Slightly more documented and better musl building code (#59)

* Slightly more documented and better musl building code

* Disabling "codd musl build", since it was always a glibc dyn-linked exe

* Fixing codd.cabal after module removal

.github/workflows/main.yml

@@ -62,8 +62,6 @@ jobs:
     - name: Build codd's library's haddocks
       run: nix-build --no-out-link -A codd.components.library.doc
 
-    - name: Build codd with musl libc
-      run: nix-build --no-out-link nix/codd-exe-musl.nix
       # It's not possible to build docker images on github CI due to lack of nested virtualization
       # run: nix-build --no-out-link nix/docker/codd-exe.nix
 

codd.cabal

@@ -4,7 +4,7 @@ cabal-version: 2.0
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: abcbb0b655fed71c0a4198c34fba34ffd6bbd283d1db8b5ace08fd9630f50019
+-- hash: 666e26d0254071572cb71f6cd82876a39e283bc5f783c8b5579f4ee3f9237e0e
 
 name:           codd
 version:        0.1.0.0
@@ -31,7 +31,6 @@ library
       Codd.Analysis
       Codd.AppCommands
       Codd.AppCommands.AddMigration
-      Codd.AppCommands.CheckMigration
       Codd.AppCommands.VerifyChecksums
       Codd.AppCommands.WriteChecksums
       Codd.Environment

nix/codd-exe-musl.nix

@@ -1,19 +1,23 @@
 let
-  pkgs = import ./nixpkgsMusl.nix;
-  stdenv = pkgs.stdenv;
-  zlib = pkgs.zlib;
-  gmp6 = pkgs.gmp6;
-  projectPkgs = import ../default.nix { inherit pkgs; };
+  pkgs = import ./nixpkgs.nix;
+  muslPkgs = import ../default.nix { pkgs = pkgs.pkgsCross.musl64; };
+  glibcPkgs = import ../default.nix { inherit pkgs; };
 in
-  # The static build thing, which can be read about at https://input-output-hk.github.io/haskell.nix/tutorials/cross-compilation/#static-executables-with-musl-libc
-  # is not working
-  projectPkgs.codd.components.exes.codd.overrideAttrs (oldAttrs: {
-    configureFlags = [
-        "--disable-executable-dynamic"
-        "--disable-shared"
-        "--ghc-option=-optl=-pthread"
-        "--ghc-option=-optl=-static"
-        "--ghc-option=-optl=-L${gmp6.override { withStatic = true; }}/lib"
-        "--ghc-option=-optl=-L${zlib.static}/lib"
-      ];
-  })
+  {
+    # Sadly postgresql doesn't build with musl yet
+    # See https://github.com/input-output-hk/haskell.nix/issues/782
+    codd-musl = muslPkgs.codd.components.exes.codd.overrideAttrs (oldAttrs: {
+      configureFlags = [
+          "--disable-executable-dynamic"
+          "--disable-shared"
+          "--ghc-option=-optl=-pthread"
+          "--ghc-option=-optl=-static"
+
+          # The two below don't use musl gmp6 and zlib. Is this right?
+          "--ghc-option=-optl=-L${pkgs.gmp6.override { withStatic = true; }}/lib"
+          "--ghc-option=-optl=-L${pkgs.zlib.static}/lib"
+        ];
+    });
+
+    codd-glibc = glibcPkgs.codd.components.exes.codd;
+  }

nix/docker/codd-exe.nix

@@ -1,6 +1,8 @@
 let
-  pkgs = import ../nixpkgsMusl.nix;
-  codd-exe = import ../codd-exe-musl.nix;
+  pkgs = import ../nixpkgs.nix;
+
+  # postgresql-lib does not build with musl yet
+  codd-exe = (import ../codd-exe-musl.nix).codd-glibc;
 
   useradd = "${pkgs.shadow}/bin/useradd";
   groupadd = "${pkgs.shadow}/bin/groupadd";