Merge pull request #74 from hnez/flexible-rauc-migrate

meta-lxatac-software: bundles: hook.sh: migrate user-specified files

Author: jluebbe

README.md

@@ -27,6 +27,18 @@ bundle on your TAC:
 
 If that does not work you may want to [re-install via USB](#installing-images-via-usb).
 
+If you've made changes to your TACs configuration that you want to preserve,
+which are not covered by the default update migration logic,
+you can add a list of additional files to migrate to the
+`/etc/rauc/migrate.d`:
+
+    root@lxatac-00010:~ cat /etc/rauc/migrate.d/git_config.conf
+    /etc/gitconfig
+    /home/root/.gitconfig
+
+If that is not enough customization for you then read on to learn
+how to build fully-custom images for your LXA TAC.
+
 Building the image as-is
 ------------------------
 

meta-lxatac-software/recipes-core/bundles/files/hook.sh

@@ -2,6 +2,7 @@
 
 set -exu -o pipefail
 
+EXTRA_MIGRATE_LISTS_DIR="/etc/rauc/migrate.d"
 CERT_AVAILABLE_DIR="${RAUC_SLOT_MOUNT_POINT}/etc/rauc/certificates-available"
 CERT_ENABLED_DIR="${RAUC_SLOT_MOUNT_POINT}/etc/rauc/certificates-enabled"
 
@@ -44,6 +45,22 @@ function migrate () {
 	cp -a "$1" "${RAUC_SLOT_MOUNT_POINT}/$1"
 }
 
+function process_migrate_lists () {
+	if [ ! -d "${EXTRA_MIGRATE_LISTS_DIR}" ]; then
+		return
+	fi
+
+	for migrate_list in "${EXTRA_MIGRATE_LISTS_DIR}"/*.conf; do
+		# Migrate files in the list line by line
+		while read -r line; do
+			migrate "${line}"
+		done < "${migrate_list}"
+
+		# Also migrate the list itself
+		migrate "${migrate_list}"
+	done
+}
+
 case "$1" in
 	slot-post-install)
 		enable_certificates
@@ -63,6 +80,12 @@ case "$1" in
 		migrate /home/root/.bash_history
 		migrate /home/root/.ssh/authorized_keys
 		migrate /var/cache/lxa-iobus/lss-cache
+
+		# Also allow the running system to specify additional files to
+		# migrate to the new slot via files in /etc/rauc/migrate.d.
+                # The files should contain one file per line that should be
+                # migrated to the new slot.
+		process_migrate_lists
 		;;
 	*)
 		exit 1