hello-c from NixOS/templates

https://github.com/NixOS/templates/blob/master/c-hello
This commit is contained in:
Greg Burd 2023-09-12 10:09:05 -04:00
commit 0caf5b2378
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4 changed files with 139 additions and 0 deletions

13
Makefile.in Normal file
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prefix = @prefix@
exec_prefix = @exec_prefix@
bindir = @bindir@
hello: hello.c
$(CC) -Wall -O3 -o hello hello.c
clean:
rm -f hello
install: hello
install -d $(bindir)
install -t $(bindir) hello

4
configure.ac Normal file
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AC_INIT([Hello], 1.0)
AC_PROG_CC
AC_CONFIG_FILES(Makefile)
AC_OUTPUT

116
flake.nix Normal file
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{
description = "An over-engineered Hello World in C";
# Nixpkgs / NixOS version to use.
inputs.nixpkgs.url = "nixpkgs/nixos-21.05";
outputs = { self, nixpkgs }:
let
# to work with older version of flakes
lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
# Generate a user-friendly version number.
version = builtins.substring 0 8 lastModifiedDate;
# System types to support.
supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
# Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
# Nixpkgs instantiated for supported system types.
nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; overlays = [ self.overlay ]; });
in
{
# A Nixpkgs overlay.
overlay = final: prev: {
hello = with final; stdenv.mkDerivation rec {
pname = "hello";
inherit version;
src = ./.;
nativeBuildInputs = [ autoreconfHook ];
};
};
# Provide some binary packages for selected system types.
packages = forAllSystems (system:
{
inherit (nixpkgsFor.${system}) hello;
});
# The default package for 'nix build'. This makes sense if the
# flake provides only one package or there is a clear "main"
# package.
defaultPackage = forAllSystems (system: self.packages.${system}.hello);
# A NixOS module, if applicable (e.g. if the package provides a system service).
nixosModules.hello =
{ pkgs, ... }:
{
nixpkgs.overlays = [ self.overlay ];
environment.systemPackages = [ pkgs.hello ];
#systemd.services = { ... };
};
# Tests run by 'nix flake check' and by Hydra.
checks = forAllSystems
(system:
with nixpkgsFor.${system};
{
inherit (self.packages.${system}) hello;
# Additional tests, if applicable.
test = stdenv.mkDerivation {
pname = "hello-test";
inherit version;
buildInputs = [ hello ];
dontUnpack = true;
buildPhase = ''
echo 'running some integration tests'
[[ $(hello) = 'Hello Nixers!' ]]
'';
installPhase = "mkdir -p $out";
};
}
// lib.optionalAttrs stdenv.isLinux {
# A VM test of the NixOS module.
vmTest =
with import (nixpkgs + "/nixos/lib/testing-python.nix") {
inherit system;
};
makeTest {
nodes = {
client = { ... }: {
imports = [ self.nixosModules.hello ];
};
};
testScript =
''
start_all()
client.wait_for_unit("multi-user.target")
client.succeed("hello")
'';
};
}
);
};
}

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hello.c Normal file
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#include "stdio.h"
int main(int argc, char * * argv)
{
printf("Hello Nixers!\n");
}