Mercurial > hg
annotate mercurial/tags.py @ 17817:b17be267b59c
scmutil: add function to validate new branch, tag, and bookmark names
For now the new function only checks to make sure the new label name
isn't a reserved name ('tip', '.', or 'null'). Eventually more of the
checks will be unified between the different types of labels.
The `tag` command is trivially updated to use it. Updating branches and
bookmarks to use it is slightly more invasive and thus reserved for
later patches.
author | Kevin Bullock <kbullock@ringworld.org> |
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date | Wed, 17 Oct 2012 16:34:46 -0500 |
parents | e7cfe3587ea4 |
children | cb95716da5fe |
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 node import nullid, bin, hex, short |
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14 from i18n import _ |
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15 import encoding |
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16 import error |
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17 import errno |
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18 |
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19 def findglobaltags(ui, repo, alltags, tagtypes): |
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20 '''Find global tags in repo by reading .hgtags from every head that |
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21 has a distinct version of it, using a cache to avoid excess work. |
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22 Updates the dicts alltags, tagtypes in place: alltags maps tag name |
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23 to (node, hist) pair (see _readtags() below), and tagtypes maps tag |
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24 name to tag type ("global" in this case).''' |
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25 # This is so we can be lazy and assume alltags contains only global |
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26 # tags when we pass it to _writetagcache(). |
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27 assert len(alltags) == len(tagtypes) == 0, \ |
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28 "findglobaltags() should be called first" |
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29 |
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30 (heads, tagfnode, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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31 if cachetags is not None: |
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32 assert not shouldwrite |
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33 # XXX is this really 100% correct? are there oddball special |
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34 # cases where a global tag should outrank a local tag but won't, |
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35 # because cachetags does not contain rank info? |
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36 _updatetags(cachetags, 'global', alltags, tagtypes) |
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37 return |
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38 |
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39 seen = set() # set of fnode |
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40 fctx = None |
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41 for head in reversed(heads): # oldest to newest |
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42 assert head in repo.changelog.nodemap, \ |
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43 "tag cache returned bogus head %s" % short(head) |
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44 |
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45 fnode = tagfnode.get(head) |
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46 if fnode and fnode not in seen: |
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47 seen.add(fnode) |
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48 if not fctx: |
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49 fctx = repo.filectx('.hgtags', fileid=fnode) |
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50 else: |
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51 fctx = fctx.filectx(fnode) |
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52 |
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53 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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54 _updatetags(filetags, 'global', alltags, tagtypes) |
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55 |
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56 # and update the cache (if necessary) |
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57 if shouldwrite: |
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58 _writetagcache(ui, repo, heads, tagfnode, alltags) |
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59 |
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60 def readlocaltags(ui, repo, alltags, tagtypes): |
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61 '''Read local tags in repo. Update alltags and tagtypes.''' |
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62 try: |
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63 data = repo.opener.read("localtags") |
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64 except IOError, inst: |
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65 if inst.errno != errno.ENOENT: |
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66 raise |
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67 return |
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68 |
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69 # localtags is in the local encoding; re-encode to UTF-8 on |
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70 # input for consistency with the rest of this module. |
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71 filetags = _readtags( |
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72 ui, repo, data.splitlines(), "localtags", |
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73 recode=encoding.fromlocal) |
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74 _updatetags(filetags, "local", alltags, tagtypes) |
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75 |
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76 def _readtags(ui, repo, lines, fn, recode=None): |
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77 '''Read tag definitions from a file (or any source of lines). |
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78 Return a mapping from tag name to (node, hist): node is the node id |
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79 from the last line read for that name, and hist is the list of node |
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80 ids previously associated with it (in file order). All node ids are |
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81 binary, not hex.''' |
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82 |
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83 filetags = {} # map tag name to (node, hist) |
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84 count = 0 |
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85 |
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86 def warn(msg): |
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87 ui.warn(_("%s, line %s: %s\n") % (fn, count, msg)) |
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88 |
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89 for line in lines: |
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90 count += 1 |
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91 if not line: |
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92 continue |
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93 try: |
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94 (nodehex, name) = line.split(" ", 1) |
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95 except ValueError: |
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96 warn(_("cannot parse entry")) |
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97 continue |
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98 name = name.strip() |
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99 if recode: |
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100 name = recode(name) |
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101 try: |
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102 nodebin = bin(nodehex) |
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103 except TypeError: |
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104 warn(_("node '%s' is not well formed") % nodehex) |
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105 continue |
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106 |
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107 # update filetags |
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108 hist = [] |
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109 if name in filetags: |
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110 n, hist = filetags[name] |
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111 hist.append(n) |
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112 filetags[name] = (nodebin, hist) |
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113 return filetags |
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114 |
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115 def _updatetags(filetags, tagtype, alltags, tagtypes): |
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116 '''Incorporate the tag info read from one file into the two |
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117 dictionaries, alltags and tagtypes, that contain all tag |
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118 info (global across all heads plus local).''' |
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119 |
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120 for name, nodehist in filetags.iteritems(): |
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121 if name not in alltags: |
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122 alltags[name] = nodehist |
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123 tagtypes[name] = tagtype |
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124 continue |
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125 |
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126 # we prefer alltags[name] if: |
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127 # it supersedes us OR |
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128 # mutual supersedes and it has a higher rank |
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129 # otherwise we win because we're tip-most |
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130 anode, ahist = nodehist |
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131 bnode, bhist = alltags[name] |
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132 if (bnode != anode and anode in bhist and |
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133 (bnode not in ahist or len(bhist) > len(ahist))): |
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134 anode = bnode |
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135 ahist.extend([n for n in bhist if n not in ahist]) |
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136 alltags[name] = anode, ahist |
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137 tagtypes[name] = tagtype |
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138 |
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139 |
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140 # The tag cache only stores info about heads, not the tag contents |
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141 # from each head. I.e. it doesn't try to squeeze out the maximum |
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142 # performance, but is simpler has a better chance of actually |
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143 # working correctly. And this gives the biggest performance win: it |
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144 # avoids looking up .hgtags in the manifest for every head, and it |
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145 # can avoid calling heads() at all if there have been no changes to |
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146 # the repo. |
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147 |
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148 def _readtagcache(ui, repo): |
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149 '''Read the tag cache and return a tuple (heads, fnodes, cachetags, |
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150 shouldwrite). If the cache is completely up-to-date, cachetags is a |
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151 dict of the form returned by _readtags(); otherwise, it is None and |
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152 heads and fnodes are set. In that case, heads is the list of all |
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153 heads currently in the repository (ordered from tip to oldest) and |
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154 fnodes is a mapping from head to .hgtags filenode. If those two are |
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155 set, caller is responsible for reading tag info from each head.''' |
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156 |
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157 try: |
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158 cachefile = repo.opener('cache/tags', 'r') |
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159 # force reading the file for static-http |
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160 cachelines = iter(cachefile) |
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161 except IOError: |
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162 cachefile = None |
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163 |
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164 # The cache file consists of lines like |
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165 # <headrev> <headnode> [<tagnode>] |
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166 # where <headrev> and <headnode> redundantly identify a repository |
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167 # head from the time the cache was written, and <tagnode> is the |
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168 # filenode of .hgtags on that head. Heads with no .hgtags file will |
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169 # have no <tagnode>. The cache is ordered from tip to oldest (which |
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170 # is part of why <headrev> is there: a quick visual check is all |
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171 # that's required to ensure correct order). |
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172 # |
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173 # This information is enough to let us avoid the most expensive part |
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174 # of finding global tags, which is looking up <tagnode> in the |
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175 # manifest for each head. |
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176 cacherevs = [] # list of headrev |
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177 cacheheads = [] # list of headnode |
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178 cachefnode = {} # map headnode to filenode |
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179 if cachefile: |
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180 try: |
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181 for line in cachelines: |
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182 if line == "\n": |
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183 break |
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184 line = line.split() |
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185 cacherevs.append(int(line[0])) |
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186 headnode = bin(line[1]) |
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187 cacheheads.append(headnode) |
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188 if len(line) == 3: |
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189 fnode = bin(line[2]) |
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190 cachefnode[headnode] = fnode |
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191 except Exception: |
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192 # corruption of the tags cache, just recompute it |
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193 ui.warn(_('.hg/cache/tags is corrupt, rebuilding it\n')) |
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194 cacheheads = [] |
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195 cacherevs = [] |
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196 cachefnode = {} |
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197 |
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198 tipnode = repo.changelog.tip() |
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199 tiprev = len(repo.changelog) - 1 |
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200 |
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201 # Case 1 (common): tip is the same, so nothing has changed. |
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202 # (Unchanged tip trivially means no changesets have been added. |
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203 # But, thanks to localrepository.destroyed(), it also means none |
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204 # have been destroyed by strip or rollback.) |
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205 if cacheheads and cacheheads[0] == tipnode and cacherevs[0] == tiprev: |
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206 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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207 cachefile.close() |
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208 return (None, None, tags, False) |
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209 if cachefile: |
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210 cachefile.close() # ignore rest of file |
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211 |
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212 repoheads = repo.heads() |
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213 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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214 # writing an empty cache. |
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215 if repoheads == [nullid]: |
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216 return ([], {}, {}, False) |
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217 |
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218 # Case 3 (uncommon): cache file missing or empty. |
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219 |
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220 # Case 4 (uncommon): tip rev decreased. This should only happen |
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221 # when we're called from localrepository.destroyed(). Refresh the |
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222 # cache so future invocations will not see disappeared heads in the |
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223 # cache. |
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224 |
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225 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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226 |
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227 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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228 |
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229 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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230 # exposed". |
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231 if not len(repo.file('.hgtags')): |
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232 # No tags have ever been committed, so we can avoid a |
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233 # potentially expensive search. |
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234 return (repoheads, cachefnode, None, True) |
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235 |
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236 newheads = [head |
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237 for head in repoheads |
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238 if head not in set(cacheheads)] |
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239 |
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240 # Now we have to lookup the .hgtags filenode for every new head. |
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241 # This is the most expensive part of finding tags, so performance |
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242 # depends primarily on the size of newheads. Worst case: no cache |
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243 # file, so newheads == repoheads. |
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244 for head in reversed(newheads): |
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245 cctx = repo[head] |
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246 try: |
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247 fnode = cctx.filenode('.hgtags') |
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248 cachefnode[head] = fnode |
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249 except error.LookupError: |
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250 # no .hgtags file on this head |
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251 pass |
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252 |
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253 # Caller has to iterate over all heads, but can use the filenodes in |
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254 # cachefnode to get to each .hgtags revision quickly. |
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255 return (repoheads, cachefnode, None, True) |
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256 |
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257 def _writetagcache(ui, repo, heads, tagfnode, cachetags): |
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258 |
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259 try: |
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260 cachefile = repo.opener('cache/tags', 'w', atomictemp=True) |
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261 except (OSError, IOError): |
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262 return |
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263 |
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264 realheads = repo.heads() # for sanity checks below |
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265 for head in heads: |
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266 # temporary sanity checks; these can probably be removed |
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267 # once this code has been in crew for a few weeks |
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268 assert head in repo.changelog.nodemap, \ |
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269 'trying to write non-existent node %s to tag cache' % short(head) |
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270 assert head in realheads, \ |
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271 'trying to write non-head %s to tag cache' % short(head) |
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272 assert head != nullid, \ |
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273 'trying to write nullid to tag cache' |
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274 |
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275 # This can't fail because of the first assert above. When/if we |
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276 # remove that assert, we might want to catch LookupError here |
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277 # and downgrade it to a warning. |
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278 rev = repo.changelog.rev(head) |
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279 |
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280 fnode = tagfnode.get(head) |
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281 if fnode: |
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282 cachefile.write('%d %s %s\n' % (rev, hex(head), hex(fnode))) |
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283 else: |
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284 cachefile.write('%d %s\n' % (rev, hex(head))) |
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285 |
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286 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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287 # we keep them in UTF-8 throughout this module. If we converted |
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288 # them local encoding on input, we would lose info writing them to |
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289 # the cache. |
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290 cachefile.write('\n') |
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291 for (name, (node, hist)) in cachetags.iteritems(): |
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292 cachefile.write("%s %s\n" % (hex(node), name)) |
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293 |
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294 try: |
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295 cachefile.close() |
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296 except (OSError, IOError): |
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297 pass |