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self.path = self.useFixture(TempDirectory()).join("run")
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# Work only in `run`; reference the old $MAAS_ROOT.
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etc = Path(self.path).joinpath("etc")
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# Create and populate $MAAS_ROOT/run/etc/{ntp,ntp.conf}. The
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# `.keep` file is not strictly necessary, but it's created for
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# consistency with the source tree's `run` directory.