krebs builders: turn file into module

2 files changed, 273 insertions, 268 deletions

diff --git a/krebs/5pkgs/builders.nix b/krebs/5pkgs/builders.nix
index 49d04be4..18889b6f 100644
--- a/krebs/5pkgs/builders.nix
+++ b/krebs/5pkgs/builders.nix
@@ -1,293 +1,296 @@
-{ config, pkgs, ... }:
+{ pkgs, ... }:
 with import <stockholm/lib>;
-rec {
-  execve = name: { filename, argv ? null, envp ? {}, destination ? "" }: let
-  in writeC name { inherit destination; } /* c */ ''
-    #include <unistd.h>
-
-    static char *const filename = ${toC filename};
-
-    ${if argv == null
-      then /* Propagate arguments */ /* c */ ''
-        #define MAIN_ARGS int argc, char **argv
-      ''
-      else /* Provide fixed arguments */ /* c */ ''
-        #define MAIN_ARGS void
-        static char *const argv[] = ${toC (argv ++ [null])};
-      ''}
-
-    static char *const envp[] = ${toC (
-      mapAttrsToList (k: v: "${k}=${v}") envp ++ [null]
-    )};
-
-    int main (MAIN_ARGS) {
-      execve(filename, argv, envp);
-      return -1;
-    }
-  '';
-
-  execveBin = name: cfg: execve name (cfg // { destination = "/bin/${name}"; });
-
-  makeScriptWriter = interpreter: name: text:
-    assert (with types; either absolute-pathname filename).check name;
-    pkgs.writeOut (baseNameOf name) {
-      ${optionalString (types.absolute-pathname.check name) name} = {
-        executable = true;
-        text = "#! ${interpreter}\n${text}";
-      };
-    };
-
-  writeBash = name: text:
-    assert (with types; either absolute-pathname filename).check name;
-    pkgs.writeOut (baseNameOf name) {
-      ${optionalString (types.absolute-pathname.check name) name} = {
-        check = pkgs.writeDash "shellcheck.sh" ''
-          ${pkgs.haskellPackages.ShellCheck}/bin/shellcheck "$1" || :
-        '';
-        executable = true;
-        text = "#! ${pkgs.bash}/bin/bash\n${text}";
-      };
-    };
-
-  writeBashBin = name:
-    assert types.filename.check name;
-    pkgs.writeBash "/bin/${name}";
-
-  writeC = name: { destination ? "" }: src: pkgs.runCommand name {} /* sh */ ''
-    PATH=${makeBinPath (with pkgs; [
-      binutils
-      coreutils
-      gcc
-    ])}
-    src=${pkgs.writeText "${name}.c" src}
-    exe=$out${destination}
-    mkdir -p "$(dirname "$exe")"
-    gcc -O -Wall -o "$exe" $src
-    strip --strip-unneeded "$exe"
-  '';
-
-  writeDash = makeScriptWriter "${pkgs.dash}/bin/dash";
-
-  writeDashBin = name:
-    assert types.filename.check name;
-    pkgs.writeDash "/bin/${name}";
-
-  writeEximConfig = name: text: pkgs.runCommand name {
-    inherit text;
-    passAsFile = [ "text" ];
-  } /* sh */ ''
-    # TODO validate exim config even with config.nix.useChroot == true
-    # currently doing so will fail because "user exim was not found"
-    #${pkgs.exim}/bin/exim -C "$textPath" -bV >/dev/null
-    mv "$textPath" $out
-  '';
-
-  writeOut = name: specs0:
-  let
-    writers.link =
-      { path
-      , link
-      }:
-      assert path == "" || types.absolute-pathname.check path;
-      assert types.package.check link;
-      {
-        install = /* sh */ ''
-          ${optionalString (dirOf path != "/") /* sh */ ''
-            ${pkgs.coreutils}/bin/mkdir -p $out${dirOf path}
-          ''}
-          ${pkgs.coreutils}/bin/ln -s ${link} $out${path}
-        '';
-      };
+{
+  nixpkgs.config.packageOverrides = _: {
+    execve = name: { filename, argv ? null, envp ? {}, destination ? "" }: let
+    in pkgs.writeC name { inherit destination; } /* c */ ''
+      #include <unistd.h>
+
+      static char *const filename = ${toC filename};
+
+      ${if argv == null
+        then /* Propagate arguments */ /* c */ ''
+          #define MAIN_ARGS int argc, char **argv
+        ''
+        else /* Provide fixed arguments */ /* c */ ''
+          #define MAIN_ARGS void
+          static char *const argv[] = ${toC (argv ++ [null])};
+        ''}
+
+      static char *const envp[] = ${toC (
+        mapAttrsToList (k: v: "${k}=${v}") envp ++ [null]
+      )};
+
+      int main (MAIN_ARGS) {
+        execve(filename, argv, envp);
+        return -1;
+      }
+    '';
 
-    writers.text =
-      { path
-      , check ? null
-      , executable ? false
-      , mode ? if executable then "0755" else "0644"
-      , text
-      }:
-      assert path == "" || types.absolute-pathname.check path;
-      assert types.bool.check executable;
-      assert types.file-mode.check mode;
-      rec {
-        var = "file_${hashString "sha1" path}";
-        val = text;
-        install = /* sh */ ''
-          ${optionalString (check != null) /* sh */ ''
-            ${check} ''$${var}Path
-          ''}
-          ${pkgs.coreutils}/bin/install -m ${mode} -D ''$${var}Path $out${path}
-        '';
+    execveBin = name: cfg:
+      pkgs.execve name (cfg // { destination = "/bin/${name}"; });
+
+    makeScriptWriter = interpreter: name: text:
+      assert (with types; either absolute-pathname filename).check name;
+      pkgs.writeOut (baseNameOf name) {
+        ${optionalString (types.absolute-pathname.check name) name} = {
+          executable = true;
+          text = "#! ${interpreter}\n${text}";
+        };
       };
 
-    write = spec: writers.${spec.type} (removeAttrs spec ["type"]);
+    writeBash = name: text:
+      assert (with types; either absolute-pathname filename).check name;
+      pkgs.writeOut (baseNameOf name) {
+        ${optionalString (types.absolute-pathname.check name) name} = {
+          check = pkgs.writeDash "shellcheck.sh" ''
+            ${pkgs.haskellPackages.ShellCheck}/bin/shellcheck "$1" || :
+          '';
+          executable = true;
+          text = "#! ${pkgs.bash}/bin/bash\n${text}";
+        };
+      };
 
-    specs =
-      mapAttrsToList
-        (path: spec: let
-          known-types = [ "link" "text" ];
-          found-types = attrNames (getAttrs known-types spec);
-          type = assert length found-types == 1; head found-types;
-        in spec // { inherit path type; })
-        specs0;
+    writeBashBin = name:
+      assert types.filename.check name;
+      pkgs.writeBash "/bin/${name}";
+
+    writeC = name: { destination ? "" }: src: pkgs.runCommand name {} /* sh */ ''
+      PATH=${makeBinPath (with pkgs; [
+        binutils
+        coreutils
+        gcc
+      ])}
+      src=${pkgs.writeText "${name}.c" src}
+      exe=$out${destination}
+      mkdir -p "$(dirname "$exe")"
+      gcc -O -Wall -o "$exe" $src
+      strip --strip-unneeded "$exe"
+    '';
 
-    files = map write specs;
+    writeDash = pkgs.makeScriptWriter "${pkgs.dash}/bin/dash";
 
-    filevars = genAttrs' (filter (hasAttr "var") files)
-                         (spec: nameValuePair spec.var spec.val);
+    writeDashBin = name:
+      assert types.filename.check name;
+      pkgs.writeDash "/bin/${name}";
 
-    env = filevars // { passAsFile = attrNames filevars; };
-  in
-    pkgs.runCommand name env /* sh */ ''
-      set -efu
-      ${concatMapStringsSep "\n" (getAttr "install") files}
+    writeEximConfig = name: text: pkgs.runCommand name {
+      inherit text;
+      passAsFile = [ "text" ];
+    } /* sh */ ''
+      # TODO validate exim config even with config.nix.useChroot == true
+      # currently doing so will fail because "user exim was not found"
+      #${pkgs.exim}/bin/exim -C "$textPath" -bV >/dev/null
+      mv "$textPath" $out
     '';
 
-  writeHaskell =
-    k:
+    writeOut = name: specs0:
     let
-      k' = parseDrvName k;
-      name = k'.name;
-      version = if k'.version != "" then k'.version else "0";
-    in
-    { base-depends ? ["base"]
-    , executables ? {}
-    , ghc-options ? ["-Wall" "-O3" "-threaded" "-rtsopts"]
-    , haskellPackages ? pkgs.haskellPackages
-    , library ? null
-    , license ? "WTFPL"
-    }:
-    let
-      isExecutable = executables != {};
-      isLibrary = library != null;
-
-      cabal-file = pkgs.writeText "${name}-${version}.cabal" /* cabal */ ''
-        build-type: Simple
-        cabal-version: >= 1.2
-        name: ${name}
-        version: ${version}
-        ${concatStringsSep "\n" (mapAttrsToList exe-section executables)}
-        ${optionalString isLibrary (lib-section library)}
-      '';
-
-      exe-install =
-        exe-name:
-        { file ? pkgs.writeText "${name}-${exe-name}.hs" text
-        , relpath ? "${exe-name}.hs"
-        , text
-        , ... }:
-        if types.filename.check exe-name
-          then /* sh */ "install -D ${file} $out/${relpath}"
-          else throw "argument ‘exe-name’ is not a ${types.filename.name}";
-
-      exe-section =
-        exe-name:
-        { build-depends ? base-depends ++ extra-depends
-        , extra-depends ? []
-        , file ? pkgs.writeText "${name}-${exe-name}.hs" text
-        , relpath ? "${exe-name}.hs"
-        , text
-        , ... }: /* cabal */ ''
-          executable ${exe-name}
-            build-depends: ${concatStringsSep "," build-depends}
-            ghc-options: ${toString ghc-options}
-            main-is: ${relpath}
-        '';
-
-      get-depends =
-        { build-depends ? base-depends ++ extra-depends
-        , extra-depends ? []
-        , ...
+      writers.link =
+        { path
+        , link
         }:
-        build-depends;
-
-      lib-install =
-        { exposed-modules
-        , ... }:
-        concatStringsSep "\n" (mapAttrsToList mod-install exposed-modules);
-
-      lib-section =
-        { build-depends ? base-depends ++ extra-depends
-        , extra-depends ? []
-        , exposed-modules
-        , ... }: /* cabal */ ''
-          library
-            build-depends: ${concatStringsSep "," build-depends}
-            ghc-options: ${toString ghc-options}
-            exposed-modules: ${concatStringsSep "," (attrNames exposed-modules)}
-        '';
-
-      mod-install =
-        mod-name:
-        { file ? pkgs.writeText "${name}-${mod-name}.hs" text
-        , relpath ? "${replaceStrings ["."] ["/"] mod-name}.hs"
+        assert path == "" || types.absolute-pathname.check path;
+        assert types.package.check link;
+        {
+          install = /* sh */ ''
+            ${optionalString (dirOf path != "/") /* sh */ ''
+              ${pkgs.coreutils}/bin/mkdir -p $out${dirOf path}
+            ''}
+            ${pkgs.coreutils}/bin/ln -s ${link} $out${path}
+          '';
+        };
+
+      writers.text =
+        { path
+        , check ? null
+        , executable ? false
+        , mode ? if executable then "0755" else "0644"
         , text
-        , ... }:
-        if types.haskell.modid.check mod-name
-          then /* sh */ "install -D ${file} $out/${relpath}"
-          else throw "argument ‘mod-name’ is not a ${types.haskell.modid.name}";
+        }:
+        assert path == "" || types.absolute-pathname.check path;
+        assert types.bool.check executable;
+        assert types.file-mode.check mode;
+        rec {
+          var = "file_${hashString "sha1" path}";
+          val = text;
+          install = /* sh */ ''
+            ${optionalString (check != null) /* sh */ ''
+              ${check} ''$${var}Path
+            ''}
+            ${pkgs.coreutils}/bin/install -m ${mode} -D ''$${var}Path $out${path}
+          '';
+        };
+
+      write = spec: writers.${spec.type} (removeAttrs spec ["type"]);
+
+      specs =
+        mapAttrsToList
+          (path: spec: let
+            known-types = [ "link" "text" ];
+            found-types = attrNames (getAttrs known-types spec);
+            type = assert length found-types == 1; head found-types;
+          in spec // { inherit path type; })
+          specs0;
+
+      files = map write specs;
+
+      filevars = genAttrs' (filter (hasAttr "var") files)
+                           (spec: nameValuePair spec.var spec.val);
+
+      env = filevars // { passAsFile = attrNames filevars; };
     in
-      haskellPackages.mkDerivation {
-        inherit isExecutable isLibrary license version;
-        executableHaskellDepends =
-          attrVals
-            (concatMap get-depends (attrValues executables))
-            haskellPackages;
-        libraryHaskellDepends =
-          attrVals
-            (optionals isLibrary (get-depends library))
-            haskellPackages;
-        pname = name;
-        src = pkgs.runCommand "${name}-${version}-src" {} /* sh */ ''
-          install -D ${cabal-file} $out/${cabal-file.name}
-          ${optionalString isLibrary (lib-install library)}
-          ${concatStringsSep "\n" (mapAttrsToList exe-install executables)}
-        '';
-      };
-
-  writeJq = name: src: pkgs.runCommand name {} /* sh */ ''
-    name=${assert types.filename.check name; name}
-    src=${shell.escape src}
+      pkgs.runCommand name env /* sh */ ''
+        set -efu
+        ${concatMapStringsSep "\n" (getAttr "install") files}
+      '';
 
-    # syntax check
-    printf '%s' "$src" > src.jq
-    ${pkgs.jq}/bin/jq -f src.jq < /dev/null
+    writeHaskell =
+      k:
+      let
+        k' = parseDrvName k;
+        name = k'.name;
+        version = if k'.version != "" then k'.version else "0";
+      in
+      { base-depends ? ["base"]
+      , executables ? {}
+      , ghc-options ? ["-Wall" "-O3" "-threaded" "-rtsopts"]
+      , haskellPackages ? pkgs.haskellPackages
+      , library ? null
+      , license ? "WTFPL"
+      }:
+      let
+        isExecutable = executables != {};
+        isLibrary = library != null;
+
+        cabal-file = pkgs.writeText "${name}-${version}.cabal" /* cabal */ ''
+          build-type: Simple
+          cabal-version: >= 1.2
+          name: ${name}
+          version: ${version}
+          ${concatStringsSep "\n" (mapAttrsToList exe-section executables)}
+          ${optionalString isLibrary (lib-section library)}
+        '';
 
-    cp src.jq "$out"
-  '';
+        exe-install =
+          exe-name:
+          { file ? pkgs.writeText "${name}-${exe-name}.hs" text
+          , relpath ? "${exe-name}.hs"
+          , text
+          , ... }:
+          if types.filename.check exe-name
+            then /* sh */ "install -D ${file} $out/${relpath}"
+            else throw "argument ‘exe-name’ is not a ${types.filename.name}";
+
+        exe-section =
+          exe-name:
+          { build-depends ? base-depends ++ extra-depends
+          , extra-depends ? []
+          , file ? pkgs.writeText "${name}-${exe-name}.hs" text
+          , relpath ? "${exe-name}.hs"
+          , text
+          , ... }: /* cabal */ ''
+            executable ${exe-name}
+              build-depends: ${concatStringsSep "," build-depends}
+              ghc-options: ${toString ghc-options}
+              main-is: ${relpath}
+          '';
+
+        get-depends =
+          { build-depends ? base-depends ++ extra-depends
+          , extra-depends ? []
+          , ...
+          }:
+          build-depends;
+
+        lib-install =
+          { exposed-modules
+          , ... }:
+          concatStringsSep "\n" (mapAttrsToList mod-install exposed-modules);
+
+        lib-section =
+          { build-depends ? base-depends ++ extra-depends
+          , extra-depends ? []
+          , exposed-modules
+          , ... }: /* cabal */ ''
+            library
+              build-depends: ${concatStringsSep "," build-depends}
+              ghc-options: ${toString ghc-options}
+              exposed-modules: ${concatStringsSep "," (attrNames exposed-modules)}
+          '';
+
+        mod-install =
+          mod-name:
+          { file ? pkgs.writeText "${name}-${mod-name}.hs" text
+          , relpath ? "${replaceStrings ["."] ["/"] mod-name}.hs"
+          , text
+          , ... }:
+          if types.haskell.modid.check mod-name
+            then /* sh */ "install -D ${file} $out/${relpath}"
+            else throw "argument ‘mod-name’ is not a ${types.haskell.modid.name}";
+      in
+        haskellPackages.mkDerivation {
+          inherit isExecutable isLibrary license version;
+          executableHaskellDepends =
+            attrVals
+              (concatMap get-depends (attrValues executables))
+              haskellPackages;
+          libraryHaskellDepends =
+            attrVals
+              (optionals isLibrary (get-depends library))
+              haskellPackages;
+          pname = name;
+          src = pkgs.runCommand "${name}-${version}-src" {} /* sh */ ''
+            install -D ${cabal-file} $out/${cabal-file.name}
+            ${optionalString isLibrary (lib-install library)}
+            ${concatStringsSep "\n" (mapAttrsToList exe-install executables)}
+          '';
+        };
+
+    writeJq = name: src: pkgs.runCommand name {} /* sh */ ''
+      name=${assert types.filename.check name; name}
+      src=${shell.escape src}
+
+      # syntax check
+      printf '%s' "$src" > src.jq
+      ${pkgs.jq}/bin/jq -f src.jq < /dev/null
+
+      cp src.jq "$out"
+    '';
 
-  writeJSON = name: value: pkgs.writeText name (toJSON value);
+    writeJSON = name: value: pkgs.writeText name (toJSON value);
 
-  writeNixFromCabal =
-    trace (toString [
-      "The function `writeNixFromCabal` has been deprecated in favour of"
-      "`writeHaskell`."
-    ])
-    (name: path: pkgs.runCommand name {} /* sh */ ''
-      ${pkgs.cabal2nix}/bin/cabal2nix ${path} > $out
-    '');
+    writeNixFromCabal =
+      trace (toString [
+        "The function `writeNixFromCabal` has been deprecated in favour of"
+        "`writeHaskell`."
+      ])
+      (name: path: pkgs.runCommand name {} /* sh */ ''
+        ${pkgs.cabal2nix}/bin/cabal2nix ${path} > $out
+      '');
 
-  writePython2 = name: src: pkgs.runCommand name {} /* sh */ ''
-    name=${assert types.filename.check name; name}
-    src=${shell.escape src}
+    writePython2 = name: src: pkgs.runCommand name {} /* sh */ ''
+      name=${assert types.filename.check name; name}
+      src=${shell.escape src}
 
-    # syntax check
-    printf '%s' "$src" > src.py
-    ${pkgs.python2}/bin/python -m py_compile src.py
+      # syntax check
+      printf '%s' "$src" > src.py
+      ${pkgs.python2}/bin/python -m py_compile src.py
 
-    cp src.py "$out"
-  '';
+      cp src.py "$out"
+    '';
 
-  writePython3 = name: src: pkgs.runCommand name {} /* sh */ ''
-    name=${assert types.filename.check name; name}
-    src=${shell.escape src}
+    writePython3 = name: src: pkgs.runCommand name {} /* sh */ ''
+      name=${assert types.filename.check name; name}
+      src=${shell.escape src}
 
-    # syntax check
-    printf '%s' "$src" > src.py
-    ${pkgs.python3}/bin/python -m py_compile src.py
+      # syntax check
+      printf '%s' "$src" > src.py
+      ${pkgs.python3}/bin/python -m py_compile src.py
 
-    cp src.py "$out"
-  '';
+      cp src.py "$out"
+    '';
 
-  writeSed = makeScriptWriter "${pkgs.gnused}/bin/sed -f";
+    writeSed = pkgs.makeScriptWriter "${pkgs.gnused}/bin/sed -f";
+  };
 }
diff --git a/krebs/5pkgs/default.nix b/krebs/5pkgs/default.nix
index ec9b6bdb..379022b6 100644
--- a/krebs/5pkgs/default.nix
+++ b/krebs/5pkgs/default.nix
@@ -1,6 +1,9 @@
 { config, lib, pkgs, ... }@args:
 with import <stockholm/lib>;
 {
+  imports = [
+    ./builders.nix
+  ];
   nixpkgs.config.packageOverrides = oldpkgs: let
 
     # This callPackage will try to detect obsolete overrides.
@@ -15,7 +18,6 @@ with import <stockholm/lib>;
       else override;
 
   in {}
-  // import ./builders.nix args
   // mapAttrs (_: flip callPackage {})
               (filterAttrs (_: dir: pathExists (dir + "/default.nix"))
                            (subdirsOf ./.))