nixpkgs/pkgs/os-specific/linux/rfkill/rfkill-hook.sh

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#!@shell@
# Executes a hook in case of a change to the
# rfkill state. The hook can be passed as
# environment variable, or present as executable
# file.
if [ -z "$RFKILL_STATE" ]; then
echo "rfkill-hook: error: RFKILL_STATE variable not set"
exit 1
fi
if [ -x /run/current-system/etc/rfkill.hook ]; then
exec /run/current-system/etc/rfkill.hook
elif [ ! -z "$RFKILL_HOOK" ]; then
exec $RFKILL_HOOK
else
echo "rfkill-hook: $RFKILL_STATE"
fi