Mercurial > hg
annotate mercurial/changegroup.py @ 6339:ed9b07a97587
util: check fileno() validity in win32 set_binary()
author | Patrick Mezard <pmezard@gmail.com> |
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date | Fri, 21 Mar 2008 21:56:55 +0100 |
parents | ef1c5a3b653d |
children | 46293a0c7e9f |
rev | line source |
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1981
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1 """ |
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2 changegroup.py - Mercurial changegroup manipulation functions |
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3 |
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4 Copyright 2006 Matt Mackall <mpm@selenic.com> |
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5 |
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6 This software may be used and distributed according to the terms |
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7 of the GNU General Public License, incorporated herein by reference. |
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8 """ |
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9 |
3891 | 10 from i18n import _ |
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11 import struct, os, bz2, zlib, util, tempfile |
1981
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12 |
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13 def getchunk(source): |
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14 """get a chunk from a changegroup""" |
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15 d = source.read(4) |
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16 if not d: |
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17 return "" |
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18 l = struct.unpack(">l", d)[0] |
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19 if l <= 4: |
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20 return "" |
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21 d = source.read(l - 4) |
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22 if len(d) < l - 4: |
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23 raise util.Abort(_("premature EOF reading chunk" |
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24 " (got %d bytes, expected %d)") |
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25 % (len(d), l - 4)) |
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26 return d |
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27 |
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28 def chunkiter(source): |
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29 """iterate through the chunks in source""" |
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30 while 1: |
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31 c = getchunk(source) |
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32 if not c: |
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33 break |
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34 yield c |
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35 |
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36 def chunkheader(length): |
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37 """build a changegroup chunk header""" |
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38 return struct.pack(">l", length + 4) |
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39 |
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40 def closechunk(): |
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41 return struct.pack(">l", 0) |
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42 |
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43 class nocompress(object): |
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44 def compress(self, x): |
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45 return x |
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46 def flush(self): |
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47 return "" |
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48 |
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49 bundletypes = { |
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50 "": ("", nocompress), |
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51 "HG10UN": ("HG10UN", nocompress), |
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52 "HG10BZ": ("HG10", lambda: bz2.BZ2Compressor()), |
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53 "HG10GZ": ("HG10GZ", lambda: zlib.compressobj()), |
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54 } |
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55 |
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56 # hgweb uses this list to communicate it's preferred type |
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57 bundlepriority = ['HG10GZ', 'HG10BZ', 'HG10UN'] |
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58 |
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59 def writebundle(cg, filename, bundletype): |
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60 """Write a bundle file and return its filename. |
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61 |
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62 Existing files will not be overwritten. |
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63 If no filename is specified, a temporary file is created. |
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64 bz2 compression can be turned off. |
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65 The bundle file will be deleted in case of errors. |
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66 """ |
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67 |
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68 fh = None |
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69 cleanup = None |
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70 try: |
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71 if filename: |
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72 fh = open(filename, "wb") |
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73 else: |
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74 fd, filename = tempfile.mkstemp(prefix="hg-bundle-", suffix=".hg") |
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75 fh = os.fdopen(fd, "wb") |
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76 cleanup = filename |
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77 |
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78 header, compressor = bundletypes[bundletype] |
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79 fh.write(header) |
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80 z = compressor() |
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81 |
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82 # parse the changegroup data, otherwise we will block |
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83 # in case of sshrepo because we don't know the end of the stream |
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84 |
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85 # an empty chunkiter is the end of the changegroup |
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86 # a changegroup has at least 2 chunkiters (changelog and manifest). |
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87 # after that, an empty chunkiter is the end of the changegroup |
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88 empty = False |
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89 count = 0 |
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90 while not empty or count <= 2: |
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91 empty = True |
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92 count += 1 |
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93 for chunk in chunkiter(cg): |
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94 empty = False |
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95 fh.write(z.compress(chunkheader(len(chunk)))) |
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96 pos = 0 |
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97 while pos < len(chunk): |
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98 next = pos + 2**20 |
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99 fh.write(z.compress(chunk[pos:next])) |
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100 pos = next |
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101 fh.write(z.compress(closechunk())) |
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102 fh.write(z.flush()) |
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103 cleanup = None |
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104 return filename |
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105 finally: |
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106 if fh is not None: |
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107 fh.close() |
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108 if cleanup is not None: |
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109 os.unlink(cleanup) |
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110 |
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111 def unbundle(header, fh): |
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112 if header == 'HG10UN': |
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113 return fh |
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114 elif not header.startswith('HG'): |
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115 # old client with uncompressed bundle |
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116 def generator(f): |
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117 yield header |
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118 for chunk in f: |
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119 yield chunk |
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120 elif header == 'HG10GZ': |
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121 def generator(f): |
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122 zd = zlib.decompressobj() |
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123 for chunk in f: |
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124 yield zd.decompress(chunk) |
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125 elif header == 'HG10BZ': |
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126 def generator(f): |
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127 zd = bz2.BZ2Decompressor() |
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128 zd.decompress("BZ") |
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129 for chunk in util.filechunkiter(f, 4096): |
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130 yield zd.decompress(chunk) |
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131 return util.chunkbuffer(generator(fh)) |
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132 |
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133 def readbundle(fh, fname): |
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134 header = fh.read(6) |
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135 if not header.startswith('HG'): |
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136 raise util.Abort(_('%s: not a Mercurial bundle file') % fname) |
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137 if not header.startswith('HG10'): |
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138 raise util.Abort(_('%s: unknown bundle version') % fname) |
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139 elif header not in bundletypes: |
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140 raise util.Abort(_('%s: unknown bundle compression type') % fname) |
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141 return unbundle(header, fh) |