author | Pierre-Yves David <pierre-yves.david@octobus.net> |
Thu, 04 May 2017 12:47:27 +0200 | |
changeset 32169 | aeb060dd7ac9 |
parent 31764 | 15707e58fc3d |
child 33625 | 6788e648efcf |
permissions | -rw-r--r-- |
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# test revlog interaction about raw data (flagprocessor) |
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from __future__ import absolute_import, print_function |
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import sys |
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from mercurial import ( |
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encoding, |
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node, |
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revlog, |
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transaction, |
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vfs, |
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) |
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# TESTTMP is optional. This makes it convenient to run without run-tests.py |
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tvfs = vfs.vfs(encoding.environ.get('TESTTMP', b'/tmp')) |
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# Enable generaldelta otherwise revlog won't use delta as expected by the test |
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tvfs.options = {'generaldelta': True, 'revlogv1': True} |
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# The test wants to control whether to use delta explicitly, based on |
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# "storedeltachains". |
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revlog.revlog._isgooddelta = lambda self, d, textlen: self.storedeltachains |
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def abort(msg): |
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print('abort: %s' % msg) |
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# Return 0 so run-tests.py could compare the output. |
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sys.exit() |
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# Register a revlog processor for flag EXTSTORED. |
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# |
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# It simply prepends a fixed header, and replaces '1' to 'i'. So it has |
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# insertion and replacement, and may be interesting to test revlog's line-based |
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# deltas. |
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_extheader = b'E\n' |
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def readprocessor(self, rawtext): |
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# True: the returned text could be used to verify hash |
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text = rawtext[len(_extheader):].replace(b'i', b'1') |
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return text, True |
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def writeprocessor(self, text): |
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# False: the returned rawtext shouldn't be used to verify hash |
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rawtext = _extheader + text.replace(b'1', b'i') |
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return rawtext, False |
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def rawprocessor(self, rawtext): |
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# False: do not verify hash. Only the content returned by "readprocessor" |
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# can be used to verify hash. |
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return False |
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revlog.addflagprocessor(revlog.REVIDX_EXTSTORED, |
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(readprocessor, writeprocessor, rawprocessor)) |
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# Utilities about reading and appending revlog |
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def newtransaction(): |
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# A transaction is required to write revlogs |
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report = lambda msg: None |
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return transaction.transaction(report, tvfs, {'plain': tvfs}, b'journal') |
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def newrevlog(name=b'_testrevlog.i', recreate=False): |
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if recreate: |
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tvfs.tryunlink(name) |
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rlog = revlog.revlog(tvfs, name) |
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return rlog |
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def appendrev(rlog, text, tr, isext=False, isdelta=True): |
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'''Append a revision. If isext is True, set the EXTSTORED flag so flag |
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processor will be used (and rawtext is different from text). If isdelta is |
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True, force the revision to be a delta, otherwise it's full text. |
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''' |
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nextrev = len(rlog) |
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p1 = rlog.node(nextrev - 1) |
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p2 = node.nullid |
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if isext: |
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flags = revlog.REVIDX_EXTSTORED |
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else: |
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flags = revlog.REVIDX_DEFAULT_FLAGS |
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# Change storedeltachains temporarily, to override revlog's delta decision |
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rlog.storedeltachains = isdelta |
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try: |
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rlog.addrevision(text, tr, nextrev, p1, p2, flags=flags) |
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return nextrev |
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except Exception as ex: |
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abort('rev %d: failed to append: %s' % (nextrev, ex)) |
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finally: |
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# Restore storedeltachains. It is always True, see revlog.__init__ |
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rlog.storedeltachains = True |
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def addgroupcopy(rlog, tr, destname=b'_destrevlog.i', optimaldelta=True): |
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'''Copy revlog to destname using revlog.addgroup. Return the copied revlog. |
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This emulates push or pull. They use changegroup. Changegroup requires |
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repo to work. We don't have a repo, so a dummy changegroup is used. |
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If optimaldelta is True, use optimized delta parent, so the destination |
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revlog could probably reuse it. Otherwise it builds sub-optimal delta, and |
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the destination revlog needs more work to use it. |
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This exercises some revlog.addgroup (and revlog._addrevision(text=None)) |
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code path, which is not covered by "appendrev" alone. |
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''' |
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class dummychangegroup(object): |
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@staticmethod |
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def deltachunk(pnode): |
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pnode = pnode or node.nullid |
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parentrev = rlog.rev(pnode) |
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r = parentrev + 1 |
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if r >= len(rlog): |
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return {} |
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if optimaldelta: |
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deltaparent = parentrev |
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else: |
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# suboptimal deltaparent |
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deltaparent = min(0, parentrev) |
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return {'node': rlog.node(r), 'p1': pnode, 'p2': node.nullid, |
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'cs': rlog.node(rlog.linkrev(r)), 'flags': rlog.flags(r), |
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'deltabase': rlog.node(deltaparent), |
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'delta': rlog.revdiff(deltaparent, r)} |
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def linkmap(lnode): |
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return rlog.rev(lnode) |
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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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# Test using different access orders. This could expose some issues |
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# depending on revlog caching (see revlog._cache). |
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for r0 in range(len(rlog) - 1): |
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r1 = r0 + 1 |
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for revorder in [[r0, r1], [r1, r0]]: |
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for raworder in [[True], [False], [True, False], [False, True]]: |
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nlog = newrevlog() |
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for rev in revorder: |
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for raw in raworder: |
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t = nlog.revision(rev, raw=raw) |
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if t != expected[rev][int(raw)]: |
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abort('rev %d: corrupted %stext' |
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% (rev, raw and 'raw' or '')) |
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266 |
|
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def maintest(): |
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expected = rl = None |
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with newtransaction() as tr: |
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rl = newrevlog(recreate=True) |
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expected = writecases(rl, tr) |
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checkrevlog(rl, expected) |
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print('local test passed') |
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# Copy via revlog.addgroup |
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rl1 = addgroupcopy(rl, tr) |
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checkrevlog(rl1, expected) |
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rl2 = addgroupcopy(rl, tr, optimaldelta=False) |
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checkrevlog(rl2, expected) |
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print('addgroupcopy test passed') |
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# Copy via revlog.clone |
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rl3 = newrevlog(name='_destrevlog3.i', recreate=True) |
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rl.clone(tr, rl3) |
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checkrevlog(rl3, expected) |
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print('clone test passed') |
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# Copy via low-level revlog._addrevision |
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rl4 = lowlevelcopy(rl, tr) |
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checkrevlog(rl4, expected) |
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print('lowlevelcopy test passed') |
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289 |
|
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try: |
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maintest() |
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except Exception as ex: |
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abort('crashed: %s' % ex) |