diff --git a/.gitignore b/.gitignore
index 65c12c2..cd098b8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
 _build/
 _coverage/
-result
-/.pre-commit-config.yaml
\ No newline at end of file
+result
\ No newline at end of file
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 120000
index 0000000..2a19533
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1 @@
+/nix/store/y3cj5g3rd064bxpi3r2i1k2nzhk9qrdw-pre-commit-config.json
\ No newline at end of file
diff --git a/bin/flake_env.re b/bin/flake_env.re
index d2b6dfd..4567cb9 100644
--- a/bin/flake_env.re
+++ b/bin/flake_env.re
@@ -12,14 +12,7 @@ let main = () => {
       switch (Lib.Watches.get()) {
       | Ok(watches) =>
         let paths = Array.map(~f=watch => watch.path, watches);
-        let hash =
-          switch (Util.hash_files(paths)) {
-          | Ok(hsh) => hsh
-          | Error(msg) =>
-            Printf.eprintf("%s\n", e);
-            exit(1);
-          };
-
+        let hash = Util.hash_files(paths);
         let profile = layout_directory ++ "/flake-profile-" ++ hash;
         let profile_rc = profile ++ ".rc";
 
diff --git a/direnvrc b/direnvrc
index 85cc4bc..30d8434 100644
--- a/direnvrc
+++ b/direnvrc
@@ -41,7 +41,7 @@ use_flake_env() {
   local ld=$(direnv_layout_dir)
   export direnv
 
-  eval "$(@flake_env@ "${1:-"."}" "$ld")"
+  eval "$(@flake_env@ "$ld" "$@")"
 
   export -n direnv
 
diff --git a/flake_env.opam b/flake_env.opam
index 106f38f..2a66339 100644
--- a/flake_env.opam
+++ b/flake_env.opam
@@ -10,7 +10,7 @@ doc: "https://git.sr.ht/~bryan_bennett/flake_env"
 bug-reports: "https://todo.sr.ht/~bryan_bennett/flake_env"
 depends: [
   "ocaml"
-  "dune" {>= "3.11"}
+  "dune" {>= "3.12"}
   "odoc" {with-doc}
 ]
 build: [
diff --git a/lib/flake_env__util.re b/lib/flake_env__util.re
index e471010..1b5aa7b 100644
--- a/lib/flake_env__util.re
+++ b/lib/flake_env__util.re
@@ -17,39 +17,23 @@ let nix = args =>
   );
 
 let hash_files = filenames => {
-  /*** Hash all entries in [filenames]
-         Returns Some(hex-string) or None if no filenames are found.
-       */
+  /*** Hash all entries in [filenames], returning a hex-encoded string of the hash of their contents */
   let ctx = Sha1.init();
-  let files_to_hash =
+  let () =
     filenames
     |> Array.filter(~f=f =>
          switch (Sys_unix.file_exists(f)) {
          | `Yes => true
-         | _ =>
-           // let fullpth = Filename_unix.realpath(f);
-           Printf.eprintf(
-             "Cannot find file %s (cwd: %s)\n",
-             f,
-             Core_unix.getcwd(),
-           );
-           false;
+         | _ => false
          }
-       );
-
-  switch (files_to_hash |> Array.length) {
-  | 0 => Error("No files found to hash")
-  | _ =>
-    let () =
-      files_to_hash
-      |> Array.iter(~f=f => {
-           f
-           |> In_channel.create
-           |> In_channel.input_all
-           |> Sha1.update_string(ctx)
-         });
-    Ok(Sha1.finalize(ctx) |> Sha1.to_hex);
-  };
+       )
+    |> Array.iter(~f=f => {
+         f
+         |> In_channel.create
+         |> In_channel.input_all
+         |> Sha1.update_string(ctx)
+       });
+  Sha1.finalize(ctx) |> Sha1.to_hex;
 };
 
 let rec rmrf = path => {
diff --git a/tests/flake_env_test_util.re b/tests/flake_env_test_util.re
index 9444d8a..e45ccaf 100644
--- a/tests/flake_env_test_util.re
+++ b/tests/flake_env_test_util.re
@@ -16,22 +16,7 @@ let _syst_to_bool =
 
 let check_exit_or_signal =
   Alcotest.(check(Alcotest.pair(testable_exit_or_signal, string)));
-let testable_result_string =
-  Alcotest.testable(
-    (pp_fmt, elem) => {
-      switch (elem) {
-      | Ok(s) => Fmt.pf(pp_fmt, "Ok(%s)", s)
-      | Error(s) => Fmt.pf(pp_fmt, "Error(%s)", s)
-      }
-    },
-    (a, b) =>
-      switch (a, b) {
-      | (Ok(a), Ok(b)) => String.compare(a, b) == 0
-      | (Error(a), Error(b)) => String.compare(a, b) == 0
-      | _ => false
-      },
-  );
-let check_result_string = Alcotest.(check(testable_result_string));
+let check_string = Alcotest.(check(string));
 let check_bool = Alcotest.(check(bool));
 let check_get_args =
   Alcotest.(
@@ -62,26 +47,26 @@ let test_run_process_stdout = () =>
   );
 
 let test_hash_one = () => {
-  check_result_string(
+  check_string(
     "Hash matches",
-    Ok("32b4ac64be805d730745f6bac45a5d95174ebd10"),
-    hash_files([|"spit_version.sh"|]),
+    hash_files([|"../LICENSE"|]),
+    "b43cf2e824eb66ba0e8f939c08072a8e307b5e5f",
   );
 };
 
 let test_hash_multiple = () => {
-  check_result_string(
+  check_string(
     "Hash matches",
-    Ok("e4c880fc6ab9a1b88e6be18e53fc4cec9f463d1a"),
-    hash_files([|"spit_version.sh", "spit_version.sh"|]),
+    hash_files([|"../LICENSE", "../LICENSE"|]),
+    "08304d8baeed02722f81252952b00f6ac011ce0c",
   );
 };
 
 let test_hash_filters_nonexistent = () => {
-  check_result_string(
+  check_string(
     "Hash matches",
-    Ok("32b4ac64be805d730745f6bac45a5d95174ebd10"),
-    hash_files([|"spit_version.sh", "FOOBARBAZ"|]),
+    hash_files([|"../LICENSE", "FOOBARBAZ"|]),
+    "b43cf2e824eb66ba0e8f939c08072a8e307b5e5f",
   );
 };