From 097307c46fc5a7bda63a5916cfd1ee3ad661a0a6 Mon Sep 17 00:00:00 2001
From: Profpatsch <mail@profpatsch.de>
Date: Wed, 25 Jul 2018 03:11:41 +0200
Subject: pkgs/profpatsch: WIP execline experiments
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* runExecline: like runCommand, but a lot more lightweight
* symlink: symlink a given list of links together
* importer: a small DSL to “import” “modules” into a build context

Some highlights:
* runExecline does not use any stdenv (apart from the `execline` build)
* symlink uses netstrings to pass correct fields into the derivation
* no use of bash, everything uses execline.
---
 pkgs/profpatsch/default.nix | 41 +++++++++++++++++++++++++++++++++++------
 1 file changed, 35 insertions(+), 6 deletions(-)

(limited to 'pkgs/profpatsch/default.nix')

diff --git a/pkgs/profpatsch/default.nix b/pkgs/profpatsch/default.nix
index 2fcd7c40..f14eb61c 100644
--- a/pkgs/profpatsch/default.nix
+++ b/pkgs/profpatsch/default.nix
@@ -1,21 +1,24 @@
-{ pkgs, callPackage, haskellPackages, droopy, fetchFromGitHub }:
+{ stdenv, pkgs }:
 
-{
+let
+  inherit (pkgs) callPackage;
+
+in rec {
   backlight = callPackage ./backlight { inherit (pkgs.xorg) xbacklight; };
   display-infos = callPackage ./display-infos {};
   nix-http-serve = callPackage ./nix-http-serve {};
   nman = callPackage ./nman {};
   show-qr-code = callPackage ./show-qr-code {};
   warpspeed = callPackage ./warpspeed {
-    inherit (haskellPackages) ghcWithPackages;
+    inherit (pkgs.haskellPackages) ghcWithPackages;
   };
 
   inherit (callPackage ./utils-hs {})
     nix-gen until watch-server;
 
   # patched version of droopy, with javascript user-enhancement
-  droopy = droopy.overrideDerivation (old: {
-    src = fetchFromGitHub {
+  droopy = pkgs.droopy.overrideDerivation (old: {
+    src = pkgs.fetchFromGitHub {
       owner = "Profpatsch";
       repo = "Droopy";
       rev = "55c60c612b913f9fbce9fceebbcb3a332152f1a4";
@@ -28,6 +31,32 @@
     makeWrapperArgs = old.makeWrapperArgs or [] ++ [
       "--set DROOPY_STATIC \"$out/share/droopy/static\""
     ];
-
   });
+
+  # wrapper for execlineb that doesn’t need the execline commands
+  # in PATH to work (making them appear like “builtins”)
+  execlineb-with-builtins =
+    let eldir = "${pkgs.execline}/bin";
+    in pkgs.writeScriptBin "execlineb" ''
+      #!${eldir}/execlineb -s0
+      ${eldir}/define eldir ${eldir}
+      ''${eldir}/importas oldpath PATH
+      ''${eldir}/export PATH "''${eldir}:''${oldpath}"
+      ''${eldir}/execlineb $@
+    '';
+
+  runExecline = import ./execline/run-execline.nix {
+    inherit stdenv;
+    execlinebCommand = "${execlineb-with-builtins}/bin/execlineb";
+    importasCommand = "${pkgs.execline}/bin/importas";
+  };
+
+  symlink = pkgs.callPackage ./execline/symlink.nix {
+    inherit runExecline;
+  };
+
+  importer = pkgs.callPackage ./execline/importer.nix {
+    inherit symlink;
+  };
+
 }
-- 
cgit 1.4.1