[Unit]
Description=Small DNS server to resolve everything to the AP interface.
BindsTo=sys-subsystem-net-devices-ap0.device
After=sys-subsystem-net-devices-ap0.device
Before=network.target
Wants=network.target

# check existence of configuration file
ConditionPathExists= /etc/wpa_supplicant/wpa_supplicant-ap0.conf
ConditionPathExists=!/etc/wpa_supplicant/wpa_supplicant-wlan0.conf

[Service]
ExecStart=/usr/sbin/dnsmasq -k --conf-file=/etc/dnsmasq.conf
ExecReload=/bin/kill -HUP $MAINPID
Restart=on-failure
RestartSec=5

[Install]
WantedBy=sys-subsystem-net-devices-ap0.device