publish some update scripts

grocy-update.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+APP=grocy
+ORG=grocy # Organisation or GitHub user
+REPO=grocy
+LOCAL_VERSION=$(jq --raw-output .Version /var/www/virtual/"$USER"/grocy/version.json)
+TAG_NAME=$(curl -s https://api.github.com/repos/$ORG/$REPO/releases/latest | jq --raw-output .tag_name)
+LATEST_VERSION=${TAG_NAME:1} # It is common to use the prefix v for the version tag.
+
+## this is a helper function to compare two versions as a "lower than" operator
+function version_lt
+{
+  test "$(echo "$@" |
+    tr " " "n" |
+    sort --version-sort --reverse |
+    head --lines=1)" != "$1"
+}
+
+if [ "$LOCAL_VERSION" = "$LATEST_VERSION" ]; then
+  echo "Your $APP is running on $LOCAL_VERSION and it is already up to date."
+else
+  if version_lt "$LOCAL_VERSION" "$LATEST_VERSION"
+  then
+    echo "There is a new Version available of $ORG"
+    echo "The latest Version is $LATEST_VERSION"
+    echo "Your local Version is $LOCAL_VERSION"
+    bash /var/www/virtual/"$USER"/grocy/update.sh
+  fi
+fi