entrypoint monitors for *-updates.txt files

completed px4 update generates updates.txt file to signal update has finished.
Monitor for this file to appear and match it to px4 files. For debugging
echo the contents of the -updates.txt to log

Tools/px_uploader.entrypoint

@@ -83,3 +83,8 @@ if [ -n "$PX4_EXPORT_DIR" ]; then
     # move temp json file to the final json file
     mv ${TEMP_JSON} $PX4_EXPORT_DIR/${SALUKI_FILE_INFO_JSON}
 fi
+
+# when px4 update is complete, it will generate -updates.txt file mathing with px4 filename
+# for example: ssrc_saluki-v3_default-1.14.0-12.0.0-66-g97a3fa5c5f-updates.txt
+# monitor for the -updates.txt files and exit if it is valid
+inotifyd validate_updates_txt.sh ${PX4_EXPORT_DIR}:n

Tools/validate_updates_txt.sh

@@ -0,0 +1,26 @@
+#! /bin/bash -eu
+
+die () {
+  echo >&2 "$@"
+  exit 1
+}
+
+[[ "$#" -eq 3 ]] || die "$0 (operation) (dir) (file)"
+DIR=$2
+FILE=$3
+
+if [[ -e ${FILE} ]]; then
+  echo "${FILE} appeared"
+  matching_px4_file=$(echo ${FILE} | sed 's/-updates.txt$/.px4/')
+  echo "matching px4 file should be: $matching_px4_file"
+  if [[ -e ${matching_px4_file} ]]; then
+    echo "updates.txt and px4 file found"
+
+    echo "contents of ${FILE}:"
+    cat ${FILE}
+
+    echo "update has finished, exiting"
+    # exit with status 1 do signal exit has finished
+    exit 1
+  fi
+fi