Mercurial > hg
annotate mercurial/filelog.py @ 32129:f0ea0f642627
py3: make posix.getuser return a bytes
author | Pulkit Goyal <7895pulkit@gmail.com> |
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date | Fri, 21 Apr 2017 00:53:38 +0530 |
parents | 8ac7ac714e92 |
children | ba479850c9c7 |
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1089 | 1 # filelog.py - file history class for mercurial |
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2 # |
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3 # Copyright 2005-2007 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 |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import re |
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11 import struct |
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12 |
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13 from . import ( |
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14 error, |
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15 mdiff, |
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16 revlog, |
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17 ) |
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18 |
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19 _mdre = re.compile('\1\n') |
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20 def parsemeta(text): |
32124 | 21 """return (metadatadict, metadatasize)""" |
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22 # text can be buffer, so we can't use .startswith or .index |
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23 if text[:2] != '\1\n': |
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24 return None, None |
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25 s = _mdre.search(text, 2).start() |
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26 mtext = text[2:s] |
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27 meta = {} |
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28 for l in mtext.splitlines(): |
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29 k, v = l.split(": ", 1) |
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30 meta[k] = v |
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31 return meta, (s + 2) |
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32 |
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33 def packmeta(meta, text): |
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34 keys = sorted(meta.iterkeys()) |
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35 metatext = "".join("%s: %s\n" % (k, meta[k]) for k in keys) |
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36 return "\1\n%s\1\n%s" % (metatext, text) |
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37 |
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38 def _censoredtext(text): |
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39 m, offs = parsemeta(text) |
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40 return m and "censored" in m |
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41 |
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42 class filelog(revlog.revlog): |
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43 def __init__(self, opener, path): |
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44 super(filelog, self).__init__(opener, |
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45 "/".join(("data", path + ".i"))) |
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46 |
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47 def read(self, node): |
360 | 48 t = self.revision(node) |
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49 if not t.startswith('\1\n'): |
360 | 50 return t |
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51 s = t.index('\1\n', 2) |
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52 return t[s + 2:] |
360 | 53 |
54 def add(self, text, meta, transaction, link, p1=None, p2=None): | |
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55 if meta or text.startswith('\1\n'): |
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56 text = packmeta(meta, text) |
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57 return self.addrevision(text, transaction, link, p1, p2) |
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58 |
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60 if self.parents(node)[0] != revlog.nullid: |
1116 | 61 return False |
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62 t = self.revision(node) |
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63 m = parsemeta(t)[0] |
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64 if m and "copy" in m: |
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65 return (m["copy"], revlog.bin(m["copyrev"])) |
1116 | 66 return False |
67 | |
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68 def size(self, rev): |
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69 """return the size of a given revision""" |
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70 |
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71 # for revisions with renames, we have to go the slow way |
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72 node = self.node(rev) |
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73 if self.renamed(node): |
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74 return len(self.read(node)) |
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75 if self.iscensored(rev): |
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76 return 0 |
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77 |
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78 # XXX if self.read(node).startswith("\1\n"), this returns (size+4) |
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79 return super(filelog, self).size(rev) |
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80 |
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81 def cmp(self, node, text): |
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82 """compare text with a given file revision |
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83 |
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84 returns True if text is different than what is stored. |
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85 """ |
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86 |
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87 t = text |
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88 if text.startswith('\1\n'): |
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89 t = '\1\n\1\n' + text |
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90 |
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91 samehashes = not super(filelog, self).cmp(node, t) |
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92 if samehashes: |
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93 return False |
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94 |
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95 # censored files compare against the empty file |
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96 if self.iscensored(self.rev(node)): |
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97 return text != '' |
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98 |
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99 # renaming a file produces a different hash, even if the data |
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100 # remains unchanged. Check if it's the case (slow): |
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101 if self.renamed(node): |
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102 t2 = self.read(node) |
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103 return t2 != text |
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104 |
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105 return True |
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106 |
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107 def checkhash(self, text, node, p1=None, p2=None, rev=None): |
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108 try: |
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109 super(filelog, self).checkhash(text, node, p1=p1, p2=p2, rev=rev) |
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110 except error.RevlogError: |
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111 if _censoredtext(text): |
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112 raise error.CensoredNodeError(self.indexfile, node, text) |
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113 raise |
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114 |
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115 def iscensored(self, rev): |
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116 """Check if a file revision is censored.""" |
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117 return self.flags(rev) & revlog.REVIDX_ISCENSORED |
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118 |
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119 def _peek_iscensored(self, baserev, delta, flush): |
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120 """Quickly check if a delta produces a censored revision.""" |
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121 # Fragile heuristic: unless new file meta keys are added alphabetically |
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122 # preceding "censored", all censored revisions are prefixed by |
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123 # "\1\ncensored:". A delta producing such a censored revision must be a |
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124 # full-replacement delta, so we inspect the first and only patch in the |
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125 # delta for this prefix. |
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126 hlen = struct.calcsize(">lll") |
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127 if len(delta) <= hlen: |
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128 return False |
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129 |
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130 oldlen = self.rawsize(baserev) |
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131 newlen = len(delta) - hlen |
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132 if delta[:hlen] != mdiff.replacediffheader(oldlen, newlen): |
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133 return False |
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134 |
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135 add = "\1\ncensored:" |
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136 addlen = len(add) |
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137 return newlen >= addlen and delta[hlen:hlen + addlen] == add |