annotate contrib/convert-repo @ 316:c48d069163d6

Add new convert-repo script -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Add new convert-repo script This is the beginnings of a generalized framework for converting repositories. Currently hardwired to convert from git to hg. manifest hash: dc3b72de2c45bfdaffcc1cf71da530228793facd -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) iD8DBQFCrGf/ywK+sNU5EO8RAi9EAJ0eQ++cwSgn5j2PHiTvF7r3JNiv4gCePY+X do12pUvCczyBKVCoBN7y/uI= =YtzI -----END PGP SIGNATURE-----
author mpm@selenic.com
date Sun, 12 Jun 2005 08:51:11 -0800
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children dfc44f3f587c
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1 #!/usr/bin/env python
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2 #
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3 # This is a generalized framework for converting between SCM
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4 # repository formats.
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5 #
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6 # In its current form, it's hardcoded to convert incrementally between
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7 # git and Mercurial.
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8 #
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9 # To use, you must first import the first git version into Mercurial,
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10 # and establish a mapping between the git commit hash and the hash in
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11 # Mercurial for that version. This mapping is kept in a simple text
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12 # file with lines like so:
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13 #
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14 # <git hash> <mercurial hash>
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15 #
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16 # To convert the rest of the repo, run:
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17 #
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18 # convert-repo <git-dir> <hg-dir> <mapfile>
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19 #
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20 # This updates the mapfile on each commit copied, so it can be
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21 # interrupted and can be run repeatedly to copy new commits.
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22
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23 import sys, os, zlib, sha
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24 from mercurial import hg, ui
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25
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26 class convert_git:
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27 def __init__(self, path):
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28 self.path = path
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29
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30 def getheads(self):
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31 h = file(self.path + "/.git/HEAD").read()[:-1]
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32 return [h]
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33
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34 def getfile(self, name, rev):
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35 a = file(self.path + ("/.git/objects/%s/%s"
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36 % (rev[:2], rev[2:]))).read()
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37 b = zlib.decompress(a)
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38 if sha.sha(b).hexdigest() != rev: raise "bad hash"
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39 head, text = b.split('\0', 1)
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40 return text
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41
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42 def getchanges(self, version):
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43 path = os.getcwd()
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44 os.chdir(self.path)
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45 fh = os.popen("git-diff-tree -m -r %s" % (version))
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46 os.chdir(path)
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47
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48 changes = []
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49 for l in fh:
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50 if "\t" not in l: continue
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51 m, f = l[:-1].split("\t")
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52 m = m.split()
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53 h = m[3]
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54 p = (m[1] == "100755")
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55 changes.append((f, h, p))
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56 return changes
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57
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58 def getcommit(self, version):
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59 c = self.getfile("", version) # read the commit hash
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60 end = c.find("\n\n")
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61 message = c[end+2:]
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62 l = c[:end].splitlines()
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63 manifest = l[0].split()[1]
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64 parents = []
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65 for e in l[1:]:
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66 n,v = e.split(" ", 1)
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67 if n == "author":
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68 p = v.split()
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69 date = " ".join(p[-2:])
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70 author = " ".join(p[:-2])
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71 if author[0] == "<": author = author[1:-1]
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72 if n == "parent": parents.append(v)
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73 return (parents, author, date, message)
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74
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75 class convert_mercurial:
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76 def __init__(self, path):
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77 self.path = path
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78 u = ui.ui()
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79 self.repo = hg.repository(u, path)
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80
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81 def getheads(self):
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82 h = self.repo.changelog.heads()
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83 h = [ hg.hex(x) for x in h ]
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84 return h
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85
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86 def putfile(self, f, e, data):
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87 self.repo.wfile(f, "w").write(data)
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88 hg.set_exec(self.repo.wjoin(f), e)
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89
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90 def delfile(self, f):
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91 try:
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92 os.unlink(self.repo.wjoin(f))
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93 self.repo.remove([f])
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94 except:
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95 pass
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96
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97 def putcommit(self, files, parents, author, dest, text):
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98 p1, p2 = "0"*40, "0"*40
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99 if len(parents) > 0: p1 = parents[0]
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100 if len(parents) > 1: p2 = parents[1]
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101 if len(parents) > 2: raise "the dreaded octopus merge!"
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102 self.repo.rawcommit(files, text, author, dest,
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103 hg.bin(p1), hg.bin(p2))
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104
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105 return hg.hex(self.repo.changelog.tip())
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106
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107 class convert:
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108 def __init__(self, source, dest, mapfile):
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109 self.source = source
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110 self.dest = dest
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111 self.mapfile = mapfile
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112 self.commitcache = {}
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113
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114 self.map = {}
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115 for l in file(self.mapfile):
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116 sv, dv = l[:-1].split()
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117 self.map[sv] = dv
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118
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119 def walktree(self, heads):
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120 visit = heads
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121 known = {}
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122 parents = {}
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123 while visit:
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124 n = visit.pop(0)
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125 if n in known or n in self.map: continue
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126 known[n] = 1
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127 self.commitcache[n] = self.source.getcommit(n)
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128 cp = self.commitcache[n][0]
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129 for p in cp:
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130 parents.setdefault(n, []).append(p)
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131 visit.append(p)
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132
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133 return parents
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134
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135 def toposort(self, parents):
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136 visit = parents.keys()
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137 seen = {}
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138 children = {}
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139 while visit:
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140 n = visit.pop(0)
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141 if n in seen: continue
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142 seen[n] = 1
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143 pc = 0
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144 if n in parents:
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145 for p in parents[n]:
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146 if p not in self.map: pc += 1
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147 visit.append(p)
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148 children.setdefault(p, []).append(n)
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149 if not pc: root = n
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150
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151 s = []
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152 removed = {}
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153 visit = parents.keys()
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154 while visit:
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155 n = visit.pop(0)
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156 if n in removed: continue
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157 dep = 0
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158 if n in parents:
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159 for p in parents[n]:
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160 if p in self.map: continue
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161 if p not in removed:
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162 # we're still dependent
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163 visit.append(n)
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164 dep = 1
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165 break
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166
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167 if not dep:
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168 # all n's parents are in the list
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169 removed[n] = 1
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170 s.append(n)
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171 if n in children:
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172 for c in children[n]:
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173 visit.insert(0, c)
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174
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175 return s
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176
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177 def copy(self, rev):
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178 p, a, d, t = self.commitcache[rev]
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179 files = self.source.getchanges(rev)
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180
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181 for f,v,e in files:
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182 try:
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183 data = self.source.getfile(f, v)
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184 except IOError, inst:
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185 self.dest.delfile(f)
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186 else:
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187 self.dest.putfile(f, e, data)
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188
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189 r = [self.map[v] for v in p]
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190 f = [f for f,v,e in files]
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191 self.map[rev] = self.dest.putcommit(f, r, a, d, t)
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192 file(self.mapfile, "a").write("%s %s\n" % (rev, self.map[rev]))
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193
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194 def convert(self):
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195 heads = self.source.getheads()
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196 parents = self.walktree(heads)
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197 t = self.toposort(parents)
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198 num = len(t)
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199
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200 for c in t:
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201 num -= 1
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202 if c in self.map: continue
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203 desc = self.commitcache[c][3].splitlines()[0]
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204 print num, desc
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205 self.copy(c)
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206
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207 gitpath, hgpath, mapfile = sys.argv[1:]
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208
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209 c = convert(convert_git(gitpath), convert_mercurial(hgpath), mapfile)
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210 c.convert()