From c66865dff1747ecd55915ef8c549dc1a088ff168 Mon Sep 17 00:00:00 2001
From: Nikolay Amiantov <ab@fmap.me>
Date: Fri, 4 Mar 2016 13:47:19 +0300
Subject: [PATCH] builtins.readFile: Propagate path context

Co-authored-by: Shea Levy <shea@shealevy.com>
---
 src/libexpr/primops.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index d7382af6b..1d2a7d5d2 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -1470,7 +1470,11 @@ static void prim_readFile(EvalState & state, const Pos & pos, Value * * args, Va
     string s = readFile(path);
     if (s.find((char) 0) != string::npos)
         throw Error("the contents of the file '%1%' cannot be represented as a Nix string", path);
-    v.mkString(s);
+    auto refs = state.store->isInStore(path) ?
+        state.store->queryPathInfo(state.store->toStorePath(path).first)->references :
+        StorePathSet{};
+    auto context = state.store->printStorePathSet(refs);
+    v.mkString(s, context);
 }
 
 static RegisterPrimOp primop_readFile({