1 files changed, 3 insertions, 0 deletions

diff --git a/nix/libutil/util.hh b/nix/libutil/util.hh
index 44d579f3d6a..ee8e5461b42 100644
--- a/nix/libutil/util.hh
+++ b/nix/libutil/util.hh
@@ -65,6 +65,9 @@ Path readLink(const Path & path);
 
 bool isLink(const Path & path);
 
+/* Return true if the file at PATH is a regular, non-executable file.  */
+bool isPlainFile(const Path & path);
+
 /* Read the contents of a directory.  The entries `.' and `..' are
    removed. */
 struct DirEntry