Mercurial > hg > hg-git

annotate git_handler.py @ 38:f0daee676e10

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
successful push to an upstream git server - BOOYAH!
author Scott Chacon <schacon@gmail.com>
date Tue, 28 Apr 2009 14:28:27 -0700
parents 7046d792dfcd
children 173e738d0da4
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1 import os, errno, sys, time, datetime, pickle, copy
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2 import dulwich
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3 from dulwich.repo import Repo
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4 from dulwich.client import SimpleFetchGraphWalker
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5 from hgext import bookmarks
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6 from mercurial.i18n import _
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7 from mercurial.node import bin, hex, nullid
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8 from mercurial import hg, util, context, error
38
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9 from dulwich.objects import (
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10 Blob,
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11 Commit,
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12 ShaFile,
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13 Tag,
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14 Tree,
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15 hex_to_sha
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16 )
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17
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18 import math
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19
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20 def seconds_to_offset(time):
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21 hours = (float(time) / 60 / 60)
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22 hour_diff = math.fmod(time, 60)
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23 minutes = int(hour_diff)
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24 hours = int(math.floor(hours))
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25 if hours > 12:
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26 sign = '+'
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27 hours = 12 - (hours - 12)
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28 else:
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29 sign = '-'
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30 return sign + str(hours).rjust(2, '0') + str(minutes).rjust(2, '0')
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31
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32 def offset_to_seconds(offset):
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33 if len(offset) == 5:
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34 sign = offset[0:1]
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35 hours = int(offset[1:3])
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36 minutes = int(offset[3:5])
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37 if sign == '+':
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38 hours = 12 + (12 - hours)
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39 return (hours * 60 * 60) + (minutes) * 60
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40 else:
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41 return 0
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42
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43 class GitHandler(object):
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44
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45 def __init__(self, dest_repo, ui):
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46 self.repo = dest_repo
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47 self.ui = ui
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48 self.init_if_missing()
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49 self.load_git()
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50 self.load_map()
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51 self.load_config()
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52
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53 # make the git data directory
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54 def init_if_missing(self):
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55 git_hg_path = os.path.join(self.repo.path, 'git')
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56 if not os.path.exists(git_hg_path):
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57 os.mkdir(git_hg_path)
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58 dulwich.repo.Repo.init_bare(git_hg_path)
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59
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60 def load_git(self):
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61 git_dir = os.path.join(self.repo.path, 'git')
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62 self.git = Repo(git_dir)
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63
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64 ## FILE LOAD AND SAVE METHODS
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65
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66 def map_set(self, gitsha, hgsha):
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67 self._map_git[gitsha] = hgsha
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68 self._map_hg[hgsha] = gitsha
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69
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70 def map_hg_get(self, gitsha):
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71 if gitsha in self._map_git:
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72 return self._map_git[gitsha]
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73 else:
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74 return None
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75
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76 def map_git_get(self, hgsha):
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77 if hgsha in self._map_hg:
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78 return self._map_hg[hgsha]
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79 else:
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80 return None
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81
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82 def load_map(self):
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83 self._map_git = {}
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84 self._map_hg = {}
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85 if os.path.exists(self.repo.join('git-mapfile')):
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86 for line in self.repo.opener('git-mapfile'):
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87 gitsha, hgsha = line.strip().split(' ', 1)
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88 self._map_git[gitsha] = hgsha
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89 self._map_hg[hgsha] = gitsha
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90
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91 def save_map(self):
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92 file = self.repo.opener('git-mapfile', 'w+')
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93 for gitsha, hgsha in self._map_git.iteritems():
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94 file.write("%s %s\n" % (gitsha, hgsha))
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95 file.close()
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96
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97 def load_config(self):
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98 self._config = {}
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99 if os.path.exists(self.repo.join('git-config')):
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100 for line in self.repo.opener('git-config'):
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101 key, value = line.strip().split(' ', 1)
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102 self._config[key] = value
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103
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104 def save_config(self):
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105 file = self.repo.opener('git-config', 'w+')
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106 for key, value in self._config.iteritems():
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107 file.write("%s %s\n" % (key, value))
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108 file.close()
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109
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110
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111 ## END FILE LOAD AND SAVE METHODS
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112
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113 def fetch(self, remote_name):
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114 self.ui.status(_("fetching from : " + remote_name + "\n"))
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115 self.export_git_objects()
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116 self.fetch_pack(remote_name)
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117 self.import_git_objects(remote_name)
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118 self.save_map()
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119
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120 def push(self, remote_name):
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121 self.ui.status(_("pushing to : " + remote_name + "\n"))
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122 self.export_git_objects()
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123 self.update_references()
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124 self.upload_pack(remote_name)
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125 self.save_map()
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126
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127 # TODO: make these actually save and recall
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128 def remote_add(self, remote_name, git_url):
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129 self._config['remote.' + remote_name + '.url'] = git_url
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130 self.save_config()
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131
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132 def remote_name_to_url(self, remote_name):
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133 return self._config['remote.' + remote_name + '.url']
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134
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135 def update_references(self):
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136 # TODO : if bookmarks exist, add them as git branches
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137 c = self.map_git_get(hex(self.repo.changelog.tip()))
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138 self.git.set_ref('refs/heads/master', c)
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139
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140 def export_git_objects(self):
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141 print "exporting git objects"
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142 for rev in self.repo.changelog:
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143 self.export_hg_commit(rev)
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144
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145 # convert this commit into git objects
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146 # go through the manifest, convert all blobs/trees we don't have
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147 # write the commit object (with metadata info)
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148 def export_hg_commit(self, rev):
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149 # return if we've already processed this
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150 node = self.repo.changelog.lookup(rev)
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151 phgsha = hex(node)
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152 pgit_sha = self.map_git_get(phgsha)
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153 if pgit_sha:
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154 return pgit_sha
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155
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156 print "converting revision " + str(rev)
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157
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158 # make sure parents are converted first
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159 parents = self.repo.parents(rev)
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160 for parent in parents:
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161 p_rev = parent.rev()
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162 hgsha = hex(parent.node())
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163 git_sha = self.map_git_get(hgsha)
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164 if not p_rev == -1:
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165 if not git_sha:
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166 self.export_hg_commit(p_rev)
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167
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168 ctx = self.repo.changectx(rev)
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169 tree_sha = self.write_git_tree(ctx)
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170
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171 # TODO : something with tags?
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172 # TODO : explicit file renaming, copying?
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173
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174 commit = {}
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175 commit['tree'] = tree_sha
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176 (time, timezone) = ctx.date()
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177 commit['author'] = ctx.user() + ' ' + str(int(time)) + ' ' + seconds_to_offset(timezone)
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178 message = ctx.description()
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179 commit['message'] = ctx.description()
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180 commit['message'] += "\n\n--HG EXTRAS--\n"
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181 commit['message'] += "branch : " + ctx.branch() + "\n"
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182
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183 commit['parents'] = []
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184 for parent in parents:
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185 hgsha = hex(parent.node())
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186 git_sha = self.map_git_get(hgsha)
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187 if git_sha:
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188 commit['parents'].append(git_sha)
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189
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190 commit_sha = self.git.write_commit_hash(commit) # writing new blobs to git
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191 self.map_set(commit_sha, phgsha)
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192 return commit_sha
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193
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194 def write_git_tree(self, ctx):
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195 trees = {}
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196 man = ctx.manifest()
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197 for filenm in man.keys():
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198 # write blob if not in our git database
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199 fctx = ctx.filectx(filenm)
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200 is_exec = 'x' in fctx.flags()
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201 is_link = 'l' in fctx.flags()
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202 file_id = hex(fctx.filenode())
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203 blob_sha = self.map_git_get(file_id)
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204 if not blob_sha:
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205 blob_sha = self.git.write_blob(fctx.data()) # writing new blobs to git
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206 self.map_set(blob_sha, file_id)
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207
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208 parts = filenm.split('/')
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209 if len(parts) > 1:
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210
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211 # get filename and path for leading subdir
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212 filepath = parts[-1:][0]
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213 dirpath = "/".join([v for v in parts[0:-1]]) + '/'
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214
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215 # get subdir name and path for parent dir
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216 parentsub = parts[-2:][0]
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217 parentpath = "/".join([v for v in parts[0:-2]]) + '/'
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218
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219 # set file entry
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220 fileentry = ['blob', filepath, blob_sha, is_exec, is_link]
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221 if dirpath not in trees:
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222 trees[dirpath] = []
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223 trees[dirpath].append(fileentry)
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224
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225 # set directory entry
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226 treeentry = ['tree', parentsub + '/', dirpath]
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227 if parentpath not in trees:
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228 trees[parentpath] = []
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229 if treeentry not in trees[parentpath]:
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230 trees[parentpath].append( treeentry )
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231 else:
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232 fileentry = ['blob', parts[0], blob_sha, is_exec, is_link]
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233 if '/' not in trees:
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234 trees['/'] = []
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235 trees['/'].append(fileentry)
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236
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237 # sort by tree depth, so we write the deepest trees first
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238 dirs = trees.keys()
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239 dirs.sort(lambda a, b: len(b.split('/'))-len(a.split('/')))
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240
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241 # write all the trees
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242 tree_sha = None
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243 tree_shas = {}
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244 for dirnm in dirs:
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245 tree_data = []
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246 for entry in trees[dirnm]:
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247 # replace tree path with tree SHA
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248 if entry[0] == 'tree':
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249 sha = tree_shas[entry[2]]
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250 entry[2] = sha
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251 tree_data.append(entry)
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252 tree_sha = self.git.write_tree_array(tree_data) # writing new trees to git
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253 tree_shas[dirnm] = tree_sha
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254 return tree_sha # should be the last root tree sha
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255
13
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256 def remote_head(self, remote_name):
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257 for head, sha in self.git.remote_refs(remote_name).iteritems():
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258 if head == 'HEAD':
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259 return self.map_hg_get(sha)
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260 return None
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261
17
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262 def upload_pack(self, remote_name):
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263 git_url = self.remote_name_to_url(remote_name)
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264 client, path = self.get_transport_and_path(git_url)
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265 changed = self.get_changed_refs
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266 genpack = self.generate_pack_contents
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267 try:
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268 client.send_pack(path, changed, genpack)
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269 # TODO : self.git.set_remote_refs(refs, remote_name)
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270 except:
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271 raise
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272
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273 # TODO : for now, we'll just push all heads
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274 # * we should have specified push, tracking branches and --all
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275 # takes a dict of refs:shas from the server and returns what should be
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276 # pushed up
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277 def get_changed_refs(self, refs):
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278 keys = refs.keys()
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279 if not keys:
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280 return None
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281 changed = []
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282 for ref_name in keys:
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283 parts = ref_name.split('/')
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284 if parts[0] == 'refs': # strip off 'refs/heads'
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285 if parts[1] == 'heads':
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286 head = "/".join([v for v in parts[2:]])
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287 local_ref = self.git.ref(ref_name)
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288 if local_ref:
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289 if not local_ref == refs[ref_name]:
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290 changed.append((refs[ref_name], local_ref, ref_name))
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291 return changed
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292
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293 # takes a list of shas the server wants and shas the server has
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294 # and generates a list of commit shas we need to push up
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295 def generate_pack_contents(self, want, have):
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296 graph_walker = SimpleFetchGraphWalker(want, self.git.get_parents)
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297 next = graph_walker.next()
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298 shas = []
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299 while next:
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300 if next in have:
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301 graph_walker.ack(next)
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302 else:
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303 shas.append(next)
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304 next = graph_walker.next()
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305
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306 # so now i have the shas, need to turn them into a list of
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307 # tuples (sha, path) for ALL the objects i'm sending
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308 # TODO : don't send blobs or trees they already have
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309 def get_objects(tree, path):
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310 changes = list()
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311 changes.append((tree, path))
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312 for (mode, name, sha) in tree.entries():
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313 if mode == 57344: # TODO : properly handle submodules
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314 continue
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315 obj = self.git.get_object(sha)
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316 if isinstance (obj, Blob):
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317 changes.append((obj, path + name))
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318 elif isinstance(obj, Tree):
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319 changes.extend (get_objects (obj, path + name + '/'))
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320 return changes
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321
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322 objects = []
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323 for commit_sha in shas:
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324 commit = self.git.commit(commit_sha)
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325 objects.append((commit, 'commit'))
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326 tree = self.git.get_object(commit.tree)
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327 objects.extend( get_objects(tree, '/') )
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328
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329 return objects
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330
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331 def fetch_pack(self, remote_name):
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332 git_url = self.remote_name_to_url(remote_name)
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333 client, path = self.get_transport_and_path(git_url)
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334 graphwalker = SimpleFetchGraphWalker(self.git.heads().values(), self.git.get_parents)
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335 f, commit = self.git.object_store.add_pack()
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336 try:
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337 determine_wants = self.git.object_store.determine_wants_all
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338 refs = client.fetch_pack(path, determine_wants, graphwalker, f.write, sys.stdout.write)
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339 f.close()
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340 commit()
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341 self.git.set_remote_refs(refs, remote_name)
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342 except:
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343 f.close()
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344 raise
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345
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346 def import_git_objects(self, remote_name):
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347 self.ui.status(_("importing Git objects into Hg\n"))
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348 # import heads as remote references
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349 todo = []
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350 done = set()
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351 convert_list = {}
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352
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353 # get a list of all the head shas
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354 for head, sha in self.git.remote_refs(remote_name).iteritems():
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355 todo.append(sha)
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356
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357 # traverse the heads getting a list of all the unique commits
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358 # TODO : stop when we hit a SHA we've already imported
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359 while todo:
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360 sha = todo.pop()
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361 assert isinstance(sha, str)
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362 if sha in done:
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363 continue
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364 done.add(sha)
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365 try:
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366 commit = self.git.commit(sha)
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367 convert_list[sha] = commit
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368 todo.extend([p for p in commit.parents if p not in done])
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369 except:
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370 print "Cannot import tags yet" # TODO
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371
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372 # sort the commits
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373 commits = TopoSort(convert_list).items()
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374
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375 # import each of the commits, oldest first
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376 for csha in commits:
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377 commit = convert_list[csha]
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378 self.import_git_commit(commit)
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379
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380 # update Hg bookmarks
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381 bms = {}
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382 for head, sha in self.git.remote_refs(remote_name).iteritems():
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383 hgsha = hex_to_sha(self.map_hg_get(sha))
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384 if not head == 'HEAD':
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385 bms[remote_name + '/' + head] = hgsha
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diff changeset
386 try:
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387 bookmarks.write(self.repo, bms)
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388 except AttributeError:
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389 self.repo.ui.warn('creating bookmarks failed, do you have'
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diff changeset
390 ' bookmarks enabled?\n')
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391
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392 def import_git_commit(self, commit):
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diff changeset
393 print "importing: " + commit.id
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diff changeset
394 # TODO : look for HG metadata in the message and use it
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diff changeset
395 # TODO : add extra Git data (committer info) as extras to changeset
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diff changeset
396
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diff changeset
397 # TODO : (?) have to handle merge contexts at some point (two parent files, etc)
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diff changeset
398 # TODO : throw IOError for removed files
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diff changeset
399 def getfilectx(repo, memctx, f):
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diff changeset
400 (e, sha, data) = self.git.get_file(commit, f)
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diff changeset
401 e = '' # TODO : make this a real mode
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diff changeset
402 return context.memfilectx(f, data, 'l' in e, 'x' in e, None)
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diff changeset
403
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diff changeset
404 p1 = "0" * 40
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diff changeset
405 p2 = "0" * 40
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diff changeset
406 if len(commit.parents) > 0:
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diff changeset
407 sha = commit.parents[0]
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diff changeset
408 p1 = self.map_hg_get(sha)
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diff changeset
409 if len(commit.parents) > 1:
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diff changeset
410 sha = commit.parents[1]
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diff changeset
411 p2 = self.map_hg_get(sha)
7
89992b6d2eef mapping parents properly now
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parents: 6
diff changeset
412 if len(commit.parents) > 2:
89992b6d2eef mapping parents properly now
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parents: 6
diff changeset
413 # TODO : map extra parents to the extras file
89992b6d2eef mapping parents properly now
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parents: 6
diff changeset
414 pass
6
c77197123d95 importing basic, mostly stubbed changesets
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parents: 5
diff changeset
415
8
2548735d24ef will now more or less correctly determine a changelist from a git commit
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parents: 7
diff changeset
416 files = self.git.get_files_changed(commit)
9
7e776864b301 sorts the commits topologically before converting
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diff changeset
417 #print files
6
c77197123d95 importing basic, mostly stubbed changesets
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parents: 5
diff changeset
418
c77197123d95 importing basic, mostly stubbed changesets
Scott Chacon <schacon@gmail.com>
parents: 5
diff changeset
419 # get a list of the changed, added, removed files
7
89992b6d2eef mapping parents properly now
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parents: 6
diff changeset
420 extra = {}
6
c77197123d95 importing basic, mostly stubbed changesets
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parents: 5
diff changeset
421 text = commit.message
7
89992b6d2eef mapping parents properly now
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parents: 6
diff changeset
422 date = datetime.datetime.fromtimestamp(commit.author_time).strftime("%Y-%m-%d %H:%M:%S")
6
c77197123d95 importing basic, mostly stubbed changesets
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parents: 5
diff changeset
423 ctx = context.memctx(self.repo, (p1, p2), text, files, getfilectx,
c77197123d95 importing basic, mostly stubbed changesets
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diff changeset
424 commit.author, date, extra)
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parents: 5
diff changeset
425 a = self.repo.commitctx(ctx)
7
89992b6d2eef mapping parents properly now
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parents: 6
diff changeset
426
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parents: 6
diff changeset
427 # get changeset id
89992b6d2eef mapping parents properly now
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428 p2 = hex(self.repo.changelog.tip())
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diff changeset
429 # save changeset to mapping file
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diff changeset
430 gitsha = commit.id
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13b9a020e382 gpush coming along. will now write blobs it doesn't have yet to git repo.
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431 self.map_set(gitsha, p2)
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2be9c0bd88af Warn, but don't fail when bookmarks is not enabled.
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432
6
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433 def getfilectx(self, source, repo, memctx, f):
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434 v = files[f]
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diff changeset
435 data = source.getfile(f, v)
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parents: 5
diff changeset
436 e = source.getmode(f, v)
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parents: 5
diff changeset
437 return context.memfilectx(f, data, 'l' in e, 'x' in e, copies.get(f))
5
d6c443a91b18 refactored the git handling stuff out into another class
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parents:
diff changeset
438
d6c443a91b18 refactored the git handling stuff out into another class
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parents:
diff changeset
439 def check_bookmarks(self):
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440 if self.ui.config('extensions', 'hgext.bookmarks') is not None:
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parents:
diff changeset
441 print "YOU NEED TO SETUP BOOKMARKS"
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parents:
diff changeset
442
d6c443a91b18 refactored the git handling stuff out into another class
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parents:
diff changeset
443 def get_transport_and_path(self, uri):
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parents:
diff changeset
444 from dulwich.client import TCPGitClient, SSHGitClient, SubprocessGitClient
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562fc51b991e we did the same thing, not sure why it conflicted
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diff changeset
445 for handler, transport in (("git://", TCPGitClient), ("git@", SSHGitClient), ("git+ssh://", SSHGitClient)):
5
d6c443a91b18 refactored the git handling stuff out into another class
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parents:
diff changeset
446 if uri.startswith(handler):
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a1a5391bc3c3 edit ssh command to quote the path, also convert tags properly on fetch
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diff changeset
447 if handler == 'git@':
28
b258ef16ae37 Fix non-ssh URI parsing.
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parents: 26
diff changeset
448 host, path = uri[len(handler):].split(":", 1)
26
a1a5391bc3c3 edit ssh command to quote the path, also convert tags properly on fetch
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parents: 25
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449 host = 'git@' + host
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b258ef16ae37 Fix non-ssh URI parsing.
Augie Fackler <durin42@gmail.com>
parents: 26
diff changeset
450 else:
35
562fc51b991e we did the same thing, not sure why it conflicted
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parents: 29
diff changeset
451 host, path = uri[len(handler):].split("/", 1)
26
a1a5391bc3c3 edit ssh command to quote the path, also convert tags properly on fetch
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diff changeset
452 return transport(host), '/' + path
5
d6c443a91b18 refactored the git handling stuff out into another class
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parents:
diff changeset
453 # if its not git or git+ssh, try a local url..
d6c443a91b18 refactored the git handling stuff out into another class
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parents:
diff changeset
454 return SubprocessGitClient(), uri
9
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parents: 8
diff changeset
455
26
a1a5391bc3c3 edit ssh command to quote the path, also convert tags properly on fetch
Scott Chacon <schacon@gmail.com>
parents: 25
diff changeset
456 ''
9
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parents: 8
diff changeset
457 """
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
458 Tarjan's algorithm and topological sorting implementation in Python
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parents: 8
diff changeset
459 by Paul Harrison
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
460 Public domain, do with it as you will
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
461 """
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
462 class TopoSort(object):
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2be9c0bd88af Warn, but don't fail when bookmarks is not enabled.
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parents: 17
diff changeset
463
9
7e776864b301 sorts the commits topologically before converting
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diff changeset
464 def __init__(self, commitdict):
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parents: 8
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465 self._sorted = self.robust_topological_sort(commitdict)
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diff changeset
466 self._shas = []
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diff changeset
467 for level in self._sorted:
11
f2826f7b1ae5 sped up large imports significantly by caching parsed trees and sha_to_hexes
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parents: 10
diff changeset
468 for sha in level:
f2826f7b1ae5 sped up large imports significantly by caching parsed trees and sha_to_hexes
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diff changeset
469 self._shas.append(sha)
19
2be9c0bd88af Warn, but don't fail when bookmarks is not enabled.
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parents: 17
diff changeset
470
9
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diff changeset
471 def items(self):
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parents: 8
diff changeset
472 self._shas.reverse()
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parents: 8
diff changeset
473 return self._shas
19
2be9c0bd88af Warn, but don't fail when bookmarks is not enabled.
Augie Fackler <durin42@gmail.com>
parents: 17
diff changeset
474
9
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
475 def strongly_connected_components(self, graph):
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parents: 8
diff changeset
476 """ Find the strongly connected components in a graph using
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
477 Tarjan's algorithm.
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
478
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parents: 8
diff changeset
479 graph should be a dictionary mapping node names to
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
480 lists of successor nodes.
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
481 """
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
482
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parents: 8
diff changeset
483 result = [ ]
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
484 stack = [ ]
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parents: 8
diff changeset
485 low = { }
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parents: 8
diff changeset
486
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parents: 8
diff changeset
487 def visit(node):
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parents: 8
diff changeset
488 if node in low: return
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
489
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parents: 8
diff changeset
490 num = len(low)
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parents: 8
diff changeset
491 low[node] = num
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
492 stack_pos = len(stack)
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parents: 8
diff changeset
493 stack.append(node)
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
494
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
495 for successor in graph[node].parents:
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
496 visit(successor)
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parents: 8
diff changeset
497 low[node] = min(low[node], low[successor])
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parents: 8
diff changeset
498
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
499 if num == low[node]:
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
500 component = tuple(stack[stack_pos:])
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
501 del stack[stack_pos:]
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parents: 8
diff changeset
502 result.append(component)
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
503 for item in component:
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
504 low[item] = len(graph)
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
505
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
506 for node in graph:
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
507 visit(node)
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
508
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
509 return result
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
510
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
511
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
512 def topological_sort(self, graph):
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
513 count = { }
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parents: 8
diff changeset
514 for node in graph:
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
515 count[node] = 0
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
516 for node in graph:
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
517 for successor in graph[node]:
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
518 count[successor] += 1
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
519
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
520 ready = [ node for node in graph if count[node] == 0 ]
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
521
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
522 result = [ ]
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parents: 8
diff changeset
523 while ready:
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
524 node = ready.pop(-1)
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parents: 8
diff changeset
525 result.append(node)
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
526
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
527 for successor in graph[node]:
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
528 count[successor] -= 1
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Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
529 if count[successor] == 0:
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
530 ready.append(successor)
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
531
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
532 return result
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
533
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
534
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
535 def robust_topological_sort(self, graph):
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parents: 8
diff changeset
536 """ First identify strongly connected components,
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
537 then perform a topological sort on these components. """
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
538
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
539 components = self.strongly_connected_components(graph)
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Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
540
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
541 node_component = { }
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
542 for component in components:
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
543 for node in component:
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
544 node_component[node] = component
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
545
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parents: 8
diff changeset
546 component_graph = { }
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parents: 8
diff changeset
547 for component in components:
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
548 component_graph[component] = [ ]
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
549
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Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
550 for node in graph:
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parents: 8
diff changeset
551 node_c = node_component[node]
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parents: 8
diff changeset
552 for successor in graph[node].parents:
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parents: 8
diff changeset
553 successor_c = node_component[successor]
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
554 if node_c != successor_c:
19
2be9c0bd88af Warn, but don't fail when bookmarks is not enabled.
Augie Fackler <durin42@gmail.com>
parents: 17
diff changeset
555 component_graph[node_c].append(successor_c)
9
7e776864b301 sorts the commits topologically before converting
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parents: 8
diff changeset
556
7e776864b301 sorts the commits topologically before converting
Scott Chacon <schacon@gmail.com>
parents: 8
diff changeset
557 return self.topological_sort(component_graph)