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From: "A. Wik (awik32 AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Date: Sun, 16 Aug 2020 15:12:04 +0000
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Subject: Re: Symlinks with executable extensions (suffixes)
To: djgpp AT delorie DOT com, =?UTF-8?Q?J=C3=B6rg_Schilling?= <joerg AT schily DOT net>
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Reply-To: djgpp AT delorie DOT com

On Sun, 16 Aug 2020 at 14:43, Eli Zaretskii (eliz AT gnu DOT org) [via
djgpp AT delorie DOT com] <djgpp AT delorie DOT com> wrote:
>
> > From: "A. Wik (awik32 AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
> > Date: Sun, 16 Aug 2020 08:01:13 +0000
> >
> > > > What can I do about DJGPP-symlinks getting accidentally executed (eg.
> > > > by COMMAND.COM) as binary executables because they have .exe or .com
> > > > extensions?  It can easily hang the machine.
> > >
> > > Don't create symlinks with those extensions?
> >
> > I don't do it deliberately.  They are created by eg. "make install".
>
> I guess some porting is required of those Makefiles.

I will look into that.

> > > DJGPP already has an alternative mechanism for "links" to its
> > > executables (via 'stubedit'), which avoids this problem.  Would it
> > > solve the problem to use that alternative for links to executables?
> >
> > Partially.  But then "ls" won't list them as links, right?
>
> It won't, correct.

I actually found that you can create these symlinks *without* an
executable .extension, but making them point to an executable.
lrw-r--r--  1 root  dos  510 Aug 16 12:18 delmebsh -> bin/bsh.exe

"./delmebsh" will work in bash to invoke the executable, but it cannot
be executed by COMMAND.COM, which is good because the link file won't
be executed as a binary, but the sacrifice is that these links can't
be executed *at all* by the DOS shell (which of course is still better
than hanging the machine).  One workaround is to always use bash, or
to copy the files instead of linking.

-aw