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-rw-r--r--src/libexpr/primops.cc5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 8a087a781..1de86ad04 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -1412,6 +1412,11 @@ static void prim_readFile(EvalState & state, const Pos & pos, Value * * args, Va
{
PathSet context;
Path path = state.coerceToPath(pos, *args[0], context);
+ if (baseNameOf(path) == "flake.lock")
+ throw Error({
+ .msg = hintfmt("cannot read '%s' because flake lock files can be out of sync", path),
+ .errPos = pos
+ });
try {
state.realiseContext(context);
} catch (InvalidPathError & e) {