nom-kconfig 0.6.0

Kconfig is a language that describes configuration options for the Linux Kernel. The syntax looks like this:

# https://github.com/torvalds/linux/blob/master/arch/riscv/Kconfig#L771
config EFI
	bool "UEFI runtime support"
	depends on MMU
	default y
	select EFI_STUB
	help
	  This option provides support for runtime services provided
	  by UEFI firmware.

The file starts with a config entry: We define a config named EFI. The next lines are the attributes of this entry.
EFI is a boolean config.
EFI depends on the config MMU.
Its default value is y.
If EFI is equals to true then it enables EFI_STUB.
The help attribute defines a help text for the end user.

There are plenty of other keywords in the Kconfig language, check out the official documentation for more details.

Features

This is a parser, there is no semantic analysis in this library.
This library only supports UTF-8 encoded files.
List of supported entries can be found here.
List of supported attributes can be found here.
When source is met, it reads and parses the specified configuration file.
This library uses clone() a lot. Do not expect amazing performances.
This parser has been tested on the Linux kernel repository from 2.6.11 to 6.4.9 (3733 versions).

Getting started

cargo add nom-kconfig

use std::path::PathBuf;
use nom_kconfig::{parse_kconfig, KconfigInput, KconfigFile};
use std::collections::HashMap;

// curl https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.4.9.tar.xz | tar -xJ -C /tmp/
fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut variables = HashMap::new();
    variables.insert("SRCARCH", "x86");
    let kconfig_file = KconfigFile::new_with_vars(
        PathBuf::from("/tmp/linux-6.4.9"), 
        PathBuf::from("/tmp/linux-6.4.9/Kconfig"),
        &variables
    );
    let input = kconfig_file.read_to_string()?;
    let kconfig = parse_kconfig(KconfigInput::new_extra(&input, kconfig_file));
    println!("{:?}", kconfig);
    Ok(())
}

nom-kconfig 0.6.0

Getting started

Resources