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-rw-r--r--lib/sources.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/sources.nix b/lib/sources.nix
index a5765c0fda5..05519c3e392 100644
--- a/lib/sources.nix
+++ b/lib/sources.nix
@@ -105,6 +105,7 @@ rec {
       in type == "directory" || lib.any (ext: lib.hasSuffix ext base) exts;
     in cleanSourceWith { inherit filter; src = path; };
 
+  pathIsGitRepo = path: (builtins.tryEval (commitIdFromGitRepo path)).success;
 
   # Get the commit id of a git repo
   # Example: commitIdFromGitRepo <nixpkgs/.git>