Function reexecute_self_for_selinux_if_needed 

pub(crate) fn reexecute_self_for_selinux_if_needed(
    srcdata: &SourceInfo,
    override_disable_selinux: bool,
) -> Result<SELinuxFinalState>

If we detect that the target ostree commit has SELinux labels, and we aren’t passed an override to disable it, then ensure the running process is labeled with install_t so it can write arbitrary labels.