boot menu option to disable graphics mode

[Konstantin Belousov]

On Thu, Jun 07, 2012 at 10:45:26AM +0300, Andriy Gapon wrote:
> 
> It's long been a wish of mine to have an ability to decide at boot time that a
> system should boot in "console-only" mode.  That is, that no graphics/X
> applications like e.g. xdm/kdm/gdm are automatically started even when they are
> configured to do so.
> 
> Here is my attempt at implementing that:
> https://gitorious.org/~avg/freebsd/avgbsd/commit/96f7051d63d4286ef6f0196d241e7855338a6ed7?format=patch
> 
> All the option does at boot time is setting of 'inhibit_gui' variable for kernel
> environment.  I envision that this variable could be properly and gracefully
> handled in various startup scripts and/or application startup logic.
> But to ensure that the option is always honored I've also added "ultimate
> protection" to syscons that prohibits KDSETMODE/KD_GRAPHICS ioctl.
This is too much, IMO. I understand why you may want to disable
auto-start of login manager, but preventing a user from running X at all
until she learns about kenv -u _and_ obscure code somewhere in the kernel,
is unreasonable.
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