Initial commit

hello-world-callpackage/build.nix

@@ -0,0 +1,20 @@
+{
+  lib,
+  stdenv,
+  fetchzip,
+  version,
+  hash,
+}:
+stdenv.mkDerivation {
+  pname = "hello";
+  version = "${version}";
+  src = fetchzip {
+    url = "https://ftp.gnu.org/gnu/hello/hello-${version}.tar.gz";
+    hash = "${hash}";
+  };
+  installPhase = ''
+    ./hello --version
+    mkdir -p $out/bin
+    cp hello $out/bin/hello
+  '';
+}

hello-world-callpackage/default.nix

@@ -0,0 +1,10 @@
+{ pkgs ? import <nixpkgs> {} }:
+let
+  commonBuild = import ./build.nix;
+  callPackageForVersion = { version, hash }: pkgs.callPackage commonBuild { version = version; hash = hash; };
+in
+{
+  p0 = callPackageForVersion { version = "2.11"; hash = "sha256-1nXiB0vMCmMYmikTopb/j5WKFwHkc7xoLOqL9/bDFak="; };
+  p1 = callPackageForVersion { version = "2.12"; hash = "sha256-4GQeKLIxoWfYiOraJub5RsHNVQBr2H+3bfPP22PegdU="; };
+  p2 = callPackageForVersion { version = "2.12.1"; hash = "sha256-1kJjhtlsAkpNB7f6tZEs+dbKd8z7KoNHyDHEJ0tmhnc="; };
+}