dotfiles/sh/.local/bin/check-internet

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#!/usr/bin/env sh
#
# Check for internet connectivity.
# Returns 0 if connectivity exists, 1 if it does not.
hasconnec=0
for intf in /sys/class/net/*; do
case $intf in
"/sys/class/net/lo") break ;;
*)
[ "$(cat "$intf/carrier")" = 1 ] && hasconnec=1
;;
esac
done
if [ $hasconnec -ne 1 ]; then
ping -q -w 1 -c 1 8.8.8.8 >/dev/null 2>&1 && hasconnec=1
fi
if [ $hasconnec -eq 1 ]; then
exit 0
else
exit 1
fi