publish some update scripts

uptime-kuma-update.sh

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+
+APP_NAME="Uptime Kuma"
+ORG=louislam # Organisation or GitHub user
+REPO=uptime-kuma
+GITHUB_API_URL=https://api.github.com/repos/$ORG/$REPO/releases/latest
+
+function get_local_version
+{
+  LOCAL_VERSION=$(git describe --tags)
+}
+
+function get_latest_version
+{
+  LATEST_VERSION=$(curl --silent $GITHUB_API_URL |
+    jq --raw-output .tag_name)
+}
+
+function do_update_procedure
+{
+  git fetch --all
+  git checkout "$LATEST_VERSION" --force
+  npm ci --production
+  npm run download-dist
+  supervisorctl restart uptime-kuma
+  sleep 3
+  supervisorctl status
+}
+
+## 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)" != "$1"
+}
+
+function main
+{
+  cd ~/uptime-kuma || exit 1
+  get_local_version
+  get_latest_version
+
+  if [ "$LOCAL_VERSION" = "$LATEST_VERSION" ]
+  then
+    echo "Your $APP_NAME is already up to date."
+    echo "You are running $APP_NAME $LOCAL_VERSION"
+  else
+    if version_lt "$LOCAL_VERSION" "$LATEST_VERSION"
+    then
+      echo "There is a new version available."
+      echo "Doing update from $LOCAL_VERSION to $LATEST_VERSION"
+      do_update_procedure
+    fi
+  fi
+}
+
+main "${@}"
+exit $?