What is the best way to find out (in a script) whether SElinux is used?

[Daniel J Walsh]

Aleksey Nogin wrote:

> I want to have a script that acts slightly differently depending on 
> whether SELinux is being used or not. What is the best way to do it?
>
> My initial attempts to use "-e /etc/security/selinux" or "-e 
> /selinux/enforce" all create log messages:
>
> audit(1079689937.170:0): avc:  denied  { getattr } for  pid=2662 
> exe=/bin/bash path=/etc/security/selinux dev=hda2 ino=3712021 
> scontext=aleksey:staff_r:staff_t 
> tcontext=system_u:object_r:policy_config_t tclass=dir
> audit(1079690744.526:0): avc:  denied  { getattr } for  pid=3577 
> exe=/bin/bash path=/selinux/enforce dev= ino=4 
> scontext=aleksey:staff_r:staff_t tcontext=system_u:object_r:security_t 
> tclass=file
>
/usr/bin/selinuxenabled

Exits with status 0 if enabled.

Dan