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https://bz.mercurial-scm.org/2137
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Setup:
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create a little extension that has 3 side-effects:
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1) ensure changelog data is not inlined
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2) make revlog to use lazyparser
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3) test that repo.lookup() works
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1 and 2 are preconditions for the bug; 3 is the bug.
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$ cat > commitwrapper.py <<EOF
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> from mercurial import extensions, node, revlog
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>
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> def reposetup(ui, repo):
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> class wraprepo(repo.__class__):
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> def commit(self, *args, **kwargs):
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> result = super(wraprepo, self).commit(*args, **kwargs)
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> tip1 = node.short(repo.changelog.tip())
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> tip2 = node.short(repo.lookup(tip1))
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> assert tip1 == tip2
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> ui.write(b'new tip: %s\n' % tip1)
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> return result
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> repo.__class__ = wraprepo
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>
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> def extsetup(ui):
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> revlog._maxinline = 8 # split out 00changelog.d early
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> revlog._prereadsize = 8 # use revlog.lazyparser
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> EOF
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$ cat >> $HGRCPATH <<EOF
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> [extensions]
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> commitwrapper = `pwd`/commitwrapper.py
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> EOF
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$ hg init repo1
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$ cd repo1
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$ echo a > a
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$ hg commit -A -m'add a with a long commit message to make the changelog a bit bigger'
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adding a
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new tip: 553596fad57b
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Test that new changesets are visible to repo.lookup():
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$ echo a >> a
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$ hg commit -m'one more commit to demonstrate the bug'
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new tip: 799ae3599e0e
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$ hg tip
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changeset: 1:799ae3599e0e
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tag: tip
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user: test
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date: Thu Jan 01 00:00:00 1970 +0000
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summary: one more commit to demonstrate the bug
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$ cd ..
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