fstools: snapshot: handle jffs2 conversion using upgraded

We can reuse the kill_remaining and run_ramfs facilities of the stage2 run
by upgraded.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

package/system/fstools/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=fstools
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(LEDE_GIT)/project/fstools.git

package/system/fstools/files/snapshot

@@ -64,14 +64,16 @@ do_convert_jffs2() {
 do_convert() {
 	. /lib/functions.sh
 	. /lib/upgrade/common.sh
-	ubus call system upgrade
-	touch /tmp/sysupgrade
+
 	cd /overlay/upper
 	tar czf /tmp/snapshot.tar.gz *
-	kill_remaining TERM
-	sleep 3
-	kill_remaining KILL
-	run_ramfs '. /sbin/snapshot; do_convert_jffs2'
+
+	install_bin /sbin/upgraded
+	ubus call system sysupgrade "{
+		\"prefix\": \"$RAM_ROOT\",
+		\"path\": \"\",
+		\"command\": \". /sbin/snapshot; do_convert_jffs2\"
+	}"
 }
 
 [ -n "$(cat /proc/mounts|grep /overlay|grep jffs2)" ] && {