From 140bdfdf6c87c1822e0c4ec8f497a20ad1d4cf19 Mon Sep 17 00:00:00 2001
From: lassulus <lassulus@lassul.us>
Date: Sat, 1 Dec 2018 04:20:50 +0100
Subject: populate: add derivation type

---
 lib/types/populate.nix    | 15 +++++++++++++++
 pkgs/populate/default.nix |  4 ++++
 2 files changed, 19 insertions(+)

diff --git a/lib/types/populate.nix b/lib/types/populate.nix
index 2cd3267..49996f6 100644
--- a/lib/types/populate.nix
+++ b/lib/types/populate.nix
@@ -11,6 +11,14 @@
                     else throw "cannot determine type";
         type = lib.types.enum known-types;
       };
+      derivation = lib.mkOption {
+        apply = x:
+          if lib.types.str.check x
+            then { text = x; }
+            else x;
+        default = null;
+        type = lib.types.nullOr (lib.types.either lib.types.str source-types.derivation);
+      };
       file = lib.mkOption {
         apply = x:
           if lib.types.absolute-pathname.check x
@@ -47,6 +55,13 @@
   });
 
   source-types = {
+    derivation = lib.types.submodule {
+      options = {
+        text = lib.mkOption {
+          type = lib.types.str;
+        };
+      };
+    };
     file = lib.types.submodule {
       options = {
         path = lib.mkOption {
diff --git a/pkgs/populate/default.nix b/pkgs/populate/default.nix
index 939ffb3..dcb26b9 100644
--- a/pkgs/populate/default.nix
+++ b/pkgs/populate/default.nix
@@ -20,6 +20,10 @@ let
     fi
   '';
 
+  pop.derivation = target: source: shell' target /* sh */ ''
+    nix-build -E ${quote source.text} -o ${quote target.path}
+  '';
+
   pop.file = target: source: let
     configAttrs = ["useChecksum"];
     config = filterAttrs (name: _: elem name configAttrs) source;
-- 
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