From 7a450a8ba97bc7521b850de66366c7202d45a111 Mon Sep 17 00:00:00 2001
From: Graham Christensen <graham@grahamc.com>
Date: Mon, 2 Jun 2025 14:08:42 -0400
Subject: [PATCH] Update src/libexpr/paths.cc

---
 src/libexpr/paths.cc | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/libexpr/paths.cc b/src/libexpr/paths.cc
index e7dfa549c..cbe557033 100644
--- a/src/libexpr/paths.cc
+++ b/src/libexpr/paths.cc
@@ -57,9 +57,10 @@ std::string EvalState::computeBaseName(const SourcePath & path, PosIdx pos)
     if (path.accessor == rootFS) {
         if (auto storePath = store->maybeParseStorePath(path.path.abs())) {
             warn(
-                "Performing inefficient double copy of path '%s' to the store at %s. "
-                "This can typically be avoided by rewriting an attribute like `src = ./.` "
-                "to `src = builtins.path { path = ./.; name = \"source\"; }`.",
+                "Copying '%s' to the store again\n"
+                "You can make Nix evaluate faster and copy fewer files by replacing `./.` with the `self` flake input, "
+                "or `builtins.path { path = ./.; name = \"source\"; }`\n\n"
+                "Location: %s\n",
                 path,
                 positions[pos]);
             return std::string(fetchToStore(*store, path, FetchMode::DryRun, storePath->name()).to_string());