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bootrc: unmount devip *before* starting factotum

we want devip to get reattached after hostowner has been written. factotum
already handles this with a private authdial() routine that mounts devip
when it is not present. so we detach devmnt before starting factotum,
and attach once factotum finishes.

--- a/sys/src/9/boot/bootrc

+++ b/sys/src/9/boot/bootrc

@@ -86,6 +86,9 @@

 	# authentication agent

 	if(! test -f /srv/factotum){

+		# we remount ip inteface after hostowner is set

+		unmount '#I' /net >[2]/dev/null

+

 		x=(/boot/factotum -n -sfactotum)

 		if(~ $service cpu)

 			x=($x -S)

@@ -95,8 +98,6 @@

 			x=($x -p)

 		must $x

-		# remount ip inteface after hostowner is set

-		unmount '#I' /net >[2]/dev/null

 		bind -qa '#I' /net

 	}