 """list differences between tags expressed in two set of file-nodes |
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108 |
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109 The list contains entries in the form: (tagname, oldvalue, new value). |
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110 None is used to expressed missing value: |
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111 ('foo', None, 'abcd') is a new tag, |
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112 ('bar', 'ef01', None) is a deletion, |
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113 ('baz', 'abcd', 'ef01') is a tag movement. |
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114 """ |
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115 if oldfnodes == newfnodes: |
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116 return [] |
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117 oldtags = _tagsfromfnodes(ui, repo, oldfnodes) |
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118 newtags = _tagsfromfnodes(ui, repo, newfnodes) |
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119 |
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120 # list of (tag, old, new): None means missing |
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121 entries = [] |
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122 for tag, (new, __) in newtags.items(): |
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123 new = _nulltonone(repo, new) |
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124 old, __ = oldtags.pop(tag, (None, None)) |
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125 old = _nulltonone(repo, old) |
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126 if old != new: |
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127 entries.append((tag, old, new)) |
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128 # handle deleted tags |
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129 for tag, (old, __) in oldtags.items(): |
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130 old = _nulltonone(repo, old) |
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131 if old is not None: |
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132 entries.append((tag, old, None)) |
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133 entries.sort() |
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134 return entries |
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135 |
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136 |
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137 def writediff(fp, difflist): |
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138 """write tags diff information to a file. |
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139 |
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140 Data are stored with a line based format: |
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141 |
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142 <action> <hex-node> <tag-name>\n |
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143 |
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144 Action are defined as follow: |
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145 -R tag is removed, |
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146 +A tag is added, |
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147 -M tag is moved (old value), |
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148 +M tag is moved (new value), |
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149 |
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150 Example: |
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151 |
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152 +A 875517b4806a848f942811a315a5bce30804ae85 t5 |
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153 |
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154 See documentation of difftags output for details about the input. |
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155 """ |
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156 add = b'+A %s %s\n' |
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157 remove = b'-R %s %s\n' |
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158 updateold = b'-M %s %s\n' |
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159 updatenew = b'+M %s %s\n' |
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160 for tag, old, new in difflist: |
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161 # translate to hex |
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162 if old is not None: |
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163 old = hex(old) |
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164 if new is not None: |
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165 new = hex(new) |
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166 # write to file |
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167 if old is None: |
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168 fp.write(add % (new, tag)) |
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169 elif new is None: |
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170 fp.write(remove % (old, tag)) |
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171 else: |
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172 fp.write(updateold % (old, tag)) |
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173 fp.write(updatenew % (new, tag)) |
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174 |
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175 |
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176 def findglobaltags(ui, repo): |
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177 """Find global tags in a repo: return a tagsmap |
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178 |
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179 tagsmap: tag name to (node, hist) 2-tuples. |
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180 |
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181 The tags cache is read and updated as a side-effect of calling. |
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182 """ |
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183 (heads, tagfnode, valid, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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184 if cachetags is not None: |
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185 assert not shouldwrite |
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186 # XXX is this really 100% correct? are there oddball special |
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187 # cases where a global tag should outrank a local tag but won't, |
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188 # because cachetags does not contain rank info? |
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189 alltags = {} |
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190 _updatetags(cachetags, alltags) |
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191 return alltags |
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192 |
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193 for head in reversed(heads): # oldest to newest |
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194 assert repo.changelog.index.has_node( |
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195 head |
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196 ), b"tag cache returned bogus head %s" % short(head) |
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197 fnodes = _filterfnodes(tagfnode, reversed(heads)) |
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198 alltags = _tagsfromfnodes(ui, repo, fnodes) |
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199 |
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200 # and update the cache (if necessary) |
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201 if shouldwrite: |
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202 _writetagcache(ui, repo, valid, alltags) |
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203 return alltags |
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204 |
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205 |
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206 def _filterfnodes(tagfnode, nodes): |
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207 """return a list of unique fnodes |
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208 |
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209 The order of this list matches the order of "nodes". Preserving this order |
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210 is important as reading tags in different order provides different |
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211 results.""" |
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212 seen = set() # set of fnode |
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213 fnodes = [] |
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214 for no in nodes: # oldest to newest |
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215 fnode = tagfnode.get(no) |
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216 if fnode and fnode not in seen: |
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217 seen.add(fnode) |
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218 fnodes.append(fnode) |
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219 return fnodes |
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220 |
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221 |
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222 def _tagsfromfnodes(ui, repo, fnodes): |
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223 """return a tagsmap from a list of file-node |
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224 |
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225 tagsmap: tag name to (node, hist) 2-tuples. |
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226 |
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227 The order of the list matters.""" |
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228 alltags = {} |
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229 fctx = None |
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230 for fnode in fnodes: |
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231 if fctx is None: |
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232 fctx = repo.filectx(b'.hgtags', fileid=fnode) |
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233 else: |
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234 fctx = fctx.filectx(fnode) |
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235 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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236 _updatetags(filetags, alltags) |
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237 return alltags |
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238 |
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239 |
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240 def readlocaltags(ui, repo, alltags, tagtypes): |
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241 '''Read local tags in repo. Update alltags and tagtypes.''' |
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242 try: |
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243 data = repo.vfs.read(b"localtags") |
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244 except FileNotFoundError: |
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245 return |
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246 |
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247 # localtags is in the local encoding; re-encode to UTF-8 on |
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248 # input for consistency with the rest of this module. |
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249 filetags = _readtags( |
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250 ui, repo, data.splitlines(), b"localtags", recode=encoding.fromlocal |
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251 ) |
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252 |
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253 # remove tags pointing to invalid nodes |
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254 cl = repo.changelog |
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255 for t in list(filetags): |
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256 try: |
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257 cl.rev(filetags[t][0]) |
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258 except (LookupError, ValueError): |
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259 del filetags[t] |
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260 |
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261 _updatetags(filetags, alltags, b'local', tagtypes) |
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262 |
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263 |
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264 def _readtaghist(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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265 """Read tag definitions from a file (or any source of lines). |
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266 |
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267 This function returns two sortdicts with similar information: |
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268 |
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269 - the first dict, bintaghist, contains the tag information as expected by |
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270 the _readtags function, i.e. a mapping from tag name to (node, hist): |
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271 - node is the node id from the last line read for that name, |
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272 - hist is the list of node ids previously associated with it (in file |
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273 order). All node ids are binary, not hex. |
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274 |
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275 - the second dict, hextaglines, is a mapping from tag name to a list of |
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276 [hexnode, line number] pairs, ordered from the oldest to the newest node. |
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277 |
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278 When calcnodelines is False the hextaglines dict is not calculated (an |
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279 empty dict is returned). This is done to improve this function's |
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280 performance in cases where the line numbers are not needed. |
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281 """ |
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282 |
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283 bintaghist = util.sortdict() |
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284 hextaglines = util.sortdict() |
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285 count = 0 |
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286 |
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287 def dbg(msg): |
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288 ui.debug(b"%s, line %d: %s\n" % (fn, count, msg)) |
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289 |
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290 for nline, line in enumerate(lines): |
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291 count += 1 |
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292 if not line: |
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293 continue |
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294 try: |
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295 (nodehex, name) = line.split(b" ", 1) |
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296 except ValueError: |
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297 dbg(b"cannot parse entry") |
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298 continue |
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299 name = name.strip() |
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300 if recode: |
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301 name = recode(name) |
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302 try: |
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303 nodebin = bin(nodehex) |
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304 except binascii.Error: |
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305 dbg(b"node '%s' is not well formed" % nodehex) |
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306 continue |
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307 |
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308 # update filetags |
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309 if calcnodelines: |
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310 # map tag name to a list of line numbers |
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311 if name not in hextaglines: |
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312 hextaglines[name] = [] |
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313 hextaglines[name].append([nodehex, nline]) |
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314 continue |
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315 # map tag name to (node, hist) |
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316 if name not in bintaghist: |
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317 bintaghist[name] = [] |
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318 bintaghist[name].append(nodebin) |
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319 return bintaghist, hextaglines |
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320 |
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321 |
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322 def _readtags(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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323 """Read tag definitions from a file (or any source of lines). |
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324 |
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325 Returns a mapping from tag name to (node, hist). |
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326 |
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327 "node" is the node id from the last line read for that name. "hist" |
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328 is the list of node ids previously associated with it (in file order). |
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329 All node ids are binary, not hex. |
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330 """ |
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331 filetags, nodelines = _readtaghist( |
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332 ui, repo, lines, fn, recode=recode, calcnodelines=calcnodelines |
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333 ) |
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334 # util.sortdict().__setitem__ is much slower at replacing then inserting |
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335 # new entries. The difference can matter if there are thousands of tags. |
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336 # Create a new sortdict to avoid the performance penalty. |
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337 newtags = util.sortdict() |
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338 for tag, taghist in filetags.items(): |
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339 newtags[tag] = (taghist[-1], taghist[:-1]) |
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340 return newtags |
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341 |
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342 |
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343 def _updatetags(filetags, alltags, tagtype=None, tagtypes=None): |
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344 """Incorporate the tag info read from one file into dictionnaries |
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345 |
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346 The first one, 'alltags', is a "tagmaps" (see 'findglobaltags' for details). |
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347 |
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348 The second one, 'tagtypes', is optional and will be updated to track the |
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349 "tagtype" of entries in the tagmaps. When set, the 'tagtype' argument also |
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350 needs to be set.""" |
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351 if tagtype is None: |
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352 assert tagtypes is None |
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353 |
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354 for name, nodehist in filetags.items(): |
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355 if name not in alltags: |
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356 alltags[name] = nodehist |
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357 if tagtype is not None: |
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358 tagtypes[name] = tagtype |
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359 continue |
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360 |
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361 # we prefer alltags[name] if: |
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362 # it supersedes us OR |
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363 # mutual supersedes and it has a higher rank |
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364 # otherwise we win because we're tip-most |
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365 anode, ahist = nodehist |
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366 bnode, bhist = alltags[name] |
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367 if ( |
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368 bnode != anode |
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369 and anode in bhist |
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370 and (bnode not in ahist or len(bhist) > len(ahist)) |
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371 ): |
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372 anode = bnode |
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373 elif tagtype is not None: |
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374 tagtypes[name] = tagtype |
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375 ahist.extend([n for n in bhist if n not in ahist]) |
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376 alltags[name] = anode, ahist |
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377 |
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378 |
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379 def _filename(repo): |
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380 """name of a tagcache file for a given repo or repoview""" |
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381 filename = b'tags2' |
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382 if repo.filtername: |
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383 filename = b'%s-%s' % (filename, repo.filtername) |
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384 return filename |
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385 |
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386 |
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387 def _readtagcache(ui, repo): |
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388 """Read the tag cache. |
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389 |
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390 Returns a tuple (heads, fnodes, validinfo, cachetags, shouldwrite). |
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391 |
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392 If the cache is completely up-to-date, "cachetags" is a dict of the |
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393 form returned by _readtags() and "heads", "fnodes", and "validinfo" are |
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394 None and "shouldwrite" is False. |
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395 |
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396 If the cache is not up to date, "cachetags" is None. "heads" is a list |
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397 of all heads currently in the repository, ordered from tip to oldest. |
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398 "validinfo" is a tuple describing cache validation info. This is used |
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399 when writing the tags cache. "fnodes" is a mapping from head to .hgtags |
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400 filenode. "shouldwrite" is True. |
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401 |
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402 If the cache is not up to date, the caller is responsible for reading tag |
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403 info from each returned head. (See findglobaltags().) |
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404 """ |
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405 try: |
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406 cachefile = repo.cachevfs(_filename(repo), b'r') |
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407 # force reading the file for static-http |
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408 cachelines = iter(cachefile) |
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409 except IOError: |
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410 cachefile = None |
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411 |
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412 cacherev = None |
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413 cachenode = None |
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414 cachehash = None |
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415 if cachefile: |
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416 try: |
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417 validline = next(cachelines) |
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418 validline = validline.split() |
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419 cacherev = int(validline[0]) |
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420 cachenode = bin(validline[1]) |
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421 if len(validline) > 2: |
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422 cachehash = bin(validline[2]) |
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423 except Exception: |
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424 # corruption of the cache, just recompute it. |
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425 pass |
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426 |
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427 tipnode = repo.changelog.tip() |
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428 tiprev = len(repo.changelog) - 1 |
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429 |
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430 # Case 1 (common): tip is the same, so nothing has changed. |
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431 # (Unchanged tip trivially means no changesets have been added. |
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432 # But, thanks to localrepository.destroyed(), it also means none |
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433 # have been destroyed by strip or rollback.) |
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434 if ( |
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435 cacherev == tiprev |
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436 and cachenode == tipnode |
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437 and cachehash == scmutil.filteredhash(repo, tiprev) |
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438 ): |
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439 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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440 cachefile.close() |
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441 return (None, None, None, tags, False) |
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442 if cachefile: |
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443 cachefile.close() # ignore rest of file |
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444 |
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445 valid = (tiprev, tipnode, scmutil.filteredhash(repo, tiprev)) |
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446 |
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447 repoheads = repo.heads() |
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448 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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449 # writing an empty cache. |
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450 if repoheads == [repo.nullid]: |
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451 return ([], {}, valid, {}, False) |
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452 |
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453 # Case 3 (uncommon): cache file missing or empty. |
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454 |
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455 # Case 4 (uncommon): tip rev decreased. This should only happen |
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456 # when we're called from localrepository.destroyed(). Refresh the |
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457 # cache so future invocations will not see disappeared heads in the |
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458 # cache. |
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459 |
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460 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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461 |
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462 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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463 |
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464 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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465 # exposed". |
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466 if not len(repo.file(b'.hgtags')): |
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467 # No tags have ever been committed, so we can avoid a |
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468 # potentially expensive search. |
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469 return ([], {}, valid, None, True) |
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470 |
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471 # Now we have to lookup the .hgtags filenode for every new head. |
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472 # This is the most expensive part of finding tags, so performance |
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473 # depends primarily on the size of newheads. Worst case: no cache |
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474 # file, so newheads == repoheads. |
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475 # Reversed order helps the cache ('repoheads' is in descending order) |
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476 cachefnode = _getfnodes(ui, repo, reversed(repoheads)) |
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477 |
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478 # Caller has to iterate over all heads, but can use the filenodes in |
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479 # cachefnode to get to each .hgtags revision quickly. |
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480 return (repoheads, cachefnode, valid, None, True) |
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481 |
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482 |
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483 def _getfnodes(ui, repo, nodes): |
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484 """return .hgtags fnodes for a list of changeset nodes |
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485 |
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486 Return value is a {node: fnode} mapping. There will be no entry for nodes |
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487 without a '.hgtags' file. |
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488 """ |
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489 starttime = util.timer() |
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490 fnodescache = hgtagsfnodescache(repo.unfiltered()) |
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491 cachefnode = {} |
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492 validated_fnodes = set() |
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493 unknown_entries = set() |
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494 |
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495 flog = None |
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496 for node in nodes: |
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497 fnode = fnodescache.getfnode(node) |
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498 if fnode != repo.nullid: |
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499 if fnode not in validated_fnodes: |
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500 if flog is None: |
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501 flog = repo.file(b'.hgtags') |
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502 if flog.hasnode(fnode): |
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503 validated_fnodes.add(fnode) |
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504 else: |
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505 unknown_entries.add(node) |
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506 cachefnode[node] = fnode |
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507 |
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508 if unknown_entries: |
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509 fixed_nodemap = fnodescache.refresh_invalid_nodes(unknown_entries) |
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510 for node, fnode in fixed_nodemap.items(): |
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511 if fnode != repo.nullid: |
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512 cachefnode[node] = fnode |
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513 |
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514 fnodescache.write() |
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515 |
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516 duration = util.timer() - starttime |
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517 ui.log( |
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518 b'tagscache', |
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519 b'%d/%d cache hits/lookups in %0.4f seconds\n', |
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520 fnodescache.hitcount, |
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521 fnodescache.lookupcount, |
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522 duration, |
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523 ) |
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524 return cachefnode |
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525 |
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526 |
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527 def _writetagcache(ui, repo, valid, cachetags): |
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528 filename = _filename(repo) |
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529 try: |
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530 cachefile = repo.cachevfs(filename, b'w', atomictemp=True) |
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531 except (OSError, IOError): |
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532 return |
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533 |
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534 ui.log( |
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535 b'tagscache', |
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536 b'writing .hg/cache/%s with %d tags\n', |
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537 filename, |
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538 len(cachetags), |
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539 ) |
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540 |
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541 if valid[2]: |
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542 cachefile.write( |
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543 b'%d %s %s\n' % (valid[0], hex(valid[1]), hex(valid[2])) |
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544 ) |
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545 else: |
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546 cachefile.write(b'%d %s\n' % (valid[0], hex(valid[1]))) |
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547 |
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548 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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549 # we keep them in UTF-8 throughout this module. If we converted |
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550 # them local encoding on input, we would lose info writing them to |
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551 # the cache. |
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552 for (name, (node, hist)) in sorted(cachetags.items()): |
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553 for n in hist: |
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554 cachefile.write(b"%s %s\n" % (hex(n), name)) |
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555 cachefile.write(b"%s %s\n" % (hex(node), name)) |
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556 |
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557 try: |
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558 cachefile.close() |
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559 except (OSError, IOError): |
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560 pass |
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561 |
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562 |
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563 def tag(repo, names, node, message, local, user, date, editor=False): |
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564 """tag a revision with one or more symbolic names. |
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565 |
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566 names is a list of strings or, when adding a single tag, names may be a |
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567 string. |
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568 |
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569 if local is True, the tags are stored in a per-repository file. |
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570 otherwise, they are stored in the .hgtags file, and a new |
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571 changeset is committed with the change. |
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572 |
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573 keyword arguments: |
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574 |
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575 local: whether to store tags in non-version-controlled file |
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576 (default False) |
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577 |
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578 message: commit message to use if committing |
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579 |
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580 user: name of user to use if committing |
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581 |
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582 date: date tuple to use if committing""" |
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583 |
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584 if not local: |
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585 m = matchmod.exact([b'.hgtags']) |
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586 st = repo.status(match=m, unknown=True, ignored=True) |
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587 if any( |
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588 ( |
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589 st.modified, |
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590 st.added, |
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591 st.removed, |
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592 st.deleted, |
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593 st.unknown, |
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594 st.ignored, |
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595 ) |
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596 ): |
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597 raise error.Abort( |
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598 _(b'working copy of .hgtags is changed'), |
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599 hint=_(b'please commit .hgtags manually'), |
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600 ) |
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601 |
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602 with repo.wlock(): |
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603 repo.tags() # instantiate the cache |
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604 _tag(repo, names, node, message, local, user, date, editor=editor) |
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605 |
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606 |
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607 def _tag( |
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608 repo, names, node, message, local, user, date, extra=None, editor=False |
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609 ): |
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610 if isinstance(names, bytes): |
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611 names = (names,) |
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612 |
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613 branches = repo.branchmap() |
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614 for name in names: |
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615 repo.hook(b'pretag', throw=True, node=hex(node), tag=name, local=local) |
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616 if name in branches: |
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617 repo.ui.warn( |
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618 _(b"warning: tag %s conflicts with existing branch name\n") |
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619 % name |
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620 ) |
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621 |
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622 def writetags(fp, names, munge, prevtags): |
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623 fp.seek(0, io.SEEK_END) |
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624 if prevtags and not prevtags.endswith(b'\n'): |
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625 fp.write(b'\n') |
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626 for name in names: |
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627 if munge: |
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628 m = munge(name) |
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629 else: |
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630 m = name |
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631 |
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632 if repo._tagscache.tagtypes and name in repo._tagscache.tagtypes: |
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633 old = repo.tags().get(name, repo.nullid) |
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634 fp.write(b'%s %s\n' % (hex(old), m)) |
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635 fp.write(b'%s %s\n' % (hex(node), m)) |
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636 fp.close() |
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637 |
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638 prevtags = b'' |
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639 if local: |
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640 try: |
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641 fp = repo.vfs(b'localtags', b'r+') |
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642 except IOError: |
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643 fp = repo.vfs(b'localtags', b'a') |
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644 else: |
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645 prevtags = fp.read() |
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646 |
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647 # local tags are stored in the current charset |
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648 writetags(fp, names, None, prevtags) |
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649 for name in names: |
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650 repo.hook(b'tag', node=hex(node), tag=name, local=local) |
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651 return |
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652 |
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653 try: |
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654 fp = repo.wvfs(b'.hgtags', b'rb+') |
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655 except FileNotFoundError: |
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656 fp = repo.wvfs(b'.hgtags', b'ab') |
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657 else: |
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658 prevtags = fp.read() |
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659 |
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660 # committed tags are stored in UTF-8 |
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661 writetags(fp, names, encoding.fromlocal, prevtags) |
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662 |
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663 fp.close() |
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664 |
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665 repo.invalidatecaches() |
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666 |
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667 with repo.dirstate.changing_files(repo): |
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668 if b'.hgtags' not in repo.dirstate: |
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669 repo[None].add([b'.hgtags']) |
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670 |
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671 m = matchmod.exact([b'.hgtags']) |
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672 tagnode = repo.commit( |
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673 message, user, date, extra=extra, match=m, editor=editor |
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674 ) |
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675 |
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676 for name in names: |
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677 repo.hook(b'tag', node=hex(node), tag=name, local=local) |
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678 |
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679 return tagnode |
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680 |
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681 |
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682 _fnodescachefile = b'hgtagsfnodes1' |
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683 _fnodesrecsize = 4 + 20 # changeset fragment + filenode |
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684 _fnodesmissingrec = b'\xff' * 24 |
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685 |
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686 |
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687 class hgtagsfnodescache: |
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688 """Persistent cache mapping revisions to .hgtags filenodes. |
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689 |
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690 The cache is an array of records. Each item in the array corresponds to |
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691 a changelog revision. Values in the array contain the first 4 bytes of |
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692 the node hash and the 20 bytes .hgtags filenode for that revision. |
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693 |
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694 The first 4 bytes are present as a form of verification. Repository |
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695 stripping and rewriting may change the node at a numeric revision in the |
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696 changelog. The changeset fragment serves as a verifier to detect |
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697 rewriting. This logic is shared with the rev branch cache (see |
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698 branchmap.py). |
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699 |
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700 The instance holds in memory the full cache content but entries are |
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701 only parsed on read. |
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702 |
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703 Instances behave like lists. ``c[i]`` works where i is a rev or |
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704 changeset node. Missing indexes are populated automatically on access. |
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705 """ |
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706 |
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707 def __init__(self, repo): |
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708 assert repo.filtername is None |
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709 |
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710 self._repo = repo |
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711 |
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712 # Only for reporting purposes. |
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713 self.lookupcount = 0 |
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714 self.hitcount = 0 |
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715 |
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716 try: |
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717 data = repo.cachevfs.read(_fnodescachefile) |
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718 except (OSError, IOError): |
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719 data = b"" |
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720 self._raw = bytearray(data) |
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721 |
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722 # The end state of self._raw is an array that is of the exact length |
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723 # required to hold a record for every revision in the repository. |
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724 # We truncate or extend the array as necessary. self._dirtyoffset is |
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725 # defined to be the start offset at which we need to write the output |
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726 # file. This offset is also adjusted when new entries are calculated |
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727 # for array members. |
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728 cllen = len(repo.changelog) |
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729 wantedlen = cllen * _fnodesrecsize |
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730 rawlen = len(self._raw) |
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731 |
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732 self._dirtyoffset = None |
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733 |
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734 rawlentokeep = min( |
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735 wantedlen, (rawlen // _fnodesrecsize) * _fnodesrecsize |
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736 ) |
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737 if rawlen > rawlentokeep: |
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738 # There's no easy way to truncate array instances. This seems |
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739 # slightly less evil than copying a potentially large array slice. |
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740 for i in range(rawlen - rawlentokeep): |
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741 self._raw.pop() |
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742 rawlen = len(self._raw) |
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743 self._dirtyoffset = rawlen |
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744 if rawlen < wantedlen: |
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745 if self._dirtyoffset is None: |
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746 self._dirtyoffset = rawlen |
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747 # TODO: zero fill entire record, because it's invalid not missing? |
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748 self._raw.extend(b'\xff' * (wantedlen - rawlen)) |
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749 |
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750 def getfnode(self, node, computemissing=True): |
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751 """Obtain the filenode of the .hgtags file at a specified revision. |
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752 |
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753 If the value is in the cache, the entry will be validated and returned. |
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754 Otherwise, the filenode will be computed and returned unless |
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755 "computemissing" is False. In that case, None will be returned if |
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756 the entry is missing or False if the entry is invalid without |
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757 any potentially expensive computation being performed. |
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758 |
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759 If an .hgtags does not exist at the specified revision, nullid is |
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760 returned. |
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761 """ |
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762 if node == self._repo.nullid: |
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763 return node |
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764 |
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765 rev = self._repo.changelog.rev(node) |
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766 |
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767 self.lookupcount += 1 |
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768 |
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769 offset = rev * _fnodesrecsize |
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770 record = b'%s' % self._raw[offset : offset + _fnodesrecsize] |
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771 properprefix = node[0:4] |
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772 |
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773 # Validate and return existing entry. |
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774 if record != _fnodesmissingrec and len(record) == _fnodesrecsize: |
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775 fileprefix = record[0:4] |
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776 |
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777 if fileprefix == properprefix: |
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778 self.hitcount += 1 |
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779 return record[4:] |
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diff
changeset
|
780 |
07200e3332a1
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diff
changeset
|
781 # Fall through. |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
782 |
25380
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tags: support reading tags cache without populating
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diff
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|
783 # If we get here, the entry is either missing or invalid. |
eaa456c5e699
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diff
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|
784 |
eaa456c5e699
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diff
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|
785 if not computemissing: |
46495
5aac1a1a5beb
tagcache: distinguish between invalid and missing entries
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|
786 if record != _fnodesmissingrec: |
5aac1a1a5beb
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diff
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|
787 return False |
25380
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parents:
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diff
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|
788 return None |
eaa456c5e699
tags: support reading tags cache without populating
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
789 |
46652
75832107ec07
hgtagsfnodes: refactor code to compute fnode into separate fn
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diff
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|
790 fnode = self._computefnode(node) |
75832107ec07
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791 self._writeentry(offset, properprefix, fnode) |
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|
792 return fnode |
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diff
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|
793 |
75832107ec07
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|
794 def _computefnode(self, node): |
75832107ec07
hgtagsfnodes: refactor code to compute fnode into separate fn
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diff
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|
795 """Finds the tag filenode for a node which is missing or invalid |
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diff
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|
796 in cache""" |
75832107ec07
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changeset
|
797 ctx = self._repo[node] |
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diff
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|
798 rev = ctx.rev() |
42237
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hgtagsfnodescache: inherit fnode from parent when possible
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diff
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|
799 fnode = None |
9f45d3d526f9
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diff
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|
800 cl = self._repo.changelog |
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801 p1rev, p2rev = cl._uncheckedparentrevs(rev) |
9f45d3d526f9
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diff
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|
802 p1node = cl.node(p1rev) |
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diff
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|
803 p1fnode = self.getfnode(p1node, computemissing=False) |
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diff
changeset
|
804 if p2rev != nullrev: |
9f45d3d526f9
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Pierre-Yves David <pierre-yves.david@octobus.net>
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diff
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|
805 # There is some no-merge changeset where p1 is null and p2 is set |
9f45d3d526f9
hgtagsfnodescache: inherit fnode from parent when possible
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diff
changeset
|
806 # Processing them as merge is just slower, but still gives a good |
9f45d3d526f9
hgtagsfnodescache: inherit fnode from parent when possible
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|
807 # result. |
48989
d4b66dc500c5
tags: fix typo in fast path detection of fnode resolution (issue6673)
Yuya Nishihara <yuya@tcha.org>
parents:
47012
diff
changeset
|
808 p2node = cl.node(p2rev) |
42237
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diff
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|
809 p2fnode = self.getfnode(p2node, computemissing=False) |
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diff
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|
810 if p1fnode != p2fnode: |
9f45d3d526f9
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diff
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|
811 # we cannot rely on readfast because we don't know against what |
9f45d3d526f9
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diff
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|
812 # parent the readfast delta is computed |
9f45d3d526f9
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diff
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|
813 p1fnode = None |
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|
814 if p1fnode: |
42237
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diff
changeset
|
815 mctx = ctx.manifestctx() |
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|
816 fnode = mctx.readfast().get(b'.hgtags') |
42237
9f45d3d526f9
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diff
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|
817 if fnode is None: |
9f45d3d526f9
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diff
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|
818 fnode = p1fnode |
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diff
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|
819 if fnode is None: |
9f45d3d526f9
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diff
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|
820 # Populate missing entry. |
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|
821 try: |
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diff
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|
822 fnode = ctx.filenode(b'.hgtags') |
42237
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diff
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|
823 except error.LookupError: |
9f45d3d526f9
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parents:
42236
diff
changeset
|
824 # No .hgtags file on this revision. |
47012
d55b71393907
node: replace nullid and friends with nodeconstants class
Joerg Sonnenberger <joerg@bec.de>
parents:
46819
diff
changeset
|
825 fnode = self._repo.nullid |
25381
47edeff19139
tags: support setting hgtags fnodes cache entries
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diff
changeset
|
826 return fnode |
47edeff19139
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parents:
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diff
changeset
|
827 |
47edeff19139
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diff
changeset
|
828 def setfnode(self, node, fnode): |
47edeff19139
tags: support setting hgtags fnodes cache entries
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diff
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|
829 """Set the .hgtags filenode for a given changeset.""" |
47edeff19139
tags: support setting hgtags fnodes cache entries
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parents:
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diff
changeset
|
830 assert len(fnode) == 20 |
47edeff19139
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parents:
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diff
changeset
|
831 ctx = self._repo[node] |
47edeff19139
tags: support setting hgtags fnodes cache entries
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parents:
25380
diff
changeset
|
832 |
47edeff19139
tags: support setting hgtags fnodes cache entries
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parents:
25380
diff
changeset
|
833 # Do a lookup first to avoid writing if nothing has changed. |
47edeff19139
tags: support setting hgtags fnodes cache entries
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25380
diff
changeset
|
834 if self.getfnode(ctx.node(), computemissing=False) == fnode: |
47edeff19139
tags: support setting hgtags fnodes cache entries
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25380
diff
changeset
|
835 return |
47edeff19139
tags: support setting hgtags fnodes cache entries
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parents:
25380
diff
changeset
|
836 |
47edeff19139
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parents:
25380
diff
changeset
|
837 self._writeentry(ctx.rev() * _fnodesrecsize, node[0:4], fnode) |
47edeff19139
tags: support setting hgtags fnodes cache entries
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25380
diff
changeset
|
838 |
46656
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
Pulkit Goyal <7895pulkit@gmail.com>
parents:
46652
diff
changeset
|
839 def refresh_invalid_nodes(self, nodes): |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
Pulkit Goyal <7895pulkit@gmail.com>
parents:
46652
diff
changeset
|
840 """recomputes file nodes for a given set of nodes which has unknown |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
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parents:
46652
diff
changeset
|
841 filenodes for them in the cache |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
Pulkit Goyal <7895pulkit@gmail.com>
parents:
46652
diff
changeset
|
842 Also updates the in-memory cache with the correct filenode. |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
Pulkit Goyal <7895pulkit@gmail.com>
parents:
46652
diff
changeset
|
843 Caller needs to take care about calling `.write()` so that updates are |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
Pulkit Goyal <7895pulkit@gmail.com>
parents:
46652
diff
changeset
|
844 persisted. |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
Pulkit Goyal <7895pulkit@gmail.com>
parents:
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diff
changeset
|
845 Returns a map {node: recomputed fnode} |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
Pulkit Goyal <7895pulkit@gmail.com>
parents:
46652
diff
changeset
|
846 """ |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
Pulkit Goyal <7895pulkit@gmail.com>
parents:
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diff
changeset
|
847 fixed_nodemap = {} |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
Pulkit Goyal <7895pulkit@gmail.com>
parents:
46652
diff
changeset
|
848 for node in nodes: |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
Pulkit Goyal <7895pulkit@gmail.com>
parents:
46652
diff
changeset
|
849 fnode = self._computefnode(node) |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
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parents:
46652
diff
changeset
|
850 fixed_nodemap[node] = fnode |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
Pulkit Goyal <7895pulkit@gmail.com>
parents:
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diff
changeset
|
851 self.setfnode(node, fnode) |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
Pulkit Goyal <7895pulkit@gmail.com>
parents:
46652
diff
changeset
|
852 return fixed_nodemap |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
Pulkit Goyal <7895pulkit@gmail.com>
parents:
46652
diff
changeset
|
853 |
25381
47edeff19139
tags: support setting hgtags fnodes cache entries
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25380
diff
changeset
|
854 def _writeentry(self, offset, prefix, fnode): |
24735
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
855 # Slices on array instances only accept other array. |
31346
2a18e9e6ca43
py3: use bytearray() instead of array('c', ...) constructions
Augie Fackler <augie@google.com>
parents:
31025
diff
changeset
|
856 entry = bytearray(prefix + fnode) |
43076
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
42567
diff
changeset
|
857 self._raw[offset : offset + _fnodesrecsize] = entry |
24735
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
858 # self._dirtyoffset could be None. |
36277
18106c3bc94a
tags: don't feed both int and None to min()
Augie Fackler <augie@google.com>
parents:
35828
diff
changeset
|
859 self._dirtyoffset = min(self._dirtyoffset or 0, offset or 0) |
24735
07200e3332a1
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parents:
24532
diff
changeset
|
860 |
07200e3332a1
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parents:
24532
diff
changeset
|
861 def write(self): |
07200e3332a1
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parents:
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diff
changeset
|
862 """Perform all necessary writes to cache file. |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
863 |
07200e3332a1
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parents:
24532
diff
changeset
|
864 This may no-op if no writes are needed or if a write lock could |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
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parents:
24532
diff
changeset
|
865 not be obtained. |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
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parents:
24532
diff
changeset
|
866 """ |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
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parents:
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diff
changeset
|
867 if self._dirtyoffset is None: |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
868 return |
07200e3332a1
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parents:
24532
diff
changeset
|
869 |
43076
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diff
changeset
|
870 data = self._raw[self._dirtyoffset :] |
24735
07200e3332a1
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parents:
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diff
changeset
|
871 if not data: |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
872 return |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
873 |
07200e3332a1
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parents:
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diff
changeset
|
874 repo = self._repo |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
875 |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
876 try: |
45435
64de86fd0984
tags: take lock instead of wlock before writing hgtagsfnodes1 cache
Pulkit Goyal <7895pulkit@gmail.com>
parents:
44351
diff
changeset
|
877 lock = repo.lock(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
|
878 except error.LockError: |
43076
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
42567
diff
changeset
|
879 repo.ui.log( |
43077
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
880 b'tagscache', |
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
881 b'not writing .hg/cache/%s because ' |
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
882 b'lock cannot be acquired\n' % _fnodescachefile, |
43076
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
42567
diff
changeset
|
883 ) |
24735
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
884 return |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
885 |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
886 try: |
43077
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formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
887 f = repo.cachevfs.open(_fnodescachefile, b'ab') |
24735
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
888 try: |
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889 # if the file has been truncated |
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890 actualoffset = f.tell() |
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891 if actualoffset < self._dirtyoffset: |
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892 self._dirtyoffset = actualoffset |
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893 data = self._raw[self._dirtyoffset :] |
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894 f.seek(self._dirtyoffset) |
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895 f.truncate() |
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896 repo.ui.log( |
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897 b'tagscache', |
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898 b'writing %d bytes to cache/%s\n' |
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899 % (len(data), _fnodescachefile), |
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900 ) |
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901 f.write(data) |
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902 self._dirtyoffset = None |
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903 finally: |
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904 f.close() |
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905 except (IOError, OSError) as inst: |
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906 repo.ui.log( |
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907 b'tagscache', |
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908 b"couldn't write cache/%s: %s\n" |
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909 % (_fnodescachefile, stringutil.forcebytestr(inst)), |
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910 ) |
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911 finally: |
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912 lock.release() |