Raspberry Pi 3 CentOS wifi setup

wifi-setup-c7-rpi3.sh

#!/bin/bash

#
# Raspberry Pi3 - CentOS 7 - Wi-Fi configuration
#

# Usage: ./wifi-setup.sh 
# you will be prompted for PSK and SSID input

# alternatively: create a file named 'vars' containing two lines:
# export SSID="your ssid"
# export PSK="your psk"

# source variables from vars file if available
if [ -f vars ]; then
    echo "Sourcing SSID and PSK from vars file";
    source vars
    echo "Removing vars file";
    rm -f vars
fi

# confirm we have SSID and PSK
if [ -z "$SSID" ]; then
    echo "Enter WAP SSID:";
    read SSID;
fi

if [ -z "$PSK" ]; then
    echo "Enter WAP PSK:";
    read PSK;
fi

# install firmware for wifi
echo "Installing Wi-Fi firmware";

curl --location https://github.com/RPi-Distro/firmware-nonfree/raw/54bab3d6a6d43239c71d26464e6e10e5067ffea7/brcm80211/brcm/brcmfmac43430-sdio.bin > /usr/lib/firmware/brcm/brcmfmac43430-sdio.bin

curl --location https://github.com/RPi-Distro/firmware-nonfree/raw/54bab3d6a6d43239c71d26464e6e10e5067ffea7/brcm80211/brcm/brcmfmac43430-sdio.txt > /usr/lib/firmware/brcm/brcmfmac43430-sdio.txt

#restore selinux context for firmware
echo "Restoring selinux context for firmware";
restorecon -Frv  /usr/lib/firmware/brcm/

#stop network manager
echo "Stopping and disabling NetworkManager";
systemctl stop NetworkManager
systemctl disable NetworkManager

#enable network
echo "Enabling network";
systemctl enable network

#configure wpa_supplicant
echo "Configuring wpa_supplicant";
echo 'INTERFACES="-i wlan0"
DRIVERS="-D wext"
OTHER_ARGS="-u -f /var/log/wpa_supplicant.log -P /var/run/wpa_supplicant.pid"' > /etc/sysconfig/wpa_supplicant;

#configure wlan0 device
echo "Configuring ifcfg-wlan0";
echo 'BOOTPROTO=dhcp
DEFROUTE=yes
DEVICE=wlan0
KEY_MGMT=WPA-PSK
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
KEY_MGMT=WPA-PSK
NAME=wlan0
ONBOOT=yes
PEERDNS=yes
PEERROUTES=yes
TYPE=Wireless
USERCTL=yes
WPA_ALLOW_WPA=yes
WPA_ALLOW_WPA2=yes
ZONE=trusted
NM_CONTROLLED="no"' > /etc/sysconfig/network-scripts/ifcfg-wlan0

#disable NetworManager control of eth0
echo "Disabling NetworkManager control of eth0 interface";
sed -ri 's/^(NM_CONTROLLED=)yes$/\1no/g' /etc/sysconfig/network-scripts/ifcfg-eth0 

#add eth0 HWADDR
echo "Adding HWADDR parameter for eth0 interface";
addr=`cat /sys/class/net/eth0/address`
echo "HWADDR=$addr" >> /etc/sysconfig/network-scripts/ifcfg-eth0

#restore selinux context to network-scripts
echo "Restoring selinux context for network-scripts";
restorecon -Frv /etc/sysconfig/network-scripts

#configure your wireless access point
echo "Setting up your wireless network";
wpa_passphrase $SSID $PSK >> /etc/wpa_supplicant/wpa_supplicant.conf

#remove plain text PSK from wpa_supplicant.conf
sed -i '/#psk/d' /etc/wpa_supplicant/wpa_supplicant.conf

# to prevent an error later on
touch /etc/sysconfig/network

# ensure wpa_supplicant is enabled
echo "Enabling wpa_supplicant";
systemctl enable wpa_supplicant

# adding rc.local execute permission
chmod +x /etc/rc.d/rc.local

# make final setup script run on next boot
echo "Setting up final wifi-setup script";
echo "/root/wifi-setup-final.sh" >> /etc/rc.local

echo '#!/bin/bash

#
# Final steps to complete wi-fi setup
#

#add wlan0 HWADDR
addr=`cat /sys/class/net/wlan0/address`
echo "HWADDR=$addr" >> /etc/sysconfig/network-scripts/ifcfg-wlan0

#reset /etc/rc.local to orignal state
echo "#!/bin/bash

touch /var/lock/subsys/local
dhclient wlan0" > /etc/rc.d/rc.local

# cleanup
rm -f /root/wifi-setup*

# final reboot
reboot
' > /root/wifi-setup-final.sh

# make final setup script executable
chmod +x /root/wifi-setup-final.sh;

echo "Initial steps complete, rebooting shortly";

sleep 3;

reboot