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Corrupt an hg repo with two pulls.
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create one repo with a long history
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$ hg init source1
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$ cd source1
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$ touch foo
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$ hg add foo
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$ for i in 1 2 3 4 5 6 7 8 9 10; do
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> echo $i >> foo
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> hg ci -m $i
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> done
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$ cd ..
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create one repo with a shorter history
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$ hg clone -r 0 source1 source2
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adding changesets
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adding manifests
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adding file changes
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added 1 changesets with 1 changes to 1 files
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updating to branch default
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1 files updated, 0 files merged, 0 files removed, 0 files unresolved
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$ cd source2
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$ echo a >> foo
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$ hg ci -m a
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$ cd ..
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create a third repo to pull both other repos into it
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$ hg init corrupted
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$ cd corrupted
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use a hook to make the second pull start while the first one is still running
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$ echo '[hooks]' >> .hg/hgrc
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$ echo 'prechangegroup = sleep 5' >> .hg/hgrc
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start a pull...
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$ hg pull ../source1 > pull.out 2>&1 &
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... and start another pull before the first one has finished
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$ sleep 1
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$ hg pull ../source2 2>/dev/null
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pulling from ../source2
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searching for changes
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adding changesets
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adding manifests
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adding file changes
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added 1 changesets with 1 changes to 1 files (+1 heads)
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(run 'hg heads' to see heads, 'hg merge' to merge)
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$ cat pull.out
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pulling from ../source1
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requesting all changes
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adding changesets
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adding manifests
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adding file changes
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added 10 changesets with 10 changes to 1 files
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(run 'hg update' to get a working copy)
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see the result
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$ wait
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$ hg verify
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checking changesets
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checking manifests
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crosschecking files in changesets and manifests
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checking files
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1 files, 11 changesets, 11 total revisions
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$ cd ..
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