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This is a first pass at handling password/group calls, allowing
the use of custom password/group files. In particular, when
chroot()ed to a particular directory, pseudo picks files in
that directory by default, to improve support for the typical
use case where pseudo uses chroot() only to jump into a virtual
target filesystem.
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This allows us to track execution, although the tracking for it
requires some additional thought -- the basic assumption is that we
don't want to canonicalize names into the chroot() directory, but
since all the filename canonicalization assumes that we want this,
that will take some sneaking. It's a little useful as is, though,
so I'm running with it.
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Add chroot() and a large number of things needed to make it work.
The list of intercepted calls is large but not exhaustive.
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* Improve makewrappers handling of function pointer arguments.
* Regenerate wrappers when makewrappers is touched.
* Move path resolution from pseudo_client_op into wrapper
functions.
* Eliminate dependency on PATH_MAX.
* Related cleanup, such as tracking CWD better, and using
the tracked value for getcwd().
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