Merge pull request #417 from balena-os/add-entry-script

Add entry.sh wrapper script

Author: flowzone-app[bot]

Dockerfile

@@ -1,4 +1,7 @@
 FROM scratch
 
+# Copies the update scripts to the app subdirectory to allow for future use of
+# other subdirectories.
 WORKDIR /app
+COPY ./entry.sh ./entry.sh
 COPY ./upgrade-2.x.sh ./upgrade-2.x.sh

entry.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+# Optional wrapper to execute a host OS update. This wrapper provides a fixed
+# entry point for Supervisor managed OS updates, allowing us to change the working
+# script as the host update process evolves without altering how the Supervisor
+# starts the update.
+#
+# Runs the working script in the current process with the arguments provided to
+# this script.
+exec ./upgrade-2.x.sh "$@"