refactor(xan): Simplify build infrastructure r/1189

Simplify the build infrastructure for creating shells etc. for xanthous,
including relying more heavily on stuff exposed in Depot anyway, using
shellFor in the shell.nix, and using the haskell.nix branch of all-hies
for a significantly simpler build. At some point the all-hies stuff will
likely want to be promoted up to //third_party, but for now it's
experimental enough that I don't want to bother other people with it.

Change-Id: I43830de73830fdc07d48af9b87d7930f59599532
Reviewed-on: https://cl.tvl.fyi/c/depot/+/890
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>
Reviewed-by: BuildkiteCI

5 files changed, 42 insertions, 71 deletions

diff --git a/users/glittershark/xanthous/default.nix b/users/glittershark/xanthous/default.nix
index c4260fe258..0b89a50afb 100644
--- a/users/glittershark/xanthous/default.nix
+++ b/users/glittershark/xanthous/default.nix
@@ -1,21 +1,7 @@
-{ nixpkgs ? import ./nixpkgs.nix {}
-, pkgs ? nixpkgs.pkgs
-, lib ? nixpkgs.lib
-, compiler ? "ghc865"
-, failOnWarnings ? false
+{ pkgs ? (import ../../../. {}).third_party
+, lib ? pkgs.lib
 , ...
 }:
-let
-  inherit (lib) id;
-  inherit (pkgs) fetchurl;
-  all-hies = import (fetchTarball {
-    url = "https://github.com/infinisil/all-hies/archive/4b6aab017cdf96a90641dc287437685675d598da.tar.gz";
-    sha256 = "0ap12mbzk97zmxk42fk8vqacyvpxk29r2wrnjqpx4m2w9g7gfdya";
-  }) {};
-  hie = all-hies.selection { selector = p: { inherit (p) ghc865; }; };
-  xanthous =
-    (if failOnWarnings then pkgs.haskell.lib.failOnAllWarnings else id)
-      ((pkgs.haskellPackages
-      # .extend (import ./haskell-overlay.nix { inherit pkgs; })
-    ).callPackage (import ./pkg.nix { inherit pkgs; }) {}); in
-xanthous // { inherit hie; }
+pkgs.haskell.lib.failOnAllWarnings (
+  pkgs.haskellPackages.callPackage (import ./pkg.nix { inherit pkgs; }) {}
+)
diff --git a/users/glittershark/xanthous/hie.nix b/users/glittershark/xanthous/hie.nix
new file mode 100644
index 0000000000..c8b1d2b5f5
--- /dev/null
+++ b/users/glittershark/xanthous/hie.nix
@@ -0,0 +1,16 @@
+{ pkgs ? (import ../../../. {}).third_party }:
+
+let
+  all-hies = (fetchTarball {
+    url = "https://github.com/infinisil/all-hies/archive/eff5d9a5e1a84150014095494331cf63e59923af.tar.gz";
+    sha256 = "19bws9fyjhgiikig86cri05fxz1wrz60n69zrigq5wzbyn4hwv9h";
+  });
+
+  sources = import "${all-hies}/sources.nix";
+  build = import "${all-hies}/build.nix";
+
+in (build {
+  glibcName = pkgs.glibc.name;
+  inherit sources;
+  ghcVersion = "8.8.3";
+}).combined
diff --git a/users/glittershark/xanthous/hie.sh b/users/glittershark/xanthous/hie.sh
index 4ea97997c7..223a432203 100755
--- a/users/glittershark/xanthous/hie.sh
+++ b/users/glittershark/xanthous/hie.sh
@@ -1,10 +1,6 @@
 #!/usr/bin/env bash
+set -euo pipefail
 
-cd "$(dirname "${BASH_SOURCE[0]}")" || exit 1
+cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1
 
-argv=( "$@"  )
-argv=( "${argv[@]/\'/\'\\\'\'}"  )
-argv=( "${argv[@]/#/\'}"  )
-argv=( "${argv[@]/%/\'}"  )
-
-exec nix-shell --pure --run "exec $(nix-build -o dist/nix/hie -A hie)/bin/hie ${argv[*]}"
+exec nix-shell --run "$(nix-build -o dist/bin/hie hie.nix)/bin/hie $*"
diff --git a/users/glittershark/xanthous/pkg.nix b/users/glittershark/xanthous/pkg.nix
index 91de68ea32..fc303a3eda 100644
--- a/users/glittershark/xanthous/pkg.nix
+++ b/users/glittershark/xanthous/pkg.nix
@@ -1,16 +1,7 @@
-{ pkgs ? import ./nixpkgs.nix {} }:
-let
-  inherit (builtins) filterSource elem not;
-  gitignoreSource = (import (pkgs.fetchFromGitHub {
-    owner = "hercules-ci";
-    repo = "gitignore";
-    rev = "f9e996052b5af4032fe6150bba4a6fe4f7b9d698";
-    sha256 = "0jrh5ghisaqdd0vldbywags20m2cxpkbbk5jjjmwaw0gr8nhsafv";
-    # date = 2019-09-18T15:15:15+02:00;
-  }) { inherit (pkgs) lib; }).gitignoreSource;
-in
+{ pkgs ? (import ../../../. {}).third_party }:
+
 import (pkgs.haskellPackages.haskellSrc2nix {
   name = "xanthous";
-  src = gitignoreSource ./.;
+  src = pkgs.gitignoreSource ./.;
   extraCabal2nixOptions = "--hpack";
 })
diff --git a/users/glittershark/xanthous/shell.nix b/users/glittershark/xanthous/shell.nix
index b78844c0ee..491f0779f8 100644
--- a/users/glittershark/xanthous/shell.nix
+++ b/users/glittershark/xanthous/shell.nix
@@ -1,35 +1,17 @@
-{ nixpkgs ? import ./nixpkgs.nix {}
-, pkgs ? nixpkgs.pkgs
-, compiler ? "ghc865"
-, withHoogle ? true
-}:
-let
-  pkg = import ./pkg.nix { inherit pkgs; };
+{ pkgs ? (import ../../../. {}).third_party, ... }:
 
-  packageSet = (
-    if compiler == "default"
-    then pkgs.haskellPackages
-    else pkgs.haskell.packages.${compiler}
-  );
+(pkgs.haskellPackages.extend (pkgs.haskell.lib.packageSourceOverrides {
+  xanthous = pkgs.gitignoreSource ./.;
+})).shellFor {
+  packages = p: [p.xanthous];
+  withHoogle = true;
+  buildInputs = with pkgs.haskellPackages; [
+    cabal-install
+    ghc-prof-flamegraph
+    hp2pretty
+  ];
 
-  haskellPackages = (
-    if withHoogle
-    then packageSet.override {
-      overrides = (self: super: {
-        ghc = super.ghc // { withPackages = super.ghc.withHoogle; };
-        ghcWithPackages = self.ghc.withPackages;
-      } // (import ../../../third_party/haskell_overlay { inherit pkgs; })
-        self super);
-    }
-    else packageSet
-  );
-
-  drv = pkgs.haskell.lib.doBenchmark (haskellPackages.callPackage pkg {});
-
-  inherit (pkgs.haskell.lib) addBuildTools;
-in
-(addBuildTools drv (with haskellPackages; [
-  cabal-install
-  ghc-prof-flamegraph
-  hp2pretty
-])).env
+  nativeBuildInputs = [
+    (import ./hie.nix { inherit pkgs; })
+  ];
+}