epm full-upgrade: do fatal on errors

bin/epm-full_upgrade

@@ -19,16 +19,16 @@
 
 epm_full_upgrade()
 {
-	docmd epm update || return
+	docmd epm update || fatal "repository updating is failed."
 
 	[ -n "$quiet" ] || echo
-	docmd epm upgrade || return
+	docmd epm upgrade || fatal "upgrading of the system is failed."
 
 	[ -n "$quiet" ] || echo
-	docmd epm update-kernel || return
+	docmd epm update-kernel || fatal "updating of the kernel is failed."
 
 	[ -n "$quiet" ] || echo
-	docmd epm play --update all || return
+	docmd epm play --update all || fatal "updating of applications installed via epm play is failed."
 
 	[ -n "$quiet" ] || echo
 	docmd epm clean