From Fedora Project Wiki

SELinux Plugin

On SELinux enabled box, this plugin will pretend, that SELinux is disabled in build environment.

  • fake /proc/filesystems is mounted into build environment, excluding selinuxfs
  • option '--setopt=tsflags=nocontext' is appended to each 'yum' command

This plugin is enabled by default and there is actually no way to disable it.

This plugin is not used with NSPAWN chroot ("--new-chroot" option) and will be removed when NSPAWN chroot will be only one option.