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snack.nix: allow more overrides
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54
README.md
54
README.md
@ -67,6 +67,12 @@ _See the [Hacking](#hacking) section if you want to hack on snack_
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Assuming that [Nix][nix] is installed on your machine, clone this repo
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and run:
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``` shell
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$ ./script/install
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```
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which is equivalent to
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``` shell
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$ nix-env -f ./default.nix -iA snack-exe
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```
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@ -75,8 +81,8 @@ The _snack_ executable is now in your `PATH`:
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``` shell
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$ snack --help
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Usage: snack [-l|--lib DIR] [-j|--cores INT] ([-s|--package-nix PATH] |
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[-p|--package-yaml PATH]) COMMAND
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Usage: snack [-l|--lib DIR] [-b|--snack-nix PATH] [-j|--cores INT]
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([-s|--package-nix PATH] | [-p|--package-yaml PATH]) COMMAND
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Available options:
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-l,--lib DIR Path to the directory to use as the Nix library
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@ -221,8 +227,50 @@ $ snack run # looks for a file called package.nix by default
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Alternatively, use `$ snack build` or `$ snack ghci` if you only want to build,
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or fire up `ghci`, respectively.
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### Advanced Nix Example
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### Using other versions of GHC and nixpkgs
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The _snack_ executable comes with a [bundled version of
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nixpkgs](./nix/nixpkgs/nixpkgs-src.json) and uses the GHC executable provided
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by `haskell.packages.ghc822.ghcWithPackages`. You may override those default by
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providing a `snack.nix`:
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``` shell
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$ snack --snack-nix ./snack.nix build
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```
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This file looks like the following:
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``` nix
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rec {
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# If you only wish to change the version of GHC being used, set
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# `ghc-version`. The following versions are currently available:
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# * ghc7103
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# * ghc7103Binary
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# * ghc802
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# * ghc821Binary
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# * ghc822
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# * ghc841
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# * ghc842
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# * ghcHEAD
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# * ghcjs
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# * ghcjsHEAD
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# * integer-simple
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# NOTE: not all versions have been tested with snack.
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ghc-version = "ghc802";
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# Alternatively you can provide you own `ghcWithPackages`, which should have
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# the same structure as that provided by
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# `pkgs.haskell.packages.<version>.ghcWithPackages:
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ghcWithPackages = pkgs.haskellPackages.ghcWithPackages;
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# Finally you can provide your own set of Nix packages, which should evaluate
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# to an attribute set:
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pkgs = import ./nix;
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}
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```
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### Advanced Nix Example
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You may want custom builds that involve things such as [archiving and base64
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encoding entire
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19
bin/Snack.hs
19
bin/Snack.hs
@ -280,9 +280,10 @@ nixBuild snackCfg extraNixArgs nixExpr =
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{ #{ intercalate "," funArgs } }:
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let
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spec = builtins.fromJSON specJson;
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pkgs = import #{ pkgsSrc } {};
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config = #{ pkgsSrc };
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pkgs = config.pkgs;
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libDir = #{ libDir };
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snack = (import libDir) { inherit pkgs; };
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snack = (import libDir) config;
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in #{ T.unpack $ unNixExpr $ nixExpr }
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|])
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"nix-build"
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@ -291,13 +292,17 @@ nixBuild snackCfg extraNixArgs nixExpr =
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pkgsSrc :: String
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pkgsSrc = case snackNix snackCfg of
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Just (SnackNix fp) ->
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[i|(import #{ fp }).pkgs|]
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[i|(import #{ fp })|]
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Nothing ->
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[i|
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(builtins.fetchTarball
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{ url = "https://github.com/${spec.owner}/${spec.repo}/archive/${spec.rev}.tar.gz";
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sha256 = spec.sha256;
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})
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{ pkgs = import
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(
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builtins.fetchTarball
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{ url = "https://github.com/${spec.owner}/${spec.repo}/archive/${spec.rev}.tar.gz";
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sha256 = spec.sha256;
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}
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) {} ;
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}
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|]
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libDir :: String
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libDir = case snackLib snackCfg of
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2
script/install
Executable file
2
script/install
Executable file
@ -0,0 +1,2 @@
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#!/usr/bin/env bash
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nix-env -f ./default.nix -iA snack-exe
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@ -2,6 +2,8 @@
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# TODO: currently single out derivations prepend the PWD to the path
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# TODO: make sure that filters for "base" are airtight
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{ pkgs
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, ghc-version ? "ghc822"
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, ghcWithPackages ? pkgs.haskell.packages.${ghc-version}.ghcWithPackages
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}:
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with pkgs;
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@ -16,7 +18,7 @@ with (callPackage ./package-spec.nix {});
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with (callPackage ./hpack.nix {});
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let
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ghcWith = deps: haskellPackages.ghcWithPackages
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ghcWith = deps: ghcWithPackages
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(ps: map (p: ps.${p}) deps);
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# Assumes the package description describes an executable
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@ -1,4 +1,3 @@
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{}:
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let
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spec = builtins.fromJSON (builtins.readFile ../../../nix/nixpkgs/nixpkgs-src.json);
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nixpkgs =
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@ -1,3 +1,4 @@
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{
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pkgs = ./nix;
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rec {
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pkgs = import ./nix;
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ghcWithPackages = pkgs.haskellPackages.ghcWithPackages;
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}
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@ -16,6 +16,6 @@ test() {
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rm $TMP_FILE
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}
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SNACK="snack -j4 -b snack.nix -s package.nix" test
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SNACK="snack -j4 -b snack.nix" test
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SNACK="snack -j4 -b snack.nix --package-yaml package.yaml" test
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SNACK="snack -j4 --snack-nix snack.nix --package-nix package.nix" test
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SNACK="snack -j4 --snack-nix snack.nix" test
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SNACK="snack -j4 --snack-nix snack.nix --package-yaml package.yaml" test
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