Allow setting up wifi from config

Add WPA_ESSID, WPA_PASSWORD and WPA_COUNTRY options to config.

stage2/02-net-tweaks/01-run.sh

@@ -6,3 +6,14 @@ install -v -m 644 files/wait.conf		"${ROOTFS_DIR}/etc/systemd/system/dhcpcd.serv
 install -v -d					"${ROOTFS_DIR}/etc/wpa_supplicant"
 install -v -m 600 files/wpa_supplicant.conf	"${ROOTFS_DIR}/etc/wpa_supplicant/"
 
+if [ -v WPA_COUNTRY ]
+then
+	echo "country=${WPA_COUNTRY}" >> "${ROOTFS_DIR}/etc/wpa_supplicant/wpa_supplicant.conf"
+fi
+
+if [ -v WPA_ESSID -a -v WPA_PASSWORD ]
+then
+on_chroot <<EOF
+wpa_passphrase ${WPA_ESSID} ${WPA_PASSWORD} >> "/etc/wpa_supplicant/wpa_supplicant.conf"
+EOF
+fi