Mercurial > hg
annotate mercurial/tags.py @ 32129:f0ea0f642627
py3: make posix.getuser return a bytes
author | Pulkit Goyal <7895pulkit@gmail.com> |
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date | Fri, 21 Apr 2017 00:53:38 +0530 |
parents | e6e1884df298 |
children | 4f3f08262eb4 |
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1 # tags.py - read tag info from local repository |
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2 # |
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3 # Copyright 2009 Matt Mackall <mpm@selenic.com> |
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4 # Copyright 2009 Greg Ward <greg@gerg.ca> |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
10263 | 7 # GNU General Public License version 2 or any later version. |
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8 |
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9 # Currently this module only deals with reading and caching tags. |
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10 # Eventually, it could take care of updating (adding/removing/moving) |
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11 # tags too. |
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12 |
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13 from __future__ import absolute_import |
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14 |
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15 import errno |
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16 |
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17 from .node import ( |
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18 bin, |
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19 hex, |
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20 nullid, |
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21 short, |
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22 ) |
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23 from .i18n import _ |
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24 from . import ( |
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25 encoding, |
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26 error, |
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27 match as matchmod, |
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28 scmutil, |
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29 util, |
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30 ) |
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31 |
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32 # Tags computation can be expensive and caches exist to make it fast in |
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33 # the common case. |
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34 # |
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35 # The "hgtagsfnodes1" cache file caches the .hgtags filenode values for |
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36 # each revision in the repository. The file is effectively an array of |
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37 # fixed length records. Read the docs for "hgtagsfnodescache" for technical |
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38 # details. |
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39 # |
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40 # The .hgtags filenode cache grows in proportion to the length of the |
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41 # changelog. The file is truncated when the # changelog is stripped. |
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42 # |
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43 # The purpose of the filenode cache is to avoid the most expensive part |
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44 # of finding global tags, which is looking up the .hgtags filenode in the |
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45 # manifest for each head. This can take dozens or over 100ms for |
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46 # repositories with very large manifests. Multiplied by dozens or even |
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47 # hundreds of heads and there is a significant performance concern. |
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48 # |
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49 # There also exist a separate cache file for each repository filter. |
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50 # These "tags-*" files store information about the history of tags. |
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51 # |
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52 # The tags cache files consists of a cache validation line followed by |
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53 # a history of tags. |
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54 # |
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55 # The cache validation line has the format: |
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56 # |
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57 # <tiprev> <tipnode> [<filteredhash>] |
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58 # |
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59 # <tiprev> is an integer revision and <tipnode> is a 40 character hex |
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60 # node for that changeset. These redundantly identify the repository |
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61 # tip from the time the cache was written. In addition, <filteredhash>, |
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62 # if present, is a 40 character hex hash of the contents of the filtered |
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63 # revisions for this filter. If the set of filtered revs changes, the |
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64 # hash will change and invalidate the cache. |
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65 # |
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66 # The history part of the tags cache consists of lines of the form: |
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67 # |
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68 # <node> <tag> |
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69 # |
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70 # (This format is identical to that of .hgtags files.) |
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71 # |
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72 # <tag> is the tag name and <node> is the 40 character hex changeset |
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73 # the tag is associated with. |
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74 # |
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75 # Tags are written sorted by tag name. |
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76 # |
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77 # Tags associated with multiple changesets have an entry for each changeset. |
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78 # The most recent changeset (in terms of revlog ordering for the head |
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79 # setting it) for each tag is last. |
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80 |
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81 def fnoderevs(ui, repo, revs): |
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82 """return the list of '.hgtags' fnodes used in a set revisions |
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83 |
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84 This is returned as list of unique fnodes. We use a list instead of a set |
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85 because order matters when it comes to tags.""" |
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86 unfi = repo.unfiltered() |
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87 tonode = unfi.changelog.node |
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88 nodes = [tonode(r) for r in revs] |
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89 fnodes = _getfnodes(ui, repo, nodes[::-1]) # reversed help the cache |
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90 fnodes = _filterfnodes(fnodes, nodes) |
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91 return fnodes |
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92 |
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93 def _nulltonone(value): |
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94 """convert nullid to None |
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95 |
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96 For tag value, nullid means "deleted". This small utility function helps |
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97 translating that to None.""" |
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98 if value == nullid: |
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99 return None |
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100 return value |
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101 |
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102 def difftags(ui, repo, oldfnodes, newfnodes): |
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103 """list differences between tags expressed in two set of file-nodes |
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104 |
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105 The list contains entries in the form: (tagname, oldvalue, new value). |
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106 None is used to expressed missing value: |
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107 ('foo', None, 'abcd') is a new tag, |
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108 ('bar', 'ef01', None) is a deletion, |
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109 ('baz', 'abcd', 'ef01') is a tag movement. |
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110 """ |
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111 if oldfnodes == newfnodes: |
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112 return [] |
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113 oldtags = _tagsfromfnodes(ui, repo, oldfnodes) |
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114 newtags = _tagsfromfnodes(ui, repo, newfnodes) |
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115 |
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116 # list of (tag, old, new): None means missing |
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117 entries = [] |
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118 for tag, (new, __) in newtags.items(): |
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119 new = _nulltonone(new) |
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120 old, __ = oldtags.pop(tag, (None, None)) |
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121 old = _nulltonone(old) |
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122 if old != new: |
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123 entries.append((tag, old, new)) |
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124 # handle deleted tags |
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125 for tag, (old, __) in oldtags.items(): |
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126 old = _nulltonone(old) |
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127 if old is not None: |
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128 entries.append((tag, old, None)) |
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129 entries.sort() |
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130 return entries |
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131 |
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132 def writediff(fp, difflist): |
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133 """write tags diff information to a file. |
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134 |
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135 Data are stored with a line based format: |
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136 |
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137 <action> <hex-node> <tag-name>\n |
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138 |
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139 Action are defined as follow: |
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140 -R tag is removed, |
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141 +A tag is added, |
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142 -M tag is moved (old value), |
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143 +M tag is moved (new value), |
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144 |
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145 Example: |
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146 |
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147 +A 875517b4806a848f942811a315a5bce30804ae85 t5 |
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148 |
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149 See documentation of difftags output for details about the input. |
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150 """ |
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151 add = '+A %s %s\n' |
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152 remove = '-R %s %s\n' |
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153 updateold = '-M %s %s\n' |
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154 updatenew = '+M %s %s\n' |
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155 for tag, old, new in difflist: |
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156 # translate to hex |
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157 if old is not None: |
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158 old = hex(old) |
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159 if new is not None: |
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160 new = hex(new) |
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161 # write to file |
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162 if old is None: |
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163 fp.write(add % (new, tag)) |
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164 elif new is None: |
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165 fp.write(remove % (old, tag)) |
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166 else: |
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167 fp.write(updateold % (old, tag)) |
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168 fp.write(updatenew % (new, tag)) |
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169 |
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170 def findglobaltags(ui, repo): |
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171 '''Find global tags in a repo: return a tagsmap |
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172 |
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173 tagsmap: tag name to (node, hist) 2-tuples. |
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174 |
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175 The tags cache is read and updated as a side-effect of calling. |
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176 ''' |
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177 (heads, tagfnode, valid, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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178 if cachetags is not None: |
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179 assert not shouldwrite |
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180 # XXX is this really 100% correct? are there oddball special |
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181 # cases where a global tag should outrank a local tag but won't, |
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182 # because cachetags does not contain rank info? |
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183 alltags = {} |
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184 _updatetags(cachetags, alltags) |
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185 return alltags |
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186 |
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187 for head in reversed(heads): # oldest to newest |
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188 assert head in repo.changelog.nodemap, \ |
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189 "tag cache returned bogus head %s" % short(head) |
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190 fnodes = _filterfnodes(tagfnode, reversed(heads)) |
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191 alltags = _tagsfromfnodes(ui, repo, fnodes) |
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192 |
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193 # and update the cache (if necessary) |
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194 if shouldwrite: |
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195 _writetagcache(ui, repo, valid, alltags) |
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196 return alltags |
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197 |
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198 def _filterfnodes(tagfnode, nodes): |
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199 """return a list of unique fnodes |
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200 |
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201 The order of this list matches the order of "nodes". Preserving this order |
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202 is important as reading tags in different order provides different |
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203 results.""" |
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204 seen = set() # set of fnode |
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205 fnodes = [] |
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206 for no in nodes: # oldest to newest |
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207 fnode = tagfnode.get(no) |
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208 if fnode and fnode not in seen: |
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209 seen.add(fnode) |
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210 fnodes.append(fnode) |
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211 return fnodes |
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212 |
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213 def _tagsfromfnodes(ui, repo, fnodes): |
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214 """return a tagsmap from a list of file-node |
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215 |
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216 tagsmap: tag name to (node, hist) 2-tuples. |
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217 |
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218 The order of the list matters.""" |
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219 alltags = {} |
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220 fctx = None |
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221 for fnode in fnodes: |
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222 if fctx is None: |
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223 fctx = repo.filectx('.hgtags', fileid=fnode) |
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224 else: |
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225 fctx = fctx.filectx(fnode) |
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226 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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227 _updatetags(filetags, alltags) |
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228 return alltags |
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229 |
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230 def readlocaltags(ui, repo, alltags, tagtypes): |
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231 '''Read local tags in repo. Update alltags and tagtypes.''' |
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232 try: |
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233 data = repo.vfs.read("localtags") |
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234 except IOError as inst: |
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235 if inst.errno != errno.ENOENT: |
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236 raise |
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237 return |
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238 |
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239 # localtags is in the local encoding; re-encode to UTF-8 on |
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240 # input for consistency with the rest of this module. |
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241 filetags = _readtags( |
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242 ui, repo, data.splitlines(), "localtags", |
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243 recode=encoding.fromlocal) |
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244 |
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245 # remove tags pointing to invalid nodes |
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246 cl = repo.changelog |
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247 for t in filetags.keys(): |
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248 try: |
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249 cl.rev(filetags[t][0]) |
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250 except (LookupError, ValueError): |
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251 del filetags[t] |
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252 |
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253 _updatetags(filetags, alltags, 'local', tagtypes) |
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254 |
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255 def _readtaghist(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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256 '''Read tag definitions from a file (or any source of lines). |
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257 |
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258 This function returns two sortdicts with similar information: |
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259 |
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260 - the first dict, bintaghist, contains the tag information as expected by |
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261 the _readtags function, i.e. a mapping from tag name to (node, hist): |
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262 - node is the node id from the last line read for that name, |
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263 - hist is the list of node ids previously associated with it (in file |
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264 order). All node ids are binary, not hex. |
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265 |
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266 - the second dict, hextaglines, is a mapping from tag name to a list of |
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267 [hexnode, line number] pairs, ordered from the oldest to the newest node. |
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268 |
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269 When calcnodelines is False the hextaglines dict is not calculated (an |
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270 empty dict is returned). This is done to improve this function's |
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271 performance in cases where the line numbers are not needed. |
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272 ''' |
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273 |
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274 bintaghist = util.sortdict() |
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275 hextaglines = util.sortdict() |
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276 count = 0 |
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277 |
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278 def dbg(msg): |
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279 ui.debug("%s, line %s: %s\n" % (fn, count, msg)) |
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280 |
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281 for nline, line in enumerate(lines): |
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282 count += 1 |
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283 if not line: |
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284 continue |
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285 try: |
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286 (nodehex, name) = line.split(" ", 1) |
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287 except ValueError: |
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288 dbg("cannot parse entry") |
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289 continue |
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290 name = name.strip() |
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291 if recode: |
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292 name = recode(name) |
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293 try: |
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294 nodebin = bin(nodehex) |
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295 except TypeError: |
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296 dbg("node '%s' is not well formed" % nodehex) |
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297 continue |
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298 |
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299 # update filetags |
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300 if calcnodelines: |
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301 # map tag name to a list of line numbers |
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302 if name not in hextaglines: |
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303 hextaglines[name] = [] |
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304 hextaglines[name].append([nodehex, nline]) |
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305 continue |
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306 # map tag name to (node, hist) |
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307 if name not in bintaghist: |
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308 bintaghist[name] = [] |
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309 bintaghist[name].append(nodebin) |
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310 return bintaghist, hextaglines |
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311 |
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312 def _readtags(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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313 '''Read tag definitions from a file (or any source of lines). |
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314 |
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315 Returns a mapping from tag name to (node, hist). |
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316 |
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317 "node" is the node id from the last line read for that name. "hist" |
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318 is the list of node ids previously associated with it (in file order). |
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319 All node ids are binary, not hex. |
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320 ''' |
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321 filetags, nodelines = _readtaghist(ui, repo, lines, fn, recode=recode, |
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322 calcnodelines=calcnodelines) |
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323 # util.sortdict().__setitem__ is much slower at replacing then inserting |
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324 # new entries. The difference can matter if there are thousands of tags. |
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325 # Create a new sortdict to avoid the performance penalty. |
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326 newtags = util.sortdict() |
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327 for tag, taghist in filetags.items(): |
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328 newtags[tag] = (taghist[-1], taghist[:-1]) |
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329 return newtags |
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330 |
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331 def _updatetags(filetags, alltags, tagtype=None, tagtypes=None): |
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332 """Incorporate the tag info read from one file into dictionnaries |
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333 |
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334 The first one, 'alltags', is a "tagmaps" (see 'findglobaltags' for details). |
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335 |
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336 The second one, 'tagtypes', is optional and will be updated to track the |
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337 "tagtype" of entries in the tagmaps. When set, the 'tagtype' argument also |
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338 needs to be set.""" |
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339 if tagtype is None: |
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340 assert tagtypes is None |
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341 |
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342 for name, nodehist in filetags.iteritems(): |
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343 if name not in alltags: |
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344 alltags[name] = nodehist |
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345 if tagtype is not None: |
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346 tagtypes[name] = tagtype |
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347 continue |
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348 |
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349 # we prefer alltags[name] if: |
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350 # it supersedes us OR |
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351 # mutual supersedes and it has a higher rank |
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352 # otherwise we win because we're tip-most |
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353 anode, ahist = nodehist |
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354 bnode, bhist = alltags[name] |
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355 if (bnode != anode and anode in bhist and |
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356 (bnode not in ahist or len(bhist) > len(ahist))): |
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357 anode = bnode |
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358 elif tagtype is not None: |
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359 tagtypes[name] = tagtype |
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360 ahist.extend([n for n in bhist if n not in ahist]) |
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361 alltags[name] = anode, ahist |
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362 |
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363 def _filename(repo): |
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364 """name of a tagcache file for a given repo or repoview""" |
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365 filename = 'cache/tags2' |
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366 if repo.filtername: |
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367 filename = '%s-%s' % (filename, repo.filtername) |
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368 return filename |
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369 |
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370 def _readtagcache(ui, repo): |
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371 '''Read the tag cache. |
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372 |
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373 Returns a tuple (heads, fnodes, validinfo, cachetags, shouldwrite). |
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374 |
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375 If the cache is completely up-to-date, "cachetags" is a dict of the |
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376 form returned by _readtags() and "heads", "fnodes", and "validinfo" are |
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377 None and "shouldwrite" is False. |
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378 |
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379 If the cache is not up to date, "cachetags" is None. "heads" is a list |
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380 of all heads currently in the repository, ordered from tip to oldest. |
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381 "validinfo" is a tuple describing cache validation info. This is used |
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382 when writing the tags cache. "fnodes" is a mapping from head to .hgtags |
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383 filenode. "shouldwrite" is True. |
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384 |
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385 If the cache is not up to date, the caller is responsible for reading tag |
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386 info from each returned head. (See findglobaltags().) |
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387 ''' |
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388 try: |
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389 cachefile = repo.vfs(_filename(repo), 'r') |
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390 # force reading the file for static-http |
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391 cachelines = iter(cachefile) |
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392 except IOError: |
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393 cachefile = None |
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394 |
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395 cacherev = None |
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396 cachenode = None |
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397 cachehash = None |
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398 if cachefile: |
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399 try: |
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400 validline = next(cachelines) |
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401 validline = validline.split() |
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402 cacherev = int(validline[0]) |
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403 cachenode = bin(validline[1]) |
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404 if len(validline) > 2: |
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405 cachehash = bin(validline[2]) |
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406 except Exception: |
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407 # corruption of the cache, just recompute it. |
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408 pass |
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409 |
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410 tipnode = repo.changelog.tip() |
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411 tiprev = len(repo.changelog) - 1 |
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412 |
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413 # Case 1 (common): tip is the same, so nothing has changed. |
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414 # (Unchanged tip trivially means no changesets have been added. |
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415 # But, thanks to localrepository.destroyed(), it also means none |
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416 # have been destroyed by strip or rollback.) |
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417 if (cacherev == tiprev |
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418 and cachenode == tipnode |
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419 and cachehash == scmutil.filteredhash(repo, tiprev)): |
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420 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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421 cachefile.close() |
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422 return (None, None, None, tags, False) |
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423 if cachefile: |
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424 cachefile.close() # ignore rest of file |
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425 |
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426 valid = (tiprev, tipnode, scmutil.filteredhash(repo, tiprev)) |
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427 |
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428 repoheads = repo.heads() |
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429 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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430 # writing an empty cache. |
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431 if repoheads == [nullid]: |
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432 return ([], {}, valid, {}, False) |
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433 |
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434 # Case 3 (uncommon): cache file missing or empty. |
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435 |
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436 # Case 4 (uncommon): tip rev decreased. This should only happen |
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437 # when we're called from localrepository.destroyed(). Refresh the |
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438 # cache so future invocations will not see disappeared heads in the |
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439 # cache. |
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440 |
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441 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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442 |
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443 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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444 |
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445 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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446 # exposed". |
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447 if not len(repo.file('.hgtags')): |
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448 # No tags have ever been committed, so we can avoid a |
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449 # potentially expensive search. |
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450 return ([], {}, valid, None, True) |
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451 |
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452 |
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453 # Now we have to lookup the .hgtags filenode for every new head. |
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454 # This is the most expensive part of finding tags, so performance |
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455 # depends primarily on the size of newheads. Worst case: no cache |
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456 # file, so newheads == repoheads. |
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457 cachefnode = _getfnodes(ui, repo, repoheads) |
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458 |
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459 # Caller has to iterate over all heads, but can use the filenodes in |
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460 # cachefnode to get to each .hgtags revision quickly. |
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461 return (repoheads, cachefnode, valid, None, True) |
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462 |
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463 def _getfnodes(ui, repo, nodes): |
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464 """return .hgtags fnodes for a list of changeset nodes |
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465 |
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466 Return value is a {node: fnode} mapping. There will be no entry for nodes |
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467 without a '.hgtags' file. |
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468 """ |
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469 starttime = util.timer() |
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470 fnodescache = hgtagsfnodescache(repo.unfiltered()) |
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471 cachefnode = {} |
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472 for node in reversed(nodes): |
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473 fnode = fnodescache.getfnode(node) |
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474 if fnode != nullid: |
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475 cachefnode[node] = fnode |
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476 |
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477 fnodescache.write() |
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478 |
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479 duration = util.timer() - starttime |
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480 ui.log('tagscache', |
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481 '%d/%d cache hits/lookups in %0.4f ' |
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482 'seconds\n', |
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483 fnodescache.hitcount, fnodescache.lookupcount, duration) |
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484 return cachefnode |
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485 |
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486 def _writetagcache(ui, repo, valid, cachetags): |
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487 filename = _filename(repo) |
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488 try: |
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489 cachefile = repo.vfs(filename, 'w', atomictemp=True) |
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490 except (OSError, IOError): |
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491 return |
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492 |
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493 ui.log('tagscache', 'writing .hg/%s with %d tags\n', |
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494 filename, len(cachetags)) |
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495 |
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496 if valid[2]: |
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497 cachefile.write('%d %s %s\n' % (valid[0], hex(valid[1]), hex(valid[2]))) |
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498 else: |
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499 cachefile.write('%d %s\n' % (valid[0], hex(valid[1]))) |
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500 |
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501 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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502 # we keep them in UTF-8 throughout this module. If we converted |
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503 # them local encoding on input, we would lose info writing them to |
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504 # the cache. |
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505 for (name, (node, hist)) in sorted(cachetags.iteritems()): |
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506 for n in hist: |
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507 cachefile.write("%s %s\n" % (hex(n), name)) |
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508 cachefile.write("%s %s\n" % (hex(node), name)) |
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509 |
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510 try: |
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511 cachefile.close() |
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512 except (OSError, IOError): |
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513 pass |
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514 |
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515 def tag(repo, names, node, message, local, user, date, editor=False): |
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516 '''tag a revision with one or more symbolic names. |
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517 |
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518 names is a list of strings or, when adding a single tag, names may be a |
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519 string. |
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520 |
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521 if local is True, the tags are stored in a per-repository file. |
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522 otherwise, they are stored in the .hgtags file, and a new |
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523 changeset is committed with the change. |
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524 |
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525 keyword arguments: |
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526 |
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527 local: whether to store tags in non-version-controlled file |
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528 (default False) |
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529 |
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530 message: commit message to use if committing |
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531 |
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532 user: name of user to use if committing |
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533 |
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534 date: date tuple to use if committing''' |
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535 |
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536 if not local: |
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537 m = matchmod.exact(repo.root, '', ['.hgtags']) |
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538 if any(repo.status(match=m, unknown=True, ignored=True)): |
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539 raise error.Abort(_('working copy of .hgtags is changed'), |
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540 hint=_('please commit .hgtags manually')) |
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541 |
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542 repo.tags() # instantiate the cache |
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543 _tag(repo.unfiltered(), names, node, message, local, user, date, |
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544 editor=editor) |
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545 |
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546 def _tag(repo, names, node, message, local, user, date, extra=None, |
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547 editor=False): |
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548 if isinstance(names, str): |
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549 names = (names,) |
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550 |
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551 branches = repo.branchmap() |
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552 for name in names: |
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553 repo.hook('pretag', throw=True, node=hex(node), tag=name, |
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554 local=local) |
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555 if name in branches: |
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556 repo.ui.warn(_("warning: tag %s conflicts with existing" |
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557 " branch name\n") % name) |
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558 |
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559 def writetags(fp, names, munge, prevtags): |
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560 fp.seek(0, 2) |
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561 if prevtags and prevtags[-1] != '\n': |
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562 fp.write('\n') |
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563 for name in names: |
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564 if munge: |
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565 m = munge(name) |
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566 else: |
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567 m = name |
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568 |
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569 if (repo._tagscache.tagtypes and |
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570 name in repo._tagscache.tagtypes): |
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571 old = repo.tags().get(name, nullid) |
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572 fp.write('%s %s\n' % (hex(old), m)) |
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573 fp.write('%s %s\n' % (hex(node), m)) |
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574 fp.close() |
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575 |
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576 prevtags = '' |
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577 if local: |
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578 try: |
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579 fp = repo.vfs('localtags', 'r+') |
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580 except IOError: |
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581 fp = repo.vfs('localtags', 'a') |
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582 else: |
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583 prevtags = fp.read() |
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584 |
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585 # local tags are stored in the current charset |
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586 writetags(fp, names, None, prevtags) |
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587 for name in names: |
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588 repo.hook('tag', node=hex(node), tag=name, local=local) |
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589 return |
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590 |
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591 try: |
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592 fp = repo.wvfs('.hgtags', 'rb+') |
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593 except IOError as e: |
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594 if e.errno != errno.ENOENT: |
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595 raise |
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596 fp = repo.wvfs('.hgtags', 'ab') |
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597 else: |
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598 prevtags = fp.read() |
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599 |
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600 # committed tags are stored in UTF-8 |
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601 writetags(fp, names, encoding.fromlocal, prevtags) |
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602 |
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603 fp.close() |
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604 |
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605 repo.invalidatecaches() |
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606 |
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607 if '.hgtags' not in repo.dirstate: |
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608 repo[None].add(['.hgtags']) |
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609 |
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610 m = matchmod.exact(repo.root, '', ['.hgtags']) |
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611 tagnode = repo.commit(message, user, date, extra=extra, match=m, |
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612 editor=editor) |
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613 |
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614 for name in names: |
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615 repo.hook('tag', node=hex(node), tag=name, local=local) |
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616 |
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617 return tagnode |
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618 |
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619 _fnodescachefile = 'cache/hgtagsfnodes1' |
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620 _fnodesrecsize = 4 + 20 # changeset fragment + filenode |
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621 _fnodesmissingrec = '\xff' * 24 |
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622 |
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623 class hgtagsfnodescache(object): |
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624 """Persistent cache mapping revisions to .hgtags filenodes. |
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625 |
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626 The cache is an array of records. Each item in the array corresponds to |
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627 a changelog revision. Values in the array contain the first 4 bytes of |
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628 the node hash and the 20 bytes .hgtags filenode for that revision. |
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629 |
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630 The first 4 bytes are present as a form of verification. Repository |
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631 stripping and rewriting may change the node at a numeric revision in the |
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632 changelog. The changeset fragment serves as a verifier to detect |
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633 rewriting. This logic is shared with the rev branch cache (see |
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634 branchmap.py). |
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635 |
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636 The instance holds in memory the full cache content but entries are |
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637 only parsed on read. |
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638 |
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639 Instances behave like lists. ``c[i]`` works where i is a rev or |
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640 changeset node. Missing indexes are populated automatically on access. |
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641 """ |
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642 def __init__(self, repo): |
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643 assert repo.filtername is None |
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644 |
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645 self._repo = repo |
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646 |
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647 # Only for reporting purposes. |
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648 self.lookupcount = 0 |
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649 self.hitcount = 0 |
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650 |
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651 |
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652 try: |
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653 data = repo.vfs.read(_fnodescachefile) |
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654 except (OSError, IOError): |
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655 data = "" |
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656 self._raw = bytearray(data) |
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657 |
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658 # The end state of self._raw is an array that is of the exact length |
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659 # required to hold a record for every revision in the repository. |
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660 # We truncate or extend the array as necessary. self._dirtyoffset is |
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661 # defined to be the start offset at which we need to write the output |
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662 # file. This offset is also adjusted when new entries are calculated |
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663 # for array members. |
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664 cllen = len(repo.changelog) |
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665 wantedlen = cllen * _fnodesrecsize |
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666 rawlen = len(self._raw) |
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667 |
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668 self._dirtyoffset = None |
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669 |
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670 if rawlen < wantedlen: |
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671 self._dirtyoffset = rawlen |
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672 self._raw.extend('\xff' * (wantedlen - rawlen)) |
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673 elif rawlen > wantedlen: |
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674 # There's no easy way to truncate array instances. This seems |
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675 # slightly less evil than copying a potentially large array slice. |
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676 for i in range(rawlen - wantedlen): |
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677 self._raw.pop() |
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678 self._dirtyoffset = len(self._raw) |
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679 |
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680 def getfnode(self, node, computemissing=True): |
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681 """Obtain the filenode of the .hgtags file at a specified revision. |
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682 |
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683 If the value is in the cache, the entry will be validated and returned. |
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684 Otherwise, the filenode will be computed and returned unless |
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685 "computemissing" is False, in which case None will be returned without |
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686 any potentially expensive computation being performed. |
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687 |
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688 If an .hgtags does not exist at the specified revision, nullid is |
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689 returned. |
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690 """ |
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691 ctx = self._repo[node] |
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692 rev = ctx.rev() |
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693 |
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694 self.lookupcount += 1 |
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695 |
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696 offset = rev * _fnodesrecsize |
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697 record = '%s' % self._raw[offset:offset + _fnodesrecsize] |
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698 properprefix = node[0:4] |
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|
699 |
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700 # Validate and return existing entry. |
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701 if record != _fnodesmissingrec: |
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702 fileprefix = record[0:4] |
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|
703 |
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|
704 if fileprefix == properprefix: |
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705 self.hitcount += 1 |
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706 return record[4:] |
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|
707 |
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|
708 # Fall through. |
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|
709 |
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|
710 # If we get here, the entry is either missing or invalid. |
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|
711 |
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|
712 if not computemissing: |
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|
713 return None |
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|
714 |
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|
715 # Populate missing entry. |
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716 try: |
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|
717 fnode = ctx.filenode('.hgtags') |
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|
718 except error.LookupError: |
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|
719 # No .hgtags file on this revision. |
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|
720 fnode = nullid |
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|
721 |
25381
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changeset
|
722 self._writeentry(offset, properprefix, fnode) |
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|
723 return fnode |
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diff
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|
724 |
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|
725 def setfnode(self, node, fnode): |
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|
726 """Set the .hgtags filenode for a given changeset.""" |
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|
727 assert len(fnode) == 20 |
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|
728 ctx = self._repo[node] |
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|
729 |
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changeset
|
730 # Do a lookup first to avoid writing if nothing has changed. |
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diff
changeset
|
731 if self.getfnode(ctx.node(), computemissing=False) == fnode: |
47edeff19139
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changeset
|
732 return |
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changeset
|
733 |
47edeff19139
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|
734 self._writeentry(ctx.rev() * _fnodesrecsize, node[0:4], fnode) |
47edeff19139
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diff
changeset
|
735 |
47edeff19139
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diff
changeset
|
736 def _writeentry(self, offset, prefix, fnode): |
24735
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changeset
|
737 # Slices on array instances only accept other array. |
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py3: use bytearray() instead of array('c', ...) constructions
Augie Fackler <augie@google.com>
parents:
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changeset
|
738 entry = bytearray(prefix + fnode) |
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|
739 self._raw[offset:offset + _fnodesrecsize] = entry |
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parents:
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|
740 # self._dirtyoffset could be None. |
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|
741 self._dirtyoffset = min(self._dirtyoffset, offset) or 0 |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
742 |
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changeset
|
743 def write(self): |
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diff
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|
744 """Perform all necessary writes to cache file. |
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changeset
|
745 |
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diff
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|
746 This may no-op if no writes are needed or if a write lock could |
07200e3332a1
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|
747 not be obtained. |
07200e3332a1
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parents:
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changeset
|
748 """ |
07200e3332a1
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diff
changeset
|
749 if self._dirtyoffset is None: |
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parents:
24532
diff
changeset
|
750 return |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
751 |
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changeset
|
752 data = self._raw[self._dirtyoffset:] |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
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changeset
|
753 if not data: |
07200e3332a1
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parents:
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diff
changeset
|
754 return |
07200e3332a1
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parents:
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diff
changeset
|
755 |
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changeset
|
756 repo = self._repo |
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changeset
|
757 |
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diff
changeset
|
758 try: |
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changeset
|
759 lock = repo.wlock(wait=False) |
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61aea11fb83d
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Yuya Nishihara <yuya@tcha.org>
parents:
24763
diff
changeset
|
760 except error.LockError: |
24735
07200e3332a1
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diff
changeset
|
761 repo.ui.log('tagscache', |
24806
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tags: do not abort if failed to write lock file to save cache
Yuya Nishihara <yuya@tcha.org>
parents:
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diff
changeset
|
762 'not writing .hg/%s because lock cannot be acquired\n' % |
24735
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changeset
|
763 (_fnodescachefile)) |
07200e3332a1
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changeset
|
764 return |
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
765 |
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parents:
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diff
changeset
|
766 try: |
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parents:
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diff
changeset
|
767 f = repo.vfs.open(_fnodescachefile, 'ab') |
24735
07200e3332a1
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changeset
|
768 try: |
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559f24e3957d
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diff
changeset
|
769 # if the file has been truncated |
559f24e3957d
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parents:
24806
diff
changeset
|
770 actualoffset = f.tell() |
559f24e3957d
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parents:
24806
diff
changeset
|
771 if actualoffset < self._dirtyoffset: |
559f24e3957d
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parents:
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diff
changeset
|
772 self._dirtyoffset = actualoffset |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
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diff
changeset
|
773 data = self._raw[self._dirtyoffset:] |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
774 f.seek(self._dirtyoffset) |
559f24e3957d
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Matt Mackall <mpm@selenic.com>
parents:
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diff
changeset
|
775 f.truncate() |
24735
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changeset
|
776 repo.ui.log('tagscache', |
25087
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diff
changeset
|
777 'writing %d bytes to %s\n' % ( |
559f24e3957d
tags: use try/except/finally
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parents:
24806
diff
changeset
|
778 len(data), _fnodescachefile)) |
559f24e3957d
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Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
779 f.write(data) |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
780 self._dirtyoffset = None |
559f24e3957d
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Matt Mackall <mpm@selenic.com>
parents:
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diff
changeset
|
781 finally: |
559f24e3957d
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Matt Mackall <mpm@selenic.com>
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24806
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782 f.close() |
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global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
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783 except (IOError, OSError) as inst: |
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tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
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784 repo.ui.log('tagscache', |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
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785 "couldn't write %s: %s\n" % ( |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
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786 _fnodescachefile, inst)) |
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tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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787 finally: |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
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788 lock.release() |