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-rw-r--r--lib/sources.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sources.nix b/lib/sources.nix
index 6f8554d340be3..8d259c0837ecc 100644
--- a/lib/sources.nix
+++ b/lib/sources.nix
@@ -10,7 +10,7 @@ rec {
   cleanSource =
     let filter = name: type: let baseName = baseNameOf (toString name); in ! (
       # Filter out Subversion and CVS directories.
-      (type == "directory" && (baseName == ".git" || baseName == ".svn" || baseName == "CVS")) ||
+      (type == "directory" && (baseName == ".git" || baseName == ".svn" || baseName == "CVS" || baseName == ".hg")) ||
       # Filter out backup files.
       (lib.hasSuffix "~" baseName)
     );