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Why does a fakechroot exist?

chroot, sudo

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The process that chroot starts is a new process; it does not replace an existing process (and certainly does not replace PID 1 in the global zone).

You might be able to use chroot to start a non-global zone with an alternative root directory and have that affect all processes run in that zone, but I no longer have access to a system where I could verify whether or not that would work.
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