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-rw-r--r--lib/sources.nix2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/sources.nix b/lib/sources.nix
index 8f312a9db5c..0ec4c020e54 100644
--- a/lib/sources.nix
+++ b/lib/sources.nix
@@ -17,6 +17,8 @@ rec {
     (type == "directory" && (baseName == ".git" || baseName == ".svn" || baseName == "CVS" || baseName == ".hg")) ||
     # Filter out backup files.
     lib.hasSuffix "~" baseName ||
+    builtins.match "^.*\.sw[a-z]$" baseName != null ||
+
     # Filter out generates files.
     lib.hasSuffix ".o" baseName ||
     lib.hasSuffix ".so" baseName ||