Mercurial > hg
annotate mercurial/changegroup.py @ 8564:6b9ec23b09fc
named branches: improve pre-push logic (issue736)
Each named branch is considered separately, and the push is allowed if
no new branch heads are created for any named branch to be pushed.
Due to some tests's use of --debug, their output will change after this
addition. This has been fixed as well.
Co-contributor: Henrik Stuart <henrik.stuart@edlund.dk>
author | Sune Foldager <cryo@cyanite.org> |
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date | Sat, 23 May 2009 17:04:31 +0200 |
parents | b87a50b7125c |
children | f48454a279b9 |
rev | line source |
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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 |
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6 # GNU General Public License version 2, incorporated herein by reference. |
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7 |
3891 | 8 from i18n import _ |
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9 import util |
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10 import struct, os, bz2, zlib, tempfile |
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11 |
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12 def getchunk(source): |
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13 """get a chunk from a changegroup""" |
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14 d = source.read(4) |
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15 if not d: |
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16 return "" |
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17 l = struct.unpack(">l", d)[0] |
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18 if l <= 4: |
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19 return "" |
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20 d = source.read(l - 4) |
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21 if len(d) < l - 4: |
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22 raise util.Abort(_("premature EOF reading chunk" |
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23 " (got %d bytes, expected %d)") |
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24 % (len(d), l - 4)) |
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25 return d |
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26 |
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27 def chunkiter(source): |
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28 """iterate through the chunks in source""" |
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29 while 1: |
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30 c = getchunk(source) |
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31 if not c: |
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32 break |
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33 yield c |
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34 |
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35 def chunkheader(length): |
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36 """build a changegroup chunk header""" |
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37 return struct.pack(">l", length + 4) |
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38 |
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39 def closechunk(): |
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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), |
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50 "HG10UN": ("HG10UN", nocompress), |
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51 "HG10BZ": ("HG10", lambda: bz2.BZ2Compressor()), |
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52 "HG10GZ": ("HG10GZ", lambda: zlib.compressobj()), |
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53 } |
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54 |
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55 # hgweb uses this list to communicate it's preferred type |
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56 bundlepriority = ['HG10GZ', 'HG10BZ', 'HG10UN'] |
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57 |
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58 def writebundle(cg, filename, bundletype): |
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59 """Write a bundle file and return its filename. |
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60 |
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61 Existing files will not be overwritten. |
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62 If no filename is specified, a temporary file is created. |
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63 bz2 compression can be turned off. |
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64 The bundle file will be deleted in case of errors. |
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65 """ |
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66 |
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67 fh = None |
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68 cleanup = None |
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69 try: |
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70 if filename: |
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71 fh = open(filename, "wb") |
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72 else: |
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73 fd, filename = tempfile.mkstemp(prefix="hg-bundle-", suffix=".hg") |
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74 fh = os.fdopen(fd, "wb") |
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75 cleanup = filename |
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76 |
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77 header, compressor = bundletypes[bundletype] |
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78 fh.write(header) |
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79 z = compressor() |
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80 |
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81 # parse the changegroup data, otherwise we will block |
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82 # in case of sshrepo because we don't know the end of the stream |
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83 |
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84 # an empty chunkiter is the end of the changegroup |
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85 # a changegroup has at least 2 chunkiters (changelog and manifest). |
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86 # after that, an empty chunkiter is the end of the changegroup |
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87 empty = False |
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88 count = 0 |
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89 while not empty or count <= 2: |
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90 empty = True |
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91 count += 1 |
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92 for chunk in chunkiter(cg): |
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93 empty = False |
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94 fh.write(z.compress(chunkheader(len(chunk)))) |
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95 pos = 0 |
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96 while pos < len(chunk): |
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97 next = pos + 2**20 |
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98 fh.write(z.compress(chunk[pos:next])) |
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99 pos = next |
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100 fh.write(z.compress(closechunk())) |
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101 fh.write(z.flush()) |
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102 cleanup = None |
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103 return filename |
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104 finally: |
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105 if fh is not None: |
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106 fh.close() |
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107 if cleanup is not None: |
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108 os.unlink(cleanup) |
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109 |
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110 def unbundle(header, fh): |
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111 if header == 'HG10UN': |
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112 return fh |
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113 elif not header.startswith('HG'): |
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114 # old client with uncompressed bundle |
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115 def generator(f): |
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116 yield header |
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117 for chunk in f: |
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118 yield chunk |
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119 elif header == 'HG10GZ': |
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120 def generator(f): |
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121 zd = zlib.decompressobj() |
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122 for chunk in f: |
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123 yield zd.decompress(chunk) |
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124 elif header == 'HG10BZ': |
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125 def generator(f): |
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126 zd = bz2.BZ2Decompressor() |
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127 zd.decompress("BZ") |
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128 for chunk in util.filechunkiter(f, 4096): |
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129 yield zd.decompress(chunk) |
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130 return util.chunkbuffer(generator(fh)) |
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131 |
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132 def readbundle(fh, fname): |
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133 header = fh.read(6) |
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134 if not header.startswith('HG'): |
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135 raise util.Abort(_('%s: not a Mercurial bundle file') % fname) |
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136 if not header.startswith('HG10'): |
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137 raise util.Abort(_('%s: unknown bundle version') % fname) |
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138 elif header not in bundletypes: |
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139 raise util.Abort(_('%s: unknown bundle compression type') % fname) |
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140 return unbundle(header, fh) |