1 files changed, 17 insertions, 23 deletions

diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 3e37c7f60..2721b6733 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -368,7 +368,7 @@ void initGC()
             size = (pageSize * pages) / 4; // 25% of RAM
         if (size > maxSize) size = maxSize;
 #endif
-        debug(format("setting initial heap size to %1% bytes") % size);
+        debug("setting initial heap size to %1% bytes", size);
         GC_expand_hp(size);
     }
 
@@ -519,7 +519,6 @@ EvalState::EvalState(
     static_assert(sizeof(Env) <= 16, "environment must be <= 16 bytes");
 
     /* Initialise the Nix expression search path. */
-    evalSettings.nixPath.setDefault(evalSettings.getDefaultNixPath());
     if (!evalSettings.pureEval) {
         for (auto & i : _searchPath) addToSearchPath(i);
         for (auto & i : evalSettings.nixPath.get()) addToSearchPath(i);
@@ -610,7 +609,7 @@ Path EvalState::checkSourcePath(const Path & path_)
     }
 
     /* Resolve symlinks. */
-    debug(format("checking access to '%s'") % abspath);
+    debug("checking access to '%s'", abspath);
     Path path = canonPath(abspath, true);
 
     for (auto & i : *allowedPaths) {
@@ -2473,35 +2472,30 @@ std::ostream & operator << (std::ostream & str, const ExternalValueBase & v) {
 
 EvalSettings::EvalSettings()
 {
+    auto var = getEnv("NIX_PATH");
+    if (var) nixPath = parseNixPath(*var);
 }
 
-/* impure => NIX_PATH or a default path
- * restrict-eval => NIX_PATH
- * pure-eval => empty
- */
 Strings EvalSettings::getDefaultNixPath()
 {
-    if (pureEval)
-        return {};
-
-    auto var = getEnv("NIX_PATH");
-    if (var) {
-        return parseNixPath(*var);
-    } else if (restrictEval) {
-        return {};
-    } else {
-        Strings res;
-        auto add = [&](const Path & p, const std::optional<std::string> & s = std::nullopt) {
-            if (pathExists(p))
-                res.push_back(s ? *s + "=" + p : p);
-        };
+    Strings res;
+    auto add = [&](const Path & p, const std::string & s = std::string()) {
+        if (pathExists(p)) {
+            if (s.empty()) {
+                res.push_back(p);
+            } else {
+                res.push_back(s + "=" + p);
+            }
+        }
+    };
 
+    if (!evalSettings.restrictEval && !evalSettings.pureEval) {
         add(settings.useXDGBaseDirectories ? getStateDir() + "/nix/defexpr/channels" : getHome() + "/.nix-defexpr/channels");
         add(settings.nixStateDir + "/profiles/per-user/root/channels/nixpkgs", "nixpkgs");
         add(settings.nixStateDir + "/profiles/per-user/root/channels");
-
-        return res;
     }
+
+    return res;
 }
 
 bool EvalSettings::isPseudoUrl(std::string_view s)