Use patch.patch() when checking for patch availability. The test is closer to what we want to know. It also makes sense when you deal with patched versions of patch() as most people do under win32.

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#!/bin/sh

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hg init dir

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cd dir

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echo bleh > bar

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hg add bar

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hg ci -m 'add bar'

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hg cp bar foo

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echo >> bar

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hg ci -m 'cp bar foo; change bar'

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hg debugrename foo

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hg debugindex .hg/store/data/bar.i