bug#16406: load prefers directories rather than searching load-path

[npostavs]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: npostavs@users.sourceforge.net
>> Date: Sat, 03 Sep 2016 12:43:29 -0400
>> Cc: 16406@debbugs.gnu.org
>> 
>> > Seems simple enough to fix, here is a patch (this also covers #17848
>> > "add suffix search to -l even when directory part in argument"):
>> 
>> That one broke normal loading.  Here's a new patch.
>
> Instead of doing the search by hand, wouldn't it be better to teach
> 'load' to ignore directories?  Or do we have a use case where finding
> a directory in 'load' would make sense?
>
> IOW, isn't "'load' prefers directories" the actual problem we should
> fix, rather than only fixing the startup problem?
>
> I do agree that the file-exists-p test in command-line-1 should be
> replaced with a test that doesn't let directories through.  But I
> don't understand why using locate-file here is a good idea.

Hmm, I seem to have confused things by trying to combine the fix for
16406 and 17848.  Just replacing the file-exists-p test, as in the patch
below, is enough to fix this bug.  Let's look at 17848 separately.

>From ba8ddc2e039fe982bdfa46519c003808be9ddff3 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Sun, 21 Aug 2016 10:51:38 -0400
Subject: [PATCH v3] Don't --load directories

* lisp/startup.el (command-line-1): Only pass expanded FILENAME argument
of --load when it refers to a normal file, since `load' doesn't handle
directories (Bug #16406).
---
 lisp/startup.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/startup.el b/lisp/startup.el
index fcdc376..45beefb 100644
--- a/lisp/startup.el
+++ b/lisp/startup.el
@@ -2393,7 +2393,7 @@ command-line-1
                             ;; Take file from default dir if it exists there;
                             ;; otherwise let `load' search for it.
                             (file-ex (expand-file-name file)))
-                       (when (file-exists-p file-ex)
+                       (when (and file-ex (file-regular-p file-ex))
                          (setq file file-ex))
                        (load file nil t)))
 
-- 
2.9.3