Mercurial > hg
annotate mercurial/changegroup.py @ 9815:49efeed49c94
rebase: make sure the newancestor is used during the whole update
(issue1561)
Before this change, newancestor was used only once as a replacement
for ancestor.ancestor, but merge.update calls ancestor.ancestor
several times, so it ends up with the "wrong" ancestor (the real
ancestor, but we want the parent of the rebased changeset for all but
the first rebased changeset).
Added a new test case for this: test-rebase-newancestor.
Also, in one scenario in test-rebase-collapse, there was a spurious
conflict caused by the same issue, so that test case was fixed by
removing the now unneeded conflict resolution and the output was
adapted accordingly.
author | Christian Boos <cboos@bct-technology.com> |
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date | Mon, 09 Nov 2009 20:15:49 +0100 |
parents | 1c4e4004f3a6 |
children | 25e572394f5c |
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 """return the next chunk from changegroup 'source' as a string""" |
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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, yielding a sequence of chunks |
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29 (strings)""" |
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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 """return a changegroup chunk header (string)""" |
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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 a changegroup chunk header (string) for a zero-length chunk""" |
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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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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 chunkiter is the end of the changegroup |
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87 # a changegroup has at least 2 chunkiters (changelog and manifest). |
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88 # after that, an empty chunkiter 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 for chunk in chunkiter(cg): |
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95 empty = False |
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96 fh.write(z.compress(chunkheader(len(chunk)))) |
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97 pos = 0 |
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98 while pos < len(chunk): |
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99 next = pos + 2**20 |
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100 fh.write(z.compress(chunk[pos:next])) |
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101 pos = next |
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102 fh.write(z.compress(closechunk())) |
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103 fh.write(z.flush()) |
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104 cleanup = None |
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105 return filename |
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106 finally: |
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107 if fh is not None: |
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108 fh.close() |
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109 if cleanup is not None: |
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110 os.unlink(cleanup) |
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111 |
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112 def unbundle(header, fh): |
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113 if header == 'HG10UN': |
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114 return fh |
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115 elif not header.startswith('HG'): |
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116 # old client with uncompressed bundle |
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117 def generator(f): |
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118 yield header |
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119 for chunk in f: |
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120 yield chunk |
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121 elif header == 'HG10GZ': |
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122 def generator(f): |
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123 zd = zlib.decompressobj() |
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124 for chunk in f: |
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125 yield zd.decompress(chunk) |
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126 elif header == 'HG10BZ': |
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127 def generator(f): |
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128 zd = bz2.BZ2Decompressor() |
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129 zd.decompress("BZ") |
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130 for chunk in util.filechunkiter(f, 4096): |
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131 yield zd.decompress(chunk) |
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132 return util.chunkbuffer(generator(fh)) |
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133 |
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134 def readbundle(fh, fname): |
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135 header = fh.read(6) |
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136 if not header.startswith('HG'): |
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137 raise util.Abort(_('%s: not a Mercurial bundle file') % fname) |
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138 if not header.startswith('HG10'): |
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139 raise util.Abort(_('%s: unknown bundle version') % fname) |
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140 elif header not in bundletypes: |
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141 raise util.Abort(_('%s: unknown bundle compression type') % fname) |
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142 return unbundle(header, fh) |