Update commafeed.sh

Author: mzhaodev

ct/commafeed.sh

@@ -33,9 +33,12 @@ function update_script() {
     systemctl stop commafeed
     msg_ok "Stopped ${APP}"
 
-    msg_info "Installing Dependencies"
-    $STD apt-get install -y rsync
-    msg_ok "Installed Dependencies"
+    if ! [[ $(dpkg -s rsync 2>/dev/null) ]]; then
+      msg_info "Installing Dependencies"
+      $STD apt-get update
+      $STD apt-get install -y rsync
+      msg_ok "Installed Dependencies"
+    fi
 
     msg_info "Updating ${APP} to ${RELEASE}"
     curl -fsSL "https://github.com/Athou/commafeed/releases/download/${RELEASE}/commafeed-${RELEASE}-h2-jvm.zip" -o $(basename "https://github.com/Athou/commafeed/releases/download/${RELEASE}/commafeed-${RELEASE}-h2-jvm.zip")