OpenWRT: Difference between revisions

Revision as of 20:45, 31 January 2022

is an open-source project for embedded operating systems based on Linux, primarily used on embedded devices to route network traffic. The main components are Linux, util-linux, musl, and BusyBox. All components have been optimized to be small enough to fit into the limited storage and memory available in home routers. (Source: https://en.wikipedia.org/wiki/OpenWrt)

OpenWRT provides different possibilities (https://openwrt.org/docs/guide-developer/imagebuilder_frontends) to build custom images for your devices. There is also a little helper tool suggested on IRC called "autobuild" (https://johannes.truschnigg.info/code/openwrt_autobuild/) which helps to manage/keep track of image-configurations for your devices. It's also working with the nix-shell below - please note that there is currently some misbehavior when "make_clean" is set to "True" the system says build is triggered but there are no files/logs/processes running then.

Using ImageBuilder in nix-shell

Get a copy of: https://github.com/nix-community/nix-environments/blob/master/envs/openwrt/shell.nix

Currently (01/2022) I've tested builds using nixpkgs-21.11 and unstable, and both worked. This could possibly break/behave different in the future so you can e.g. pin to an older nixpkgs-revision by replacing the first lines of the above code with this:

{ opkgs ? import <nixpkgs> {} }:                           
                                                           
let                                                        
  pkgs = import (opkgs.fetchFromGitHub {                   
    owner = "NixOS";
    repo = "nixpkgs";            
    rev = "<revision>";      
    sha256 = "<hash>";                                                   
  }) {};
...

@@ Line 4: / Line 4: @@
 == Using ImageBuilder in nix-shell ==
-<syntaxHighlight lang=nix>
+Get a copy of: https://github.com/nix-community/nix-environments/blob/master/envs/openwrt/shell.nix
-{ pkgs ? import <nixpkgs> {} }:
-let
-  fixWrapper = pkgs.runCommand "fix-wrapper" {} ''
-    mkdir -p $out/bin
-    for i in ${pkgs.gcc.cc}/bin/*-gnu-gcc*; do
-      ln -s ${pkgs.gcc}/bin/gcc $out/bin/$(basename "$i")
-    done
-    for i in ${pkgs.gcc.cc}/bin/*-gnu-{g++,c++}*; do
-      ln -s ${pkgs.gcc}/bin/g++ $out/bin/$(basename "$i")
-    done
-  '';
-  fhs = pkgs.buildFHSUserEnv {
-    name = "openwrt-env";
-    targetPkgs = pkgs: with pkgs;
-      [ git
-        perl
-        gnumake
-        gcc
-        unzip
-        utillinux
-        python3
-        patch
-        wget
-        file
-        subversion
-        which
-        pkgconfig
-        openssl
-        fixWrapper
-        systemd
-        binutils
-        ncurses
-        zlib
-        zlib.static
-        glibc.static
-      ];
-    multiPkgs = null;
-    extraOutputsToInstall = [ "dev" ];
-    profile = ''
-      export hardeningDisable=all
-    '';
-  };
-in fhs.env
-</syntaxHighlight>
-Source: https://gist.github.com/Mic92/b59054188c595e5652cacf50485583e0 (Updated python to python3 because build of image failed without)
 Currently (01/2022) I've tested builds using nixpkgs-21.11 and unstable, and both worked. This could possibly break/behave different in the future so you can e.g. pin to an older nixpkgs-revision by replacing the first lines of the above code with this: