Download the checkupdates.sh script, put it in $HOME/.config/waybar/scripts/checkupdates.sh.
To configure, add the following to your Waybar config ($HOME/.config/waybar/config).
"custom/updates": {
"exec": "bash $HOME/.config/waybar/scripts/checkupdates.sh", // <--- path to script
"on-click-right": "bash $HOME/.config/waybar/scripts/checkupdates.sh", // refresh on right click
"on-click-middle": "swaymsg exec '$term -e sudo dnf update'", // update on middle click
"interval": 900, // refresh every 15 minutes
"return-type": "json",
"format": "{icon}",
"format-alt": "{icon} {}",
"format-icons": {
"has-updates": "", // icon when updates needed
"updated": "" // icon when all packages updated
}
},To style use the #custom-updates ID in your Waybar styles file (~/.config/waybar/styles.css).
For more information see the Waybar wiki.