Mercurial > hg
annotate tests/test-revlog-raw.py @ 32420:0906b85bf222
demandimport: move to separate package
In Python 3, demand loading is per-package. Keeping demandimport in the
mercurial package would disable demand loading for any modules in
mercurial.
author | Siddharth Agarwal <sid0@fb.com> |
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date | Sun, 21 May 2017 12:10:53 -0700 |
parents | 15707e58fc3d |
children | 6788e648efcf |
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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._isgooddelta = 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 linkmap(lnode): |
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123 return rlog.rev(lnode) |
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124 |
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125 dlog = newrevlog(destname, recreate=True) |
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126 dlog.addgroup(dummychangegroup(), linkmap, tr) |
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127 return dlog |
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128 |
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129 def lowlevelcopy(rlog, tr, destname=b'_destrevlog.i'): |
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130 '''Like addgroupcopy, but use the low level revlog._addrevision directly. |
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131 |
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132 It exercises some code paths that are hard to reach easily otherwise. |
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133 ''' |
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134 dlog = newrevlog(destname, recreate=True) |
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135 for r in rlog: |
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136 p1 = rlog.node(r - 1) |
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137 p2 = node.nullid |
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138 if r == 0: |
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139 text = rlog.revision(r, raw=True) |
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140 cachedelta = None |
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141 else: |
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142 # deltaparent is more interesting if it has the EXTSTORED flag. |
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143 deltaparent = max([0] + [p for p in range(r - 2) if rlog.flags(p)]) |
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144 text = None |
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145 cachedelta = (deltaparent, rlog.revdiff(deltaparent, r)) |
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146 flags = rlog.flags(r) |
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147 ifh = dlog.opener(dlog.indexfile, 'a+') |
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148 dfh = None |
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149 if not dlog._inline: |
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150 dfh = dlog.opener(dlog.datafile, 'a+') |
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151 dlog._addrevision(rlog.node(r), text, tr, r, p1, p2, flags, cachedelta, |
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152 ifh, dfh) |
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153 return dlog |
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154 |
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155 # Utilities to generate revisions for testing |
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156 |
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157 def genbits(n): |
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158 '''Given a number n, generate (2 ** (n * 2) + 1) numbers in range(2 ** n). |
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159 i.e. the generated numbers have a width of n bits. |
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160 |
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161 The combination of two adjacent numbers will cover all possible cases. |
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162 That is to say, given any x, y where both x, and y are in range(2 ** n), |
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163 there is an x followed immediately by y in the generated sequence. |
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164 ''' |
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165 m = 2 ** n |
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166 |
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167 # Gray Code. See https://en.wikipedia.org/wiki/Gray_code |
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168 gray = lambda x: x ^ (x >> 1) |
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169 reversegray = dict((gray(i), i) for i in range(m)) |
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170 |
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171 # Generate (n * 2) bit gray code, yield lower n bits as X, and look for |
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172 # the next unused gray code where higher n bits equal to X. |
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173 |
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174 # For gray codes whose higher bits are X, a[X] of them have been used. |
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175 a = [0] * m |
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176 |
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177 # Iterate from 0. |
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178 x = 0 |
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179 yield x |
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180 for i in range(m * m): |
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181 x = reversegray[x] |
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182 y = gray(a[x] + x * m) & (m - 1) |
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183 assert a[x] < m |
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184 a[x] += 1 |
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185 x = y |
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186 yield x |
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187 |
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188 def gentext(rev): |
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189 '''Given a revision number, generate dummy text''' |
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190 return b''.join(b'%d\n' % j for j in range(-1, rev % 5)) |
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191 |
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192 def writecases(rlog, tr): |
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193 '''Write some revisions interested to the test. |
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194 |
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195 The test is interested in 3 properties of a revision: |
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196 |
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197 - Is it a delta or a full text? (isdelta) |
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198 This is to catch some delta application issues. |
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199 - Does it have a flag of EXTSTORED? (isext) |
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200 This is to catch some flag processor issues. Especially when |
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201 interacted with revlog deltas. |
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202 - Is its text empty? (isempty) |
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203 This is less important. It is intended to try to catch some careless |
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204 checks like "if text" instead of "if text is None". Note: if flag |
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205 processor is involved, raw text may be not empty. |
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206 |
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207 Write 65 revisions. So that all combinations of the above flags for |
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208 adjacent revisions are covered. That is to say, |
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209 |
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210 len(set( |
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211 (r.delta, r.ext, r.empty, (r+1).delta, (r+1).ext, (r+1).empty) |
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212 for r in range(len(rlog) - 1) |
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213 )) is 64. |
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214 |
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215 Where "r.delta", "r.ext", and "r.empty" are booleans matching properties |
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216 mentioned above. |
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217 |
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218 Return expected [(text, rawtext)]. |
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219 ''' |
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220 result = [] |
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221 for i, x in enumerate(genbits(3)): |
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222 isdelta, isext, isempty = bool(x & 1), bool(x & 2), bool(x & 4) |
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223 if isempty: |
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224 text = b'' |
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225 else: |
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226 text = gentext(i) |
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227 rev = appendrev(rlog, text, tr, isext=isext, isdelta=isdelta) |
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228 |
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229 # Verify text, rawtext, and rawsize |
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230 if isext: |
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231 rawtext = writeprocessor(None, text)[0] |
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232 else: |
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233 rawtext = text |
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234 if rlog.rawsize(rev) != len(rawtext): |
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235 abort('rev %d: wrong rawsize' % rev) |
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236 if rlog.revision(rev, raw=False) != text: |
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237 abort('rev %d: wrong text' % rev) |
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238 if rlog.revision(rev, raw=True) != rawtext: |
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239 abort('rev %d: wrong rawtext' % rev) |
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240 result.append((text, rawtext)) |
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241 |
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242 # Verify flags like isdelta, isext work as expected |
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243 if bool(rlog.deltaparent(rev) > -1) != isdelta: |
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244 abort('rev %d: isdelta is ineffective' % rev) |
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245 if bool(rlog.flags(rev)) != isext: |
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246 abort('rev %d: isext is ineffective' % rev) |
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247 return result |
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248 |
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249 # Main test and checking |
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250 |
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251 def checkrevlog(rlog, expected): |
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252 '''Check if revlog has expected contents. expected is [(text, rawtext)]''' |
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253 # Test using different access orders. This could expose some issues |
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254 # depending on revlog caching (see revlog._cache). |
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255 for r0 in range(len(rlog) - 1): |
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256 r1 = r0 + 1 |
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257 for revorder in [[r0, r1], [r1, r0]]: |
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258 for raworder in [[True], [False], [True, False], [False, True]]: |
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259 nlog = newrevlog() |
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260 for rev in revorder: |
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261 for raw in raworder: |
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262 t = nlog.revision(rev, raw=raw) |
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263 if t != expected[rev][int(raw)]: |
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264 abort('rev %d: corrupted %stext' |
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265 % (rev, raw and 'raw' or '')) |
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266 |
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267 def maintest(): |
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268 expected = rl = None |
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269 with newtransaction() as tr: |
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270 rl = newrevlog(recreate=True) |
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271 expected = writecases(rl, tr) |
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272 checkrevlog(rl, expected) |
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273 print('local test passed') |
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274 # Copy via revlog.addgroup |
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275 rl1 = addgroupcopy(rl, tr) |
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276 checkrevlog(rl1, expected) |
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277 rl2 = addgroupcopy(rl, tr, optimaldelta=False) |
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278 checkrevlog(rl2, expected) |
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279 print('addgroupcopy test passed') |
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280 # Copy via revlog.clone |
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281 rl3 = newrevlog(name='_destrevlog3.i', recreate=True) |
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282 rl.clone(tr, rl3) |
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283 checkrevlog(rl3, expected) |
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284 print('clone test passed') |
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285 # Copy via low-level revlog._addrevision |
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286 rl4 = lowlevelcopy(rl, tr) |
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287 checkrevlog(rl4, expected) |
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288 print('lowlevelcopy test passed') |
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289 |
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290 try: |
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291 maintest() |
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292 except Exception as ex: |
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293 abort('crashed: %s' % ex) |