add first draft

.gitignore

@@ -1 +1,3 @@
 result*
+.buildroot
+build

buildroot.nix

@@ -0,0 +1,84 @@
+# nix-build  --expr 'with import <nixpkgs> {}; callPackage ./buildroot.nix {}'
+{
+  pkgs ? import <nixpkgs> {},
+  packagName ? "buildroot",
+  packageVersion ? "2021.02.7",
+  packageSha256 ? "0kdkar2pbd9k0q4i4a87xnqmsdr7njj6mc8x2avvhh9skw2qrg64",
+  outputFolder ? "$PWD/.buildroot",
+  withXConfig ? false,
+  withGConfig ? false,
+}:
+
+let
+
+
+buildRootPath = "usr/src/${packagName}-${packageVersion}";
+package = pkgs.stdenv.mkDerivation rec {
+  name = "${packagName}";
+  version = "${packageVersion}";
+  src = pkgs.fetchzip {
+    url = "https://buildroot.org/downloads/buildroot-${packageVersion}.tar.gz";
+    sha256 = "${packageSha256}";
+  };
+  phases = [ "unpackPhase" "installPhase" ];
+  installPhase = ''
+    mkdir -p $out/${buildRootPath}
+    cp -R . $out/${buildRootPath}
+  '';
+};
+
+
+makeBuildRoot = pkgs.writeShellScriptBin "makeBuildRoot" ''
+  BR2_DL_DIR="${outputFolder}/dl" ${pkgs.gnumake}/bin/make O="${outputFolder}" -C "${package}/${buildRootPath}" $@
+'';
+
+makeBuildRootScriptPaths = [ pkgs.gnumake];
+
+qtPaths = if withXConfig then [pkgs.qt5.base] else [];
+gtkPaths = if withGConfig then [
+  pkgs.gtk2.dev 
+  pkgs.gtkmm2
+  pkgs.gnome2.libglade
+  pkgs.glib
+  ] else [];
+in 
+{
+    package = package;
+    makeBuildRoot = {
+      command = makeBuildRoot;
+      scriptPaths = makeBuildRootScriptPaths;
+      paths = makeBuildRootScriptPaths ++ [
+        pkgs.which
+        pkgs.pkg-config
+        pkgs.ncurses.dev
+        pkgs.rsync
+        pkgs.bc
+        pkgs.unzip
+        pkgs.cpio
+        pkgs.wget
+        pkgs.git
+        pkgs.subversion
+        pkgs.gnused
+        pkgs.file
+        pkgs.perl
+        pkgs.flock
+        pkgs.bash
+        pkgs.gnugrep
+        pkgs.coreutils-full
+        pkgs.binutils
+        pkgs.gcc
+        pkgs.gnupatch
+        pkgs.gzip
+        pkgs.bzip2
+        pkgs.gnutar
+        pkgs.cacert
+        pkgs.python3Full
+        pkgs.lzma
+        pkgs.gdbm
+        pkgs.readline
+
+      ] 
+      ++ qtPaths
+      ++ gtkPaths;
+    };
+}

examples/buildroot_nix-build.nix

@@ -0,0 +1,17 @@
+{ pkgs ? import <nixpkgs> {}}:
+let
+
+buildroot = pkgs.callPackage ../buildroot.nix {};
+
+in
+
+pkgs.stdenv.mkDerivation rec {
+  name = "makeBuildRoot";
+  phases = "installPhase";
+  installPhase = ''
+    mkdir -p $out/bin
+    cp ${buildroot.makeBuildRoot.command}/bin/makeBuildRoot $out/bin/makeBuildRoot
+  '';
+}
+
+

examples/buildroot_nix-docker.nix

@@ -0,0 +1,30 @@
+{ pkgs ? import <nixpkgs> {}}:
+let
+
+buildroot = pkgs.callPackage ../buildroot.nix {};
+
+buildrootBaseImage = pkgs.dockerTools.pullImage {
+  imageName = "buildroot/base";
+  imageDigest = "sha256:d81f16ae5635f1548fe3a9dafef5f41932fa5a209368cb7d74fa9a8dea2b2b07";
+  finalImageName = "buildroot/base";
+  finalImageTag = "20210922.2200";
+  sha256 = "0mqjy3zq2v6rrhizgb9nvhczl87lcfphq9601wcprdika2jz7qh8";
+};
+
+in
+
+pkgs.dockerTools.buildImage {
+  name = "buildroot-nix";
+  tag = "latest";
+
+  fromImage = buildrootBaseImage;
+
+  contents = [
+      buildroot.package
+      buildroot.makeBuildRoot.command
+      buildroot.makeBuildRoot.scriptPaths     
+  ];
+ 
+  config.Cmd = [ "${pkgs.bash}/bin/bash" ];
+}
+

examples/buildroot_nix-shell.nix

@@ -0,0 +1,25 @@
+{ pkgs ? import <nixpkgs> {}}:
+let
+
+buildroot = pkgs.callPackage ../buildroot.nix {};
+
+in
+
+pkgs.stdenv.mkDerivation {
+  name = "buildroot-shell";
+    buildInputs = buildroot.makeBuildRoot.paths ++ [
+      buildroot.package
+      buildroot.makeBuildRoot.command
+    ];
+  hardeningDisable = [ "all" ];
+  shellHook = ''
+        alias make='makeBuildRoot'
+  ''; 
+  phases = [ "nobuildPhase" ];
+  nobuildPhase = ''
+    echo
+    echo "This derivation is not meant to be built, aborting";
+    echo
+    exit 1
+  '';  
+}