updates-fedora: add script

polybar-scripts/updates-fedora/README.md

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+# Script: updates-fedora
+
+A script that shows if there are updates for Fedora or `dnf` based distributions.
+
+![updates-fedora](screenshots/1.png)
+
+
+## Configuration
+
+You may need to add the `dnf` command to the `/etc/sudoers` NOPASSWD of your user:
+
+```
+user ALL=(ALL) NOPASSWD: /usr/bin/dnf
+```
+
+## Module
+
+```ini
+[module/updates-fedora]
+type = custom/script
+exec = ~/polybar-scripts/updates-fedora.sh
+interval = 600
+```

polybar-scripts/updates-fedora/updates-fedora.sh

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+#!/bin/sh
+
+dnf=$(dnf upgrade --refresh --assumeno 2> /dev/null)
+
+upgrade=$(echo "$dnf" | grep '^Upgrade' | awk '{ print $2 }')
+install=$(echo "$dnf" | grep '^Install' | awk '{ print $2 }')
+
+updates=$(( upgrade + install ))
+
+if [ "$updates" -gt 0 ]; then
+    echo "# $updates"
+else
+    echo ""
+fi