Mercurial > hg
annotate mercurial/tags.py @ 31957:84f9eb9758c0
atexit: test failing handlers
author | Bryan O'Sullivan <bryano@fb.com> |
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date | Tue, 11 Apr 2017 14:54:12 -0700 |
parents | 417363736c11 |
children | bfb826c350d4 |
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 node in reversed(nodes): |
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384 fnode = fnodescache.getfnode(node) |
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385 if fnode != nullid: |
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386 cachefnode[node] = 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 |
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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 |
25381
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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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changeset
|
662 |
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|
663 data = self._raw[self._dirtyoffset:] |
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|
664 if not data: |
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changeset
|
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() |