wifi_keyimport.sh

#!/bin/bash
# Setup Credentials for WIFI
# Place this script to /userdata/system/scripts
# Add call to script to /userdata/system/custom.sh to autostart
#
# To import keyfile place wifikeyfile.txt to /boot (this is visible FAT32 ext. in Windows)
# To import keyfile activate WiFi in EmulationStation and reboot
#
# by cyperghost 2019/06/13

readonly BATOCERA_CONFIGFILE="/userdata/system/batocera.conf"
readonly WIFI_KEYFILE="/boot/wifikeyfile.txt"
readonly COMMENT_CHAR="#"

function get_config() {
     local val
     val=$(grep -E -m1 ^$COMMENT_CHAR?$1 $BATOCERA_CONFIGFILE) 
     [[ "${val:0:1}" == "$COMMENT_CHAR" ]] && rem_config "$1"
     val="${val//$1=/}"
     echo "$val"
}

function set_config() {
     sed -i "s|^\(\s*$1\s*=\).*|\1$2|" "$BATOCERA_CONFIGFILE"
}

function rem_config() {
     sed -i "s|^$COMMENT_CHAR\(\s*$1\)|\1|" "$BATOCERA_CONFIGFILE"
}

[[ -e "$WIFI_KEYFILE" ]] || exit                              #If no file present then exit
[[ "$(get_config wifi.enabled)" -eq 1 ]] || exit              #If WiFi is disabled then exit 

while read line; do
    if [[ "$line" =~ "psk=\"" ]]; then
        psk="${line#*\"}"
        psk="${psk%\"*}"
        val=$(get_config wifi2.key)
        [[ "$psk" == "$val" || -z "$val" ]] && psk=           #If Passkey already setted then clear psk var
    elif [[ "$line" =~ "ssid=\"" ]]; then
        ssid="${line#*\"}"
        ssid="${ssid%\"*}" 
        val=$(get_config wifi2.ssid)
        [[ "$ssid" == "$val" || -z "$val"  ]] && ssid=         #If SSID is setted then clear ssid var
    fi
done < <(tr -d '\r' < "$WIFI_KEYFILE")

[[ -z $psk ]] || set_config wifi2.key "$psk"     # If PSK is empty then key stored is equal to keyfile setted one
[[ -z $ssid ]] || set_config wifi2.ssid "$ssid"  # If SSID is empty then key stored in Keyfile is equal