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1 # bzr support for the convert extension
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2 # This module is for handling 'bzr', that was formerly known as Bazaar-NG;
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3 # it cannot access 'bar' repositories, but they were never used very much
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4
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5 import os
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6 from mercurial import demandimport
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7 # these do not work with demandimport, blacklist
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8 demandimport.ignore.extend([
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9 'bzrlib.transactions',
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10 'bzrlib.urlutils',
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11 ])
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12
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13 from mercurial.i18n import _
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14 from mercurial import util
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15 from common import NoRepo, commit, converter_source
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16
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17 try:
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18 # bazaar imports
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19 from bzrlib import branch, revision, errors
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20 from bzrlib.revisionspec import RevisionSpec
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21 except ImportError:
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22 pass
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23
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24 class bzr_source(converter_source):
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25 """Reads Bazaar repositories by using the Bazaar Python libraries"""
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26
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27 def __init__(self, ui, path, rev=None):
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28 super(bzr_source, self).__init__(ui, path, rev=rev)
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29
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30 try:
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31 # access bzrlib stuff
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32 branch
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33 except NameError:
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34 raise NoRepo('Bazaar modules could not be loaded')
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35
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36 if not os.path.exists(os.path.join(path, '.bzr')):
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37 raise NoRepo('%s does not look like a Bazaar repo' % path)
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38
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39 path = os.path.abspath(path)
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40 self.branch = branch.Branch.open(path)
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41 self.sourcerepo = self.branch.repository
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42 self._parentids = {}
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43
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44 def before(self):
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45 """Before the conversion begins, acquire a read lock
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46 for all the operations that might need it. Fortunately
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47 read locks don't block other reads or writes to the
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48 repository, so this shouldn't have any impact on the usage of
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49 the source repository.
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50
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51 The alternative would be locking on every operation that
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52 needs locks (there are currently two: getting the file and
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53 getting the parent map) and releasing immediately after,
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54 but this approach can take even 40% longer."""
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55 self.sourcerepo.lock_read()
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56
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57 def after(self):
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58 self.sourcerepo.unlock()
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59
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60 def getheads(self):
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61 if not self.rev:
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62 return [self.branch.last_revision()]
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63 try:
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64 r = RevisionSpec.from_string(self.rev)
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65 info = r.in_history(self.branch)
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66 except errors.BzrError:
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67 raise util.Abort(_('%s is not a valid revision in current branch')
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68 % self.rev)
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69 return [info.rev_id]
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70
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71 def getfile(self, name, rev):
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72 revtree = self.sourcerepo.revision_tree(rev)
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73 fileid = revtree.path2id(name)
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74 if fileid is None:
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75 # the file is not available anymore - was deleted
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76 raise IOError(_('%s is not available in %s anymore') %
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77 (name, rev))
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78 sio = revtree.get_file(fileid)
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79 return sio.read()
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80
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81 def getmode(self, name, rev):
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82 return self._modecache[(name, rev)]
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83
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84 def getchanges(self, version):
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85 # set up caches: modecache and revtree
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86 self._modecache = {}
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87 self._revtree = self.sourcerepo.revision_tree(version)
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88 # get the parentids from the cache
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89 parentids = self._parentids.pop(version)
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90 # only diff against first parent id
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91 prevtree = self.sourcerepo.revision_tree(parentids[0])
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92 return self._gettreechanges(self._revtree, prevtree)
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93
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94 def getcommit(self, version):
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95 rev = self.sourcerepo.get_revision(version)
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96 # populate parent id cache
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97 if not rev.parent_ids:
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98 parents = []
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99 self._parentids[version] = (revision.NULL_REVISION,)
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100 else:
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101 parents = self._filterghosts(rev.parent_ids)
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102 self._parentids[version] = parents
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103
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104 return commit(parents=parents,
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105 # bzr uses 1 second timezone precision
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106 date='%d %d' % (rev.timestamp, rev.timezone / 3600),
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107 author=self.recode(rev.committer),
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108 # bzr returns bytestrings or unicode, depending on the content
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109 desc=self.recode(rev.message),
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110 rev=version)
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111
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112 def gettags(self):
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113 if not self.branch.supports_tags():
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114 return {}
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115 tagdict = self.branch.tags.get_tag_dict()
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116 bytetags = {}
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117 for name, rev in tagdict.iteritems():
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118 bytetags[self.recode(name)] = rev
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119 return bytetags
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120
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121 def getchangedfiles(self, rev, i):
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122 self._modecache = {}
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123 curtree = self.sourcerepo.revision_tree(rev)
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124 parentids = self._parentids.pop(rev)
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125 if i is not None:
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126 parentid = parentids[i]
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127 else:
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128 # no parent id, get the empty revision
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129 parentid = revision.NULL_REVISION
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130
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131 prevtree = self.sourcerepo.revision_tree(parentid)
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132 changes = [e[0] for e in self._gettreechanges(curtree, prevtree)[0]]
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133 return changes
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134
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135 def _gettreechanges(self, current, origin):
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136 revid = current._revision_id;
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137 changes = []
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138 renames = {}
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139 for (fileid, paths, changed_content, versioned, parent, name,
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140 kind, executable) in current.iter_changes(origin):
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141
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142 if paths[0] == u'' or paths[1] == u'':
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143 # ignore changes to tree root
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144 continue
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145
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146 # bazaar tracks directories, mercurial does not, so
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147 # we have to rename the directory contents
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148 if kind[1] == 'directory':
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149 if None not in paths and paths[0] != paths[1]:
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150 # neither an add nor an delete - a move
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151 # rename all directory contents manually
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152 subdir = origin.inventory.path2id(paths[0])
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153 # get all child-entries of the directory
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154 for name, entry in origin.inventory.iter_entries(subdir):
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155 # hg does not track directory renames
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156 if entry.kind == 'directory':
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157 continue
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158 frompath = self.recode(paths[0] + '/' + name)
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159 topath = self.recode(paths[1] + '/' + name)
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160 # register the files as changed
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161 changes.append((frompath, revid))
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162 changes.append((topath, revid))
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163 # add to mode cache
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164 mode = ((entry.executable and 'x') or (entry.kind == 'symlink' and 's')
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165 or '')
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166 self._modecache[(topath, revid)] = mode
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167 # register the change as move
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168 renames[topath] = frompath
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169
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170 # no futher changes, go to the next change
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171 continue
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172
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173 # we got unicode paths, need to convert them
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174 path, topath = [self.recode(part) for part in paths]
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175
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176 if topath is None:
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177 # file deleted
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178 changes.append((path, revid))
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179 continue
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180
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181 # renamed
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182 if path and path != topath:
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183 renames[topath] = path
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184
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185 # populate the mode cache
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186 kind, executable = [e[1] for e in (kind, executable)]
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187 mode = ((executable and 'x') or (kind == 'symlink' and 's')
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188 or '')
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189 self._modecache[(topath, revid)] = mode
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190 changes.append((topath, revid))
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191
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192 return changes, renames
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193
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194 def _filterghosts(self, ids):
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195 """Filters out ghost revisions which hg does not support, see
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196 <http://bazaar-vcs.org/GhostRevision>
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197 """
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198 parentmap = self.sourcerepo.get_parent_map(ids)
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199 parents = tuple(parent for parent in ids if parent in parentmap)
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200 return parents
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201
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202 def recode(self, s, encoding=None):
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203 """This version of recode tries to encode unicode to bytecode,
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204 and preferably using the UTF-8 codec.
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205 Other types than Unicode are silently returned, this is by
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206 intention, e.g. the None-type is not going to be encoded but instead
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207 just passed through
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208 """
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209 if not encoding:
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210 encoding = self.encoding or 'utf-8'
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211
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212 if isinstance(s, unicode):
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213 return s.encode(encoding)
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214 else:
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215 # leave it alone
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216 return s
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