Mercurial > hg
annotate tests/test-revlog-raw.py @ 46924:ca0049946e9a
split: avoid strip if split is a no-op (identical to original)
Differential Revision: https://phab.mercurial-scm.org/D10389
author | Kyle Lippincott <spectral@google.com> |
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date | Mon, 12 Apr 2021 19:25:34 -0700 |
parents | a41565bef69f |
children | d55b71393907 |
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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 collections |
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6 import hashlib |
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7 import sys |
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8 |
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9 from mercurial.node import nullid |
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10 from mercurial import ( |
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11 encoding, |
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12 revlog, |
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13 transaction, |
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14 vfs, |
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15 ) |
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16 |
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17 from mercurial.revlogutils import ( |
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18 deltas, |
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19 flagutil, |
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20 ) |
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21 |
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22 # TESTTMP is optional. This makes it convenient to run without run-tests.py |
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23 tvfs = vfs.vfs(encoding.environ.get(b'TESTTMP', b'/tmp')) |
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24 |
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25 # Enable generaldelta otherwise revlog won't use delta as expected by the test |
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26 tvfs.options = { |
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27 b'generaldelta': True, |
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28 b'revlogv1': True, |
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29 b'sparse-revlog': True, |
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30 } |
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31 |
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32 # The test wants to control whether to use delta explicitly, based on |
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33 # "storedeltachains". |
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34 revlog.revlog._isgooddeltainfo = lambda self, d, textlen: self._storedeltachains |
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35 |
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36 |
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37 def abort(msg): |
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38 print('abort: %s' % msg) |
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39 # Return 0 so run-tests.py could compare the output. |
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40 sys.exit() |
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41 |
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42 |
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43 # Register a revlog processor for flag EXTSTORED. |
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44 # |
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45 # It simply prepends a fixed header, and replaces '1' to 'i'. So it has |
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46 # insertion and replacement, and may be interesting to test revlog's line-based |
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47 # deltas. |
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48 _extheader = b'E\n' |
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49 |
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50 |
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51 def readprocessor(self, rawtext): |
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52 # True: the returned text could be used to verify hash |
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53 text = rawtext[len(_extheader) :].replace(b'i', b'1') |
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54 return text, True |
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55 |
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56 |
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57 def writeprocessor(self, text): |
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58 # False: the returned rawtext shouldn't be used to verify hash |
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59 rawtext = _extheader + text.replace(b'1', b'i') |
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60 return rawtext, False |
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61 |
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62 |
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63 def rawprocessor(self, rawtext): |
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64 # False: do not verify hash. Only the content returned by "readprocessor" |
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65 # can be used to verify hash. |
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66 return False |
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67 |
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68 |
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69 flagutil.addflagprocessor( |
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70 revlog.REVIDX_EXTSTORED, (readprocessor, writeprocessor, rawprocessor) |
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71 ) |
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72 |
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73 # Utilities about reading and appending revlog |
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74 |
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75 |
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76 def newtransaction(): |
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77 # A transaction is required to write revlogs |
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78 report = lambda msg: None |
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79 return transaction.transaction(report, tvfs, {'plain': tvfs}, b'journal') |
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80 |
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81 |
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82 def newrevlog(name=b'_testrevlog.i', recreate=False): |
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83 if recreate: |
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84 tvfs.tryunlink(name) |
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85 rlog = revlog.revlog(tvfs, name) |
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86 return rlog |
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87 |
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88 |
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89 def appendrev(rlog, text, tr, isext=False, isdelta=True): |
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90 """Append a revision. If isext is True, set the EXTSTORED flag so flag |
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91 processor will be used (and rawtext is different from text). If isdelta is |
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92 True, force the revision to be a delta, otherwise it's full text. |
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93 """ |
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94 nextrev = len(rlog) |
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95 p1 = rlog.node(nextrev - 1) |
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96 p2 = nullid |
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97 if isext: |
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98 flags = revlog.REVIDX_EXTSTORED |
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99 else: |
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100 flags = revlog.REVIDX_DEFAULT_FLAGS |
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101 # Change storedeltachains temporarily, to override revlog's delta decision |
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102 rlog._storedeltachains = isdelta |
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103 try: |
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104 rlog.addrevision(text, tr, nextrev, p1, p2, flags=flags) |
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105 return nextrev |
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106 except Exception as ex: |
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107 abort('rev %d: failed to append: %s' % (nextrev, ex)) |
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108 finally: |
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109 # Restore storedeltachains. It is always True, see revlog.__init__ |
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110 rlog._storedeltachains = True |
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111 |
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112 |
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113 def addgroupcopy(rlog, tr, destname=b'_destrevlog.i', optimaldelta=True): |
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114 """Copy revlog to destname using revlog.addgroup. Return the copied revlog. |
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115 |
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116 This emulates push or pull. They use changegroup. Changegroup requires |
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117 repo to work. We don't have a repo, so a dummy changegroup is used. |
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118 |
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119 If optimaldelta is True, use optimized delta parent, so the destination |
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120 revlog could probably reuse it. Otherwise it builds sub-optimal delta, and |
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121 the destination revlog needs more work to use it. |
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122 |
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123 This exercises some revlog.addgroup (and revlog._addrevision(text=None)) |
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124 code path, which is not covered by "appendrev" alone. |
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125 """ |
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126 |
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127 class dummychangegroup(object): |
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128 @staticmethod |
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129 def deltachunk(pnode): |
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130 pnode = pnode or nullid |
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131 parentrev = rlog.rev(pnode) |
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132 r = parentrev + 1 |
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133 if r >= len(rlog): |
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134 return {} |
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135 if optimaldelta: |
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136 deltaparent = parentrev |
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137 else: |
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138 # suboptimal deltaparent |
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139 deltaparent = min(0, parentrev) |
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140 if not rlog.candelta(deltaparent, r): |
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141 deltaparent = -1 |
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142 return { |
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143 b'node': rlog.node(r), |
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144 b'p1': pnode, |
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145 b'p2': nullid, |
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146 b'cs': rlog.node(rlog.linkrev(r)), |
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147 b'flags': rlog.flags(r), |
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148 b'deltabase': rlog.node(deltaparent), |
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149 b'delta': rlog.revdiff(deltaparent, r), |
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150 b'sidedata': rlog.sidedata(r), |
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151 } |
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152 |
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153 def deltaiter(self): |
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154 chain = None |
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155 for chunkdata in iter(lambda: self.deltachunk(chain), {}): |
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156 node = chunkdata[b'node'] |
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157 p1 = chunkdata[b'p1'] |
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158 p2 = chunkdata[b'p2'] |
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159 cs = chunkdata[b'cs'] |
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160 deltabase = chunkdata[b'deltabase'] |
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161 delta = chunkdata[b'delta'] |
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162 flags = chunkdata[b'flags'] |
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163 sidedata = chunkdata[b'sidedata'] |
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164 |
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165 chain = node |
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166 |
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167 yield (node, p1, p2, cs, deltabase, delta, flags, sidedata) |
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168 |
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169 def linkmap(lnode): |
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170 return rlog.rev(lnode) |
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171 |
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172 dlog = newrevlog(destname, recreate=True) |
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173 dummydeltas = dummychangegroup().deltaiter() |
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174 dlog.addgroup(dummydeltas, linkmap, tr) |
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175 return dlog |
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176 |
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177 |
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178 def lowlevelcopy(rlog, tr, destname=b'_destrevlog.i'): |
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179 """Like addgroupcopy, but use the low level revlog._addrevision directly. |
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180 |
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181 It exercises some code paths that are hard to reach easily otherwise. |
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182 """ |
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183 dlog = newrevlog(destname, recreate=True) |
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184 for r in rlog: |
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185 p1 = rlog.node(r - 1) |
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186 p2 = nullid |
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187 if r == 0 or (rlog.flags(r) & revlog.REVIDX_EXTSTORED): |
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188 text = rlog.rawdata(r) |
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189 cachedelta = None |
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190 else: |
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191 # deltaparent cannot have EXTSTORED flag. |
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192 deltaparent = max( |
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193 [-1] |
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194 + [ |
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195 p |
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196 for p in range(r) |
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197 if rlog.flags(p) & revlog.REVIDX_EXTSTORED == 0 |
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198 ] |
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199 ) |
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200 text = None |
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201 cachedelta = (deltaparent, rlog.revdiff(deltaparent, r)) |
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202 flags = rlog.flags(r) |
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203 ifh = dfh = None |
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204 try: |
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205 ifh = dlog.opener(dlog.indexfile, b'a+') |
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206 if not dlog._inline: |
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207 dfh = dlog.opener(dlog.datafile, b'a+') |
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208 dlog._addrevision( |
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209 rlog.node(r), text, tr, r, p1, p2, flags, cachedelta, ifh, dfh |
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210 ) |
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211 finally: |
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212 if dfh is not None: |
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213 dfh.close() |
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214 if ifh is not None: |
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215 ifh.close() |
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216 return dlog |
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217 |
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218 |
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219 # Utilities to generate revisions for testing |
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220 |
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221 |
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222 def genbits(n): |
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223 """Given a number n, generate (2 ** (n * 2) + 1) numbers in range(2 ** n). |
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224 i.e. the generated numbers have a width of n bits. |
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225 |
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226 The combination of two adjacent numbers will cover all possible cases. |
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227 That is to say, given any x, y where both x, and y are in range(2 ** n), |
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228 there is an x followed immediately by y in the generated sequence. |
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229 """ |
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230 m = 2 ** n |
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231 |
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232 # Gray Code. See https://en.wikipedia.org/wiki/Gray_code |
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233 gray = lambda x: x ^ (x >> 1) |
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234 reversegray = {gray(i): i for i in range(m)} |
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235 |
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236 # Generate (n * 2) bit gray code, yield lower n bits as X, and look for |
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237 # the next unused gray code where higher n bits equal to X. |
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238 |
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239 # For gray codes whose higher bits are X, a[X] of them have been used. |
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240 a = [0] * m |
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241 |
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242 # Iterate from 0. |
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243 x = 0 |
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244 yield x |
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245 for i in range(m * m): |
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246 x = reversegray[x] |
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247 y = gray(a[x] + x * m) & (m - 1) |
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248 assert a[x] < m |
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249 a[x] += 1 |
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250 x = y |
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251 yield x |
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252 |
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253 |
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254 def gentext(rev): |
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255 '''Given a revision number, generate dummy text''' |
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256 return b''.join(b'%d\n' % j for j in range(-1, rev % 5)) |
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257 |
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258 |
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259 def writecases(rlog, tr): |
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260 """Write some revisions interested to the test. |
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261 |
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262 The test is interested in 3 properties of a revision: |
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263 |
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264 - Is it a delta or a full text? (isdelta) |
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265 This is to catch some delta application issues. |
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266 - Does it have a flag of EXTSTORED? (isext) |
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267 This is to catch some flag processor issues. Especially when |
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268 interacted with revlog deltas. |
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269 - Is its text empty? (isempty) |
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270 This is less important. It is intended to try to catch some careless |
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271 checks like "if text" instead of "if text is None". Note: if flag |
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272 processor is involved, raw text may be not empty. |
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273 |
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274 Write 65 revisions. So that all combinations of the above flags for |
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275 adjacent revisions are covered. That is to say, |
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276 |
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277 len(set( |
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278 (r.delta, r.ext, r.empty, (r+1).delta, (r+1).ext, (r+1).empty) |
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279 for r in range(len(rlog) - 1) |
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280 )) is 64. |
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281 |
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282 Where "r.delta", "r.ext", and "r.empty" are booleans matching properties |
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283 mentioned above. |
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284 |
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285 Return expected [(text, rawtext)]. |
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286 """ |
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287 result = [] |
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288 for i, x in enumerate(genbits(3)): |
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289 isdelta, isext, isempty = bool(x & 1), bool(x & 2), bool(x & 4) |
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290 if isempty: |
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291 text = b'' |
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292 else: |
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293 text = gentext(i) |
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294 rev = appendrev(rlog, text, tr, isext=isext, isdelta=isdelta) |
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295 |
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296 # Verify text, rawtext, and rawsize |
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297 if isext: |
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298 rawtext = writeprocessor(None, text)[0] |
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299 else: |
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300 rawtext = text |
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301 if rlog.rawsize(rev) != len(rawtext): |
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302 abort('rev %d: wrong rawsize' % rev) |
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303 if rlog.revision(rev, raw=False) != text: |
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304 abort('rev %d: wrong text' % rev) |
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305 if rlog.rawdata(rev) != rawtext: |
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306 abort('rev %d: wrong rawtext' % rev) |
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307 result.append((text, rawtext)) |
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308 |
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309 # Verify flags like isdelta, isext work as expected |
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310 # isdelta can be overridden to False if this or p1 has isext set |
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311 if bool(rlog.deltaparent(rev) > -1) and not isdelta: |
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312 abort('rev %d: isdelta is unexpected' % rev) |
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313 if bool(rlog.flags(rev)) != isext: |
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314 abort('rev %d: isext is ineffective' % rev) |
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315 return result |
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316 |
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317 |
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318 # Main test and checking |
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319 |
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320 |
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321 def checkrevlog(rlog, expected): |
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322 '''Check if revlog has expected contents. expected is [(text, rawtext)]''' |
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323 # Test using different access orders. This could expose some issues |
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324 # depending on revlog caching (see revlog._cache). |
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325 for r0 in range(len(rlog) - 1): |
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326 r1 = r0 + 1 |
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327 for revorder in [[r0, r1], [r1, r0]]: |
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328 for raworder in [[True], [False], [True, False], [False, True]]: |
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329 nlog = newrevlog() |
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330 for rev in revorder: |
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331 for raw in raworder: |
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332 if raw: |
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333 t = nlog.rawdata(rev) |
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334 else: |
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335 t = nlog.revision(rev) |
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336 if t != expected[rev][int(raw)]: |
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337 abort( |
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338 'rev %d: corrupted %stext' |
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339 % (rev, raw and 'raw' or '') |
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340 ) |
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341 |
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342 |
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343 slicingdata = [ |
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344 ([0, 1, 2, 3, 55, 56, 58, 59, 60], [[0, 1], [2], [58], [59, 60]], 10), |
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345 ([0, 1, 2, 3, 55, 56, 58, 59, 60], [[0, 1], [2], [58], [59, 60]], 10), |
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346 ( |
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347 [-1, 0, 1, 2, 3, 55, 56, 58, 59, 60], |
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348 [[-1, 0, 1], [2], [58], [59, 60]], |
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349 10, |
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350 ), |
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351 ] |
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352 |
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353 |
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354 def slicingtest(rlog): |
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355 oldmin = rlog._srmingapsize |
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356 try: |
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357 # the test revlog is small, we remove the floor under which we |
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358 # slicing is diregarded. |
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359 rlog._srmingapsize = 0 |
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360 for item in slicingdata: |
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361 chain, expected, target = item |
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362 result = deltas.slicechunk(rlog, chain, targetsize=target) |
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363 result = list(result) |
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364 if result != expected: |
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365 print('slicing differ:') |
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366 print(' chain: %s' % chain) |
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367 print(' target: %s' % target) |
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368 print(' expected: %s' % expected) |
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369 print(' result: %s' % result) |
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370 finally: |
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371 rlog._srmingapsize = oldmin |
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372 |
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373 |
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374 def md5sum(s): |
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375 return hashlib.md5(s).digest() |
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376 |
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377 |
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378 def _maketext(*coord): |
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379 """create piece of text according to range of integers |
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380 |
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381 The test returned use a md5sum of the integer to make it less |
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382 compressible""" |
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383 pieces = [] |
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384 for start, size in coord: |
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385 num = range(start, start + size) |
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386 p = [md5sum(b'%d' % r) for r in num] |
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387 pieces.append(b'\n'.join(p)) |
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388 return b'\n'.join(pieces) + b'\n' |
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389 |
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390 |
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391 data = [ |
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392 _maketext((0, 120), (456, 60)), |
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393 _maketext((0, 120), (345, 60)), |
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394 _maketext((0, 120), (734, 60)), |
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395 _maketext((0, 120), (734, 60), (923, 45)), |
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396 _maketext((0, 120), (734, 60), (234, 45)), |
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397 _maketext((0, 120), (734, 60), (564, 45)), |
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398 _maketext((0, 120), (734, 60), (361, 45)), |
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399 _maketext((0, 120), (734, 60), (489, 45)), |
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400 _maketext((0, 120), (123, 60)), |
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401 _maketext((0, 120), (145, 60)), |
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402 _maketext((0, 120), (104, 60)), |
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403 _maketext((0, 120), (430, 60)), |
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404 _maketext((0, 120), (430, 60), (923, 45)), |
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405 _maketext((0, 120), (430, 60), (234, 45)), |
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406 _maketext((0, 120), (430, 60), (564, 45)), |
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407 _maketext((0, 120), (430, 60), (361, 45)), |
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408 _maketext((0, 120), (430, 60), (489, 45)), |
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409 _maketext((0, 120), (249, 60)), |
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410 _maketext((0, 120), (832, 60)), |
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411 _maketext((0, 120), (891, 60)), |
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412 _maketext((0, 120), (543, 60)), |
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413 _maketext((0, 120), (120, 60)), |
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414 _maketext((0, 120), (60, 60), (768, 30)), |
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415 _maketext((0, 120), (60, 60), (260, 30)), |
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416 _maketext((0, 120), (60, 60), (450, 30)), |
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417 _maketext((0, 120), (60, 60), (361, 30)), |
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418 _maketext((0, 120), (60, 60), (886, 30)), |
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419 _maketext((0, 120), (60, 60), (116, 30)), |
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420 _maketext((0, 120), (60, 60), (567, 30), (629, 40)), |
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421 _maketext((0, 120), (60, 60), (569, 30), (745, 40)), |
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422 _maketext((0, 120), (60, 60), (777, 30), (700, 40)), |
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423 _maketext((0, 120), (60, 60), (618, 30), (398, 40), (158, 10)), |
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424 ] |
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425 |
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426 |
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427 def makesnapshot(tr): |
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428 rl = newrevlog(name=b'_snaprevlog3.i', recreate=True) |
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429 for i in data: |
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430 appendrev(rl, i, tr) |
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431 return rl |
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432 |
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433 |
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434 snapshots = [-1, 0, 6, 8, 11, 17, 19, 21, 25, 30] |
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435 |
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436 |
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437 def issnapshottest(rlog): |
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438 result = [] |
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439 if rlog.issnapshot(-1): |
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440 result.append(-1) |
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441 for rev in rlog: |
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442 if rlog.issnapshot(rev): |
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443 result.append(rev) |
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444 if snapshots != result: |
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445 print('snapshot differ:') |
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446 print(' expected: %s' % snapshots) |
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447 print(' got: %s' % result) |
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448 |
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449 |
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450 snapshotmapall = {0: [6, 8, 11, 17, 19, 25], 8: [21], -1: [0, 30]} |
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451 snapshotmap15 = {0: [17, 19, 25], 8: [21], -1: [30]} |
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452 |
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453 |
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454 def findsnapshottest(rlog): |
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455 resultall = collections.defaultdict(list) |
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456 deltas._findsnapshots(rlog, resultall, 0) |
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457 resultall = dict(resultall.items()) |
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458 if resultall != snapshotmapall: |
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459 print('snapshot map differ:') |
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460 print(' expected: %s' % snapshotmapall) |
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461 print(' got: %s' % resultall) |
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462 result15 = collections.defaultdict(list) |
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463 deltas._findsnapshots(rlog, result15, 15) |
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464 result15 = dict(result15.items()) |
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465 if result15 != snapshotmap15: |
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466 print('snapshot map differ:') |
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467 print(' expected: %s' % snapshotmap15) |
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468 print(' got: %s' % result15) |
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469 |
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470 |
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471 def maintest(): |
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472 with newtransaction() as tr: |
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473 rl = newrevlog(recreate=True) |
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474 expected = writecases(rl, tr) |
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475 checkrevlog(rl, expected) |
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476 print('local test passed') |
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477 # Copy via revlog.addgroup |
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478 rl1 = addgroupcopy(rl, tr) |
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479 checkrevlog(rl1, expected) |
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480 rl2 = addgroupcopy(rl, tr, optimaldelta=False) |
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481 checkrevlog(rl2, expected) |
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482 print('addgroupcopy test passed') |
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483 # Copy via revlog.clone |
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484 rl3 = newrevlog(name=b'_destrevlog3.i', recreate=True) |
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485 rl.clone(tr, rl3) |
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486 checkrevlog(rl3, expected) |
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487 print('clone test passed') |
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488 # Copy via low-level revlog._addrevision |
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489 rl4 = lowlevelcopy(rl, tr) |
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490 checkrevlog(rl4, expected) |
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491 print('lowlevelcopy test passed') |
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492 slicingtest(rl) |
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493 print('slicing test passed') |
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494 rl5 = makesnapshot(tr) |
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495 issnapshottest(rl5) |
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496 print('issnapshot test passed') |
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497 findsnapshottest(rl5) |
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498 print('findsnapshot test passed') |
31748
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499 |
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500 |
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501 try: |
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502 maintest() |
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503 except Exception as ex: |
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504 abort('crashed: %s' % ex) |