Selinux bash prompt decorations

[Ivan Gyurdiev]

Hi,

Redhat would like to add more decoration options to the bash prompt.
We want to make the 4 SELinux fields available on the prompt:

- current SELinux user
- current SELinux role
- current SELinux type
- current MLS clearance

This would require dependency on libselinux, libsetrans, and libsepol - 
the 3 main selinux libraries.
[ of course integration would be optional ].

We would like this functionality to be available upstream, rather than 
maintaining our own patch.  Are there any objections to this plan? Can 
you suggest prompt escapes to use for the 4 new fields? Are 2-letter 
escapes acceptable? We can use /zu, /zr, /zt, /zm, since the letter z is 
already used elsewhere for selinux-related things.