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app: Start wpa_supplicant only when Ethernet has no DHCP lease

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Probe the configured Ethernet interface (default eth0, overridable via
-ethernet-interface) at startup. If no DHCP-assigned IPv4 is present,
start the wpa_supplicant service so the WiFi backend has something to
talk to; otherwise leave it alone and rely on the wired uplink.
This commit is contained in:
nemunaire 2026-05-01 22:35:07 +08:00
commit d57c08a6c4
4 changed files with 82 additions and 20 deletions
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internal/config/cli.go
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@ -9,6 +9,7 @@ func declareFlags(o *Config) {
flag.StringVar(&o.Bind, "bind", "127.0.0.1:8080", "Bind address (host:port). Defaults to localhost; set to ':8080' to expose on the LAN — but note: there is no built-in authentication.")
flag.StringVar(&o.WifiInterface, "wifi-interface", "wlan0", "WiFi interface name")
flag.StringVar(&o.HotspotInterface, "hotspot-interface", "wlan1", "Hotspot WiFi interface name")
flag.StringVar(&o.EthernetInterface, "ethernet-interface", "eth0", "Ethernet interface to probe for a DHCP-assigned address at startup; if no DHCP address is present, wpa_supplicant is started")
flag.StringVar(&o.WifiBackend, "wifi-backend", "", "WiFi backend to use: 'iwd' or 'wpasupplicant' (required)")
flag.StringVar(&o.StationBackend, "station-backend", "hostapd", "Station discovery backend: 'arp', 'dhcp', or 'hostapd'")
flag.StringVar(&o.DHCPLeasesPath, "dhcp-leases-path", "/var/lib/dhcp/dhcpd.leases", "Path to DHCP leases file")