Mercurial > hg
annotate mercurial/tags.py @ 43091:127cc1f72e70
py3: stop normalizing .encode()/.decode() arguments to unicode
Now that we don't byte transform string literals, we no longer need
this transform.
While we're here, we also drop some superfluous u'' prefix in existing
callers.
Differential Revision: https://phab.mercurial-scm.org/D7011
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 06 Oct 2019 17:27:51 -0400 |
parents | 687b865b95ad |
children | d783f945a701 |
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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 scmutil, |
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31 util, |
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32 ) |
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33 from .utils import stringutil |
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34 |
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35 # Tags computation can be expensive and caches exist to make it fast in |
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36 # the common case. |
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37 # |
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38 # The "hgtagsfnodes1" cache file caches the .hgtags filenode values for |
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39 # each revision in the repository. The file is effectively an array of |
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40 # fixed length records. Read the docs for "hgtagsfnodescache" for technical |
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41 # details. |
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42 # |
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43 # The .hgtags filenode cache grows in proportion to the length of the |
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44 # changelog. The file is truncated when the # changelog is stripped. |
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45 # |
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46 # The purpose of the filenode cache is to avoid the most expensive part |
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47 # of finding global tags, which is looking up the .hgtags filenode in the |
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48 # manifest for each head. This can take dozens or over 100ms for |
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49 # repositories with very large manifests. Multiplied by dozens or even |
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50 # hundreds of heads and there is a significant performance concern. |
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51 # |
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52 # There also exist a separate cache file for each repository filter. |
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53 # These "tags-*" files store information about the history of tags. |
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54 # |
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55 # The tags cache files consists of a cache validation line followed by |
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56 # a history of tags. |
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57 # |
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58 # The cache validation line has the format: |
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59 # |
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60 # <tiprev> <tipnode> [<filteredhash>] |
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61 # |
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62 # <tiprev> is an integer revision and <tipnode> is a 40 character hex |
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63 # node for that changeset. These redundantly identify the repository |
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64 # tip from the time the cache was written. In addition, <filteredhash>, |
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65 # if present, is a 40 character hex hash of the contents of the filtered |
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66 # revisions for this filter. If the set of filtered revs changes, the |
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67 # hash will change and invalidate the cache. |
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68 # |
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69 # The history part of the tags cache consists of lines of the form: |
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70 # |
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71 # <node> <tag> |
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72 # |
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73 # (This format is identical to that of .hgtags files.) |
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74 # |
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75 # <tag> is the tag name and <node> is the 40 character hex changeset |
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76 # the tag is associated with. |
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77 # |
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78 # Tags are written sorted by tag name. |
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79 # |
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80 # Tags associated with multiple changesets have an entry for each changeset. |
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81 # The most recent changeset (in terms of revlog ordering for the head |
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82 # setting it) for each tag is last. |
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83 |
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84 |
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85 def fnoderevs(ui, repo, revs): |
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86 """return the list of '.hgtags' fnodes used in a set revisions |
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87 |
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88 This is returned as list of unique fnodes. We use a list instead of a set |
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89 because order matters when it comes to tags.""" |
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90 unfi = repo.unfiltered() |
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91 tonode = unfi.changelog.node |
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92 nodes = [tonode(r) for r in revs] |
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93 fnodes = _getfnodes(ui, repo, nodes) |
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94 fnodes = _filterfnodes(fnodes, nodes) |
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95 return fnodes |
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96 |
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97 |
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98 def _nulltonone(value): |
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99 """convert nullid to None |
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100 |
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101 For tag value, nullid means "deleted". This small utility function helps |
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102 translating that to None.""" |
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103 if value == nullid: |
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104 return None |
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105 return value |
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106 |
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107 |
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108 def difftags(ui, repo, oldfnodes, newfnodes): |
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109 """list differences between tags expressed in two set of file-nodes |
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110 |
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111 The list contains entries in the form: (tagname, oldvalue, new value). |
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112 None is used to expressed missing value: |
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113 ('foo', None, 'abcd') is a new tag, |
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114 ('bar', 'ef01', None) is a deletion, |
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115 ('baz', 'abcd', 'ef01') is a tag movement. |
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116 """ |
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117 if oldfnodes == newfnodes: |
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118 return [] |
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119 oldtags = _tagsfromfnodes(ui, repo, oldfnodes) |
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120 newtags = _tagsfromfnodes(ui, repo, newfnodes) |
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121 |
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122 # list of (tag, old, new): None means missing |
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123 entries = [] |
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124 for tag, (new, __) in newtags.items(): |
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125 new = _nulltonone(new) |
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126 old, __ = oldtags.pop(tag, (None, None)) |
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127 old = _nulltonone(old) |
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128 if old != new: |
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129 entries.append((tag, old, new)) |
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130 # handle deleted tags |
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131 for tag, (old, __) in oldtags.items(): |
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132 old = _nulltonone(old) |
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133 if old is not None: |
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134 entries.append((tag, old, None)) |
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135 entries.sort() |
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136 return entries |
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137 |
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138 |
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139 def writediff(fp, difflist): |
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140 """write tags diff information to a file. |
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141 |
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142 Data are stored with a line based format: |
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143 |
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144 <action> <hex-node> <tag-name>\n |
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145 |
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146 Action are defined as follow: |
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147 -R tag is removed, |
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148 +A tag is added, |
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149 -M tag is moved (old value), |
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150 +M tag is moved (new value), |
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151 |
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152 Example: |
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153 |
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154 +A 875517b4806a848f942811a315a5bce30804ae85 t5 |
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155 |
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156 See documentation of difftags output for details about the input. |
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157 """ |
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158 add = b'+A %s %s\n' |
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159 remove = b'-R %s %s\n' |
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160 updateold = b'-M %s %s\n' |
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161 updatenew = b'+M %s %s\n' |
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162 for tag, old, new in difflist: |
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163 # translate to hex |
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164 if old is not None: |
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165 old = hex(old) |
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166 if new is not None: |
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167 new = hex(new) |
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168 # write to file |
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169 if old is None: |
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170 fp.write(add % (new, tag)) |
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171 elif new is None: |
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172 fp.write(remove % (old, tag)) |
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173 else: |
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174 fp.write(updateold % (old, tag)) |
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175 fp.write(updatenew % (new, tag)) |
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176 |
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177 |
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178 def findglobaltags(ui, repo): |
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179 '''Find global tags in a repo: return a tagsmap |
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180 |
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181 tagsmap: tag name to (node, hist) 2-tuples. |
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182 |
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183 The tags cache is read and updated as a side-effect of calling. |
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184 ''' |
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185 (heads, tagfnode, valid, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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186 if cachetags is not None: |
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187 assert not shouldwrite |
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188 # XXX is this really 100% correct? are there oddball special |
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189 # cases where a global tag should outrank a local tag but won't, |
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190 # because cachetags does not contain rank info? |
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191 alltags = {} |
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192 _updatetags(cachetags, alltags) |
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193 return alltags |
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194 |
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195 for head in reversed(heads): # oldest to newest |
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196 assert ( |
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197 head in repo.changelog.nodemap |
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198 ), b"tag cache returned bogus head %s" % short(head) |
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199 fnodes = _filterfnodes(tagfnode, reversed(heads)) |
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200 alltags = _tagsfromfnodes(ui, repo, fnodes) |
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201 |
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202 # and update the cache (if necessary) |
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203 if shouldwrite: |
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204 _writetagcache(ui, repo, valid, alltags) |
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205 return alltags |
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206 |
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207 |
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208 def _filterfnodes(tagfnode, nodes): |
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209 """return a list of unique fnodes |
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210 |
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211 The order of this list matches the order of "nodes". Preserving this order |
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212 is important as reading tags in different order provides different |
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213 results.""" |
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214 seen = set() # set of fnode |
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215 fnodes = [] |
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216 for no in nodes: # oldest to newest |
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217 fnode = tagfnode.get(no) |
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218 if fnode and fnode not in seen: |
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219 seen.add(fnode) |
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220 fnodes.append(fnode) |
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221 return fnodes |
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222 |
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223 |
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224 def _tagsfromfnodes(ui, repo, fnodes): |
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225 """return a tagsmap from a list of file-node |
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226 |
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227 tagsmap: tag name to (node, hist) 2-tuples. |
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228 |
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229 The order of the list matters.""" |
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230 alltags = {} |
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231 fctx = None |
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232 for fnode in fnodes: |
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233 if fctx is None: |
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234 fctx = repo.filectx(b'.hgtags', fileid=fnode) |
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235 else: |
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236 fctx = fctx.filectx(fnode) |
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237 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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238 _updatetags(filetags, alltags) |
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239 return alltags |
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240 |
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241 |
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242 def readlocaltags(ui, repo, alltags, tagtypes): |
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243 '''Read local tags in repo. Update alltags and tagtypes.''' |
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244 try: |
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245 data = repo.vfs.read(b"localtags") |
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246 except IOError as inst: |
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247 if inst.errno != errno.ENOENT: |
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248 raise |
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249 return |
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250 |
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251 # localtags is in the local encoding; re-encode to UTF-8 on |
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252 # input for consistency with the rest of this module. |
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253 filetags = _readtags( |
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254 ui, repo, data.splitlines(), b"localtags", recode=encoding.fromlocal |
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255 ) |
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256 |
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257 # remove tags pointing to invalid nodes |
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258 cl = repo.changelog |
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259 for t in list(filetags): |
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260 try: |
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261 cl.rev(filetags[t][0]) |
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262 except (LookupError, ValueError): |
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263 del filetags[t] |
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264 |
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265 _updatetags(filetags, alltags, b'local', tagtypes) |
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266 |
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267 |
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268 def _readtaghist(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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269 '''Read tag definitions from a file (or any source of lines). |
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270 |
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271 This function returns two sortdicts with similar information: |
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272 |
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273 - the first dict, bintaghist, contains the tag information as expected by |
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274 the _readtags function, i.e. a mapping from tag name to (node, hist): |
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275 - node is the node id from the last line read for that name, |
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276 - hist is the list of node ids previously associated with it (in file |
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277 order). All node ids are binary, not hex. |
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278 |
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279 - the second dict, hextaglines, is a mapping from tag name to a list of |
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280 [hexnode, line number] pairs, ordered from the oldest to the newest node. |
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281 |
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282 When calcnodelines is False the hextaglines dict is not calculated (an |
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283 empty dict is returned). This is done to improve this function's |
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284 performance in cases where the line numbers are not needed. |
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285 ''' |
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286 |
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287 bintaghist = util.sortdict() |
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288 hextaglines = util.sortdict() |
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289 count = 0 |
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290 |
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291 def dbg(msg): |
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292 ui.debug(b"%s, line %d: %s\n" % (fn, count, msg)) |
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293 |
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294 for nline, line in enumerate(lines): |
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295 count += 1 |
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296 if not line: |
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297 continue |
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298 try: |
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299 (nodehex, name) = line.split(b" ", 1) |
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300 except ValueError: |
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301 dbg(b"cannot parse entry") |
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302 continue |
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303 name = name.strip() |
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304 if recode: |
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305 name = recode(name) |
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306 try: |
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307 nodebin = bin(nodehex) |
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308 except TypeError: |
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309 dbg(b"node '%s' is not well formed" % nodehex) |
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310 continue |
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311 |
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312 # update filetags |
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313 if calcnodelines: |
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314 # map tag name to a list of line numbers |
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315 if name not in hextaglines: |
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316 hextaglines[name] = [] |
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317 hextaglines[name].append([nodehex, nline]) |
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318 continue |
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319 # map tag name to (node, hist) |
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320 if name not in bintaghist: |
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321 bintaghist[name] = [] |
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322 bintaghist[name].append(nodebin) |
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323 return bintaghist, hextaglines |
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324 |
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325 |
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326 def _readtags(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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327 '''Read tag definitions from a file (or any source of lines). |
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328 |
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329 Returns a mapping from tag name to (node, hist). |
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330 |
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331 "node" is the node id from the last line read for that name. "hist" |
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332 is the list of node ids previously associated with it (in file order). |
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333 All node ids are binary, not hex. |
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334 ''' |
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335 filetags, nodelines = _readtaghist( |
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336 ui, repo, lines, fn, recode=recode, calcnodelines=calcnodelines |
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337 ) |
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338 # util.sortdict().__setitem__ is much slower at replacing then inserting |
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339 # new entries. The difference can matter if there are thousands of tags. |
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340 # Create a new sortdict to avoid the performance penalty. |
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341 newtags = util.sortdict() |
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342 for tag, taghist in filetags.items(): |
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343 newtags[tag] = (taghist[-1], taghist[:-1]) |
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344 return newtags |
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345 |
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346 |
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347 def _updatetags(filetags, alltags, tagtype=None, tagtypes=None): |
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348 """Incorporate the tag info read from one file into dictionnaries |
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349 |
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350 The first one, 'alltags', is a "tagmaps" (see 'findglobaltags' for details). |
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351 |
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352 The second one, 'tagtypes', is optional and will be updated to track the |
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353 "tagtype" of entries in the tagmaps. When set, the 'tagtype' argument also |
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354 needs to be set.""" |
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355 if tagtype is None: |
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356 assert tagtypes is None |
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357 |
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358 for name, nodehist in filetags.iteritems(): |
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359 if name not in alltags: |
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360 alltags[name] = nodehist |
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361 if tagtype is not None: |
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362 tagtypes[name] = tagtype |
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363 continue |
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364 |
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365 # we prefer alltags[name] if: |
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366 # it supersedes us OR |
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367 # mutual supersedes and it has a higher rank |
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368 # otherwise we win because we're tip-most |
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369 anode, ahist = nodehist |
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370 bnode, bhist = alltags[name] |
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371 if ( |
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372 bnode != anode |
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373 and anode in bhist |
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374 and (bnode not in ahist or len(bhist) > len(ahist)) |
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375 ): |
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376 anode = bnode |
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377 elif tagtype is not None: |
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378 tagtypes[name] = tagtype |
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379 ahist.extend([n for n in bhist if n not in ahist]) |
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380 alltags[name] = anode, ahist |
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381 |
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382 |
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383 def _filename(repo): |
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384 """name of a tagcache file for a given repo or repoview""" |
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385 filename = b'tags2' |
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386 if repo.filtername: |
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387 filename = b'%s-%s' % (filename, repo.filtername) |
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388 return filename |
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389 |
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390 |
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391 def _readtagcache(ui, repo): |
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392 '''Read the tag cache. |
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393 |
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394 Returns a tuple (heads, fnodes, validinfo, cachetags, shouldwrite). |
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395 |
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396 If the cache is completely up-to-date, "cachetags" is a dict of the |
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397 form returned by _readtags() and "heads", "fnodes", and "validinfo" are |
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398 None and "shouldwrite" is False. |
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399 |
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400 If the cache is not up to date, "cachetags" is None. "heads" is a list |
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401 of all heads currently in the repository, ordered from tip to oldest. |
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402 "validinfo" is a tuple describing cache validation info. This is used |
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403 when writing the tags cache. "fnodes" is a mapping from head to .hgtags |
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404 filenode. "shouldwrite" is True. |
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405 |
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406 If the cache is not up to date, the caller is responsible for reading tag |
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407 info from each returned head. (See findglobaltags().) |
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408 ''' |
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409 try: |
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410 cachefile = repo.cachevfs(_filename(repo), b'r') |
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411 # force reading the file for static-http |
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412 cachelines = iter(cachefile) |
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413 except IOError: |
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414 cachefile = None |
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415 |
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416 cacherev = None |
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417 cachenode = None |
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418 cachehash = None |
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419 if cachefile: |
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420 try: |
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421 validline = next(cachelines) |
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422 validline = validline.split() |
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423 cacherev = int(validline[0]) |
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424 cachenode = bin(validline[1]) |
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425 if len(validline) > 2: |
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426 cachehash = bin(validline[2]) |
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427 except Exception: |
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428 # corruption of the cache, just recompute it. |
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429 pass |
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430 |
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431 tipnode = repo.changelog.tip() |
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432 tiprev = len(repo.changelog) - 1 |
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433 |
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434 # Case 1 (common): tip is the same, so nothing has changed. |
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435 # (Unchanged tip trivially means no changesets have been added. |
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436 # But, thanks to localrepository.destroyed(), it also means none |
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437 # have been destroyed by strip or rollback.) |
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438 if ( |
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439 cacherev == tiprev |
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440 and cachenode == tipnode |
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441 and cachehash == scmutil.filteredhash(repo, tiprev) |
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442 ): |
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443 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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444 cachefile.close() |
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445 return (None, None, None, tags, False) |
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446 if cachefile: |
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447 cachefile.close() # ignore rest of file |
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448 |
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449 valid = (tiprev, tipnode, scmutil.filteredhash(repo, tiprev)) |
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450 |
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451 repoheads = repo.heads() |
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452 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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453 # writing an empty cache. |
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454 if repoheads == [nullid]: |
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455 return ([], {}, valid, {}, False) |
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456 |
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457 # Case 3 (uncommon): cache file missing or empty. |
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458 |
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459 # Case 4 (uncommon): tip rev decreased. This should only happen |
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460 # when we're called from localrepository.destroyed(). Refresh the |
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461 # cache so future invocations will not see disappeared heads in the |
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462 # cache. |
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463 |
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464 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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465 |
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466 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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467 |
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468 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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469 # exposed". |
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470 if not len(repo.file(b'.hgtags')): |
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471 # No tags have ever been committed, so we can avoid a |
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472 # potentially expensive search. |
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473 return ([], {}, valid, None, True) |
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474 |
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475 # Now we have to lookup the .hgtags filenode for every new head. |
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476 # This is the most expensive part of finding tags, so performance |
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477 # depends primarily on the size of newheads. Worst case: no cache |
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478 # file, so newheads == repoheads. |
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479 # Reversed order helps the cache ('repoheads' is in descending order) |
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480 cachefnode = _getfnodes(ui, repo, reversed(repoheads)) |
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481 |
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482 # Caller has to iterate over all heads, but can use the filenodes in |
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483 # cachefnode to get to each .hgtags revision quickly. |
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484 return (repoheads, cachefnode, valid, None, True) |
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485 |
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486 |
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487 def _getfnodes(ui, repo, nodes): |
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488 """return .hgtags fnodes for a list of changeset nodes |
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489 |
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490 Return value is a {node: fnode} mapping. There will be no entry for nodes |
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491 without a '.hgtags' file. |
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492 """ |
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493 starttime = util.timer() |
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494 fnodescache = hgtagsfnodescache(repo.unfiltered()) |
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495 cachefnode = {} |
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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 != nullid: |
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499 cachefnode[node] = fnode |
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500 |
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501 fnodescache.write() |
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502 |
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503 duration = util.timer() - starttime |
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504 ui.log( |
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505 b'tagscache', |
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506 b'%d/%d cache hits/lookups in %0.4f seconds\n', |
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507 fnodescache.hitcount, |
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508 fnodescache.lookupcount, |
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509 duration, |
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510 ) |
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511 return cachefnode |
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512 |
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513 |
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514 def _writetagcache(ui, repo, valid, cachetags): |
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515 filename = _filename(repo) |
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516 try: |
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517 cachefile = repo.cachevfs(filename, b'w', atomictemp=True) |
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518 except (OSError, IOError): |
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519 return |
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520 |
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521 ui.log( |
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522 b'tagscache', |
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523 b'writing .hg/cache/%s with %d tags\n', |
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524 filename, |
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525 len(cachetags), |
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526 ) |
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527 |
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528 if valid[2]: |
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529 cachefile.write( |
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530 b'%d %s %s\n' % (valid[0], hex(valid[1]), hex(valid[2])) |
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531 ) |
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532 else: |
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533 cachefile.write(b'%d %s\n' % (valid[0], hex(valid[1]))) |
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534 |
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535 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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536 # we keep them in UTF-8 throughout this module. If we converted |
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537 # them local encoding on input, we would lose info writing them to |
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538 # the cache. |
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539 for (name, (node, hist)) in sorted(cachetags.iteritems()): |
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540 for n in hist: |
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541 cachefile.write(b"%s %s\n" % (hex(n), name)) |
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542 cachefile.write(b"%s %s\n" % (hex(node), name)) |
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543 |
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544 try: |
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545 cachefile.close() |
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546 except (OSError, IOError): |
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547 pass |
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548 |
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549 |
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550 def tag(repo, names, node, message, local, user, date, editor=False): |
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551 '''tag a revision with one or more symbolic names. |
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552 |
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553 names is a list of strings or, when adding a single tag, names may be a |
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554 string. |
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555 |
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556 if local is True, the tags are stored in a per-repository file. |
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557 otherwise, they are stored in the .hgtags file, and a new |
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558 changeset is committed with the change. |
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559 |
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560 keyword arguments: |
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561 |
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562 local: whether to store tags in non-version-controlled file |
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563 (default False) |
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564 |
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565 message: commit message to use if committing |
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566 |
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567 user: name of user to use if committing |
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568 |
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569 date: date tuple to use if committing''' |
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570 |
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571 if not local: |
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572 m = matchmod.exact([b'.hgtags']) |
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573 if any(repo.status(match=m, unknown=True, ignored=True)): |
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574 raise error.Abort( |
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575 _(b'working copy of .hgtags is changed'), |
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576 hint=_(b'please commit .hgtags manually'), |
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577 ) |
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578 |
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579 with repo.wlock(): |
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580 repo.tags() # instantiate the cache |
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581 _tag(repo, names, node, message, local, user, date, editor=editor) |
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582 |
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583 |
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584 def _tag( |
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585 repo, names, node, message, local, user, date, extra=None, editor=False |
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586 ): |
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587 if isinstance(names, bytes): |
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588 names = (names,) |
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589 |
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590 branches = repo.branchmap() |
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591 for name in names: |
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592 repo.hook(b'pretag', throw=True, node=hex(node), tag=name, local=local) |
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593 if name in branches: |
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594 repo.ui.warn( |
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595 _(b"warning: tag %s conflicts with existing" b" branch name\n") |
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596 % name |
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597 ) |
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598 |
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599 def writetags(fp, names, munge, prevtags): |
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600 fp.seek(0, io.SEEK_END) |
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601 if prevtags and not prevtags.endswith(b'\n'): |
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602 fp.write(b'\n') |
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603 for name in names: |
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604 if munge: |
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605 m = munge(name) |
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606 else: |
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607 m = name |
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608 |
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609 if repo._tagscache.tagtypes and name in repo._tagscache.tagtypes: |
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610 old = repo.tags().get(name, nullid) |
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611 fp.write(b'%s %s\n' % (hex(old), m)) |
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612 fp.write(b'%s %s\n' % (hex(node), m)) |
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613 fp.close() |
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614 |
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615 prevtags = b'' |
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616 if local: |
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617 try: |
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618 fp = repo.vfs(b'localtags', b'r+') |
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619 except IOError: |
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620 fp = repo.vfs(b'localtags', b'a') |
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621 else: |
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622 prevtags = fp.read() |
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623 |
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624 # local tags are stored in the current charset |
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625 writetags(fp, names, None, prevtags) |
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626 for name in names: |
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627 repo.hook(b'tag', node=hex(node), tag=name, local=local) |
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628 return |
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629 |
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630 try: |
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631 fp = repo.wvfs(b'.hgtags', b'rb+') |
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632 except IOError as e: |
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633 if e.errno != errno.ENOENT: |
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634 raise |
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635 fp = repo.wvfs(b'.hgtags', b'ab') |
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636 else: |
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637 prevtags = fp.read() |
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638 |
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639 # committed tags are stored in UTF-8 |
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640 writetags(fp, names, encoding.fromlocal, prevtags) |
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641 |
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642 fp.close() |
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643 |
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644 repo.invalidatecaches() |
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645 |
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646 if b'.hgtags' not in repo.dirstate: |
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647 repo[None].add([b'.hgtags']) |
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648 |
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649 m = matchmod.exact([b'.hgtags']) |
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650 tagnode = repo.commit( |
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651 message, user, date, extra=extra, match=m, editor=editor |
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652 ) |
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653 |
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654 for name in names: |
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655 repo.hook(b'tag', node=hex(node), tag=name, local=local) |
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656 |
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657 return tagnode |
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658 |
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659 |
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660 _fnodescachefile = b'hgtagsfnodes1' |
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661 _fnodesrecsize = 4 + 20 # changeset fragment + filenode |
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662 _fnodesmissingrec = b'\xff' * 24 |
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663 |
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664 |
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665 class hgtagsfnodescache(object): |
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666 """Persistent cache mapping revisions to .hgtags filenodes. |
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667 |
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668 The cache is an array of records. Each item in the array corresponds to |
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669 a changelog revision. Values in the array contain the first 4 bytes of |
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670 the node hash and the 20 bytes .hgtags filenode for that revision. |
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671 |
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672 The first 4 bytes are present as a form of verification. Repository |
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673 stripping and rewriting may change the node at a numeric revision in the |
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674 changelog. The changeset fragment serves as a verifier to detect |
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675 rewriting. This logic is shared with the rev branch cache (see |
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676 branchmap.py). |
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677 |
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678 The instance holds in memory the full cache content but entries are |
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679 only parsed on read. |
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680 |
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681 Instances behave like lists. ``c[i]`` works where i is a rev or |
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682 changeset node. Missing indexes are populated automatically on access. |
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683 """ |
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684 |
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685 def __init__(self, repo): |
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686 assert repo.filtername is None |
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687 |
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688 self._repo = repo |
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689 |
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690 # Only for reporting purposes. |
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691 self.lookupcount = 0 |
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692 self.hitcount = 0 |
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693 |
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694 try: |
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695 data = repo.cachevfs.read(_fnodescachefile) |
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696 except (OSError, IOError): |
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697 data = b"" |
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698 self._raw = bytearray(data) |
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699 |
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700 # The end state of self._raw is an array that is of the exact length |
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701 # required to hold a record for every revision in the repository. |
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702 # We truncate or extend the array as necessary. self._dirtyoffset is |
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703 # defined to be the start offset at which we need to write the output |
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704 # file. This offset is also adjusted when new entries are calculated |
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705 # for array members. |
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706 cllen = len(repo.changelog) |
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707 wantedlen = cllen * _fnodesrecsize |
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708 rawlen = len(self._raw) |
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709 |
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710 self._dirtyoffset = None |
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711 |
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712 if rawlen < wantedlen: |
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713 self._dirtyoffset = rawlen |
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714 self._raw.extend(b'\xff' * (wantedlen - rawlen)) |
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715 elif rawlen > wantedlen: |
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716 # There's no easy way to truncate array instances. This seems |
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717 # slightly less evil than copying a potentially large array slice. |
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718 for i in range(rawlen - wantedlen): |
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719 self._raw.pop() |
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720 self._dirtyoffset = len(self._raw) |
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721 |
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722 def getfnode(self, node, computemissing=True): |
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723 """Obtain the filenode of the .hgtags file at a specified revision. |
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724 |
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725 If the value is in the cache, the entry will be validated and returned. |
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726 Otherwise, the filenode will be computed and returned unless |
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727 "computemissing" is False, in which case None will be returned without |
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728 any potentially expensive computation being performed. |
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729 |
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730 If an .hgtags does not exist at the specified revision, nullid is |
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731 returned. |
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732 """ |
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733 if node == nullid: |
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734 return nullid |
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735 |
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736 ctx = self._repo[node] |
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737 rev = ctx.rev() |
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738 |
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739 self.lookupcount += 1 |
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740 |
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741 offset = rev * _fnodesrecsize |
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742 record = b'%s' % self._raw[offset : offset + _fnodesrecsize] |
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743 properprefix = node[0:4] |
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744 |
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745 # Validate and return existing entry. |
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746 if record != _fnodesmissingrec: |
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747 fileprefix = record[0:4] |
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748 |
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749 if fileprefix == properprefix: |
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750 self.hitcount += 1 |
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751 return record[4:] |
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752 |
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753 # Fall through. |
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754 |
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755 # If we get here, the entry is either missing or invalid. |
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756 |
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757 if not computemissing: |
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758 return None |
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|
759 |
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760 fnode = None |
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761 cl = self._repo.changelog |
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762 p1rev, p2rev = cl._uncheckedparentrevs(rev) |
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763 p1node = cl.node(p1rev) |
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764 p1fnode = self.getfnode(p1node, computemissing=False) |
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765 if p2rev != nullrev: |
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766 # There is some no-merge changeset where p1 is null and p2 is set |
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767 # Processing them as merge is just slower, but still gives a good |
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768 # result. |
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769 p2node = cl.node(p1rev) |
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770 p2fnode = self.getfnode(p2node, computemissing=False) |
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771 if p1fnode != p2fnode: |
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772 # we cannot rely on readfast because we don't know against what |
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773 # parent the readfast delta is computed |
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774 p1fnode = None |
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775 if p1fnode is not None: |
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776 mctx = ctx.manifestctx() |
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777 fnode = mctx.readfast().get(b'.hgtags') |
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|
778 if fnode is None: |
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779 fnode = p1fnode |
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780 if fnode is None: |
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781 # Populate missing entry. |
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782 try: |
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783 fnode = ctx.filenode(b'.hgtags') |
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784 except error.LookupError: |
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785 # No .hgtags file on this revision. |
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786 fnode = nullid |
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787 |
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788 self._writeentry(offset, properprefix, fnode) |
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789 return fnode |
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790 |
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791 def setfnode(self, node, fnode): |
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792 """Set the .hgtags filenode for a given changeset.""" |
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793 assert len(fnode) == 20 |
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794 ctx = self._repo[node] |
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795 |
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796 # Do a lookup first to avoid writing if nothing has changed. |
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797 if self.getfnode(ctx.node(), computemissing=False) == fnode: |
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798 return |
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799 |
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800 self._writeentry(ctx.rev() * _fnodesrecsize, node[0:4], fnode) |
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801 |
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802 def _writeentry(self, offset, prefix, fnode): |
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803 # Slices on array instances only accept other array. |
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804 entry = bytearray(prefix + fnode) |
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805 self._raw[offset : offset + _fnodesrecsize] = entry |
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806 # self._dirtyoffset could be None. |
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807 self._dirtyoffset = min(self._dirtyoffset or 0, offset or 0) |
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808 |
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809 def write(self): |
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810 """Perform all necessary writes to cache file. |
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811 |
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812 This may no-op if no writes are needed or if a write lock could |
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813 not be obtained. |
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814 """ |
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815 if self._dirtyoffset is None: |
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816 return |
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817 |
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818 data = self._raw[self._dirtyoffset :] |
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819 if not data: |
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820 return |
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821 |
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822 repo = self._repo |
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823 |
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824 try: |
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825 lock = repo.wlock(wait=False) |
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826 except error.LockError: |
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827 repo.ui.log( |
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828 b'tagscache', |
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829 b'not writing .hg/cache/%s because ' |
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830 b'lock cannot be acquired\n' % _fnodescachefile, |
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831 ) |
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832 return |
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|
833 |
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834 try: |
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835 f = repo.cachevfs.open(_fnodescachefile, b'ab') |
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836 try: |
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diff
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|
837 # if the file has been truncated |
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|
838 actualoffset = f.tell() |
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|
839 if actualoffset < self._dirtyoffset: |
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|
840 self._dirtyoffset = actualoffset |
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841 data = self._raw[self._dirtyoffset :] |
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842 f.seek(self._dirtyoffset) |
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843 f.truncate() |
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844 repo.ui.log( |
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845 b'tagscache', |
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|
846 b'writing %d bytes to cache/%s\n' |
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847 % (len(data), _fnodescachefile), |
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|
848 ) |
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|
849 f.write(data) |
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|
850 self._dirtyoffset = None |
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|
851 finally: |
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|
852 f.close() |
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|
853 except (IOError, OSError) as inst: |
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|
854 repo.ui.log( |
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855 b'tagscache', |
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|
856 b"couldn't write cache/%s: %s\n" |
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changeset
|
857 % (_fnodescachefile, stringutil.forcebytestr(inst)), |
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|
858 ) |
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|
859 finally: |
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|
860 lock.release() |