Always test if file exists before sourcing, in all shells

src/state/opamEnv.ml

@@ -873,25 +873,21 @@ let env_hook_script shell =
     (env_hook_script_base shell)
 
 let source root shell f =
+  let if_exists_source: _ format = match shell with
+    | SH_csh -> "if ( -f %s ) source %s\n"
+    | SH_fish -> "test -r %s && source %s\n"
+    | SH_sh | SH_bash -> "test -r %s && . %s\n"
+    | SH_zsh -> "[[ -r %s ]] && source %s\n"
+    | SH_cmd -> "if exist \"%s\" call \"%s\"\n"
+    | SH_pwsh _ -> "if Test-Path \"%s\" { . \"%s\" }\n"
+  in
   let fname = OpamFilename.prettify (OpamPath.init root // f) in
+  Printf.sprintf if_exists_source fname fname
+
+let if_not_login_script shell t =
   match shell with
-  | SH_csh ->
-    Printf.sprintf "if ( -f %s ) source %s >& /dev/null\n" fname fname
-  | SH_fish ->
-    if f = init_file shell then
-      Printf.sprintf "if not status is-login; and test -r %s\n    source %s\nend\n" fname fname
-    else
-      Printf.sprintf "source %s\n" fname
-  | SH_sh | SH_bash ->
-    Printf.sprintf "test -r %s && . %s > /dev/null 2> /dev/null || true\n"
-      fname fname
-  | SH_zsh ->
-    Printf.sprintf "[[ ! -r %s ]] || source %s  > /dev/null 2> /dev/null\n"
-      fname fname
-  | SH_cmd ->
-    Printf.sprintf "if exist \"%s\" call \"%s\" >NUL 2>NUL\n" fname fname
-  | SH_pwsh _ ->
-    Printf.sprintf ". \"%s\" *> $null\n" fname
+  | SH_fish -> Printf.sprintf "if not status is-login\n    %send\n" t
+  | _ -> t (* Seems this option is only needed for fish *)
 
 let if_interactive_script shell t e =
   let ielse else_opt = match else_opt with
@@ -1116,7 +1112,7 @@ let update_dot_profile root dot_profile shell =
          # This section can be safely removed at any time if needed.\n\
          %s\
          # END opam configuration\n"
-        (source root shell init_file) in
+        (if_not_login_script shell (source root shell init_file)) in
     OpamFilename.write dot_profile (old_body ^ opam_section);
     OpamConsole.msg "  Added %d lines after line %d in %s.\n"
       (count_lines opam_section - 1) (count_lines old_body) pretty_dot_profile
@@ -1168,17 +1164,21 @@ let setup
         opam_root_msg;
       begin match dot_profile with
       | Some dot_profile ->
+        let re = Re.compile (Re.char '\n') in
+        let to_add = Re.replace_string re ~by:"\n    " @@
+                       if_not_login_script shell @@
+                       source root shell @@ init_file shell
+        in
         OpamConsole.msg
           "If you allow it to, this initialisation step will update\n\
-          \  your %s configuration by adding the following line to %s:\n\
+          \  your %s configuration by adding the following line(s) to %s:\n\
            \n\
           \    %s\
            \n\
           \  Otherwise, every time"
         (OpamConsole.colorise `bold (string_of_shell shell))
         (OpamConsole.colorise `cyan @@ OpamFilename.prettify dot_profile)
-        (OpamConsole.colorise `bold @@ String.concat "\n    " @@
-          String.split_on_char '\n' (source root shell (init_file shell)));
+        (OpamConsole.colorise `bold to_add);
       | None ->
         OpamConsole.msg "When"
       end;