Mercurial > hg
annotate mercurial/changegroup.py @ 17509:f7767f52e9eb
spelling: recursion
author | timeless@mozdev.org |
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date | Fri, 17 Aug 2012 13:58:18 -0700 |
parents | 9dba55369cd8 |
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1 # changegroup.py - Mercurial changegroup manipulation functions |
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2 # |
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3 # Copyright 2006 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
3891 | 8 from i18n import _ |
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9 from node import nullrev |
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10 import mdiff, util |
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11 import struct, os, bz2, zlib, tempfile |
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12 |
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13 _BUNDLE10_DELTA_HEADER = "20s20s20s20s" |
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14 |
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15 def readexactly(stream, n): |
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16 '''read n bytes from stream.read and abort if less was available''' |
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17 s = stream.read(n) |
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18 if len(s) < n: |
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19 raise util.Abort(_("stream ended unexpectedly" |
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20 " (got %d bytes, expected %d)") |
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21 % (len(s), n)) |
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22 return s |
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23 |
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24 def getchunk(stream): |
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25 """return the next chunk from stream as a string""" |
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26 d = readexactly(stream, 4) |
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27 l = struct.unpack(">l", d)[0] |
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28 if l <= 4: |
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29 if l: |
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30 raise util.Abort(_("invalid chunk length %d") % l) |
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31 return "" |
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32 return readexactly(stream, l - 4) |
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33 |
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34 def chunkheader(length): |
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35 """return a changegroup chunk header (string)""" |
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36 return struct.pack(">l", length + 4) |
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37 |
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38 def closechunk(): |
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39 """return a changegroup chunk header (string) for a zero-length chunk""" |
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40 return struct.pack(">l", 0) |
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41 |
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42 class nocompress(object): |
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43 def compress(self, x): |
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44 return x |
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45 def flush(self): |
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46 return "" |
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47 |
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48 bundletypes = { |
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49 "": ("", nocompress), # only when using unbundle on ssh and old http servers |
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50 # since the unification ssh accepts a header but there |
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51 # is no capability signaling it. |
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52 "HG10UN": ("HG10UN", nocompress), |
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53 "HG10BZ": ("HG10", lambda: bz2.BZ2Compressor()), |
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54 "HG10GZ": ("HG10GZ", lambda: zlib.compressobj()), |
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55 } |
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56 |
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58 bundlepriority = ['HG10GZ', 'HG10BZ', 'HG10UN'] |
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59 |
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60 def writebundle(cg, filename, bundletype): |
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61 """Write a bundle file and return its filename. |
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62 |
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63 Existing files will not be overwritten. |
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64 If no filename is specified, a temporary file is created. |
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65 bz2 compression can be turned off. |
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66 The bundle file will be deleted in case of errors. |
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67 """ |
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68 |
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69 fh = None |
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70 cleanup = None |
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71 try: |
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72 if filename: |
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73 fh = open(filename, "wb") |
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74 else: |
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75 fd, filename = tempfile.mkstemp(prefix="hg-bundle-", suffix=".hg") |
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76 fh = os.fdopen(fd, "wb") |
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77 cleanup = filename |
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78 |
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79 header, compressor = bundletypes[bundletype] |
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80 fh.write(header) |
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81 z = compressor() |
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82 |
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83 # parse the changegroup data, otherwise we will block |
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84 # in case of sshrepo because we don't know the end of the stream |
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85 |
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86 # an empty chunkgroup is the end of the changegroup |
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87 # a changegroup has at least 2 chunkgroups (changelog and manifest). |
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88 # after that, an empty chunkgroup is the end of the changegroup |
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89 empty = False |
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90 count = 0 |
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91 while not empty or count <= 2: |
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92 empty = True |
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93 count += 1 |
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94 while True: |
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95 chunk = getchunk(cg) |
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96 if not chunk: |
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97 break |
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98 empty = False |
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99 fh.write(z.compress(chunkheader(len(chunk)))) |
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100 pos = 0 |
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101 while pos < len(chunk): |
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102 next = pos + 2**20 |
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103 fh.write(z.compress(chunk[pos:next])) |
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104 pos = next |
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105 fh.write(z.compress(closechunk())) |
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106 fh.write(z.flush()) |
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107 cleanup = None |
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108 return filename |
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109 finally: |
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110 if fh is not None: |
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111 fh.close() |
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112 if cleanup is not None: |
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113 os.unlink(cleanup) |
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114 |
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115 def decompressor(fh, alg): |
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116 if alg == 'UN': |
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117 return fh |
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118 elif alg == 'GZ': |
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119 def generator(f): |
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120 zd = zlib.decompressobj() |
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121 for chunk in util.filechunkiter(f): |
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122 yield zd.decompress(chunk) |
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123 elif alg == 'BZ': |
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124 def generator(f): |
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125 zd = bz2.BZ2Decompressor() |
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126 zd.decompress("BZ") |
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127 for chunk in util.filechunkiter(f, 4096): |
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128 yield zd.decompress(chunk) |
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129 else: |
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130 raise util.Abort("unknown bundle compression '%s'" % alg) |
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131 return util.chunkbuffer(generator(fh)) |
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132 |
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133 class unbundle10(object): |
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134 deltaheader = _BUNDLE10_DELTA_HEADER |
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135 deltaheadersize = struct.calcsize(deltaheader) |
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136 def __init__(self, fh, alg): |
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137 self._stream = decompressor(fh, alg) |
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138 self._type = alg |
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139 self.callback = None |
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140 def compressed(self): |
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141 return self._type != 'UN' |
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142 def read(self, l): |
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143 return self._stream.read(l) |
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144 def seek(self, pos): |
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145 return self._stream.seek(pos) |
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146 def tell(self): |
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147 return self._stream.tell() |
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148 def close(self): |
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149 return self._stream.close() |
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150 |
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151 def chunklength(self): |
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152 d = readexactly(self._stream, 4) |
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153 l = struct.unpack(">l", d)[0] |
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154 if l <= 4: |
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155 if l: |
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156 raise util.Abort(_("invalid chunk length %d") % l) |
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157 return 0 |
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158 if self.callback: |
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159 self.callback() |
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160 return l - 4 |
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161 |
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162 def changelogheader(self): |
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163 """v10 does not have a changelog header chunk""" |
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164 return {} |
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165 |
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166 def manifestheader(self): |
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167 """v10 does not have a manifest header chunk""" |
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168 return {} |
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169 |
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170 def filelogheader(self): |
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171 """return the header of the filelogs chunk, v10 only has the filename""" |
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172 l = self.chunklength() |
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173 if not l: |
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174 return {} |
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175 fname = readexactly(self._stream, l) |
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176 return dict(filename=fname) |
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177 |
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178 def _deltaheader(self, headertuple, prevnode): |
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179 node, p1, p2, cs = headertuple |
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180 if prevnode is None: |
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181 deltabase = p1 |
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182 else: |
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183 deltabase = prevnode |
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184 return node, p1, p2, deltabase, cs |
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185 |
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186 def deltachunk(self, prevnode): |
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187 l = self.chunklength() |
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188 if not l: |
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189 return {} |
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190 headerdata = readexactly(self._stream, self.deltaheadersize) |
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191 header = struct.unpack(self.deltaheader, headerdata) |
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192 delta = readexactly(self._stream, l - self.deltaheadersize) |
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193 node, p1, p2, deltabase, cs = self._deltaheader(header, prevnode) |
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194 return dict(node=node, p1=p1, p2=p2, cs=cs, |
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195 deltabase=deltabase, delta=delta) |
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196 |
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197 class headerlessfixup(object): |
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198 def __init__(self, fh, h): |
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199 self._h = h |
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200 self._fh = fh |
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201 def read(self, n): |
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202 if self._h: |
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203 d, self._h = self._h[:n], self._h[n:] |
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204 if len(d) < n: |
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205 d += readexactly(self._fh, n - len(d)) |
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206 return d |
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207 return readexactly(self._fh, n) |
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208 |
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209 def readbundle(fh, fname): |
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210 header = readexactly(fh, 6) |
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211 |
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212 if not fname: |
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213 fname = "stream" |
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214 if not header.startswith('HG') and header.startswith('\0'): |
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215 fh = headerlessfixup(fh, header) |
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216 header = "HG10UN" |
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217 |
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218 magic, version, alg = header[0:2], header[2:4], header[4:6] |
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219 |
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220 if magic != 'HG': |
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221 raise util.Abort(_('%s: not a Mercurial bundle') % fname) |
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222 if version != '10': |
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223 raise util.Abort(_('%s: unknown bundle version %s') % (fname, version)) |
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224 return unbundle10(fh, alg) |
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225 |
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226 class bundle10(object): |
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227 deltaheader = _BUNDLE10_DELTA_HEADER |
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228 def __init__(self, lookup): |
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229 self._lookup = lookup |
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230 def close(self): |
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231 return closechunk() |
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232 def fileheader(self, fname): |
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233 return chunkheader(len(fname)) + fname |
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234 def revchunk(self, revlog, rev, prev): |
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235 node = revlog.node(rev) |
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236 p1, p2 = revlog.parentrevs(rev) |
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237 base = prev |
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238 |
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239 prefix = '' |
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240 if base == nullrev: |
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241 delta = revlog.revision(node) |
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242 prefix = mdiff.trivialdiffheader(len(delta)) |
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243 else: |
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244 delta = revlog.revdiff(base, rev) |
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245 linknode = self._lookup(revlog, node) |
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246 p1n, p2n = revlog.parents(node) |
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247 basenode = revlog.node(base) |
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248 meta = self.builddeltaheader(node, p1n, p2n, basenode, linknode) |
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249 meta += prefix |
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250 l = len(meta) + len(delta) |
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251 yield chunkheader(l) |
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252 yield meta |
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253 yield delta |
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254 def builddeltaheader(self, node, p1n, p2n, basenode, linknode): |
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255 # do nothing with basenode, it is implicitly the previous one in HG10 |
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256 return struct.pack(self.deltaheader, node, p1n, p2n, linknode) |