Be more specific about what changed on an update

lib/update-bridgehead.sh

@@ -19,6 +19,8 @@ checkOwner /etc/bridgehead bridgehead || fail_and_report 1 "Update failed: Wrong
 
 CREDHELPER="/srv/docker/bridgehead/lib/gitpassword.sh"
 
+CHANGES=""
+
 # Check git updates
 for DIR in /etc/bridgehead $(pwd); do
   log "INFO" "Checking for updates to git repo $DIR ..."
@@ -39,7 +41,9 @@ for DIR in /etc/bridgehead $(pwd); do
   new_git_hash="$(git -C $DIR rev-parse --verify HEAD)"
   git_updated="false"
   if [ "$old_git_hash" != "$new_git_hash" ]; then
-    log "INFO" "Updated git repository in ${DIR} from commit $old_git_hash to $new_git_hash"
+    CHANGE="Updated git repository in ${DIR} from commit $old_git_hash to $new_git_hash"
+    CHANGES+="$CHANGE\n"
+    log "INFO" "$CHANGE"
     # NOTE: Link generation doesn't work on repositories placed at an self-hosted instance of bitbucket.
     # See: https://community.atlassian.com/t5/Bitbucket-questions/BitBucket-4-14-diff-between-any-two-commits/qaq-p/632974
     git_repository_url="$(git -C $DIR remote get-url origin)"
@@ -63,14 +67,16 @@ docker_updated="false"
 for IMAGE in $(cat $PROJECT/docker-compose.yml | grep "image:" | sed -e 's_^.*image: \(.*\).*$_\1_g; s_\"__g'); do
   log "INFO" "Checking for Updates of Image: $IMAGE"
   if docker pull $IMAGE | grep "Downloaded newer image"; then
-    log "INFO" "$IMAGE updated."
+    CHANGE="Image $IMAGE updated."
+    CHANGES+="$CHANGE\n"
+    log "INFO" "$CHANGE"
     docker_updated="true"
   fi
 done
 
 # If anything is updated, restart service
 if [ $git_updated = "true" ] || [ $docker_updated = "true" ]; then
-  RES="Update detected, now restarting bridgehead"
+  RES="Updates detected, now restarting bridgehead:\n$CHANGES"
   log "INFO" "$RES"
   hc_send log "$RES"
   sudo /bin/systemctl restart bridgehead@*.service