feat: add permissions to file open calls

packages/riot-stdlib/file.ml

@@ -9,12 +9,15 @@ type rw_file = [ `w | `r ] file
 let fd t = t.fd
 let base_permissions = 0o640
 
-let do_open path flags =
-  let raw_fd = Unix.openfile path flags base_permissions in
+let do_open ?(permissions = base_permissions) path flags =
+  let raw_fd = Unix.openfile path flags permissions in
   { fd = Fd.make raw_fd; path }
 
-let open_read path = do_open path Unix.[ O_RDONLY ]
-let open_write path = do_open path Unix.[ O_WRONLY; O_CREAT ]
+let open_read ?permissions path = do_open ?permissions path Unix.[ O_RDONLY ]
+
+let open_write ?permissions path =
+  do_open ?permissions path Unix.[ O_WRONLY; O_CREAT ]
+
 let close t = Fd.close t.fd
 let remove path = Unix.unlink path
 let seek t ~off = Fd.seek t.fd off Unix.SEEK_SET

packages/riot-stdlib/process.ml

@@ -49,5 +49,4 @@ let demonitor pid =
   demonitor pid
 
 let is_alive pid = is_process_alive pid
-
 let register ~name pid = register name pid

packages/riot/riot.mli

@@ -645,8 +645,8 @@ module File : sig
   type rw_file = [ `r | `w ] file
 
   val fd : _ file -> Unix.file_descr
-  val open_read : string -> read_file
-  val open_write : string -> write_file
+  val open_read : ?permissions:int -> string -> read_file
+  val open_write : ?permissions:int -> string -> write_file
   val close : _ file -> unit
   val remove : string -> unit
   val seek : _ file -> off:int -> int