Update prometheus.sh

Create update path

ct/prometheus.sh

@@ -55,7 +55,30 @@ function default_settings() {
 function update_script() {
 header_info
 if [[ ! -f /etc/systemd/system/prometheus.service ]]; then msg_error "No ${APP} Installation Found!"; exit; fi
-msg_error "There is currently no update path available."
+RELEASE=$(curl -s https://api.github.com/repos/prometheus/prometheus/releases/latest | grep "tag_name" | awk '{print substr($2, 3, length($2)-4) }')
+if [[ ! -f /opt/${APP}_version.txt ]] || [[ "${RELEASE}" != "$(cat /opt/${APP}_version.txt)" ]]; then
+  msg_info "Stopping ${APP}"
+  systemctl stop prometheus
+  msg_ok "Stopped ${APP}"
+  
+  msg_info "Updating ${APP} to ${RELEASE}"
+  wget -q https://github.com/prometheus/prometheus/releases/download/v${RELEASE}/prometheus-${RELEASE}.linux-amd64.tar.gz
+  tar -xf prometheus-${RELEASE}.linux-amd64.tar.gz
+  cd prometheus-${RELEASE}.linux-amd64
+  cp -rf prometheus promtool /usr/local/bin/
+  cp -rf consoles/ console_libraries/ /etc/prometheus/
+  cd ~
+  rm -rf prometheus-${RELEASE}.linux-amd64 prometheus-${RELEASE}.linux-amd64.tar.gz
+  echo "${RELEASE}" >/opt/${APP}_version.txt
+  msg_ok "Updated ${APP} to ${RELEASE}"
+
+  msg_info "Starting ${APP}"
+  systemctl start prometheus
+  msg_ok "Started ${APP}"
+  msg_ok "Updated Successfully"
+else
+  msg_ok "No update required. ${APP} is already at ${RELEASE}"
+fi
 exit
 }