# The virtio-gpu driver, as an ordinary process.
#
# docs/plan/hybrid.md milestone H2. This manifest is the "the driver restarts"
# half of it: KeepAlive means schinit brings vgpud back when it dies, and
# because PID 1 forks every job, a driver that crashes is reaped and replaced by
# the same machinery that looks after a shell. Nothing about driver recovery is
# special -- that is the point.
#
# Enabled unconditionally, and safe to be, on two machines it is not written
# for: one with no virtio-gpu at all, and one where the GPU is the only display
# and the kernel therefore refuses to hand it over (virtio_gpu.c's release
# hook). In both cases vgpud says so and exits SCHINIT_EXIT_NORESTART, which
# stops KeepAlive from starting it again -- the alternative, measured, is
# fifteen spawns in forty-five seconds, each printing a line to the console for
# the rest of the uptime. No per-machine configuration either way.

Label     = os.schos.vgpud
Program   = /bin/vgpud
Args      = vgpud
RunAtLoad = yes
KeepAlive = yes

# Higher than a shell's second, because a driver that cannot claim its device
# will fail identically every time and there is no user waiting on it. Low
# enough that a kill is answered while you are still looking at the screen.
ThrottleInterval = 3

# It has no terminal and wants none: a driver that seized the console would be
# doing exactly what moving it out of the kernel was meant to stop.
StandardOut   = /dev/tty1
StandardError = /dev/tty1