default.nix

[chessai@chessai-kudu:~/Development/summoner/summoner-cli]$ cat default.nix 
{ compiler ? "ghc863" }:

with rec {
  pkgs = (import ./nix/nixpkgs.nix {
    inherit compiler; 
  });
  drv = pkgs.haskellPackages.summoner-cli;
};

drv

initial_attempt.sh

[chessai@chessai-kudu:~/Development/summoner/summoner-cli]$ nix-shell --show-trace
building '/nix/store/kp8hz8fldkawbxbnz56wnh6qf8944cyr-cabal2nix-summoner-cli.drv'...
installing
error: creating directory '/nix/var': Permission denied
error: creating directory '/nix/var': Permission denied
** need a revision for VCS when the hash is given. skipping.
** need a revision for VCS when the hash is given. skipping.
** need a revision for VCS when the hash is given. skipping.
** need a revision for VCS when the hash is given. skipping.
cabal2nix: user error (Failed to fetch source. Does this source exist? Source {sourceUrl = "/nix/store/dmvyfysd3q1nk2ryqhg5j14zap7dqsn9-summoner-cli", sourceRevision = "", sourceHash = Guess "", sourceCabalDir = ""})
builder for '/nix/store/kp8hz8fldkawbxbnz56wnh6qf8944cyr-cabal2nix-summoner-cli.drv' failed with exit code 1
error: while evaluating anonymous function at /home/chessai/Development/summoner/summoner-cli/default.nix:1:1, called from /home/chessai/Development/summoner/summoner-cli/shell.nix:1:2:
while evaluating the attribute 'haskellPackages.summoner-cli' at /home/chessai/Development/summoner/summoner-cli/nix/overrides.nix:10:3:
while evaluating 'overrideCabal' at /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/lib.nix:37:24, called from /home/chessai/Development/summoner/summoner-cli/nix/overrides.nix:15:5:
while evaluating 'callCabal2nix' at /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/make-package-set.nix:195:32, called from /home/chessai/Development/summoner/summoner-cli/nix/overrides.nix:13:27:
while evaluating 'callCabal2nixWithOptions' at /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/make-package-set.nix:180:66, called from /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/make-package-set.nix:195:38:
while evaluating 'overrideCabal' at /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/lib.nix:37:24, called from /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/make-package-set.nix:191:10:
while evaluating 'callPackageKeepDeriver' at /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/make-package-set.nix:156:33, called from /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/make-package-set.nix:191:25:
while evaluating 'overrideCabal' at /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/lib.nix:37:24, called from /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/make-package-set.nix:157:5:
while evaluating 'callPackage' at /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/make-package-set.nix:114:22, called from /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/make-package-set.nix:157:20:
while evaluating 'callPackageWithScope' at /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/make-package-set.nix:74:37, called from /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/make-package-set.nix:114:28:
while evaluating 'makeOverridable' at /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/lib/customisation.nix:67:24, called from /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/make-package-set.nix:97:8:
while evaluating 'drvScope' at /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/pkgs/development/haskell-modules/make-package-set.nix:87:18, called from /nix/store/sjck5mvcq9ns1y8zpr2m83g8pb31352n-source/lib/customisation.nix:69:12:
build of '/nix/store/kp8hz8fldkawbxbnz56wnh6qf8944cyr-cabal2nix-summoner-cli.drv' failed

nix_show_derivation

[chessai@chessai-kudu:~/Development/summoner/summoner-cli]$ nix show-derivation /nix/store/kp8hz8fldkawbxbnz56wnh6qf8944cyr-cabal2nix-summoner-cli.drv
{
  "/nix/store/kp8hz8fldkawbxbnz56wnh6qf8944cyr-cabal2nix-summoner-cli.drv": {
    "outputs": {
      "out": {
        "path": "/nix/store/vkp30avhdixjamwad0ri6df50jnr6j9q-cabal2nix-summoner-cli"
      }
    },
    "inputSrcs": [
      "/nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh",
      "/nix/store/dmvyfysd3q1nk2ryqhg5j14zap7dqsn9-summoner-cli"
    ],
    "inputDrvs": {
      "/nix/store/549zx7iyxnfd89fwxg2i3prpkmpmb6pz-bash-4.4-p23.drv": [
        "out"
      ],
      "/nix/store/7pi05y6ccjcavr7akv40z3jd9sdymyhx-glibc-locales-2.27.drv": [
        "out"
      ],
      "/nix/store/cfrlcwabgqc86gjvja3pn0h846b3332b-cabal2nix-2.13.drv": [
        "out"
      ],
      "/nix/store/xkmbyn610hfh87xbfl7gahy37x54773i-stdenv-linux.drv": [
        "out"
      ]
    },
    "platform": "x86_64-linux",
    "builder": "/nix/store/gayzik3jx16rpc64czk5cy5s953431s6-bash-4.4-p23/bin/bash",
    "args": [
      "-e",
      "/nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh"
    ],
    "env": {
      "LANG": "en_US.UTF-8",
      "LOCALE_ARCHIVE": "/nix/store/rri394g09abd1p98c8gbda8nia1mi2dv-glibc-locales-2.27/lib/locale/locale-archive",
      "allowSubstitutes": "",
      "buildInputs": "",
      "builder": "/nix/store/gayzik3jx16rpc64czk5cy5s953431s6-bash-4.4-p23/bin/bash",
      "configureFlags": "",
      "depsBuildBuild": "",
      "depsBuildBuildPropagated": "",
      "depsBuildTarget": "",
      "depsBuildTargetPropagated": "",
      "depsHostHost": "",
      "depsHostHostPropagated": "",
      "depsTargetTarget": "",
      "depsTargetTargetPropagated": "",
      "doCheck": "",
      "doInstallCheck": "",
      "installPhase": "export HOME=\"$TMP\"\nmkdir -p \"$out\"\ncabal2nix --compiler=ghc-8.6.3 --system=x86_64-linux --sha256= \"/nix/store/dmvyfysd3q1nk2ryqhg5j14zap7dqsn9-summoner-cli\"  > \"$out/default.nix\"\n",
      "name": "cabal2nix-summoner-cli",
      "nativeBuildInputs": "/nix/store/00h686pqic1i3cbqfii729c7vah3skj4-cabal2nix-2.13",
      "out": "/nix/store/vkp30avhdixjamwad0ri6df50jnr6j9q-cabal2nix-summoner-cli",
      "outputs": "out",
      "phases": "installPhase",
      "preferLocalBuild": "1",
      "propagatedBuildInputs": "",
      "propagatedNativeBuildInputs": "",
      "stdenv": "/nix/store/hgmpv3ks5nchl0hcgqp1f8x372ya2vms-stdenv-linux",
      "strictDeps": "",
      "system": "x86_64-linux"
    }
  }
}

nix_Slash_nixpkgs.nix

[chessai@chessai-kudu:~/Development/summoner/summoner-cli]$ cat nix/nixpkgs.nix 
{ compiler ? "ghc863" }:

with rec {
  fetchNixpkgs = import ./fetchNixpkgs.nix;
  nixpkgs = fetchNixpkgs {
    owner  = "NixOS";
    repo   = "nixpkgs";
    rev    = "cecec1f74468766825c2ad32d8388c2ded36225f";
    sha256 = "1sq538wy0shbakah27b6n4bl5amzwkzjsds77vdd8rsq0d1nys4w";
  };
};

import nixpkgs {
  config = {
    packageOverrides = super: let self = super.pkgs; in {
      haskellPackages = super.haskell.packages.${compiler}.override {
        overrides = import ./overrides.nix { pkgs = self; };
      };
    };
  };
  overlays = [ ];
}

nix_Slash_overrides.nix

[chessai@chessai-kudu:~/Development/summoner/summoner-cli]$ cat nix/overrides.nix 
{ pkgs }:

self: super:

with { inherit (pkgs.stdenv) lib; };

with pkgs.haskell.lib;

{
  summoner-cli = (
    with rec {
      summoner-cliSource = pkgs.lib.cleanSource ../.;
      summoner-cliBasic = self.callPackage ./summoner-cli.nix {}; # self.callCabal2nix "summoner-cli" summoner-cliSource {};
    };
    overrideCabal summoner-cliBasic (old: {
    })
  );
}

summoner-cli.nix

[chessai@chessai-kudu:~/Development/summoner/summoner-cli]$ cat nix/summoner-cli.nix 
{ mkDerivation, aeson, ansi-terminal, base, base-noprelude
, bytestring, directory, filepath, generic-deriving, gitrev
, hedgehog, hspec, neat-interpolation, optparse-applicative
, process, relude, stdenv, text, time, tomland
}:
mkDerivation {
  pname = "summoner";
  version = "1.2.0";
  src = ./.;
  isLibrary = true;
  isExecutable = true;
  libraryHaskellDepends = [
    aeson ansi-terminal base-noprelude bytestring directory filepath
    generic-deriving gitrev neat-interpolation optparse-applicative
    process relude text time tomland
  ];
  executableHaskellDepends = [ base ];
  testHaskellDepends = [
    base-noprelude filepath hedgehog hspec neat-interpolation relude
    tomland
  ];
  homepage = "https://github.com/kowainik/summoner";
  description = "Tool for scaffolding completely configured production Haskell projects";
  license = stdenv.lib.licenses.mpl20;
}

tree_output.sh

[chessai@chessai-kudu:~/Development/summoner/summoner-cli]$ tree
.
├── app
│   └── Cli.hs
├── CHANGELOG.md
├── default.nix
├── dist
├── LICENSE -> ../LICENSE
├── nix
│   ├── fetchNixpkgs.nix
│   ├── nixpkgs.nix
│   ├── overrides.nix
│   ├── refined.nix
│   └── summoner-cli.nix
├── README.md -> ../README.md
├── release.nix
├── shell.nix
├── src
│   ├── Prelude.hs
│   ├── Summoner
│   │   ├── Ansi.hs
│   │   ├── CLI.hs
│   │   ├── Config.hs
│   │   ├── Decision.hs
│   │   ├── Default.hs
│   │   ├── GhcVer.hs
│   │   ├── License.hs
│   │   ├── Process.hs
│   │   ├── Project.hs
│   │   ├── Question.hs
│   │   ├── Settings.hs
│   │   ├── Source.hs
│   │   ├── Template
│   │   │   ├── Cabal.hs
│   │   │   ├── Doc.hs
│   │   │   ├── GitHub.hs
│   │   │   ├── Haskell.hs
│   │   │   ├── Nix.hs
│   │   │   └── Stack.hs
│   │   ├── Template.hs
│   │   ├── Text.hs
│   │   └── Tree.hs
│   └── Summoner.hs
├── summoner.cabal
└── test
    ├── golden
    │   ├── fullProject
    │   │   ├── app
    │   │   │   └── Main.hs
    │   │   ├── appveyor.yml
    │   │   ├── benchmark
    │   │   │   └── Main.hs
    │   │   ├── CHANGELOG.md
    │   │   ├── CONTRIBUTING.md
    │   │   ├── fullProject.cabal
    │   │   ├── LICENSE
    │   │   ├── README.md
    │   │   ├── src
    │   │   │   ├── FullProject.hs
    │   │   │   └── Prelude.hs
    │   │   ├── stack-8.0.2.yaml
    │   │   ├── stack-8.2.2.yaml
    │   │   ├── stack-8.4.4.yaml
    │   │   ├── stack.yaml
    │   │   └── test
    │   │       └── Spec.hs
    │   └── smallProject
    │       ├── app
    │       │   └── Main.hs
    │       ├── CHANGELOG.md
    │       ├── README.md
    │       └── smallProject.cabal
    ├── Prelude.hs
    ├── Spec.hs
    └── Test
        ├── DecisionSpec.hs
        ├── Golden.hs
        ├── QuestionSpec.hs
        └── TomlSpec.hs