WIP kexec script for testing on different hardware

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

Dockerfile.remora

@@ -0,0 +1,8 @@
+FROM justincormack/alpine-kexec
+
+ADD alpine/initrd.img .
+ADD alpine/kernel/vmlinuz64 .
+
+ADD remora/do-kexec.sh /usr/local/bin
+
+ENTRYPOINT ["/usr/local/bin/do-kexec.sh"]

Makefile

@@ -17,7 +17,12 @@ qemu-arm: Dockerfile.armhf arm
 	docker build -f Dockerfile.qemu.armhf -t mobyarmqemu:build .
 	docker run -it mobyarmqemu:build
 
+.PHONY: remora clean
+remora: Dockerfile.remora remora/do-kexec.sh
+	docker build -f Dockerfile.remora -t justincormack/remora .
+
 clean:
 	$(MAKE) -C alpine clean
 	$(MAKE) -C xhyve clean
 	docker images -q mobyqemu:build | xargs docker rmi -f
+	docker images -q justincormack/remora | xargs docker rmi -f

remora/do-kexec.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+set -ex
+
+APPEND="$*"
+
+[ -z "$*" ] && APPEND="$(cat /proc/cmdline)"
+
+gzip initrd.img
+
+mv initrd.img.gz vmlinuz64 /var/tmp
+
+kexec -f /var/tmp/vmlinuz64 --initrd=/var/tmp/initrd.img.gz --append="$APPEND"
+kexec -e