annotate tests/test-revlog-raw.py @ 36681:340e4b711df7

bdiff: avoid pointer arithmetic on void* MSVC 2008 complains: mercurial/cext/bdiff.c(106) : error C2036: 'void *' : unknown size mercurial/cext/bdiff.c(107) : error C2036: 'void *' : unknown size Maybe it's a gcc extension? https://stackoverflow.com/questions/37460579/error-c2036-void-unknown-size
author Matt Harbison <matt_harbison@yahoo.com>
date Sat, 03 Mar 2018 23:29:40 -0500
parents edc9330acac1
children 33275ab5e837
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # test revlog interaction about raw data (flagprocessor)
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2
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3 from __future__ import absolute_import, print_function
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4
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5 import sys
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6
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7 from mercurial import (
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8 encoding,
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9 node,
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10 revlog,
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11 transaction,
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12 vfs,
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13 )
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14
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15 # TESTTMP is optional. This makes it convenient to run without run-tests.py
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16 tvfs = vfs.vfs(encoding.environ.get('TESTTMP', b'/tmp'))
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17
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18 # Enable generaldelta otherwise revlog won't use delta as expected by the test
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19 tvfs.options = {'generaldelta': True, 'revlogv1': True}
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20
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21 # The test wants to control whether to use delta explicitly, based on
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22 # "storedeltachains".
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23 revlog.revlog._isgooddeltainfo = lambda self, d, textlen: self.storedeltachains
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24
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25 def abort(msg):
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26 print('abort: %s' % msg)
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27 # Return 0 so run-tests.py could compare the output.
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28 sys.exit()
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29
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30 # Register a revlog processor for flag EXTSTORED.
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31 #
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32 # It simply prepends a fixed header, and replaces '1' to 'i'. So it has
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33 # insertion and replacement, and may be interesting to test revlog's line-based
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34 # deltas.
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35 _extheader = b'E\n'
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36
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37 def readprocessor(self, rawtext):
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38 # True: the returned text could be used to verify hash
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39 text = rawtext[len(_extheader):].replace(b'i', b'1')
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40 return text, True
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41
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42 def writeprocessor(self, text):
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43 # False: the returned rawtext shouldn't be used to verify hash
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44 rawtext = _extheader + text.replace(b'1', b'i')
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45 return rawtext, False
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46
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47 def rawprocessor(self, rawtext):
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48 # False: do not verify hash. Only the content returned by "readprocessor"
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49 # can be used to verify hash.
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50 return False
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51
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52 revlog.addflagprocessor(revlog.REVIDX_EXTSTORED,
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53 (readprocessor, writeprocessor, rawprocessor))
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54
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55 # Utilities about reading and appending revlog
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56
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57 def newtransaction():
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58 # A transaction is required to write revlogs
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59 report = lambda msg: None
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60 return transaction.transaction(report, tvfs, {'plain': tvfs}, b'journal')
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61
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62 def newrevlog(name=b'_testrevlog.i', recreate=False):
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63 if recreate:
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64 tvfs.tryunlink(name)
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65 rlog = revlog.revlog(tvfs, name)
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66 return rlog
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67
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68 def appendrev(rlog, text, tr, isext=False, isdelta=True):
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69 '''Append a revision. If isext is True, set the EXTSTORED flag so flag
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70 processor will be used (and rawtext is different from text). If isdelta is
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71 True, force the revision to be a delta, otherwise it's full text.
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72 '''
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73 nextrev = len(rlog)
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74 p1 = rlog.node(nextrev - 1)
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75 p2 = node.nullid
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76 if isext:
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77 flags = revlog.REVIDX_EXTSTORED
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78 else:
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79 flags = revlog.REVIDX_DEFAULT_FLAGS
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80 # Change storedeltachains temporarily, to override revlog's delta decision
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81 rlog.storedeltachains = isdelta
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82 try:
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83 rlog.addrevision(text, tr, nextrev, p1, p2, flags=flags)
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84 return nextrev
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85 except Exception as ex:
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86 abort('rev %d: failed to append: %s' % (nextrev, ex))
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87 finally:
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88 # Restore storedeltachains. It is always True, see revlog.__init__
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89 rlog.storedeltachains = True
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90
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91 def addgroupcopy(rlog, tr, destname=b'_destrevlog.i', optimaldelta=True):
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92 '''Copy revlog to destname using revlog.addgroup. Return the copied revlog.
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93
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94 This emulates push or pull. They use changegroup. Changegroup requires
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95 repo to work. We don't have a repo, so a dummy changegroup is used.
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96
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97 If optimaldelta is True, use optimized delta parent, so the destination
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98 revlog could probably reuse it. Otherwise it builds sub-optimal delta, and
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99 the destination revlog needs more work to use it.
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100
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101 This exercises some revlog.addgroup (and revlog._addrevision(text=None))
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102 code path, which is not covered by "appendrev" alone.
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103 '''
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104 class dummychangegroup(object):
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105 @staticmethod
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106 def deltachunk(pnode):
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107 pnode = pnode or node.nullid
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108 parentrev = rlog.rev(pnode)
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109 r = parentrev + 1
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110 if r >= len(rlog):
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111 return {}
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112 if optimaldelta:
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113 deltaparent = parentrev
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114 else:
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115 # suboptimal deltaparent
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116 deltaparent = min(0, parentrev)
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117 return {'node': rlog.node(r), 'p1': pnode, 'p2': node.nullid,
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118 'cs': rlog.node(rlog.linkrev(r)), 'flags': rlog.flags(r),
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119 'deltabase': rlog.node(deltaparent),
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120 'delta': rlog.revdiff(deltaparent, r)}
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121
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122 def deltaiter(self):
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123 chain = None
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124 for chunkdata in iter(lambda: self.deltachunk(chain), {}):
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125 node = chunkdata['node']
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126 p1 = chunkdata['p1']
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127 p2 = chunkdata['p2']
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128 cs = chunkdata['cs']
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129 deltabase = chunkdata['deltabase']
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130 delta = chunkdata['delta']
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131 flags = chunkdata['flags']
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132
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133 chain = node
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134
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135 yield (node, p1, p2, cs, deltabase, delta, flags)
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136
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137 def linkmap(lnode):
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138 return rlog.rev(lnode)
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139
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140 dlog = newrevlog(destname, recreate=True)
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141 dummydeltas = dummychangegroup().deltaiter()
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142 dlog.addgroup(dummydeltas, linkmap, tr)
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143 return dlog
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144
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145 def lowlevelcopy(rlog, tr, destname=b'_destrevlog.i'):
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146 '''Like addgroupcopy, but use the low level revlog._addrevision directly.
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147
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148 It exercises some code paths that are hard to reach easily otherwise.
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149 '''
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150 dlog = newrevlog(destname, recreate=True)
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151 for r in rlog:
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152 p1 = rlog.node(r - 1)
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153 p2 = node.nullid
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154 if r == 0:
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155 text = rlog.revision(r, raw=True)
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156 cachedelta = None
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157 else:
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158 # deltaparent is more interesting if it has the EXTSTORED flag.
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159 deltaparent = max([0] + [p for p in range(r - 2) if rlog.flags(p)])
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160 text = None
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161 cachedelta = (deltaparent, rlog.revdiff(deltaparent, r))
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162 flags = rlog.flags(r)
33625
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163 ifh = dfh = None
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164 try:
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165 ifh = dlog.opener(dlog.indexfile, 'a+')
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166 if not dlog._inline:
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167 dfh = dlog.opener(dlog.datafile, 'a+')
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168 dlog._addrevision(rlog.node(r), text, tr, r, p1, p2, flags,
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169 cachedelta, ifh, dfh)
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170 finally:
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171 if dfh is not None:
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172 dfh.close()
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173 if ifh is not None:
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174 ifh.close()
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175 return dlog
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176
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177 # Utilities to generate revisions for testing
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178
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179 def genbits(n):
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180 '''Given a number n, generate (2 ** (n * 2) + 1) numbers in range(2 ** n).
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181 i.e. the generated numbers have a width of n bits.
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182
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183 The combination of two adjacent numbers will cover all possible cases.
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184 That is to say, given any x, y where both x, and y are in range(2 ** n),
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185 there is an x followed immediately by y in the generated sequence.
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186 '''
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187 m = 2 ** n
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188
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189 # Gray Code. See https://en.wikipedia.org/wiki/Gray_code
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190 gray = lambda x: x ^ (x >> 1)
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191 reversegray = dict((gray(i), i) for i in range(m))
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192
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193 # Generate (n * 2) bit gray code, yield lower n bits as X, and look for
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194 # the next unused gray code where higher n bits equal to X.
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195
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196 # For gray codes whose higher bits are X, a[X] of them have been used.
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197 a = [0] * m
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198
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199 # Iterate from 0.
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200 x = 0
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201 yield x
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202 for i in range(m * m):
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203 x = reversegray[x]
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204 y = gray(a[x] + x * m) & (m - 1)
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205 assert a[x] < m
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206 a[x] += 1
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207 x = y
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208 yield x
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209
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210 def gentext(rev):
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211 '''Given a revision number, generate dummy text'''
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212 return b''.join(b'%d\n' % j for j in range(-1, rev % 5))
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213
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214 def writecases(rlog, tr):
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215 '''Write some revisions interested to the test.
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216
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217 The test is interested in 3 properties of a revision:
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218
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219 - Is it a delta or a full text? (isdelta)
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220 This is to catch some delta application issues.
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221 - Does it have a flag of EXTSTORED? (isext)
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222 This is to catch some flag processor issues. Especially when
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223 interacted with revlog deltas.
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224 - Is its text empty? (isempty)
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225 This is less important. It is intended to try to catch some careless
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226 checks like "if text" instead of "if text is None". Note: if flag
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227 processor is involved, raw text may be not empty.
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228
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229 Write 65 revisions. So that all combinations of the above flags for
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230 adjacent revisions are covered. That is to say,
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231
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232 len(set(
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233 (r.delta, r.ext, r.empty, (r+1).delta, (r+1).ext, (r+1).empty)
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234 for r in range(len(rlog) - 1)
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235 )) is 64.
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236
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237 Where "r.delta", "r.ext", and "r.empty" are booleans matching properties
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238 mentioned above.
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239
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240 Return expected [(text, rawtext)].
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241 '''
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242 result = []
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243 for i, x in enumerate(genbits(3)):
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244 isdelta, isext, isempty = bool(x & 1), bool(x & 2), bool(x & 4)
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245 if isempty:
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246 text = b''
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247 else:
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248 text = gentext(i)
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249 rev = appendrev(rlog, text, tr, isext=isext, isdelta=isdelta)
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250
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251 # Verify text, rawtext, and rawsize
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252 if isext:
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253 rawtext = writeprocessor(None, text)[0]
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254 else:
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255 rawtext = text
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256 if rlog.rawsize(rev) != len(rawtext):
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257 abort('rev %d: wrong rawsize' % rev)
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258 if rlog.revision(rev, raw=False) != text:
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259 abort('rev %d: wrong text' % rev)
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260 if rlog.revision(rev, raw=True) != rawtext:
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261 abort('rev %d: wrong rawtext' % rev)
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262 result.append((text, rawtext))
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263
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264 # Verify flags like isdelta, isext work as expected
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265 if bool(rlog.deltaparent(rev) > -1) != isdelta:
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266 abort('rev %d: isdelta is ineffective' % rev)
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267 if bool(rlog.flags(rev)) != isext:
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268 abort('rev %d: isext is ineffective' % rev)
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269 return result
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270
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271 # Main test and checking
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272
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273 def checkrevlog(rlog, expected):
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274 '''Check if revlog has expected contents. expected is [(text, rawtext)]'''
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275 # Test using different access orders. This could expose some issues
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276 # depending on revlog caching (see revlog._cache).
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277 for r0 in range(len(rlog) - 1):
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278 r1 = r0 + 1
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279 for revorder in [[r0, r1], [r1, r0]]:
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280 for raworder in [[True], [False], [True, False], [False, True]]:
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281 nlog = newrevlog()
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282 for rev in revorder:
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283 for raw in raworder:
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284 t = nlog.revision(rev, raw=raw)
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285 if t != expected[rev][int(raw)]:
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286 abort('rev %d: corrupted %stext'
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287 % (rev, raw and 'raw' or ''))
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288
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289 def maintest():
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290 expected = rl = None
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291 with newtransaction() as tr:
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292 rl = newrevlog(recreate=True)
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293 expected = writecases(rl, tr)
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294 checkrevlog(rl, expected)
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295 print('local test passed')
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296 # Copy via revlog.addgroup
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parents:
diff changeset
297 rl1 = addgroupcopy(rl, tr)
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Jun Wu <quark@fb.com>
parents:
diff changeset
298 checkrevlog(rl1, expected)
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parents:
diff changeset
299 rl2 = addgroupcopy(rl, tr, optimaldelta=False)
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parents:
diff changeset
300 checkrevlog(rl2, expected)
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parents:
diff changeset
301 print('addgroupcopy test passed')
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Jun Wu <quark@fb.com>
parents:
diff changeset
302 # Copy via revlog.clone
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parents:
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303 rl3 = newrevlog(name='_destrevlog3.i', recreate=True)
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parents:
diff changeset
304 rl.clone(tr, rl3)
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Jun Wu <quark@fb.com>
parents:
diff changeset
305 checkrevlog(rl3, expected)
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Jun Wu <quark@fb.com>
parents:
diff changeset
306 print('clone test passed')
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Jun Wu <quark@fb.com>
parents:
diff changeset
307 # Copy via low-level revlog._addrevision
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Jun Wu <quark@fb.com>
parents:
diff changeset
308 rl4 = lowlevelcopy(rl, tr)
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Jun Wu <quark@fb.com>
parents:
diff changeset
309 checkrevlog(rl4, expected)
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Jun Wu <quark@fb.com>
parents:
diff changeset
310 print('lowlevelcopy test passed')
985de02b5b9d revlog: add a stronger test for raw processing
Jun Wu <quark@fb.com>
parents:
diff changeset
311
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Jun Wu <quark@fb.com>
parents:
diff changeset
312 try:
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Jun Wu <quark@fb.com>
parents:
diff changeset
313 maintest()
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Jun Wu <quark@fb.com>
parents:
diff changeset
314 except Exception as ex:
985de02b5b9d revlog: add a stronger test for raw processing
Jun Wu <quark@fb.com>
parents:
diff changeset
315 abort('crashed: %s' % ex)