burrow-pi-img/stage2/02-net-tweaks/01-run.sh

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#!/bin/bash -e
install -v -d "${ROOTFS_DIR}/etc/systemd/system/dhcpcd.service.d"
install -v -m 644 files/wait.conf "${ROOTFS_DIR}/etc/systemd/system/dhcpcd.service.d/"
install -v -d "${ROOTFS_DIR}/etc/wpa_supplicant"
install -v -m 600 files/wpa_supplicant.conf "${ROOTFS_DIR}/etc/wpa_supplicant/"
on_chroot << EOF
rm -f /etc/resolv.conf
touch /tmp/dhcpcd.resolv.conf
ln -s /tmp/dhcpcd.resolve.conf /etc/resolv.conf
sed -i -e 's/\/run\//\/var\/run\//' /etc/systemd/system/dhcpcd5.service
mv /etc/dhcpcd.conf /boot/
chown root:root /boot/dhcpcd.conf
ln -s /boot/dhcpcd.conf /etc/dhcpcd.conf
EOF
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