Mercurial > hg
annotate mercurial/tags.py @ 45849:731ea8fa1f11 stable
chg: show debug message for each fd to be closed
It helps debugging. The number of file descriptors should be small in most
cases, so the console output wouldn't get bloated even with CHG_DEBUG=1.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Tue, 03 Nov 2020 11:12:25 +0900 |
parents | 64de86fd0984 |
children | 225e513c444e |
rev | line source |
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1 # tags.py - read tag info from local repository |
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2 # |
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3 # Copyright 2009 Matt Mackall <mpm@selenic.com> |
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4 # Copyright 2009 Greg Ward <greg@gerg.ca> |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
10263 | 7 # GNU General Public License version 2 or any later version. |
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8 |
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9 # Currently this module only deals with reading and caching tags. |
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10 # Eventually, it could take care of updating (adding/removing/moving) |
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11 # tags too. |
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12 |
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13 from __future__ import absolute_import |
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14 |
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15 import errno |
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16 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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diff
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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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|
841 lock = repo.lock(wait=False) |
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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() |