Remove default search engines from Opera (Ubuntu)

remove-default-search-engine-opera.sh

#!/usr/bin/env bash

ERROR_REMOVING_OPERA_SEARCH_ENGINE="Error while removing Opera (Linux) default search engine.";
OPERA_CONFIG_FOLDER="${HOME}/.config/opera";
OPERA_INSTALLATION_FOLDER="/usr/lib/x86_64-linux-gnu/opera";
BACKUP_PARTNER_JSON=true;

init()
{
    if [[ ${EUID} -ne 0 ]]; then
        LOG "You must be root";
        exit 1;
    fi
}

main()
{
    default_partner_json_filename="default_partner_content.json";
    default_partner_json_location="${OPERA_CONFIG_FOLDER}/${default_partner_json_filename}";
    site_prefs_json_filename="siteprefs.json";
    site_prefs_json_location="${OPERA_CONFIG_FOLDER}/${site_prefs_json_filename}";

    if [[ BACKUP_PARTNER_JSON -eq true ]]; then
        mv ${default_partner_json_location} ${default_partner_json_location}.backup;
    fi

    cp ${site_prefs_json_location} ${default_partner_json_location};
    chmod 0444 ${default_partner_json_location}
    cp ${default_partner_json_location} "${OPERA_INSTALLATION_FOLDER}/resources/${default_partner_json_filename}";
    cp ${site_prefs_json_location} "${OPERA_INSTALLATION_FOLDER}/resources/${site_prefs_json_filename}";
}

exit_program()
{
    exit;
}

LOG()
{
    PATH=$0;
    MESSAGE=$1;

    echo "[!]" ${MESSAGE};
}

( init && main && exit_program ) || ( LOG ${ERROR_REMOVING_OPERA_SEARCH_ENGINE} );