base-files: always use staged sysupgrade

Support for the -d and -p options is dropped; it may be added again at some
point by adding these flags to the ubus sysupgrade call.

A downside of this is that we get a lot less information about the progress
of the upgrade: as soon as the actual upgrade starts, all shell sessions
are killed to allow unmounting the root filesystem.

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

package/base-files/files/sbin/sysupgrade

@@ -1,4 +1,7 @@
 #!/bin/sh
+
+[ "$1" = "nand" ] && exec /lib/upgrade/stage2 "$2" "$3"
+
 . /lib/functions.sh
 . /lib/functions/system.sh
 
@@ -11,7 +14,6 @@ export VERBOSE=1
 export SAVE_CONFIG=1
 export SAVE_OVERLAY=0
 export SAVE_PARTITIONS=1
-export DELAY=
 export CONF_IMAGE=
 export CONF_BACKUP_LIST=0
 export CONF_BACKUP=
@@ -25,7 +27,6 @@ export TEST=0
 while [ -n "$1" ]; do
 	case "$1" in
 		-i) export INTERACTIVE=1;;
-		-d) export DELAY="$2"; shift;;
 		-v) export VERBOSE="$(($VERBOSE + 1))";;
 		-q) export VERBOSE="$(($VERBOSE - 1))";;
 		-n) export SAVE_CONFIG=0;;
@@ -50,10 +51,9 @@ done
 export CONFFILES=/tmp/sysupgrade.conffiles
 export CONF_TAR=/tmp/sysupgrade.tgz
 
-export ARGV="$*"
-export ARGC="$#"
+IMAGE="$1"
 
-[ -z "$ARGV" -a -z "$NEED_IMAGE" -o $HELP -gt 0 ] && {
+[ -z "$IMAGE" -a -z "$NEED_IMAGE" -o $HELP -gt 0 ] && {
 	cat <<EOF
 Usage: $0 [<upgrade-option>...] <image file or URL>
        $0 [-q] [-i] <backup-command> <file>
@@ -90,7 +90,7 @@ EOF
 	exit 1
 }
 
-[ -n "$ARGV" -a -n "$NEED_IMAGE" ] && {
+[ -n "$IMAGE" -a -n "$NEED_IMAGE" ] && {
 	cat <<-EOF
 		-b|--create-backup and -r|--restore-backup do not perform a firmware upgrade.
 		Do not specify both -b|-r and a firmware image.
@@ -136,14 +136,13 @@ sysupgrade_pre_upgrade="fwtool_pre_upgrade"
 
 include /lib/upgrade
 
-[ "$1" = "nand" ] && nand_upgrade_stage2 $@
-
 do_save_conffiles() {
 	local conf_tar="${1:-$CONF_TAR}"
 
 	[ -z "$(rootfs_type)" ] && {
 		echo "Cannot save config while running from ramdisk."
 		ask_bool 0 "Abort" && exit
+		rm -f "$conf_tar"
 		return 0
 	}
 	run_hooks "$CONFFILES" $sysupgrade_init_conffiles
@@ -184,8 +183,33 @@ type platform_check_image >/dev/null 2>/dev/null || {
 	exit 1
 }
 
+case "$IMAGE" in
+	http://*)
+		wget -O/tmp/sysupgrade.img "$IMAGE"
+		IMAGE=/tmp/sysupgrade.img
+		;;
+esac
+
+IMAGE="$(readlink -f "$IMAGE")"
+
+case "$IMAGE" in
+	'')
+		echo "Image file not found."
+		exit 1
+		;;
+	/tmp/*)	;;
+	*)
+		v "Image not in /tmp, copying..."
+		cp -f "$IMAGE" /tmp/sysupgrade.img
+		IMAGE=/tmp/sysupgrade.img
+		;;
+esac
+
+export ARGV="$IMAGE"
+export ARGC=1
+
 for check in $sysupgrade_image_check; do
-	( eval "$check \"\$ARGV\"" ) || {
+	( $check "$IMAGE" ) || {
 		if [ $FORCE -eq 1 ]; then
 			echo "Image check '$check' failed but --force given - will update anyway!"
 			break
@@ -211,6 +235,7 @@ elif ask_bool $SAVE_CONFIG "Keep config files over reflash"; then
 	[ $TEST -eq 1 ] || do_save_conffiles
 	export SAVE_CONFIG=1
 else
+	[ $TEST -eq 1 ] || rm -f "$CONF_TAR"
 	export SAVE_CONFIG=0
 fi
 
@@ -218,28 +243,18 @@ if [ $TEST -eq 1 ]; then
 	exit 0
 fi
 
+if [ $SAVE_PARTITIONS -eq 0 ]; then
+	touch /tmp/sysupgrade.always.overwrite.bootdisk.partmap
+else
+	rm -f /tmp/sysupgrade.always.overwrite.bootdisk.partmap
+fi
+
 run_hooks "" $sysupgrade_pre_upgrade
 
-# Some platforms/devices may want different sysupgrade process, e.g. without
-# killing processes yet or calling ubus system upgrade method.
-# This is needed e.g. on NAND devices where we just want to trigger stage1 at
-# this point.
-if type 'platform_pre_upgrade' >/dev/null 2>/dev/null; then
-	platform_pre_upgrade "$ARGV"
-fi
-
-ubus call system upgrade
-touch /tmp/sysupgrade
-
-if [ ! -f /tmp/failsafe ] ; then
-	kill_remaining TERM
-	sleep 3
-	kill_remaining KILL
-fi
-
-if [ -n "$(rootfs_type)" ]; then
-	v "Switching to ramdisk..."
-	run_ramfs '. /lib/functions.sh; include /lib/upgrade; do_upgrade'
-else
-	do_upgrade
-fi
+install_bin /sbin/upgraded
+v "Commencing upgrade. All shell sessions will be closed now."
+ubus call system sysupgrade "{
+	\"prefix\": \"$RAM_ROOT\",
+	\"path\": $(json_string "$IMAGE"),
+	\"command\": \". /lib/functions.sh; include /lib/upgrade; do_upgrade_stage2\"
+}"