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#!/bin/sh
 
set -e
 
if [[ $# -ne 3 ]] ; then
   echo "Usage: $0 </dev/disk> <ssid> <passphrase>"
   exit 1
fi
 
DISK="$1"
SSID="$2"
PASS="$3"
 
if [[ ! -b "${DISK}" ]] ; then
   echo "Not a block device: ${DISK}"
   exit 1
fi
 
if [[ "${USER}" != "root" ]] ; then
   echo "Must run as root."
   exit 1
fi
 
echo Mounting
mkdir root
mount "${DISK}2" root
 
cat << EOF >> root/etc/systemd/network/wlan0.network
[Match]
Name=wlan0
 
[Network]
DHCP=yes
EOF
 
wpa_passphrase "${SSID}" "${PASS}" > root/etc/wpa_supplicant/wpa_supplicant-wlan0.conf
 
ln -s \
   /usr/lib/systemd/system/wpa_supplicant@.service \
   root/etc/systemd/system/multi-user.target.wants/wpa_supplicant@wlan0.service
 
echo Unmounting
umount root
 
echo Cleaning up
rmdir root