Mercurial > hg
annotate mercurial/tags.py @ 37084:f0b6fbea00cf
stringutil: bulk-replace call sites to point to new module
This might conflict with other patches floating around, sorry.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Thu, 22 Mar 2018 21:56:20 +0900 |
parents | 3e458c583d2c |
children | 4c5864dad8b0 |
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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 from .utils import ( |
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32 stringutil, |
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33 ) |
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34 |
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35 # Tags computation can be expensive and caches exist to make it fast in |
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36 # the common case. |
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37 # |
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38 # The "hgtagsfnodes1" cache file caches the .hgtags filenode values for |
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39 # each revision in the repository. The file is effectively an array of |
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40 # fixed length records. Read the docs for "hgtagsfnodescache" for technical |
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41 # details. |
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42 # |
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43 # The .hgtags filenode cache grows in proportion to the length of the |
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44 # changelog. The file is truncated when the # changelog is stripped. |
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45 # |
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46 # The purpose of the filenode cache is to avoid the most expensive part |
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47 # of finding global tags, which is looking up the .hgtags filenode in the |
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48 # manifest for each head. This can take dozens or over 100ms for |
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49 # repositories with very large manifests. Multiplied by dozens or even |
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50 # hundreds of heads and there is a significant performance concern. |
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51 # |
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52 # There also exist a separate cache file for each repository filter. |
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53 # These "tags-*" files store information about the history of tags. |
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54 # |
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55 # The tags cache files consists of a cache validation line followed by |
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56 # a history of tags. |
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57 # |
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58 # The cache validation line has the format: |
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59 # |
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60 # <tiprev> <tipnode> [<filteredhash>] |
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61 # |
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62 # <tiprev> is an integer revision and <tipnode> is a 40 character hex |
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63 # node for that changeset. These redundantly identify the repository |
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64 # tip from the time the cache was written. In addition, <filteredhash>, |
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65 # if present, is a 40 character hex hash of the contents of the filtered |
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66 # revisions for this filter. If the set of filtered revs changes, the |
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67 # hash will change and invalidate the cache. |
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68 # |
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69 # The history part of the tags cache consists of lines of the form: |
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70 # |
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71 # <node> <tag> |
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72 # |
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73 # (This format is identical to that of .hgtags files.) |
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74 # |
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75 # <tag> is the tag name and <node> is the 40 character hex changeset |
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76 # the tag is associated with. |
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77 # |
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78 # Tags are written sorted by tag name. |
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79 # |
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80 # Tags associated with multiple changesets have an entry for each changeset. |
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81 # The most recent changeset (in terms of revlog ordering for the head |
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82 # setting it) for each tag is last. |
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83 |
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84 def fnoderevs(ui, repo, revs): |
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85 """return the list of '.hgtags' fnodes used in a set revisions |
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86 |
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87 This is returned as list of unique fnodes. We use a list instead of a set |
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88 because order matters when it comes to tags.""" |
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89 unfi = repo.unfiltered() |
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90 tonode = unfi.changelog.node |
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91 nodes = [tonode(r) for r in revs] |
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92 fnodes = _getfnodes(ui, repo, nodes[::-1]) # reversed help the cache |
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93 fnodes = _filterfnodes(fnodes, nodes) |
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94 return fnodes |
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95 |
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96 def _nulltonone(value): |
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97 """convert nullid to None |
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98 |
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99 For tag value, nullid means "deleted". This small utility function helps |
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100 translating that to None.""" |
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101 if value == nullid: |
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102 return None |
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103 return value |
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104 |
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105 def difftags(ui, repo, oldfnodes, newfnodes): |
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106 """list differences between tags expressed in two set of file-nodes |
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107 |
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108 The list contains entries in the form: (tagname, oldvalue, new value). |
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109 None is used to expressed missing value: |
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110 ('foo', None, 'abcd') is a new tag, |
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111 ('bar', 'ef01', None) is a deletion, |
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112 ('baz', 'abcd', 'ef01') is a tag movement. |
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113 """ |
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114 if oldfnodes == newfnodes: |
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115 return [] |
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116 oldtags = _tagsfromfnodes(ui, repo, oldfnodes) |
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117 newtags = _tagsfromfnodes(ui, repo, newfnodes) |
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118 |
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119 # list of (tag, old, new): None means missing |
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120 entries = [] |
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121 for tag, (new, __) in newtags.items(): |
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122 new = _nulltonone(new) |
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123 old, __ = oldtags.pop(tag, (None, None)) |
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124 old = _nulltonone(old) |
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125 if old != new: |
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126 entries.append((tag, old, new)) |
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127 # handle deleted tags |
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128 for tag, (old, __) in oldtags.items(): |
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129 old = _nulltonone(old) |
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130 if old is not None: |
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131 entries.append((tag, old, None)) |
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132 entries.sort() |
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133 return entries |
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134 |
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135 def writediff(fp, difflist): |
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136 """write tags diff information to a file. |
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137 |
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138 Data are stored with a line based format: |
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139 |
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140 <action> <hex-node> <tag-name>\n |
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141 |
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142 Action are defined as follow: |
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143 -R tag is removed, |
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144 +A tag is added, |
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145 -M tag is moved (old value), |
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146 +M tag is moved (new value), |
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147 |
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148 Example: |
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149 |
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150 +A 875517b4806a848f942811a315a5bce30804ae85 t5 |
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151 |
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152 See documentation of difftags output for details about the input. |
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153 """ |
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154 add = '+A %s %s\n' |
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155 remove = '-R %s %s\n' |
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156 updateold = '-M %s %s\n' |
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157 updatenew = '+M %s %s\n' |
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158 for tag, old, new in difflist: |
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159 # translate to hex |
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160 if old is not None: |
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161 old = hex(old) |
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162 if new is not None: |
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163 new = hex(new) |
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164 # write to file |
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165 if old is None: |
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166 fp.write(add % (new, tag)) |
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167 elif new is None: |
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168 fp.write(remove % (old, tag)) |
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169 else: |
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170 fp.write(updateold % (old, tag)) |
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171 fp.write(updatenew % (new, tag)) |
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172 |
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173 def findglobaltags(ui, repo): |
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174 '''Find global tags in a repo: return a tagsmap |
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175 |
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176 tagsmap: tag name to (node, hist) 2-tuples. |
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177 |
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178 The tags cache is read and updated as a side-effect of calling. |
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179 ''' |
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180 (heads, tagfnode, valid, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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181 if cachetags is not None: |
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182 assert not shouldwrite |
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183 # XXX is this really 100% correct? are there oddball special |
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184 # cases where a global tag should outrank a local tag but won't, |
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185 # because cachetags does not contain rank info? |
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186 alltags = {} |
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187 _updatetags(cachetags, alltags) |
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188 return alltags |
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189 |
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190 for head in reversed(heads): # oldest to newest |
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191 assert head in repo.changelog.nodemap, \ |
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192 "tag cache returned bogus head %s" % short(head) |
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193 fnodes = _filterfnodes(tagfnode, reversed(heads)) |
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194 alltags = _tagsfromfnodes(ui, repo, fnodes) |
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195 |
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196 # and update the cache (if necessary) |
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197 if shouldwrite: |
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198 _writetagcache(ui, repo, valid, alltags) |
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199 return alltags |
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200 |
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201 def _filterfnodes(tagfnode, nodes): |
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202 """return a list of unique fnodes |
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203 |
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204 The order of this list matches the order of "nodes". Preserving this order |
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205 is important as reading tags in different order provides different |
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206 results.""" |
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207 seen = set() # set of fnode |
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208 fnodes = [] |
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209 for no in nodes: # oldest to newest |
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210 fnode = tagfnode.get(no) |
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211 if fnode and fnode not in seen: |
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212 seen.add(fnode) |
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213 fnodes.append(fnode) |
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214 return fnodes |
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215 |
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216 def _tagsfromfnodes(ui, repo, fnodes): |
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217 """return a tagsmap from a list of file-node |
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218 |
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219 tagsmap: tag name to (node, hist) 2-tuples. |
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220 |
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221 The order of the list matters.""" |
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222 alltags = {} |
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223 fctx = None |
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224 for fnode in fnodes: |
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225 if fctx is None: |
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226 fctx = repo.filectx('.hgtags', fileid=fnode) |
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227 else: |
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228 fctx = fctx.filectx(fnode) |
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229 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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230 _updatetags(filetags, alltags) |
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231 return alltags |
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232 |
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233 def readlocaltags(ui, repo, alltags, tagtypes): |
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234 '''Read local tags in repo. Update alltags and tagtypes.''' |
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235 try: |
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236 data = repo.vfs.read("localtags") |
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237 except IOError as inst: |
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238 if inst.errno != errno.ENOENT: |
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239 raise |
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240 return |
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241 |
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242 # localtags is in the local encoding; re-encode to UTF-8 on |
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243 # input for consistency with the rest of this module. |
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244 filetags = _readtags( |
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245 ui, repo, data.splitlines(), "localtags", |
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246 recode=encoding.fromlocal) |
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247 |
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248 # remove tags pointing to invalid nodes |
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249 cl = repo.changelog |
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250 for t in list(filetags): |
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251 try: |
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252 cl.rev(filetags[t][0]) |
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253 except (LookupError, ValueError): |
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254 del filetags[t] |
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255 |
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256 _updatetags(filetags, alltags, 'local', tagtypes) |
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257 |
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258 def _readtaghist(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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259 '''Read tag definitions from a file (or any source of lines). |
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260 |
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261 This function returns two sortdicts with similar information: |
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262 |
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263 - the first dict, bintaghist, contains the tag information as expected by |
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264 the _readtags function, i.e. a mapping from tag name to (node, hist): |
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265 - node is the node id from the last line read for that name, |
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266 - hist is the list of node ids previously associated with it (in file |
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267 order). All node ids are binary, not hex. |
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268 |
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269 - the second dict, hextaglines, is a mapping from tag name to a list of |
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270 [hexnode, line number] pairs, ordered from the oldest to the newest node. |
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271 |
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272 When calcnodelines is False the hextaglines dict is not calculated (an |
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273 empty dict is returned). This is done to improve this function's |
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274 performance in cases where the line numbers are not needed. |
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275 ''' |
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276 |
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277 bintaghist = util.sortdict() |
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278 hextaglines = util.sortdict() |
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279 count = 0 |
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280 |
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281 def dbg(msg): |
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282 ui.debug("%s, line %d: %s\n" % (fn, count, msg)) |
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283 |
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284 for nline, line in enumerate(lines): |
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285 count += 1 |
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286 if not line: |
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287 continue |
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288 try: |
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289 (nodehex, name) = line.split(" ", 1) |
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290 except ValueError: |
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291 dbg("cannot parse entry") |
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292 continue |
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293 name = name.strip() |
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294 if recode: |
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295 name = recode(name) |
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296 try: |
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297 nodebin = bin(nodehex) |
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298 except TypeError: |
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299 dbg("node '%s' is not well formed" % nodehex) |
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300 continue |
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301 |
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302 # update filetags |
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303 if calcnodelines: |
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304 # map tag name to a list of line numbers |
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305 if name not in hextaglines: |
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306 hextaglines[name] = [] |
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307 hextaglines[name].append([nodehex, nline]) |
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308 continue |
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309 # map tag name to (node, hist) |
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310 if name not in bintaghist: |
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311 bintaghist[name] = [] |
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312 bintaghist[name].append(nodebin) |
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313 return bintaghist, hextaglines |
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314 |
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315 def _readtags(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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316 '''Read tag definitions from a file (or any source of lines). |
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317 |
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318 Returns a mapping from tag name to (node, hist). |
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319 |
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320 "node" is the node id from the last line read for that name. "hist" |
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321 is the list of node ids previously associated with it (in file order). |
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322 All node ids are binary, not hex. |
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323 ''' |
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324 filetags, nodelines = _readtaghist(ui, repo, lines, fn, recode=recode, |
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325 calcnodelines=calcnodelines) |
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326 # util.sortdict().__setitem__ is much slower at replacing then inserting |
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327 # new entries. The difference can matter if there are thousands of tags. |
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328 # Create a new sortdict to avoid the performance penalty. |
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329 newtags = util.sortdict() |
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330 for tag, taghist in filetags.items(): |
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331 newtags[tag] = (taghist[-1], taghist[:-1]) |
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332 return newtags |
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333 |
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334 def _updatetags(filetags, alltags, tagtype=None, tagtypes=None): |
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335 """Incorporate the tag info read from one file into dictionnaries |
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336 |
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337 The first one, 'alltags', is a "tagmaps" (see 'findglobaltags' for details). |
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338 |
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339 The second one, 'tagtypes', is optional and will be updated to track the |
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340 "tagtype" of entries in the tagmaps. When set, the 'tagtype' argument also |
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341 needs to be set.""" |
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342 if tagtype is None: |
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343 assert tagtypes is None |
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344 |
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345 for name, nodehist in filetags.iteritems(): |
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346 if name not in alltags: |
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347 alltags[name] = nodehist |
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348 if tagtype is not None: |
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349 tagtypes[name] = tagtype |
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350 continue |
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351 |
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352 # we prefer alltags[name] if: |
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353 # it supersedes us OR |
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354 # mutual supersedes and it has a higher rank |
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355 # otherwise we win because we're tip-most |
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356 anode, ahist = nodehist |
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357 bnode, bhist = alltags[name] |
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358 if (bnode != anode and anode in bhist and |
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359 (bnode not in ahist or len(bhist) > len(ahist))): |
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360 anode = bnode |
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361 elif tagtype is not None: |
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362 tagtypes[name] = tagtype |
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363 ahist.extend([n for n in bhist if n not in ahist]) |
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364 alltags[name] = anode, ahist |
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365 |
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366 def _filename(repo): |
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367 """name of a tagcache file for a given repo or repoview""" |
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368 filename = 'tags2' |
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369 if repo.filtername: |
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370 filename = '%s-%s' % (filename, repo.filtername) |
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371 return filename |
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372 |
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373 def _readtagcache(ui, repo): |
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374 '''Read the tag cache. |
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375 |
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376 Returns a tuple (heads, fnodes, validinfo, cachetags, shouldwrite). |
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377 |
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378 If the cache is completely up-to-date, "cachetags" is a dict of the |
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379 form returned by _readtags() and "heads", "fnodes", and "validinfo" are |
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380 None and "shouldwrite" is False. |
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381 |
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382 If the cache is not up to date, "cachetags" is None. "heads" is a list |
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383 of all heads currently in the repository, ordered from tip to oldest. |
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384 "validinfo" is a tuple describing cache validation info. This is used |
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385 when writing the tags cache. "fnodes" is a mapping from head to .hgtags |
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386 filenode. "shouldwrite" is True. |
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387 |
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388 If the cache is not up to date, the caller is responsible for reading tag |
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389 info from each returned head. (See findglobaltags().) |
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390 ''' |
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391 try: |
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392 cachefile = repo.cachevfs(_filename(repo), 'r') |
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393 # force reading the file for static-http |
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394 cachelines = iter(cachefile) |
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395 except IOError: |
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396 cachefile = None |
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397 |
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398 cacherev = None |
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399 cachenode = None |
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400 cachehash = None |
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401 if cachefile: |
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402 try: |
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403 validline = next(cachelines) |
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404 validline = validline.split() |
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405 cacherev = int(validline[0]) |
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406 cachenode = bin(validline[1]) |
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407 if len(validline) > 2: |
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408 cachehash = bin(validline[2]) |
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409 except Exception: |
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410 # corruption of the cache, just recompute it. |
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411 pass |
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412 |
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413 tipnode = repo.changelog.tip() |
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414 tiprev = len(repo.changelog) - 1 |
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415 |
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416 # Case 1 (common): tip is the same, so nothing has changed. |
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417 # (Unchanged tip trivially means no changesets have been added. |
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418 # But, thanks to localrepository.destroyed(), it also means none |
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419 # have been destroyed by strip or rollback.) |
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420 if (cacherev == tiprev |
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421 and cachenode == tipnode |
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422 and cachehash == scmutil.filteredhash(repo, tiprev)): |
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423 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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424 cachefile.close() |
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425 return (None, None, None, tags, False) |
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426 if cachefile: |
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427 cachefile.close() # ignore rest of file |
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428 |
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429 valid = (tiprev, tipnode, scmutil.filteredhash(repo, tiprev)) |
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430 |
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431 repoheads = repo.heads() |
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432 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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433 # writing an empty cache. |
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434 if repoheads == [nullid]: |
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435 return ([], {}, valid, {}, False) |
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436 |
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437 # Case 3 (uncommon): cache file missing or empty. |
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438 |
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439 # Case 4 (uncommon): tip rev decreased. This should only happen |
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440 # when we're called from localrepository.destroyed(). Refresh the |
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441 # cache so future invocations will not see disappeared heads in the |
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442 # cache. |
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443 |
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444 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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445 |
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446 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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447 |
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448 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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449 # exposed". |
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450 if not len(repo.file('.hgtags')): |
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451 # No tags have ever been committed, so we can avoid a |
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452 # potentially expensive search. |
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453 return ([], {}, valid, None, True) |
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454 |
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455 |
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456 # Now we have to lookup the .hgtags filenode for every new head. |
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457 # This is the most expensive part of finding tags, so performance |
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458 # depends primarily on the size of newheads. Worst case: no cache |
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459 # file, so newheads == repoheads. |
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460 cachefnode = _getfnodes(ui, repo, repoheads) |
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461 |
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462 # Caller has to iterate over all heads, but can use the filenodes in |
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463 # cachefnode to get to each .hgtags revision quickly. |
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464 return (repoheads, cachefnode, valid, None, True) |
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465 |
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466 def _getfnodes(ui, repo, nodes): |
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467 """return .hgtags fnodes for a list of changeset nodes |
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468 |
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469 Return value is a {node: fnode} mapping. There will be no entry for nodes |
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470 without a '.hgtags' file. |
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471 """ |
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472 starttime = util.timer() |
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473 fnodescache = hgtagsfnodescache(repo.unfiltered()) |
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474 cachefnode = {} |
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475 for node in reversed(nodes): |
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476 fnode = fnodescache.getfnode(node) |
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477 if fnode != nullid: |
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478 cachefnode[node] = fnode |
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479 |
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480 fnodescache.write() |
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481 |
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482 duration = util.timer() - starttime |
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483 ui.log('tagscache', |
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484 '%d/%d cache hits/lookups in %0.4f ' |
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485 'seconds\n', |
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486 fnodescache.hitcount, fnodescache.lookupcount, duration) |
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487 return cachefnode |
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488 |
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489 def _writetagcache(ui, repo, valid, cachetags): |
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490 filename = _filename(repo) |
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491 try: |
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492 cachefile = repo.cachevfs(filename, 'w', atomictemp=True) |
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493 except (OSError, IOError): |
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494 return |
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495 |
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496 ui.log('tagscache', 'writing .hg/cache/%s with %d tags\n', |
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497 filename, len(cachetags)) |
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498 |
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499 if valid[2]: |
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500 cachefile.write('%d %s %s\n' % (valid[0], hex(valid[1]), hex(valid[2]))) |
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501 else: |
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502 cachefile.write('%d %s\n' % (valid[0], hex(valid[1]))) |
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503 |
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504 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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505 # we keep them in UTF-8 throughout this module. If we converted |
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506 # them local encoding on input, we would lose info writing them to |
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507 # the cache. |
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508 for (name, (node, hist)) in sorted(cachetags.iteritems()): |
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509 for n in hist: |
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510 cachefile.write("%s %s\n" % (hex(n), name)) |
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511 cachefile.write("%s %s\n" % (hex(node), name)) |
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512 |
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513 try: |
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514 cachefile.close() |
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515 except (OSError, IOError): |
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516 pass |
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517 |
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518 def tag(repo, names, node, message, local, user, date, editor=False): |
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519 '''tag a revision with one or more symbolic names. |
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520 |
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521 names is a list of strings or, when adding a single tag, names may be a |
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522 string. |
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523 |
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524 if local is True, the tags are stored in a per-repository file. |
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525 otherwise, they are stored in the .hgtags file, and a new |
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526 changeset is committed with the change. |
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527 |
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528 keyword arguments: |
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529 |
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530 local: whether to store tags in non-version-controlled file |
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531 (default False) |
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532 |
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533 message: commit message to use if committing |
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534 |
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535 user: name of user to use if committing |
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536 |
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537 date: date tuple to use if committing''' |
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538 |
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539 if not local: |
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540 m = matchmod.exact(repo.root, '', ['.hgtags']) |
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541 if any(repo.status(match=m, unknown=True, ignored=True)): |
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542 raise error.Abort(_('working copy of .hgtags is changed'), |
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543 hint=_('please commit .hgtags manually')) |
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544 |
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545 with repo.wlock(): |
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546 repo.tags() # instantiate the cache |
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547 _tag(repo, names, node, message, local, user, date, |
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548 editor=editor) |
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549 |
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550 def _tag(repo, names, node, message, local, user, date, extra=None, |
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551 editor=False): |
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552 if isinstance(names, str): |
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553 names = (names,) |
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554 |
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555 branches = repo.branchmap() |
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556 for name in names: |
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557 repo.hook('pretag', throw=True, node=hex(node), tag=name, |
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558 local=local) |
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559 if name in branches: |
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560 repo.ui.warn(_("warning: tag %s conflicts with existing" |
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561 " branch name\n") % name) |
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562 |
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563 def writetags(fp, names, munge, prevtags): |
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564 fp.seek(0, 2) |
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565 if prevtags and not prevtags.endswith('\n'): |
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566 fp.write('\n') |
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567 for name in names: |
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568 if munge: |
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569 m = munge(name) |
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570 else: |
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571 m = name |
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572 |
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573 if (repo._tagscache.tagtypes and |
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574 name in repo._tagscache.tagtypes): |
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575 old = repo.tags().get(name, nullid) |
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576 fp.write('%s %s\n' % (hex(old), m)) |
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577 fp.write('%s %s\n' % (hex(node), m)) |
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578 fp.close() |
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579 |
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580 prevtags = '' |
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581 if local: |
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582 try: |
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583 fp = repo.vfs('localtags', 'r+') |
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584 except IOError: |
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585 fp = repo.vfs('localtags', 'a') |
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586 else: |
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587 prevtags = fp.read() |
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588 |
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589 # local tags are stored in the current charset |
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590 writetags(fp, names, None, prevtags) |
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591 for name in names: |
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592 repo.hook('tag', node=hex(node), tag=name, local=local) |
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593 return |
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594 |
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595 try: |
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596 fp = repo.wvfs('.hgtags', 'rb+') |
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597 except IOError as e: |
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598 if e.errno != errno.ENOENT: |
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599 raise |
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600 fp = repo.wvfs('.hgtags', 'ab') |
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601 else: |
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602 prevtags = fp.read() |
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603 |
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604 # committed tags are stored in UTF-8 |
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605 writetags(fp, names, encoding.fromlocal, prevtags) |
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606 |
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607 fp.close() |
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608 |
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609 repo.invalidatecaches() |
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610 |
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611 if '.hgtags' not in repo.dirstate: |
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612 repo[None].add(['.hgtags']) |
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613 |
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614 m = matchmod.exact(repo.root, '', ['.hgtags']) |
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615 tagnode = repo.commit(message, user, date, extra=extra, match=m, |
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616 editor=editor) |
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617 |
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618 for name in names: |
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619 repo.hook('tag', node=hex(node), tag=name, local=local) |
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620 |
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621 return tagnode |
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622 |
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623 _fnodescachefile = 'hgtagsfnodes1' |
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624 _fnodesrecsize = 4 + 20 # changeset fragment + filenode |
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625 _fnodesmissingrec = '\xff' * 24 |
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626 |
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627 class hgtagsfnodescache(object): |
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628 """Persistent cache mapping revisions to .hgtags filenodes. |
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629 |
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630 The cache is an array of records. Each item in the array corresponds to |
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631 a changelog revision. Values in the array contain the first 4 bytes of |
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632 the node hash and the 20 bytes .hgtags filenode for that revision. |
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633 |
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634 The first 4 bytes are present as a form of verification. Repository |
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635 stripping and rewriting may change the node at a numeric revision in the |
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636 changelog. The changeset fragment serves as a verifier to detect |
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637 rewriting. This logic is shared with the rev branch cache (see |
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638 branchmap.py). |
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639 |
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640 The instance holds in memory the full cache content but entries are |
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641 only parsed on read. |
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642 |
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643 Instances behave like lists. ``c[i]`` works where i is a rev or |
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644 changeset node. Missing indexes are populated automatically on access. |
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645 """ |
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646 def __init__(self, repo): |
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647 assert repo.filtername is None |
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648 |
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649 self._repo = repo |
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650 |
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651 # Only for reporting purposes. |
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652 self.lookupcount = 0 |
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653 self.hitcount = 0 |
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654 |
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655 |
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656 try: |
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657 data = repo.cachevfs.read(_fnodescachefile) |
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658 except (OSError, IOError): |
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659 data = "" |
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660 self._raw = bytearray(data) |
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661 |
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662 # The end state of self._raw is an array that is of the exact length |
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663 # required to hold a record for every revision in the repository. |
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664 # We truncate or extend the array as necessary. self._dirtyoffset is |
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665 # defined to be the start offset at which we need to write the output |
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666 # file. This offset is also adjusted when new entries are calculated |
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|
667 # for array members. |
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668 cllen = len(repo.changelog) |
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|
669 wantedlen = cllen * _fnodesrecsize |
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|
670 rawlen = len(self._raw) |
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|
671 |
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672 self._dirtyoffset = None |
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|
673 |
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674 if rawlen < wantedlen: |
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675 self._dirtyoffset = rawlen |
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676 self._raw.extend('\xff' * (wantedlen - rawlen)) |
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677 elif rawlen > wantedlen: |
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|
678 # There's no easy way to truncate array instances. This seems |
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679 # slightly less evil than copying a potentially large array slice. |
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|
680 for i in range(rawlen - wantedlen): |
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681 self._raw.pop() |
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682 self._dirtyoffset = len(self._raw) |
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683 |
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684 def getfnode(self, node, computemissing=True): |
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685 """Obtain the filenode of the .hgtags file at a specified revision. |
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|
686 |
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687 If the value is in the cache, the entry will be validated and returned. |
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|
688 Otherwise, the filenode will be computed and returned unless |
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689 "computemissing" is False, in which case None will be returned without |
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tags: support reading tags cache without populating
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690 any potentially expensive computation being performed. |
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|
691 |
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692 If an .hgtags does not exist at the specified revision, nullid is |
07200e3332a1
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|
693 returned. |
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694 """ |
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695 ctx = self._repo[node] |
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696 rev = ctx.rev() |
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|
697 |
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|
698 self.lookupcount += 1 |
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|
699 |
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|
700 offset = rev * _fnodesrecsize |
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701 record = '%s' % self._raw[offset:offset + _fnodesrecsize] |
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702 properprefix = node[0:4] |
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|
703 |
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|
704 # Validate and return existing entry. |
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|
705 if record != _fnodesmissingrec: |
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|
706 fileprefix = record[0:4] |
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changeset
|
707 |
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|
708 if fileprefix == properprefix: |
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|
709 self.hitcount += 1 |
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|
710 return record[4:] |
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changeset
|
711 |
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|
712 # Fall through. |
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|
713 |
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|
714 # If we get here, the entry is either missing or invalid. |
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diff
changeset
|
715 |
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changeset
|
716 if not computemissing: |
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|
717 return None |
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parents:
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diff
changeset
|
718 |
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|
719 # Populate missing entry. |
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|
720 try: |
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changeset
|
721 fnode = ctx.filenode('.hgtags') |
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|
722 except error.LookupError: |
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|
723 # No .hgtags file on this revision. |
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diff
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|
724 fnode = nullid |
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changeset
|
725 |
25381
47edeff19139
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
726 self._writeentry(offset, properprefix, fnode) |
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changeset
|
727 return fnode |
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diff
changeset
|
728 |
47edeff19139
tags: support setting hgtags fnodes cache entries
Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
729 def setfnode(self, node, fnode): |
47edeff19139
tags: support setting hgtags fnodes cache entries
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parents:
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diff
changeset
|
730 """Set the .hgtags filenode for a given changeset.""" |
47edeff19139
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parents:
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diff
changeset
|
731 assert len(fnode) == 20 |
47edeff19139
tags: support setting hgtags fnodes cache entries
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diff
changeset
|
732 ctx = self._repo[node] |
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parents:
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diff
changeset
|
733 |
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parents:
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diff
changeset
|
734 # Do a lookup first to avoid writing if nothing has changed. |
47edeff19139
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diff
changeset
|
735 if self.getfnode(ctx.node(), computemissing=False) == fnode: |
47edeff19139
tags: support setting hgtags fnodes cache entries
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parents:
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diff
changeset
|
736 return |
47edeff19139
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parents:
25380
diff
changeset
|
737 |
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parents:
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diff
changeset
|
738 self._writeentry(ctx.rev() * _fnodesrecsize, node[0:4], fnode) |
47edeff19139
tags: support setting hgtags fnodes cache entries
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parents:
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diff
changeset
|
739 |
47edeff19139
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diff
changeset
|
740 def _writeentry(self, offset, prefix, fnode): |
24735
07200e3332a1
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changeset
|
741 # Slices on array instances only accept other array. |
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py3: use bytearray() instead of array('c', ...) constructions
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parents:
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changeset
|
742 entry = bytearray(prefix + fnode) |
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parents:
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diff
changeset
|
743 self._raw[offset:offset + _fnodesrecsize] = entry |
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parents:
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diff
changeset
|
744 # self._dirtyoffset could be None. |
36277
18106c3bc94a
tags: don't feed both int and None to min()
Augie Fackler <augie@google.com>
parents:
35828
diff
changeset
|
745 self._dirtyoffset = min(self._dirtyoffset or 0, offset or 0) |
24735
07200e3332a1
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diff
changeset
|
746 |
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parents:
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diff
changeset
|
747 def write(self): |
07200e3332a1
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diff
changeset
|
748 """Perform all necessary writes to cache file. |
07200e3332a1
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parents:
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changeset
|
749 |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
750 This may no-op if no writes are needed or if a write lock could |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
751 not be obtained. |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
changeset
|
752 """ |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
753 if self._dirtyoffset is None: |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
754 return |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
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parents:
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diff
changeset
|
755 |
07200e3332a1
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parents:
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diff
changeset
|
756 data = self._raw[self._dirtyoffset:] |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
757 if not data: |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
758 return |
07200e3332a1
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parents:
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diff
changeset
|
759 |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
760 repo = self._repo |
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
761 |
07200e3332a1
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parents:
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diff
changeset
|
762 try: |
07200e3332a1
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parents:
24532
diff
changeset
|
763 lock = repo.wlock(wait=False) |
24806
61aea11fb83d
tags: do not abort if failed to write lock file to save cache
Yuya Nishihara <yuya@tcha.org>
parents:
24763
diff
changeset
|
764 except error.LockError: |
33537
709dde1c5dd5
cachevfs: migration the tags fnode cache to 'cachevfs'
Boris Feld <boris.feld@octobus.net>
parents:
33536
diff
changeset
|
765 repo.ui.log('tagscache', 'not writing .hg/cache/%s because ' |
709dde1c5dd5
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parents:
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diff
changeset
|
766 'lock cannot be acquired\n' % (_fnodescachefile)) |
24735
07200e3332a1
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diff
changeset
|
767 return |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
768 |
07200e3332a1
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
769 try: |
33537
709dde1c5dd5
cachevfs: migration the tags fnode cache to 'cachevfs'
Boris Feld <boris.feld@octobus.net>
parents:
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diff
changeset
|
770 f = repo.cachevfs.open(_fnodescachefile, 'ab') |
24735
07200e3332a1
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parents:
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diff
changeset
|
771 try: |
25087
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tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
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diff
changeset
|
772 # if the file has been truncated |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
773 actualoffset = f.tell() |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
774 if actualoffset < self._dirtyoffset: |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
775 self._dirtyoffset = actualoffset |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
776 data = self._raw[self._dirtyoffset:] |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
777 f.seek(self._dirtyoffset) |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
changeset
|
778 f.truncate() |
24735
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parents:
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diff
changeset
|
779 repo.ui.log('tagscache', |
33537
709dde1c5dd5
cachevfs: migration the tags fnode cache to 'cachevfs'
Boris Feld <boris.feld@octobus.net>
parents:
33536
diff
changeset
|
780 'writing %d bytes to cache/%s\n' % ( |
25087
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
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781 len(data), _fnodescachefile)) |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
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782 f.write(data) |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
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783 self._dirtyoffset = None |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
24806
diff
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784 finally: |
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
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785 f.close() |
25660
328739ea70c3
global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25381
diff
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786 except (IOError, OSError) as inst: |
25087
559f24e3957d
tags: use try/except/finally
Matt Mackall <mpm@selenic.com>
parents:
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787 repo.ui.log('tagscache', |
33537
709dde1c5dd5
cachevfs: migration the tags fnode cache to 'cachevfs'
Boris Feld <boris.feld@octobus.net>
parents:
33536
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788 "couldn't write cache/%s: %s\n" % ( |
37084
f0b6fbea00cf
stringutil: bulk-replace call sites to point to new module
Yuya Nishihara <yuya@tcha.org>
parents:
36543
diff
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789 _fnodescachefile, stringutil.forcebytestr(inst))) |
24735
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
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790 finally: |
07200e3332a1
tags: extract .hgtags filenodes cache to a standalone file
Gregory Szorc <gregory.szorc@gmail.com>
parents:
24532
diff
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791 lock.release() |