Allow env - atf-run to work by setting a default minimal path.

external/bsd/atf/dist/tools/env.cpp

@@ -48,9 +48,16 @@ namespace impl = tools::env;
 std::string
 impl::get(const std::string& name)
 {
-    const char* val = getenv(name.c_str());
-    assert(val != NULL);
-    return val;
+    const char *n =name.c_str();
+    const char* val = getenv(n);
+    if (val != NULL)
+	return val;
+    if (strcmp(n, "PATH") == 0)
+	return "/bin:/usr/bin";
+	
+    throw tools::system_error(IMPL_NAME "::set",
+			    "Cannot get environment variable '" + name +
+			    "'", errno);
 }
 
 bool