From 2985d53b7a06d8a1712493aa899d6ffcfacd9e3b Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@felloff.net>
Date: Sun, 16 Sep 2018 22:35:16 +0200
Subject: bootrc: add experimental reboot method to load another kernel

syntax: reboot!bootfile[!method...]

this echos bootfile to /dev/reboot, causing bootfile kernel
to be started.

when method is given, we first connect to the filesystem and
set bootargs so that bootfile can be loaded from the target
network or local fileserver.

note, when no bootfile is given, this causes the kernel to
reboot to bios.
---
 sys/src/9/boot/bootfs.proto |  1 +
 sys/src/9/boot/reboot.rc    | 56 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100755 sys/src/9/boot/reboot.rc

diff --git a/sys/src/9/boot/bootfs.proto b/sys/src/9/boot/bootfs.proto
index a59ad6db5..1bffa0c47 100644
--- a/sys/src/9/boot/bootfs.proto
+++ b/sys/src/9/boot/bootfs.proto
@@ -48,6 +48,7 @@ $objtype
 rc
 	lib
 		rcmain
+		reboot.rc 555 sys sys ../boot/reboot.rc
 		local.rc 555 sys sys ../boot/local.rc
 		net.rc 555 sys sys ../boot/net.rc
 	bin
diff --git a/sys/src/9/boot/reboot.rc b/sys/src/9/boot/reboot.rc
new file mode 100755
index 000000000..536ac2009
--- /dev/null
+++ b/sys/src/9/boot/reboot.rc
@@ -0,0 +1,56 @@
+#!/bin/rc
+
+fn configreboot {
+	if(~ $"* *!*){
+		*=`{echo $* | sed 's,!, ,'}
+		shift
+		*=`{echo $* | sed 's,!, ,'}
+		x=m$1
+		x=$$x
+		shift
+
+		# config method
+		$x(1) $*
+	}
+}
+
+fn connectreboot {
+	if(~ $"* *!*){
+		*=`{echo $* | sed 's,!, ,'}
+		bootfile=$1
+		shift
+		bootargs=$*
+		*=`{echo $* | sed 's,!, ,'}
+		x=m$1
+		x=$$x
+		shift
+
+		# connect method
+		$x(2) $*
+
+		rfork ne
+
+		# set new kernel parameters
+		echo -n $bootargs > '#ec/bootargs'
+
+		# remove part of our temporary root
+		/mnt/broot/$cputype/bin/unmount /$cputype/bin /bin
+		/mnt/broot/$cputype/bin/unmount /rc/bin /bin
+		/mnt/broot/$cputype/bin/unmount /
+
+		# create the name space, mount the root fs
+		/mnt/broot/$cputype/bin/bind / /
+		/mnt/broot/$cputype/bin/mount -ac '#s/boot' /
+	}
+	if not {
+		bootfile=$1
+	}
+
+	# load the new kernel
+	/mnt/broot/$cputype/bin/echo reboot $bootfile > /dev/reboot
+	exit 'reboot failed'
+}
+
+mreboot=(configreboot connectreboot)
+
+mt=(mreboot $mt)
-- 
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