Mercurial > hg
annotate mercurial/tags.py @ 31758:04ec317b8128
hgweb: expose a followlines UI in filerevision view
In filerevision view (/file/<rev>/<fname>) we add some event listeners on
mouse clicks of <span> elements in the <pre class="sourcelines"> block.
Those listeners will capture a range of lines selected between two mouse
clicks and a box inviting to follow the history of selected lines will then
show up. Selected lines (i.e. the block of lines) get a CSS class which make
them highlighted. Selection can be cancelled (and restarted) by either
clicking on the cancel ("x") button in the invite box or clicking on any other
source line. Also clicking twice on the same line will abort the selection and
reset event listeners to restart the process.
As a first step, this action is only advertised by the "cursor: cell" CSS rule
on source lines elements as any other mechanisms would make the code
significantly more complicated. This might be improved later.
All JavaScript code lives in a new "linerangelog.js" file, sourced in
filerevision template (only in "paper" style for now).
author | Denis Laxalde <denis.laxalde@logilab.fr> |
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date | Wed, 29 Mar 2017 22:26:16 +0200 |
parents | 472d726c1afd |
children | 417363736c11 |
rev | line source |
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1 # tags.py - read tag info from local repository |
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2 # |
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3 # Copyright 2009 Matt Mackall <mpm@selenic.com> |
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4 # Copyright 2009 Greg Ward <greg@gerg.ca> |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
10263 | 7 # GNU General Public License version 2 or any later version. |
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8 |
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9 # Currently this module only deals with reading and caching tags. |
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10 # Eventually, it could take care of updating (adding/removing/moving) |
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11 # tags too. |
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12 |
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13 from __future__ import absolute_import |
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14 |
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15 import errno |
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16 |
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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 findglobaltags(ui, repo): |
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82 '''Find global tags in a repo: return a tagsmap |
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83 |
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84 tagsmap: tag name to (node, hist) 2-tuples. |
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85 |
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86 The tags cache is read and updated as a side-effect of calling. |
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87 ''' |
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88 (heads, tagfnode, valid, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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89 if cachetags is not None: |
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90 assert not shouldwrite |
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91 # XXX is this really 100% correct? are there oddball special |
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92 # cases where a global tag should outrank a local tag but won't, |
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93 # because cachetags does not contain rank info? |
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94 alltags = {} |
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95 _updatetags(cachetags, alltags) |
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96 return alltags |
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97 |
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98 for head in reversed(heads): # oldest to newest |
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99 assert head in repo.changelog.nodemap, \ |
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100 "tag cache returned bogus head %s" % short(head) |
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101 fnodes = _filterfnodes(tagfnode, reversed(heads)) |
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102 alltags = _tagsfromfnodes(ui, repo, fnodes) |
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103 |
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104 # and update the cache (if necessary) |
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105 if shouldwrite: |
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106 _writetagcache(ui, repo, valid, alltags) |
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107 return alltags |
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108 |
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109 def _filterfnodes(tagfnode, nodes): |
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110 """return a list of unique fnodes |
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111 |
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112 The order of this list matches the order of "nodes". Preserving this order |
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113 is important as reading tags in different order provides different |
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114 results.""" |
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115 seen = set() # set of fnode |
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116 fnodes = [] |
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117 for no in nodes: # oldest to newest |
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118 fnode = tagfnode.get(no) |
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119 if fnode and fnode not in seen: |
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120 seen.add(fnode) |
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121 fnodes.append(fnode) |
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122 return fnodes |
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123 |
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124 def _tagsfromfnodes(ui, repo, fnodes): |
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125 """return a tagsmap from a list of file-node |
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126 |
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127 tagsmap: tag name to (node, hist) 2-tuples. |
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128 |
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129 The order of the list matters.""" |
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130 alltags = {} |
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131 fctx = None |
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132 for fnode in fnodes: |
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133 if fctx is None: |
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134 fctx = repo.filectx('.hgtags', fileid=fnode) |
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135 else: |
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136 fctx = fctx.filectx(fnode) |
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137 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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138 _updatetags(filetags, alltags) |
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139 return alltags |
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140 |
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141 def readlocaltags(ui, repo, alltags, tagtypes): |
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142 '''Read local tags in repo. Update alltags and tagtypes.''' |
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143 try: |
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144 data = repo.vfs.read("localtags") |
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145 except IOError as inst: |
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146 if inst.errno != errno.ENOENT: |
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147 raise |
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148 return |
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149 |
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150 # localtags is in the local encoding; re-encode to UTF-8 on |
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151 # input for consistency with the rest of this module. |
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152 filetags = _readtags( |
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153 ui, repo, data.splitlines(), "localtags", |
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154 recode=encoding.fromlocal) |
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155 |
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156 # remove tags pointing to invalid nodes |
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157 cl = repo.changelog |
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158 for t in filetags.keys(): |
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159 try: |
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160 cl.rev(filetags[t][0]) |
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161 except (LookupError, ValueError): |
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162 del filetags[t] |
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163 |
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164 _updatetags(filetags, alltags, 'local', tagtypes) |
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165 |
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166 def _readtaghist(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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167 '''Read tag definitions from a file (or any source of lines). |
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168 |
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169 This function returns two sortdicts with similar information: |
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170 |
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171 - the first dict, bintaghist, contains the tag information as expected by |
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172 the _readtags function, i.e. a mapping from tag name to (node, hist): |
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173 - node is the node id from the last line read for that name, |
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174 - hist is the list of node ids previously associated with it (in file |
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175 order). All node ids are binary, not hex. |
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176 |
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177 - the second dict, hextaglines, is a mapping from tag name to a list of |
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178 [hexnode, line number] pairs, ordered from the oldest to the newest node. |
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179 |
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180 When calcnodelines is False the hextaglines dict is not calculated (an |
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181 empty dict is returned). This is done to improve this function's |
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182 performance in cases where the line numbers are not needed. |
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183 ''' |
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184 |
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185 bintaghist = util.sortdict() |
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186 hextaglines = util.sortdict() |
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187 count = 0 |
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188 |
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189 def dbg(msg): |
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190 ui.debug("%s, line %s: %s\n" % (fn, count, msg)) |
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191 |
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192 for nline, line in enumerate(lines): |
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193 count += 1 |
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194 if not line: |
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195 continue |
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196 try: |
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197 (nodehex, name) = line.split(" ", 1) |
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198 except ValueError: |
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199 dbg("cannot parse entry") |
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200 continue |
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201 name = name.strip() |
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202 if recode: |
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203 name = recode(name) |
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204 try: |
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205 nodebin = bin(nodehex) |
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206 except TypeError: |
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207 dbg("node '%s' is not well formed" % nodehex) |
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208 continue |
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209 |
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210 # update filetags |
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211 if calcnodelines: |
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212 # map tag name to a list of line numbers |
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213 if name not in hextaglines: |
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214 hextaglines[name] = [] |
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215 hextaglines[name].append([nodehex, nline]) |
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216 continue |
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217 # map tag name to (node, hist) |
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218 if name not in bintaghist: |
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219 bintaghist[name] = [] |
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220 bintaghist[name].append(nodebin) |
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221 return bintaghist, hextaglines |
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222 |
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223 def _readtags(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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224 '''Read tag definitions from a file (or any source of lines). |
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225 |
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226 Returns a mapping from tag name to (node, hist). |
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227 |
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228 "node" is the node id from the last line read for that name. "hist" |
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229 is the list of node ids previously associated with it (in file order). |
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230 All node ids are binary, not hex. |
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231 ''' |
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232 filetags, nodelines = _readtaghist(ui, repo, lines, fn, recode=recode, |
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233 calcnodelines=calcnodelines) |
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234 # util.sortdict().__setitem__ is much slower at replacing then inserting |
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235 # new entries. The difference can matter if there are thousands of tags. |
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236 # Create a new sortdict to avoid the performance penalty. |
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237 newtags = util.sortdict() |
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238 for tag, taghist in filetags.items(): |
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239 newtags[tag] = (taghist[-1], taghist[:-1]) |
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240 return newtags |
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241 |
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242 def _updatetags(filetags, alltags, tagtype=None, tagtypes=None): |
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243 """Incorporate the tag info read from one file into dictionnaries |
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244 |
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245 The first one, 'alltags', is a "tagmaps" (see 'findglobaltags' for details). |
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246 |
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247 The second one, 'tagtypes', is optional and will be updated to track the |
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248 "tagtype" of entries in the tagmaps. When set, the 'tagtype' argument also |
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249 needs to be set.""" |
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250 if tagtype is None: |
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251 assert tagtypes is None |
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252 |
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253 for name, nodehist in filetags.iteritems(): |
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254 if name not in alltags: |
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255 alltags[name] = nodehist |
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256 if tagtype is not None: |
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257 tagtypes[name] = tagtype |
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258 continue |
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259 |
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260 # we prefer alltags[name] if: |
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261 # it supersedes us OR |
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262 # mutual supersedes and it has a higher rank |
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263 # otherwise we win because we're tip-most |
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264 anode, ahist = nodehist |
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265 bnode, bhist = alltags[name] |
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266 if (bnode != anode and anode in bhist and |
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267 (bnode not in ahist or len(bhist) > len(ahist))): |
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268 anode = bnode |
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269 elif tagtype is not None: |
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270 tagtypes[name] = tagtype |
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271 ahist.extend([n for n in bhist if n not in ahist]) |
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272 alltags[name] = anode, ahist |
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273 |
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274 def _filename(repo): |
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275 """name of a tagcache file for a given repo or repoview""" |
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276 filename = 'cache/tags2' |
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277 if repo.filtername: |
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278 filename = '%s-%s' % (filename, repo.filtername) |
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279 return filename |
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280 |
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281 def _readtagcache(ui, repo): |
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282 '''Read the tag cache. |
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283 |
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284 Returns a tuple (heads, fnodes, validinfo, cachetags, shouldwrite). |
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285 |
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286 If the cache is completely up-to-date, "cachetags" is a dict of the |
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287 form returned by _readtags() and "heads", "fnodes", and "validinfo" are |
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288 None and "shouldwrite" is False. |
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289 |
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290 If the cache is not up to date, "cachetags" is None. "heads" is a list |
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291 of all heads currently in the repository, ordered from tip to oldest. |
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292 "validinfo" is a tuple describing cache validation info. This is used |
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293 when writing the tags cache. "fnodes" is a mapping from head to .hgtags |
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294 filenode. "shouldwrite" is True. |
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295 |
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296 If the cache is not up to date, the caller is responsible for reading tag |
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297 info from each returned head. (See findglobaltags().) |
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298 ''' |
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299 try: |
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300 cachefile = repo.vfs(_filename(repo), 'r') |
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301 # force reading the file for static-http |
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302 cachelines = iter(cachefile) |
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303 except IOError: |
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304 cachefile = None |
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305 |
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306 cacherev = None |
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307 cachenode = None |
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308 cachehash = None |
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309 if cachefile: |
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310 try: |
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311 validline = next(cachelines) |
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312 validline = validline.split() |
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313 cacherev = int(validline[0]) |
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314 cachenode = bin(validline[1]) |
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315 if len(validline) > 2: |
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316 cachehash = bin(validline[2]) |
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317 except Exception: |
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318 # corruption of the cache, just recompute it. |
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319 pass |
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320 |
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321 tipnode = repo.changelog.tip() |
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322 tiprev = len(repo.changelog) - 1 |
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323 |
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324 # Case 1 (common): tip is the same, so nothing has changed. |
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325 # (Unchanged tip trivially means no changesets have been added. |
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326 # But, thanks to localrepository.destroyed(), it also means none |
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327 # have been destroyed by strip or rollback.) |
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328 if (cacherev == tiprev |
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329 and cachenode == tipnode |
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330 and cachehash == scmutil.filteredhash(repo, tiprev)): |
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331 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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332 cachefile.close() |
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333 return (None, None, None, tags, False) |
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334 if cachefile: |
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335 cachefile.close() # ignore rest of file |
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336 |
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337 valid = (tiprev, tipnode, scmutil.filteredhash(repo, tiprev)) |
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338 |
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339 repoheads = repo.heads() |
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340 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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341 # writing an empty cache. |
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342 if repoheads == [nullid]: |
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343 return ([], {}, valid, {}, False) |
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344 |
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345 # Case 3 (uncommon): cache file missing or empty. |
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346 |
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347 # Case 4 (uncommon): tip rev decreased. This should only happen |
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348 # when we're called from localrepository.destroyed(). Refresh the |
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349 # cache so future invocations will not see disappeared heads in the |
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350 # cache. |
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351 |
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352 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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353 |
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354 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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355 |
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356 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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357 # exposed". |
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358 if not len(repo.file('.hgtags')): |
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359 # No tags have ever been committed, so we can avoid a |
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360 # potentially expensive search. |
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361 return ([], {}, valid, None, True) |
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362 |
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363 |
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364 # Now we have to lookup the .hgtags filenode for every new head. |
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365 # This is the most expensive part of finding tags, so performance |
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366 # depends primarily on the size of newheads. Worst case: no cache |
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367 # file, so newheads == repoheads. |
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368 cachefnode = _getfnodes(ui, repo, repoheads) |
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369 |
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370 # Caller has to iterate over all heads, but can use the filenodes in |
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371 # cachefnode to get to each .hgtags revision quickly. |
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372 return (repoheads, cachefnode, valid, None, True) |
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373 |
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374 def _getfnodes(ui, repo, nodes): |
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375 """return .hgtags fnodes for a list of changeset nodes |
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376 |
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377 Return value is a {node: fnode} mapping. There will be no entry for nodes |
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378 without a '.hgtags' file. |
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379 """ |
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380 starttime = util.timer() |
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381 fnodescache = hgtagsfnodescache(repo.unfiltered()) |
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382 cachefnode = {} |
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383 for head in reversed(nodes): |
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384 fnode = fnodescache.getfnode(head) |
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385 if fnode != nullid: |
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386 cachefnode[head] = fnode |
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387 |
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388 fnodescache.write() |
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389 |
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390 duration = util.timer() - starttime |
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391 ui.log('tagscache', |
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392 '%d/%d cache hits/lookups in %0.4f ' |
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393 'seconds\n', |
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394 fnodescache.hitcount, fnodescache.lookupcount, duration) |
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395 return cachefnode |
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396 |
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397 def _writetagcache(ui, repo, valid, cachetags): |
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398 filename = _filename(repo) |
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399 try: |
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400 cachefile = repo.vfs(filename, 'w', atomictemp=True) |
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401 except (OSError, IOError): |
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402 return |
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403 |
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404 ui.log('tagscache', 'writing .hg/%s with %d tags\n', |
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405 filename, len(cachetags)) |
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406 |
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407 if valid[2]: |
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408 cachefile.write('%d %s %s\n' % (valid[0], hex(valid[1]), hex(valid[2]))) |
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409 else: |
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410 cachefile.write('%d %s\n' % (valid[0], hex(valid[1]))) |
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411 |
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412 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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413 # we keep them in UTF-8 throughout this module. If we converted |
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414 # them local encoding on input, we would lose info writing them to |
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415 # the cache. |
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416 for (name, (node, hist)) in sorted(cachetags.iteritems()): |
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417 for n in hist: |
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418 cachefile.write("%s %s\n" % (hex(n), name)) |
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419 cachefile.write("%s %s\n" % (hex(node), name)) |
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420 |
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421 try: |
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422 cachefile.close() |
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423 except (OSError, IOError): |
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424 pass |
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425 |
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426 def tag(repo, names, node, message, local, user, date, editor=False): |
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427 '''tag a revision with one or more symbolic names. |
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428 |
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429 names is a list of strings or, when adding a single tag, names may be a |
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430 string. |
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431 |
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432 if local is True, the tags are stored in a per-repository file. |
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433 otherwise, they are stored in the .hgtags file, and a new |
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434 changeset is committed with the change. |
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435 |
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436 keyword arguments: |
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437 |
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438 local: whether to store tags in non-version-controlled file |
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439 (default False) |
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440 |
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441 message: commit message to use if committing |
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442 |
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443 user: name of user to use if committing |
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444 |
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445 date: date tuple to use if committing''' |
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446 |
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447 if not local: |
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448 m = matchmod.exact(repo.root, '', ['.hgtags']) |
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449 if any(repo.status(match=m, unknown=True, ignored=True)): |
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450 raise error.Abort(_('working copy of .hgtags is changed'), |
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451 hint=_('please commit .hgtags manually')) |
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452 |
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453 repo.tags() # instantiate the cache |
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454 _tag(repo.unfiltered(), names, node, message, local, user, date, |
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455 editor=editor) |
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456 |
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457 def _tag(repo, names, node, message, local, user, date, extra=None, |
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458 editor=False): |
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459 if isinstance(names, str): |
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460 names = (names,) |
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461 |
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462 branches = repo.branchmap() |
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463 for name in names: |
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464 repo.hook('pretag', throw=True, node=hex(node), tag=name, |
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465 local=local) |
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466 if name in branches: |
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467 repo.ui.warn(_("warning: tag %s conflicts with existing" |
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468 " branch name\n") % name) |
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469 |
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470 def writetags(fp, names, munge, prevtags): |
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471 fp.seek(0, 2) |
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472 if prevtags and prevtags[-1] != '\n': |
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473 fp.write('\n') |
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474 for name in names: |
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475 if munge: |
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476 m = munge(name) |
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477 else: |
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478 m = name |
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479 |
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480 if (repo._tagscache.tagtypes and |
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481 name in repo._tagscache.tagtypes): |
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482 old = repo.tags().get(name, nullid) |
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483 fp.write('%s %s\n' % (hex(old), m)) |
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484 fp.write('%s %s\n' % (hex(node), m)) |
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485 fp.close() |
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486 |
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487 prevtags = '' |
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488 if local: |
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489 try: |
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490 fp = repo.vfs('localtags', 'r+') |
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491 except IOError: |
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492 fp = repo.vfs('localtags', 'a') |
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493 else: |
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494 prevtags = fp.read() |
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495 |
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496 # local tags are stored in the current charset |
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497 writetags(fp, names, None, prevtags) |
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498 for name in names: |
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499 repo.hook('tag', node=hex(node), tag=name, local=local) |
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500 return |
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501 |
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502 try: |
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503 fp = repo.wvfs('.hgtags', 'rb+') |
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504 except IOError as e: |
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505 if e.errno != errno.ENOENT: |
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506 raise |
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507 fp = repo.wvfs('.hgtags', 'ab') |
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508 else: |
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509 prevtags = fp.read() |
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510 |
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511 # committed tags are stored in UTF-8 |
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512 writetags(fp, names, encoding.fromlocal, prevtags) |
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513 |
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514 fp.close() |
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515 |
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516 repo.invalidatecaches() |
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517 |
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518 if '.hgtags' not in repo.dirstate: |
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519 repo[None].add(['.hgtags']) |
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520 |
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521 m = matchmod.exact(repo.root, '', ['.hgtags']) |
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522 tagnode = repo.commit(message, user, date, extra=extra, match=m, |
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523 editor=editor) |
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524 |
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525 for name in names: |
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526 repo.hook('tag', node=hex(node), tag=name, local=local) |
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527 |
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528 return tagnode |
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529 |
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530 _fnodescachefile = 'cache/hgtagsfnodes1' |
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531 _fnodesrecsize = 4 + 20 # changeset fragment + filenode |
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532 _fnodesmissingrec = '\xff' * 24 |
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533 |
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534 class hgtagsfnodescache(object): |
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535 """Persistent cache mapping revisions to .hgtags filenodes. |
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536 |
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537 The cache is an array of records. Each item in the array corresponds to |
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538 a changelog revision. Values in the array contain the first 4 bytes of |
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539 the node hash and the 20 bytes .hgtags filenode for that revision. |
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540 |
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541 The first 4 bytes are present as a form of verification. Repository |
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542 stripping and rewriting may change the node at a numeric revision in the |
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543 changelog. The changeset fragment serves as a verifier to detect |
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544 rewriting. This logic is shared with the rev branch cache (see |
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545 branchmap.py). |
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546 |
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547 The instance holds in memory the full cache content but entries are |
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548 only parsed on read. |
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549 |
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550 Instances behave like lists. ``c[i]`` works where i is a rev or |
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551 changeset node. Missing indexes are populated automatically on access. |
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552 """ |
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553 def __init__(self, repo): |
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554 assert repo.filtername is None |
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555 |
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556 self._repo = repo |
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557 |
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558 # Only for reporting purposes. |
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559 self.lookupcount = 0 |
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560 self.hitcount = 0 |
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561 |
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562 |
29039
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563 try: |
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564 data = repo.vfs.read(_fnodescachefile) |
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565 except (OSError, IOError): |
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566 data = "" |
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567 self._raw = bytearray(data) |
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568 |
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569 # The end state of self._raw is an array that is of the exact length |
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570 # required to hold a record for every revision in the repository. |
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571 # We truncate or extend the array as necessary. self._dirtyoffset is |
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572 # defined to be the start offset at which we need to write the output |
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573 # file. This offset is also adjusted when new entries are calculated |
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574 # for array members. |
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575 cllen = len(repo.changelog) |
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576 wantedlen = cllen * _fnodesrecsize |
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577 rawlen = len(self._raw) |
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578 |
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579 self._dirtyoffset = None |
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580 |
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581 if rawlen < wantedlen: |
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582 self._dirtyoffset = rawlen |
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583 self._raw.extend('\xff' * (wantedlen - rawlen)) |
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584 elif rawlen > wantedlen: |
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585 # There's no easy way to truncate array instances. This seems |
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586 # slightly less evil than copying a potentially large array slice. |
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587 for i in range(rawlen - wantedlen): |
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588 self._raw.pop() |
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589 self._dirtyoffset = len(self._raw) |
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590 |
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591 def getfnode(self, node, computemissing=True): |
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592 """Obtain the filenode of the .hgtags file at a specified revision. |
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593 |
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594 If the value is in the cache, the entry will be validated and returned. |
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595 Otherwise, the filenode will be computed and returned unless |
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596 "computemissing" is False, in which case None will be returned without |
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597 any potentially expensive computation being performed. |
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|
598 |
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599 If an .hgtags does not exist at the specified revision, nullid is |
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600 returned. |
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601 """ |
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602 ctx = self._repo[node] |
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603 rev = ctx.rev() |
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604 |
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605 self.lookupcount += 1 |
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606 |
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607 offset = rev * _fnodesrecsize |
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608 record = '%s' % self._raw[offset:offset + _fnodesrecsize] |
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609 properprefix = node[0:4] |
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610 |
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611 # Validate and return existing entry. |
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612 if record != _fnodesmissingrec: |
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613 fileprefix = record[0:4] |
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|
614 |
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615 if fileprefix == properprefix: |
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616 self.hitcount += 1 |
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617 return record[4:] |
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618 |
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619 # Fall through. |
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620 |
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621 # If we get here, the entry is either missing or invalid. |
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|
622 |
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|
623 if not computemissing: |
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|
624 return None |
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|
625 |
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626 # Populate missing entry. |
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627 try: |
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628 fnode = ctx.filenode('.hgtags') |
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629 except error.LookupError: |
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630 # No .hgtags file on this revision. |
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631 fnode = nullid |
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632 |
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|
633 self._writeentry(offset, properprefix, fnode) |
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634 return fnode |
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|
635 |
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|
636 def setfnode(self, node, fnode): |
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637 """Set the .hgtags filenode for a given changeset.""" |
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638 assert len(fnode) == 20 |
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639 ctx = self._repo[node] |
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|
640 |
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|
641 # Do a lookup first to avoid writing if nothing has changed. |
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642 if self.getfnode(ctx.node(), computemissing=False) == fnode: |
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|
643 return |
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|
644 |
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645 self._writeentry(ctx.rev() * _fnodesrecsize, node[0:4], fnode) |
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|
646 |
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|
647 def _writeentry(self, offset, prefix, fnode): |
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648 # Slices on array instances only accept other array. |
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649 entry = bytearray(prefix + fnode) |
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650 self._raw[offset:offset + _fnodesrecsize] = entry |
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651 # self._dirtyoffset could be None. |
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652 self._dirtyoffset = min(self._dirtyoffset, offset) or 0 |
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|
653 |
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654 def write(self): |
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655 """Perform all necessary writes to cache file. |
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|
656 |
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657 This may no-op if no writes are needed or if a write lock could |
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658 not be obtained. |
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659 """ |
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660 if self._dirtyoffset is None: |
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|
661 return |
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|
662 |
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663 data = self._raw[self._dirtyoffset:] |
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664 if not data: |
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|
665 return |
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|
666 |
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667 repo = self._repo |
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668 |
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|
669 try: |
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670 lock = repo.wlock(wait=False) |
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671 except error.LockError: |
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672 repo.ui.log('tagscache', |
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|
673 'not writing .hg/%s because lock cannot be acquired\n' % |
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674 (_fnodescachefile)) |
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675 return |
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676 |
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677 try: |
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678 f = repo.vfs.open(_fnodescachefile, 'ab') |
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679 try: |
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680 # if the file has been truncated |
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681 actualoffset = f.tell() |
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682 if actualoffset < self._dirtyoffset: |
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683 self._dirtyoffset = actualoffset |
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684 data = self._raw[self._dirtyoffset:] |
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685 f.seek(self._dirtyoffset) |
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686 f.truncate() |
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687 repo.ui.log('tagscache', |
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688 'writing %d bytes to %s\n' % ( |
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689 len(data), _fnodescachefile)) |
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690 f.write(data) |
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691 self._dirtyoffset = None |
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692 finally: |
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693 f.close() |
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694 except (IOError, OSError) as inst: |
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695 repo.ui.log('tagscache', |
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696 "couldn't write %s: %s\n" % ( |
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697 _fnodescachefile, inst)) |
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698 finally: |
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699 lock.release() |