build: move darwin install_name_tool fixup from vere to king haskell

As well as some variable naming consistency to appease the nixpkgs
gremlins and keep the git history lords on their toes.

ci.nix

@@ -18,7 +18,7 @@ let
 
   # Local library import from derivation functions such as fetchGitHubLFS, etc.
   # upon which local package defintions are dependent.
-  localLib = callPackage ./nix/lib { };
+  libLocal = callPackage ./nix/lib { };
 
   # The key with google storage bucket write permission,
   # deployed to ci via nixops deployment.keys."service-account.json".
@@ -31,31 +31,30 @@ let
     darwin = "x86_64-darwin";
   };
 
-  # Build the ci matrix for each of the supported systems, see finalPackages
+  # Build the ci matrix for each of the supported systems, see pkgsFinal
   # for the total set of attributes that will be evaluated per system.
-in localLib.dimension "system" systems (systemName: system:
+in libLocal.dimension "system" systems (systemName: system:
   let
-    dynamicPackages = import ./default.nix {
+    pkgsShared = import ./default.nix {
       inherit system;
 
       enableStatic = false;
     };
 
-    staticPackages = import ./default.nix {
+    pkgsStatic = import ./default.nix {
       inherit system;
 
       enableStatic = true;
     };
 
     # Filter the stack project to only our locally declared packages.
-    haskellPackages =
-      haskell-nix.haskellLib.selectProjectPackages staticPackages.hs;
+    pkgsHaskell = haskell-nix.haskellLib.selectProjectPackages pkgsStatic.hs;
 
     # The top-level set of attributes to build on ci.
-    finalPackages = {
+    pkgsFinal = {
       # Expose select packages to increase signal-to-noise of the ci dashboard.
-      inherit (staticPackages) urbit;
-      inherit (dynamicPackages) urbit-tests;
+      inherit (pkgsStatic) urbit;
+      inherit (pkgsShared) urbit-tests;
 
       # Expose the nix-shell derivation as a sanity check + possible cache hit.
       shell = import ./shell.nix;
@@ -70,11 +69,11 @@ in localLib.dimension "system" systems (systemName: system:
       # ...
       #
       # Note that .checks are the actual _execution_ of the tests.
-      hs = localLib.collectHaskellComponents haskellPackages;
+      hs = libLocal.collectHaskellComponents pkgsHaskell;
 
       # Push the tarball to the google storage bucket for the current platform.
-      release = let inherit (staticPackages) tarball;
-      in localLib.pushStorageObject {
+      release = let inherit (pkgsStatic) tarball;
+      in libLocal.pushStorageObject {
         inherit serviceAccountKey;
 
         bucket = "bootstrap.urbit.org";
@@ -87,6 +86,6 @@ in localLib.dimension "system" systems (systemName: system:
 
     # Filter derivations that have meta.platform missing the current system,
     # such as testFakeShip on darwin.
-    platformFilter = localLib.platformFilterGeneric system;
+    platformFilter = libLocal.platformFilterGeneric system;
 
-  in localLib.filterAttrsOnlyRecursive (_: v: platformFilter v) finalPackages)
+  in libLocal.filterAttrsOnlyRecursive (_: v: platformFilter v) pkgsFinal)

default.nix

@@ -6,7 +6,7 @@
 
    Static urbit and urbit-worker binaries:
 
-     $ nix-build -A urbit --arg enableSatic true
+     $ nix-build -A urbit --arg enableStatic true
 
    Note that on linux the previous command is equivalent to:
 
@@ -56,32 +56,35 @@
 
 let
 
-  pkgs = import ./nix/default.nix {
+  pkgsNative = import ./nix/default.nix { inherit system; };
+
+  pkgsCross = import ./nix/default.nix {
     inherit system sources config overlays crossOverlays;
 
+    # If we're running on linux and crossSystem is unspecified but
+    # enableStatic = true - set the crossSystem to musl64.
     crossSystem =
-      # If we're running on linux and crossSystem is unspecified but static
-      # builds are requested - set the crossSystem to musl64.
       if system == "x86_64-linux" && crossSystem == null && enableStatic then
         "x86_64-unknown-linux-musl"
       else
         crossSystem;
   };
 
-  # Local library import from derivation functions such as fetchGitHubLFS, etc.
-  # upon which local package defintions are dependent.
-  localLib = pkgs.callPackage ./nix/lib { };
-
-  # Utilise nixpkgs's top-level/static.nix overlay if required.
-  hostPackages = if enableStatic then pkgs.pkgsStatic else pkgs;
+  # Use nixpkgs' top-level/static overlay if enableStatic = true.
+  pkgsStatic = if enableStatic then pkgsCross.pkgsStatic else pkgsCross;
 
   # Enrich the global package set with our local functions and packages.
+  # Cross vs static build dependencies can be selectively overridden for
+  # inputs like python and haskell-nix
   callPackage =
-    pkgs.lib.callPackageWith (hostPackages // localLib // localPackages);
+    pkgsNative.lib.callPackageWith (pkgsStatic // libLocal // pkgsLocal);
+
+  # Local library import-from-derivation functions such as fetchGitHubLFS, etc.
+  libLocal = pkgsNative.callPackage ./nix/lib { };
 
   # Local vendored packages defined in ./pkg.
   # For non-vendored nixpkgs specific package overrides, see ./nix/overlays.
-  localPackages = {
+  pkgsLocal = {
     argon2u = callPackage ./nix/pkgs/argon2u { };
 
     ca-bundle = callPackage ./nix/pkgs/ca-bundle { };
@@ -100,7 +103,7 @@ let
 
     softfloat3 = callPackage ./nix/pkgs/softfloat3 { };
 
-    herb = callPackage ./nix/pkgs/herb { inherit (pkgs) python; };
+    herb = callPackage ./nix/pkgs/herb { inherit (pkgsCross) python; };
 
     arvo = callPackage ./nix/pkgs/arvo { };
 
@@ -113,18 +116,18 @@ let
     urbit = callPackage ./nix/pkgs/urbit { inherit enableStatic; };
 
     hs = callPackage ./nix/pkgs/hs {
-      inherit (pkgs) haskell-nix;
       inherit enableStatic;
+      inherit (pkgsCross) haskell-nix;
     };
   };
 
   # Additional top-level packages and attributes exposed for convenience.
-  extraPackages = with localPackages; rec {
-    # Expose packages we've local customisations for.
-    inherit (hostPackages) libsigsegv;
+  pkgsExtra = with pkgsLocal; rec {
+    # Expose packages we've local customisations (like patches) for easy access.
+    inherit (pkgsCross) libsigsegv;
 
     urbit-debug = urbit.override { enableDebug = true; };
-    urbit-tests = localLib.testFakeShip {
+    urbit-tests = libLocal.testFakeShip {
       inherit herb;
 
       urbit = urbit-debug;
@@ -140,7 +143,7 @@ let
     tarball = let
       name = "urbit-v${urbit.version}-${urbit.system}";
       urbit-king = hs.urbit-king.components.exes.urbit-king;
-    in localLib.makeReleaseTarball {
+    in libLocal.makeReleaseTarball {
       inherit name;
 
       contents = {
@@ -167,16 +170,16 @@ let
     #
     shellFor = { name, packages, ... }@attrs:
       pkgs.mkShell ({
-        inputsFrom = packages localPackages;
+        inputsFrom = packages pkgsLocal;
       } // builtins.removeAttrs attrs [ "packages" ]);
   };
 
   # Ensure that in the case of cross-compilation we're not statically linking
   # against glibc. This is typically a sign that crossSystem is misconfigured.
   checkPlatform =
-    if enableStatic && hostPackages.stdenv.hostPlatform.libc == "glibc" then
+    if enableStatic && pkgsCross.stdenv.hostPlatform.libc == "glibc" then
       builtins.trace "warning: statically linking against glibc."
     else
-      pkgs.lib.id;
+      pkgsNative.lib.id;
 
-in checkPlatform (localPackages // extraPackages)
+in checkPlatform (pkgsLocal // pkgsExtra)

nix/lib/default.nix

@@ -1,3 +1,5 @@
+# Functions that are expected run on the native (non-cross) system.
+
 { lib, recurseIntoAttrs, haskell-nix, callPackage }:
 
 let

nix/pkgs/hs/default.nix

@@ -58,18 +58,27 @@ haskell-nix.stackProject {
       "xhtml"
     ];
 
+    # Override various project-local flags and build configuration.
     packages = {
-      urbit-king.components.exes.urbit-king.enableStatic = enableStatic;
-      urbit-king.components.exes.urbit-king.enableShared = !enableStatic;
+      urbit-king.components.exes.urbit-king = {
+        enableStatic = enableStatic;
+        enableShared = !enableStatic;
 
-      urbit-king.components.exes.urbit-king.configureFlags =
-        lib.optionals enableStatic [
+        configureFlags = lib.optionals enableStatic [
           "--ghc-option=-optl=-L${gmp}/lib"
           "--ghc-option=-optl=-L${libffi}/lib"
           "--ghc-option=-optl=-L${zlib}/lib"
         ] ++ lib.optionals (enableStatic && stdenv.isDarwin)
           [ "--ghc-option=-optl=-L${darwin.libiconv}/lib" ];
 
+        postInstall = lib.optionalString (enableStatic && stdenv.isDarwin) ''
+          find "$out/bin" -type f -exec \
+            install_name_tool -change \
+              ${stdenv.cc.libc}/lib/libSystem.B.dylib \
+              /usr/lib/libSystem.B.dylib {} \;
+        '';
+      };
+
       urbit-king.components.tests.urbit-king-tests.testFlags =
         [ "--brass-pill=${brass.lfs}" ];
     };

nix/pkgs/urbit/default.nix

@@ -54,12 +54,6 @@ in stdenv.mkDerivation {
     mkdir -p $out/bin
     cp ./build/urbit $out/bin/urbit
     cp ./build/urbit-worker $out/bin/urbit-worker
-  '' + lib.optionalString (stdenv.isDarwin && enableStatic) ''
-    # Hack stolen from //nixpkgs/pkgs/stdenv/darwin/portable-libsystem.sh
-    find "$out/bin" -exec \
-      install_name_tool -change \
-        ${stdenv.cc.libc}/lib/libSystem.B.dylib \
-        /usr/lib/libSystem.B.dylib {} \;
   '';
 
   CFLAGS = [ (if enableDebug then "-O0" else "-O3") "-g" ]