author | Nishanth Amuluru <nishanth@fossee.in> |
Sun, 09 Jan 2011 11:13:36 +0530 | |
changeset 114 | 1a88b04adb39 |
parent 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
69
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# changegroup.py - Mercurial changegroup manipulation functions |
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# |
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# Copyright 2006 Matt Mackall <mpm@selenic.com> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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|
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from i18n import _ |
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import util |
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import struct, os, bz2, zlib, tempfile |
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|
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def getchunk(source): |
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"""return the next chunk from changegroup 'source' as a string""" |
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d = source.read(4) |
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if not d: |
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return "" |
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l = struct.unpack(">l", d)[0] |
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if l <= 4: |
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return "" |
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d = source.read(l - 4) |
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if len(d) < l - 4: |
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raise util.Abort(_("premature EOF reading chunk" |
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" (got %d bytes, expected %d)") |
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% (len(d), l - 4)) |
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return d |
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|
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def chunkheader(length): |
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"""return a changegroup chunk header (string)""" |
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return struct.pack(">l", length + 4) |
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def closechunk(): |
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"""return a changegroup chunk header (string) for a zero-length chunk""" |
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return struct.pack(">l", 0) |
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|
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class nocompress(object): |
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def compress(self, x): |
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return x |
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def flush(self): |
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return "" |
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|
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bundletypes = { |
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"": ("", nocompress), |
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"HG10UN": ("HG10UN", nocompress), |
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"HG10BZ": ("HG10", lambda: bz2.BZ2Compressor()), |
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"HG10GZ": ("HG10GZ", lambda: zlib.compressobj()), |
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} |
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|
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def collector(cl, mmfs, files): |
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# Gather information about changeset nodes going out in a bundle. |
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# We want to gather manifests needed and filelogs affected. |
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def collect(node): |
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c = cl.read(node) |
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files.update(c[3]) |
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mmfs.setdefault(c[0], node) |
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return collect |
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# hgweb uses this list to communicate its preferred type |
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bundlepriority = ['HG10GZ', 'HG10BZ', 'HG10UN'] |
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|
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def writebundle(cg, filename, bundletype): |
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"""Write a bundle file and return its filename. |
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Existing files will not be overwritten. |
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If no filename is specified, a temporary file is created. |
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bz2 compression can be turned off. |
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The bundle file will be deleted in case of errors. |
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""" |
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fh = None |
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cleanup = None |
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try: |
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if filename: |
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fh = open(filename, "wb") |
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else: |
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fd, filename = tempfile.mkstemp(prefix="hg-bundle-", suffix=".hg") |
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fh = os.fdopen(fd, "wb") |
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cleanup = filename |
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header, compressor = bundletypes[bundletype] |
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fh.write(header) |
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z = compressor() |
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|
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# parse the changegroup data, otherwise we will block |
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# in case of sshrepo because we don't know the end of the stream |
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85 |
|
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# an empty chunkgroup is the end of the changegroup |
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# a changegroup has at least 2 chunkgroups (changelog and manifest). |
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# after that, an empty chunkgroup is the end of the changegroup |
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empty = False |
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count = 0 |
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while not empty or count <= 2: |
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empty = True |
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count += 1 |
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while 1: |
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chunk = getchunk(cg) |
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96 |
if not chunk: |
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97 |
break |
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empty = False |
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99 |
fh.write(z.compress(chunkheader(len(chunk)))) |
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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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pos = next |
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fh.write(z.compress(closechunk())) |
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fh.write(z.flush()) |
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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 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 |
def __init__(self, fh, alg): |
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135 |
self._stream = decompressor(fh, alg) |
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136 |
self._type = alg |
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137 |
self.callback = None |
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138 |
def compressed(self): |
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139 |
return self._type != 'UN' |
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140 |
def read(self, l): |
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141 |
return self._stream.read(l) |
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142 |
def seek(self, pos): |
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143 |
return self._stream.seek(pos) |
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144 |
def tell(self): |
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145 |
return self._stream.tell() |
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146 |
def close(self): |
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147 |
return self._stream.close() |
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148 |
|
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149 |
def chunklength(self): |
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150 |
d = self.read(4) |
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151 |
if not d: |
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152 |
return 0 |
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153 |
l = max(0, struct.unpack(">l", d)[0] - 4) |
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154 |
if l and self.callback: |
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155 |
self.callback() |
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|
156 |
return l |
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|
157 |
|
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158 |
def chunk(self): |
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159 |
"""return the next chunk from changegroup 'source' as a string""" |
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160 |
l = self.chunklength() |
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|
161 |
d = self.read(l) |
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162 |
if len(d) < l: |
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163 |
raise util.Abort(_("premature EOF reading chunk" |
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164 |
" (got %d bytes, expected %d)") |
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|
165 |
% (len(d), l)) |
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|
166 |
return d |
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|
167 |
|
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|
168 |
def parsechunk(self): |
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|
169 |
l = self.chunklength() |
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|
170 |
if not l: |
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|
171 |
return {} |
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|
172 |
h = self.read(80) |
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|
173 |
node, p1, p2, cs = struct.unpack("20s20s20s20s", h) |
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|
174 |
data = self.read(l - 80) |
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175 |
return dict(node=node, p1=p1, p2=p2, cs=cs, data=data) |
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|
176 |
|
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|
177 |
class headerlessfixup(object): |
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|
178 |
def __init__(self, fh, h): |
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|
179 |
self._h = h |
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|
180 |
self._fh = fh |
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|
181 |
def read(self, n): |
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|
182 |
if self._h: |
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|
183 |
d, self._h = self._h[:n], self._h[n:] |
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|
184 |
if len(d) < n: |
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|
185 |
d += self._fh.read(n - len(d)) |
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|
186 |
return d |
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|
187 |
return self._fh.read(n) |
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|
188 |
|
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|
189 |
def readbundle(fh, fname): |
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|
190 |
header = fh.read(6) |
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|
191 |
|
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|
192 |
if not fname: |
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|
193 |
fname = "stream" |
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|
194 |
if not header.startswith('HG') and header.startswith('\0'): |
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|
195 |
fh = headerlessfixup(fh, header) |
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|
196 |
header = "HG10UN" |
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|
197 |
|
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|
198 |
magic, version, alg = header[0:2], header[2:4], header[4:6] |
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|
199 |
|
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|
200 |
if magic != 'HG': |
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|
201 |
raise util.Abort(_('%s: not a Mercurial bundle') % fname) |
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changeset
|
202 |
if version != '10': |
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|
203 |
raise util.Abort(_('%s: unknown bundle version %s') % (fname, version)) |
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|
204 |
return unbundle10(fh, alg) |