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-rw-r--r--src/libexpr/primops.cc10
-rw-r--r--src/libstore/gc.cc25
2 files changed, 23 insertions, 12 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 070e72f3a966..350dba47409e 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -832,8 +832,14 @@ static void prim_pathExists(EvalState & state, const Pos & pos, Value * * args,
 {
     PathSet context;
     Path path = state.coerceToPath(pos, *args[0], context);
-    if (!context.empty())
-        throw EvalError(format("string '%1%' cannot refer to other paths, at %2%") % path % pos);
+    try {
+        state.realiseContext(context);
+    } catch (InvalidPathError & e) {
+        throw EvalError(format(
+                "cannot check the existence of '%1%', since path '%2%' is not valid, at %3%")
+            % path % e.path % pos);
+    }
+
     try {
         mkBool(v, pathExists(state.checkSourcePath(path)));
     } catch (SysError & e) {
diff --git a/src/libstore/gc.cc b/src/libstore/gc.cc
index 26e2b0dca7ca..83cdf13a6a64 100644
--- a/src/libstore/gc.cc
+++ b/src/libstore/gc.cc
@@ -444,17 +444,22 @@ void LocalStore::findRuntimeRoots(Roots & roots, bool censor)
     }
 
 #if !defined(__linux__)
-    try {
-        std::regex lsofRegex(R"(^n(/.*)$)");
-        auto lsofLines =
-            tokenizeString<std::vector<string>>(runProgram(LSOF, true, { "-n", "-w", "-F", "n" }), "\n");
-        for (const auto & line : lsofLines) {
-            std::smatch match;
-            if (std::regex_match(line, match, lsofRegex))
-                unchecked[match[1]].emplace("{lsof}");
+    // lsof is really slow on OS X. This actually causes the gc-concurrent.sh test to fail.
+    // See: https://github.com/NixOS/nix/issues/3011
+    // Because of this we disable lsof when running the tests.
+    if (getEnv("_NIX_TEST_NO_LSOF") == "") {
+        try {
+            std::regex lsofRegex(R"(^n(/.*)$)");
+            auto lsofLines =
+                tokenizeString<std::vector<string>>(runProgram(LSOF, true, { "-n", "-w", "-F", "n" }), "\n");
+            for (const auto & line : lsofLines) {
+                std::smatch match;
+                if (std::regex_match(line, match, lsofRegex))
+                    unchecked[match[1]].emplace("{lsof}");
+            }
+        } catch (ExecError & e) {
+            /* lsof not installed, lsof failed */
         }
-    } catch (ExecError & e) {
-        /* lsof not installed, lsof failed */
     }
 #endif