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kernel: bootrc: add bootloop=

--- a/sys/man/8/plan9.ini

+++ b/sys/man/8/plan9.ini

@@ -712,6 +712,12 @@

 prompt and use

 .I value

 as the answer instead.

+.SS \fLbootloop=\fIvalue\fP

+Always use

+.I value

+as the answer to the

+.L bootargs

+prompt, retrying if unsuccessful.

 .SS \fLrootdir=\fB/root/\fIdir\fP

 .SS \fLrootspec=\fIspec\fP

 Changes the mount arguments for the root file server

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

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

@@ -68,6 +68,11 @@

 fn main{

 	mp=()

 	while(~ $#mp 0){

+		if(! ~ $#bootloop 0){

+			nobootprompt=$bootloop

+			# 'flatten' for the next boot

+			echo -n $bootloop > '#ec/bootloop'

+		}

 		if(~ $#nobootprompt 0){

 			echo

 			showlocaldevs

--- a/sys/src/9/boot/reboot.rc

+++ b/sys/src/9/boot/reboot.rc

@@ -32,6 +32,7 @@

 		# set new kernel parameters

 		echo -n $bootargs > '#ec/bootargs'

+		rm -f '#ec/bootloop'

 		# remove part of our temporary root

 		/mnt/broot/$cputype/bin/unmount /$cputype/bin /bin

-- 

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