Add suc-upgrade package

packages/system/suc-upgrade/build.yaml

@@ -0,0 +1,4 @@
+image: "alpine"
+
+steps:
+- cp -rfv suc-upgrade.sh /usr/sbin/suc-upgrade && chmod +x /usr/sbin/suc-upgrade

packages/system/suc-upgrade/definition.yaml

@@ -0,0 +1,3 @@
+name: "suc-upgrade"
+category: "system"
+version: "0.1"

packages/system/suc-upgrade/suc-upgrade.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+set -x -e
+HOST_DIR="${HOST_DIR:-/host}"
+
+if [ "$FORCE" != "true" ]; then
+    if diff /etc/os-release $HOST_DIR/etc/os-release >/dev/null; then
+        echo Update to date with
+        cat /etc/os-release
+        exit 0
+    fi
+fi
+
+mount --rbind $HOST_DIR/dev /dev
+mount --rbind $HOST_DIR/run /run
+elemental upgrade --directory /
+nsenter -i -m -t 1 -- reboot
+exit 1