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-rw-r--r--src/libexpr/flake/flakeref.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libexpr/flake/flakeref.cc b/src/libexpr/flake/flakeref.cc
index 397b1b84b..3ebaada15 100644
--- a/src/libexpr/flake/flakeref.cc
+++ b/src/libexpr/flake/flakeref.cc
@@ -111,6 +111,9 @@ std::pair<FlakeRef, std::string> parseFlakeRefWithFragment(
throw BadURL("flake reference '%s' is not an absolute path", url);
path = absPath(path, baseDir, true);
+ if (!S_ISDIR(lstat(path).st_mode))
+ throw BadURL("path '%s' is not a flake (because it's not a directory)", path);
+
auto flakeRoot = path;
std::string subdir;