Obtaining Default Context for SELinux Users

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We're currently running into issues attempting to get a default
context for a newly added SELinux user.

The user has been added with semanage, and associated with a few
roles. There are role declarations and allows (to and from the "scon"
role) in place in the policy. We've also added entries to
/etc/selinux/mls/contexts/{default_contexts,users/foo_u} to facilitate
getting a default context for the SELinux user.

The desire is to switch security labels based on the specified user's
default context, like so:
root:staff_r:staff_t:s0 -> foo_u:foo_r:foo_t:s0

We're using a call to `get_default_context("foo_u",
"root:staff_r:staff_t:s0", &new_context)` to get the default, but that
doesn't seem to be finding working.

In testing with a more verbose version of security_compute_user_raw,
we noticed that the list of available contexts for foo_u are empty.
This behavior has been noted for staff_u as well.

Curious to know if there's something glaringly obvious that we're missing.

Respectfully,
Mike
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