Add CMake and cross example

Dependencies

• [2] VMUKZQZR Work on 02-nix-build
• [*] 7AUC4NKI Initial commit

Change contents

• file addition: CMakeLists.txt (----------)
  [2.1]
  + cmake_minimum_required(VERSION 3.25)

  +

  + project(wttr-delft VERSION 1.0 LANGUAGES C)

  +

  + find_package(CURL REQUIRED)

  +

  + add_executable(wttr-delft simple.c)

  +

  + target_link_libraries(wttr-delft PRIVATE CURL::libcurl)

  +

  + install(TARGETS wttr-delft RUNTIME DESTINATION bin)
• file addition: 04-cmake-and-cross (d--r------)
  [4.2]
• file addition: wttr-delft.nix (----------)
  [0.311]
  + { stdenv

  + , cmake

  + , curl

  + }:

  + stdenv.mkDerivation rec {

  + # Our package name

  + name = "wttr-delft";

  +

  + # Where the source code lives

  + src = builtins.path { path = ../src; name = name; };

  +

  + # Build-time dependencies

  + nativeBuildInputs = [

  + cmake

  + ];

  +

  + # Dependencies

  + buildInputs = [

  + curl.dev

  + ];

  + }
• file addition: podman-setup-script.nix (----------)
  [0.311]
  + { pkgs }:

  + let

  + registriesConf = pkgs.writeText "registries.conf" ''

  + [registries.search]

  + registries = ['docker.io']

  + [registries.block]

  + registries = []

  + '';

  + storageConf = pkgs.writeText "storage.conf" ''

  + [storage]

  + driver = "overlay"

  + # rootless_storage_path="$XDG_DATA_HOME/containers/storage"

  + '';

  + in pkgs.writeShellScript "podman-setup" ''

  + # Dont overwrite customised configuration

  + if ! test -f ~/.config/containers/policy.json; then

  + echo "Installing missing ~/.config/containers/policy.json"

  + install -Dm644 ${pkgs.skopeo.src}/default-policy.json ~/.config/containers/policy.json

  + fi

  + if ! test -f ~/.config/containers/registries.conf; then

  + echo "Installing missing ~/.config/containers/registries.conf"

  + install -Dm644 ${registriesConf} ~/.config/containers/registries.conf

  + fi

  + if ! test -f ~/.config/containers/storage.conf; then

  + echo "Installing missing ~/.config/containers/storage.conf"

  + install -Dm644 ${storageConf} ~/.config/containers/storage.conf

  + fi

  +

  + if ! grep -q "^''${USER}:" /etc/subuid; then

  + echo "No subuid range defined for user, consider running 'sudo usermod --add-subuids 10000-75535 ''${USER}' to allow rootless podman to work"

  + fi

  + ''
• file addition: flake.nix (----------)
  [0.311]
  + # This is a Nix flake

  + # It is written in the Nix expression language

  + {

  + description = "Simple flake for simple libcurl example";

  +

  + # nixpkgs is the package repository for the Nix package manager

  + inputs = {

  + flake-utils.url = "github:numtide/flake-utils";

  + nixpkgs.url = "github:NixOS/nixpkgs";

  + };

  +

  + outputs = { self, nixpkgs, flake-utils }:

  + flake-utils.lib.eachDefaultSystem (system:

  + let

  + # In this simple example we choose to build for "x86_64-linux" only

  +

  + pkgs = import nixpkgs {

  + inherit system;

  + overlays = [

  + (final: prev: {

  + wttr-delft = prev.callPackage ./wttr-delft.nix {};

  + })

  + ];

  + };

  +

  + # Docker image containing only wttr-delft

  + wttr-delft-container = pkgs.dockerTools.buildLayeredImage {

  + name = "wttr-delft";

  + tag = "nix";

  + # created = "now";

  + contents = [

  + pkgs.wttr-delft

  + ];

  + config = {

  + Cmd = [

  + "${pkgs.wttr-delft}/bin/wttr-delft"

  + ];

  + # Needed for curl to work

  + Env = [

  + "SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"

  + ];

  + };

  + };

  +

  + # Development shell for interacting with containers

  + # Based on https://gist.github.com/adisbladis/187204cb772800489ee3dac4acdd9947

  + podman-devshell = let

  + # Provides a script that copies/creates files that are required for rootless podman

  + podmanSetupScript = import ./podman-setup-script.nix { inherit pkgs; };

  + # Provides a fake "docker" binary mapping to podman

  + dockerCompat = pkgs.runCommandNoCC "docker-podman-compat" {} ''

  + mkdir -p $out/bin

  + ln -s ${pkgs.podman}/bin/podman $out/bin/docker

  + '';

  +

  + in pkgs.mkShell {

  + name = "podman";

  +

  + buildInputs = with pkgs; [

  + podman # Manage pods, containers and images

  + runc # Container runtime

  + conmon # Container runtime monitor

  + skopeo # Interact with container registry

  + slirp4netns # User-mode networking for unprivileged namespaces

  + fuse-overlayfs # CoW for images, much faster than default vfs

  + dockerCompat # Aliases for docker / podman

  + ];

  +

  + shellHook = ''

  + # Install configuration required for rootless podman

  + ${podmanSetupScript}

  + '';

  + };

  + in

  + # These are the flake outputs, i.e. what we can consume

  + {

  + packages = {

  + default = pkgs.wttr-delft;

  + # static = pkgs.pkgsCross.musl64.pkgsStatic.wttr-delft;

  + container = wttr-delft-container;

  + };

  +

  + devShells = {

  + default = pkgs.wttr-delft;

  + podman = podman-devshell;

  + };

  + }

  + );

  + }
• file addition: flake.lock (----------)
  [0.311]
  + {

  + "nodes": {

  + "flake-utils": {

  + "locked": {

  + "lastModified": 1678901627,

  + "narHash": "sha256-U02riOqrKKzwjsxc/400XnElV+UtPUQWpANPlyazjH0=",

  + "owner": "numtide",

  + "repo": "flake-utils",

  + "rev": "93a2b84fc4b70d9e089d029deacc3583435c2ed6",

  + "type": "github"

  + },

  + "original": {

  + "owner": "numtide",

  + "repo": "flake-utils",

  + "type": "github"

  + }

  + },

  + "nixpkgs": {

  + "locked": {

  + "lastModified": 1679396235,

  + "narHash": "sha256-RjmNVFuZQ2e6u35B98JcY9IzVDtZb3d4QcbtfLtNWkE=",

  + "owner": "NixOS",

  + "repo": "nixpkgs",

  + "rev": "008ce261a7e3c532e792cb8e39482f2cc1b192f5",

  + "type": "github"

  + },

  + "original": {

  + "owner": "NixOS",

  + "repo": "nixpkgs",

  + "type": "github"

  + }

  + },

  + "root": {

  + "inputs": {

  + "flake-utils": "flake-utils",

  + "nixpkgs": "nixpkgs"

  + }

  + }

  + },

  + "root": "root",

  + "version": 7

  + }