From a7a43adb79393084a27589bc929e5a22877ba944 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Thu, 12 Jul 2012 18:25:01 -0400
Subject: [PATCH] builtins.storePath: resolve symlinks

Needed for Charon/Hydra interaction.
---
 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 7587dccea..5d5f0bfb3 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -502,7 +502,11 @@ static void prim_toPath(EvalState & state, Value * * args, Value & v)
 static void prim_storePath(EvalState & state, Value * * args, Value & v)
 {
     PathSet context;
-    Path path = canonPath(state.coerceToPath(*args[0], context));
+    Path path = state.coerceToPath(*args[0], context);
+    /* Resolve symlinks in ‘path’, unless ‘path’ itself is a symlink
+       directly in the store.  The latter condition is necessary so
+       e.g. nix-push does the right thing. */
+    if (!isStorePath(path)) path = canonPath(path, true);
     if (!isInStore(path))
         throw EvalError(format("path `%1%' is not in the Nix store") % path);
     Path path2 = toStorePath(path);