Mercurial > hg
annotate mercurial/tags.py @ 24695:419528cb05b6
subrepo: convert the os.path references in git to vfs
There are a handful of os.path references in the free functions at the top of
the module that will be trickier to remove.
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Sat, 07 Feb 2015 12:57:40 -0500 |
parents | f5de208a635c |
children | 07200e3332a1 |
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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 node import nullid, bin, hex, short |
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14 from i18n import _ |
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15 import util |
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16 import encoding |
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17 import error |
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18 import errno |
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19 import time |
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20 |
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21 # The tags cache stores information about heads and the history of tags. |
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22 # |
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23 # The cache file consists of two parts. The first part maps head nodes |
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24 # to .hgtags filenodes. The second part is a history of tags. The two |
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25 # parts are separated by an empty line. |
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26 # |
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27 # The first part consists of lines of the form: |
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28 # |
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29 # <headrev> <headnode> [<hgtagsnode>] |
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30 # |
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31 # <headrev> is an integer revision and <headnode> is a 40 character hex |
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32 # node for that changeset. These redundantly identify a repository |
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33 # head from the time the cache was written. |
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34 # |
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35 # <tagnode> is the filenode of .hgtags on that head. Heads with no .hgtags |
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36 # file will have no <hgtagsnode> (just 2 values per line). |
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37 # |
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38 # The filenode cache is ordered from tip to oldest (which is part of why |
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39 # <headrev> is there: a quick check of the tip from when the cache was |
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40 # written against the current tip is all that is needed to check whether |
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41 # the cache is up to date). |
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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 over a minute on repositories |
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46 # that have large manifests and many heads. |
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47 # |
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48 # The second part of the tags cache consists of lines of the form: |
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49 # |
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50 # <node> <tag> |
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51 # |
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52 # (This format is identical to that of .hgtags files.) |
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53 # |
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54 # <tag> is the tag name and <node> is the 40 character hex changeset |
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55 # the tag is associated with. |
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56 # |
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57 # Tags are written sorted by tag name. |
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58 # |
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59 # Tags associated with multiple changesets have an entry for each changeset. |
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60 # The most recent changeset (in terms of revlog ordering for the head |
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61 # setting it) for each tag is last. |
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62 |
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63 def findglobaltags(ui, repo, alltags, tagtypes): |
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64 '''Find global tags in a repo. |
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65 |
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66 "alltags" maps tag name to (node, hist) 2-tuples. |
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67 |
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68 "tagtypes" maps tag name to tag type. Global tags always have the |
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69 "global" tag type. |
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70 |
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71 The "alltags" and "tagtypes" dicts are updated in place. Empty dicts |
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72 should be passed in. |
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73 |
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74 The tags cache is read and updated as a side-effect of calling. |
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75 ''' |
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76 # This is so we can be lazy and assume alltags contains only global |
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77 # tags when we pass it to _writetagcache(). |
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78 assert len(alltags) == len(tagtypes) == 0, \ |
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79 "findglobaltags() should be called first" |
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80 |
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81 (heads, tagfnode, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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82 if cachetags is not None: |
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83 assert not shouldwrite |
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84 # XXX is this really 100% correct? are there oddball special |
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85 # cases where a global tag should outrank a local tag but won't, |
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86 # because cachetags does not contain rank info? |
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87 _updatetags(cachetags, 'global', alltags, tagtypes) |
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88 return |
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89 |
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90 seen = set() # set of fnode |
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91 fctx = None |
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92 for head in reversed(heads): # oldest to newest |
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93 assert head in repo.changelog.nodemap, \ |
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94 "tag cache returned bogus head %s" % short(head) |
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95 |
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96 fnode = tagfnode.get(head) |
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97 if fnode and fnode not in seen: |
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98 seen.add(fnode) |
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99 if not fctx: |
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100 fctx = repo.filectx('.hgtags', fileid=fnode) |
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101 else: |
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102 fctx = fctx.filectx(fnode) |
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103 |
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104 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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105 _updatetags(filetags, 'global', alltags, tagtypes) |
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106 |
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107 # and update the cache (if necessary) |
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108 if shouldwrite: |
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109 _writetagcache(ui, repo, heads, tagfnode, alltags) |
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110 |
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111 def readlocaltags(ui, repo, alltags, tagtypes): |
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112 '''Read local tags in repo. Update alltags and tagtypes.''' |
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113 try: |
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114 data = repo.vfs.read("localtags") |
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115 except IOError, inst: |
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116 if inst.errno != errno.ENOENT: |
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117 raise |
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118 return |
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119 |
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120 # localtags is in the local encoding; re-encode to UTF-8 on |
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121 # input for consistency with the rest of this module. |
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122 filetags = _readtags( |
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123 ui, repo, data.splitlines(), "localtags", |
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124 recode=encoding.fromlocal) |
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125 |
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126 # remove tags pointing to invalid nodes |
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127 cl = repo.changelog |
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128 for t in filetags.keys(): |
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129 try: |
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130 cl.rev(filetags[t][0]) |
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131 except (LookupError, ValueError): |
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132 del filetags[t] |
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133 |
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134 _updatetags(filetags, "local", alltags, tagtypes) |
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135 |
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136 def _readtaghist(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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137 '''Read tag definitions from a file (or any source of lines). |
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138 |
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139 This function returns two sortdicts with similar information: |
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140 |
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141 - the first dict, bintaghist, contains the tag information as expected by |
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142 the _readtags function, i.e. a mapping from tag name to (node, hist): |
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143 - node is the node id from the last line read for that name, |
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144 - hist is the list of node ids previously associated with it (in file |
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145 order). All node ids are binary, not hex. |
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146 |
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147 - the second dict, hextaglines, is a mapping from tag name to a list of |
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148 [hexnode, line number] pairs, ordered from the oldest to the newest node. |
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149 |
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150 When calcnodelines is False the hextaglines dict is not calculated (an |
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151 empty dict is returned). This is done to improve this function's |
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152 performance in cases where the line numbers are not needed. |
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153 ''' |
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154 |
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155 bintaghist = util.sortdict() |
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156 hextaglines = util.sortdict() |
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157 count = 0 |
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158 |
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159 def warn(msg): |
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160 ui.warn(_("%s, line %s: %s\n") % (fn, count, msg)) |
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161 |
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162 for nline, line in enumerate(lines): |
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163 count += 1 |
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164 if not line: |
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165 continue |
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166 try: |
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167 (nodehex, name) = line.split(" ", 1) |
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168 except ValueError: |
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169 warn(_("cannot parse entry")) |
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170 continue |
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171 name = name.strip() |
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172 if recode: |
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173 name = recode(name) |
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174 try: |
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175 nodebin = bin(nodehex) |
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176 except TypeError: |
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177 warn(_("node '%s' is not well formed") % nodehex) |
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178 continue |
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179 |
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180 # update filetags |
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181 if calcnodelines: |
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182 # map tag name to a list of line numbers |
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183 if name not in hextaglines: |
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184 hextaglines[name] = [] |
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185 hextaglines[name].append([nodehex, nline]) |
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186 continue |
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187 # map tag name to (node, hist) |
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188 if name not in bintaghist: |
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189 bintaghist[name] = [] |
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190 bintaghist[name].append(nodebin) |
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191 return bintaghist, hextaglines |
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192 |
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193 def _readtags(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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194 '''Read tag definitions from a file (or any source of lines). |
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195 |
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196 Returns a mapping from tag name to (node, hist). |
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197 |
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198 "node" is the node id from the last line read for that name. "hist" |
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199 is the list of node ids previously associated with it (in file order). |
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200 All node ids are binary, not hex. |
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201 ''' |
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202 filetags, nodelines = _readtaghist(ui, repo, lines, fn, recode=recode, |
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203 calcnodelines=calcnodelines) |
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204 for tag, taghist in filetags.items(): |
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205 filetags[tag] = (taghist[-1], taghist[:-1]) |
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206 return filetags |
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207 |
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208 def _updatetags(filetags, tagtype, alltags, tagtypes): |
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209 '''Incorporate the tag info read from one file into the two |
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210 dictionaries, alltags and tagtypes, that contain all tag |
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211 info (global across all heads plus local).''' |
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212 |
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213 for name, nodehist in filetags.iteritems(): |
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214 if name not in alltags: |
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215 alltags[name] = nodehist |
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216 tagtypes[name] = tagtype |
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217 continue |
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218 |
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219 # we prefer alltags[name] if: |
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220 # it supersedes us OR |
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221 # mutual supersedes and it has a higher rank |
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222 # otherwise we win because we're tip-most |
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223 anode, ahist = nodehist |
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224 bnode, bhist = alltags[name] |
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225 if (bnode != anode and anode in bhist and |
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226 (bnode not in ahist or len(bhist) > len(ahist))): |
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227 anode = bnode |
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228 else: |
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229 tagtypes[name] = tagtype |
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230 ahist.extend([n for n in bhist if n not in ahist]) |
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231 alltags[name] = anode, ahist |
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232 |
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233 def _readtagcache(ui, repo): |
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234 '''Read the tag cache. |
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235 |
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236 Returns a tuple (heads, fnodes, cachetags, shouldwrite). |
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237 |
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238 If the cache is completely up-to-date, "cachetags" is a dict of the |
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239 form returned by _readtags() and "heads" and "fnodes" are None and |
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240 "shouldwrite" is False. |
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241 |
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242 If the cache is not up to date, "cachetags" is None. "heads" is a list |
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243 of all heads currently in the repository, ordered from tip to oldest. |
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244 "fnodes" is a mapping from head to .hgtags filenode. "shouldwrite" is |
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245 True. |
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246 |
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247 If the cache is not up to date, the caller is responsible for reading tag |
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248 info from each returned head. (See findglobaltags().) |
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249 ''' |
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250 |
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251 try: |
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252 cachefile = repo.vfs('cache/tags', 'r') |
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253 # force reading the file for static-http |
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254 cachelines = iter(cachefile) |
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255 except IOError: |
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256 cachefile = None |
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257 |
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258 cacherevs = [] # list of headrev |
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259 cacheheads = [] # list of headnode |
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260 cachefnode = {} # map headnode to filenode |
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261 if cachefile: |
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262 try: |
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263 for line in cachelines: |
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264 if line == "\n": |
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265 break |
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266 line = line.split() |
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267 cacherevs.append(int(line[0])) |
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268 headnode = bin(line[1]) |
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269 cacheheads.append(headnode) |
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270 if len(line) == 3: |
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271 fnode = bin(line[2]) |
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272 cachefnode[headnode] = fnode |
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273 except Exception: |
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274 # corruption of the tags cache, just recompute it |
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275 cacheheads = [] |
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276 cacherevs = [] |
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277 cachefnode = {} |
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278 |
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279 tipnode = repo.changelog.tip() |
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280 tiprev = len(repo.changelog) - 1 |
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281 |
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282 # Case 1 (common): tip is the same, so nothing has changed. |
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283 # (Unchanged tip trivially means no changesets have been added. |
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284 # But, thanks to localrepository.destroyed(), it also means none |
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285 # have been destroyed by strip or rollback.) |
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286 if cacheheads and cacheheads[0] == tipnode and cacherevs[0] == tiprev: |
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287 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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288 cachefile.close() |
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289 return (None, None, tags, False) |
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290 if cachefile: |
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291 cachefile.close() # ignore rest of file |
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292 |
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293 repoheads = repo.heads() |
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294 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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295 # writing an empty cache. |
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296 if repoheads == [nullid]: |
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297 return ([], {}, {}, False) |
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298 |
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299 # Case 3 (uncommon): cache file missing or empty. |
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300 |
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301 # Case 4 (uncommon): tip rev decreased. This should only happen |
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302 # when we're called from localrepository.destroyed(). Refresh the |
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303 # cache so future invocations will not see disappeared heads in the |
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304 # cache. |
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305 |
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306 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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307 |
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308 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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309 |
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310 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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311 # exposed". |
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312 if not len(repo.file('.hgtags')): |
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313 # No tags have ever been committed, so we can avoid a |
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314 # potentially expensive search. |
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315 return (repoheads, cachefnode, None, True) |
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316 |
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317 starttime = time.time() |
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318 |
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319 newheads = [head |
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320 for head in repoheads |
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321 if head not in set(cacheheads)] |
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322 |
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323 # Now we have to lookup the .hgtags filenode for every new head. |
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324 # This is the most expensive part of finding tags, so performance |
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325 # depends primarily on the size of newheads. Worst case: no cache |
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326 # file, so newheads == repoheads. |
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327 for head in reversed(newheads): |
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328 cctx = repo[head] |
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329 try: |
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330 fnode = cctx.filenode('.hgtags') |
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331 cachefnode[head] = fnode |
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332 except error.LookupError: |
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333 # no .hgtags file on this head |
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334 pass |
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335 |
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336 duration = time.time() - starttime |
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337 ui.log('tagscache', |
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338 'resolved %d tags cache entries from %d manifests in %0.4f ' |
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339 'seconds\n', |
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340 len(cachefnode), len(newheads), duration) |
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341 |
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342 # Caller has to iterate over all heads, but can use the filenodes in |
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343 # cachefnode to get to each .hgtags revision quickly. |
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344 return (repoheads, cachefnode, None, True) |
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345 |
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346 def _writetagcache(ui, repo, heads, tagfnode, cachetags): |
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347 try: |
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348 cachefile = repo.vfs('cache/tags', 'w', atomictemp=True) |
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349 except (OSError, IOError): |
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350 return |
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351 |
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352 ui.log('tagscache', 'writing tags cache file with %d heads and %d tags\n', |
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353 len(heads), len(cachetags)) |
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354 |
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355 realheads = repo.heads() # for sanity checks below |
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356 for head in heads: |
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357 # temporary sanity checks; these can probably be removed |
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358 # once this code has been in crew for a few weeks |
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359 assert head in repo.changelog.nodemap, \ |
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360 'trying to write non-existent node %s to tag cache' % short(head) |
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361 assert head in realheads, \ |
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362 'trying to write non-head %s to tag cache' % short(head) |
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363 assert head != nullid, \ |
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364 'trying to write nullid to tag cache' |
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365 |
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366 # This can't fail because of the first assert above. When/if we |
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367 # remove that assert, we might want to catch LookupError here |
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368 # and downgrade it to a warning. |
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369 rev = repo.changelog.rev(head) |
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370 |
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371 fnode = tagfnode.get(head) |
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372 if fnode: |
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373 cachefile.write('%d %s %s\n' % (rev, hex(head), hex(fnode))) |
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374 else: |
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375 cachefile.write('%d %s\n' % (rev, hex(head))) |
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376 |
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377 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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378 # we keep them in UTF-8 throughout this module. If we converted |
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379 # them local encoding on input, we would lose info writing them to |
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380 # the cache. |
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381 cachefile.write('\n') |
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382 for (name, (node, hist)) in sorted(cachetags.iteritems()): |
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383 for n in hist: |
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384 cachefile.write("%s %s\n" % (hex(n), name)) |
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385 cachefile.write("%s %s\n" % (hex(node), name)) |
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386 |
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387 try: |
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388 cachefile.close() |
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389 except (OSError, IOError): |
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390 pass |