Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/changegroup.py @ 4402:d1dd16256114
Update Windows build instructions.
author | Lee Cantey <lcantey@gmail.com> |
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date | Thu, 03 May 2007 14:09:09 -0700 |
parents | 8c24b6fd5866 |
children | abaee83ce0a6 |
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 from i18n import gettext as _ |
1981
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10 from demandload import * |
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11 demandload(globals(), "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 genchunk(data): |
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37 """build a changegroup chunk""" |
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38 header = struct.pack(">l", len(data)+ 4) |
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39 return "%s%s" % (header, data) |
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40 |
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41 def closechunk(): |
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42 return struct.pack(">l", 0) |
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43 |
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44 class nocompress(object): |
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45 def compress(self, x): |
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46 return x |
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47 def flush(self): |
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48 return "" |
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49 |
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50 bundletypes = { |
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51 "": ("", nocompress), |
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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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57 def writebundle(cg, filename, bundletype): |
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58 """Write a bundle file and return its filename. |
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59 |
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60 Existing files will not be overwritten. |
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61 If no filename is specified, a temporary file is created. |
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62 bz2 compression can be turned off. |
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63 The bundle file will be deleted in case of errors. |
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64 """ |
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65 |
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66 fh = None |
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67 cleanup = None |
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68 try: |
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69 if filename: |
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70 if os.path.exists(filename): |
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71 raise util.Abort(_("file '%s' already exists") % 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 empty = False |
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87 while not empty: |
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88 empty = True |
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89 for chunk in chunkiter(cg): |
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90 empty = False |
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91 fh.write(z.compress(genchunk(chunk))) |
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92 fh.write(z.compress(closechunk())) |
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93 fh.write(z.flush()) |
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94 cleanup = None |
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95 return filename |
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96 finally: |
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97 if fh is not None: |
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98 fh.close() |
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99 if cleanup is not None: |
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100 os.unlink(cleanup) |
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101 |
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102 def readbundle(fh, fname): |
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103 header = fh.read(6) |
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104 if not header.startswith("HG"): |
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105 raise util.Abort(_("%s: not a Mercurial bundle file") % fname) |
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106 elif not header.startswith("HG10"): |
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107 raise util.Abort(_("%s: unknown bundle version") % fname) |
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108 |
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109 if header == "HG10BZ": |
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110 def generator(f): |
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111 zd = bz2.BZ2Decompressor() |
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112 zd.decompress("BZ") |
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113 for chunk in util.filechunkiter(f, 4096): |
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114 yield zd.decompress(chunk) |
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115 return util.chunkbuffer(generator(fh)) |
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116 elif header == "HG10UN": |
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117 return fh |
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118 |
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119 raise util.Abort(_("%s: unknown bundle compression type") |
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120 % fname) |