File b40c69380f724933c462ede4b926e3c4f4182d09.patch of Package ocaml-obuild

From b5d17ea03601af1519d2f7a51d9fcee28283e0dc Mon Sep 17 00:00:00 2001
From: Andy Li <andy@onthewings.net>
Date: Tue, 19 Mar 2019 22:39:11 +0800
Subject: [PATCH] Always sort readdir results in order to get reproducible
 builds. (#175)

---
 ext/filesystem.ml | 30 ++++++------------------------
 obuild/project.ml |  2 +-
 2 files changed, 7 insertions(+), 25 deletions(-)

diff --git a/ext/filesystem.ml b/ext/filesystem.ml
index 1a9412a..5914d8c 100644
--- a/ext/filesystem.ml
+++ b/ext/filesystem.ml
@@ -33,17 +33,9 @@ let removeDirContent wpath =
 let removeDir path = removeDirContent path; Unix.rmdir (fp_to_string path); ()
 
 let iterate f path =
-    let dirhandle = Unix.opendir (fp_to_string path) in
-    (try
-        while true do
-            let ent = Unix.readdir dirhandle in
-            if ent <> ".." && ent <> "."
-                then f (fn ent)
-        done;
-    with End_of_file ->
-        ()
-    );
-    Unix.closedir dirhandle;
+    let entries = Sys.readdir (fp_to_string path) in
+    Array.fast_sort String.compare entries;
+    Array.iter (fun ent -> f (fn ent)) entries;
     ()
 
 (* list directory entry with a map function included for efficiency *)
@@ -62,19 +54,9 @@ let list_dir_pred (p : filename -> bool) path : filename list =
 let list_dir = list_dir_pred (const true)
 
 let list_dir_path_pred p path =
-    let accum = ref [] in
-    let dirhandle = Unix.opendir (fp_to_string path) in
-    (try
-        while true do
-            let ent = Unix.readdir dirhandle in
-            if ent <> ".." && p ent
-                then accum := (path </> fn ent) :: !accum
-        done;
-    with End_of_file ->
-        ()
-    );
-    Unix.closedir dirhandle;
-    !accum
+    let entries = List.filter p (Array.to_list (Sys.readdir (fp_to_string path))) in
+    let sorted = List.fast_sort String.compare entries in
+    List.map (fun ent -> path </> fn ent) sorted
 
 let list_dir_path = list_dir_path_pred (const true)
 
diff --git a/obuild/project.ml b/obuild/project.ml
index acec79d..a2d3744 100644
--- a/obuild/project.ml
+++ b/obuild/project.ml
@@ -440,7 +440,7 @@ let make = {
 }
 
 let findPath () =
-    let ents = Array.to_list (Sys.readdir ".") in
+    let ents = List.fast_sort String.compare (Array.to_list (Sys.readdir ".")) in
     match List.find_all (fun ent -> not (string_startswith "." ent) && string_endswith ".obuild" ent) ents with
     | []  -> raise NoConfFile
     | [x] -> fp x