safelyconfigctl

#!/bin/bash

if [ -z "$kernel_source_dir" ] || [ -z "$target_config" ] || [ -z "$support_config_file" ]; then
    echo "Error: Environment variables kernel_source_dir, target_config or support_config_file are not set."
    exit 1
fi

if [ "$#" -ne 2 ]; then
    echo "Usage: $0 [-e|-d] CONFIG_OPTION"
    exit 1
fi

action=$1
config_option=$2

if [[ ! $config_option == CONFIG_* ]]; then
    config_option_with_prefix="CONFIG_$config_option"
else
    config_option_with_prefix=$config_option
    config_option=${config_option#CONFIG_}
fi

case $action in
    -e)
        if grep -qE "^(CONFIG_)?$config_option=" "$support_config_file"; then
            "$kernel_source_dir/scripts/config" --file "$target_config" -e "$config_option_with_prefix"
        else
            echo "Error: $config_option or $config_option_with_prefix is not supported."
            if [ -z "$IGNORE_ERRORS" ]; then
                exit 1
            fi
        fi
        ;;
    -d)
        "$kernel_source_dir/scripts/config" --file "$target_config" -d "$config_option_with_prefix"
        ;;
    *)
        echo "Error: Invalid action. Use -e to enable or -d to disable a config option."
        exit 1
        ;;
esac

exit 0