From f6bce395681577e2c43fb120ecc057dca1b57be9 Mon Sep 17 00:00:00 2001
From: Patrick Ferris <patrick@sirref.org>
Date: Fri, 23 Jan 2026 15:08:57 +0000
Subject: [PATCH] Fail early on CD

---
 src/lib/eval.ml | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/lib/eval.ml b/src/lib/eval.ml
index e81e3c7..dbb4a8f 100644
--- a/src/lib/eval.ml
+++ b/src/lib/eval.ml
@@ -900,7 +900,11 @@ module Make (S : Types.State) (E : Types.Exec) = struct
           match path with
           | Some p ->
               let fp = Fpath.append cwd (Fpath.v p) in
-              Exit.zero @@ S.set_cwd ctx.state fp
+              if Eio.Path.is_directory (ctx.fs / Fpath.to_string fp) then
+                Exit.zero @@ S.set_cwd ctx.state fp
+              else
+                Exit.nonzero_msg ~exit_code:1 ctx.state
+                  "cd: not a directory: %a" Fpath.pp fp
           | None -> (
               match Eunix.find_env "HOME" with
               | None -> Exit.nonzero_msg ctx.state "HOME not set"
-- 
2.51.2