Mail Archives: cygwin/2009/06/02/09:46:42
On May 24 20:49, Dave Korn wrote:
> admin AT ubik /tmp/exemagic
> $ mv hello.x hello.test.x
>
> admin AT ubik /tmp/exemagic
> $ ls -la
> total 125
> drwxr-xr-x 1 DKAdmin None 0 May 24 20:36 .
> drwxrwxrwt 1 DKAdmin None 90112 May 24 20:36 ..
> -rwxr-xr-x 1 DKAdmin None 34326 May 24 20:36 hello.test.x.exe
> -rw-r--r-- 1 DKAdmin None 121 May 24 20:36 hw.c
>
> I expect this is probably one of those things that there's no way to avoid
> without breaking some far more common usage, perhaps? It's not that bad since
> it still runs as expected, and you can rename it again explicitly to get the
> name you really wanted:
>
> $ ./hello.test.x
> Hello, .exe magic!
>
> admin AT ubik /tmp/exemagic
> $ ls
> hello.test.x.exe hw.c
>
> admin AT ubik /tmp/exemagic
> $ mv hello.test.x.exe hello.test.x
>
> admin AT ubik /tmp/exemagic
> $ ls
> hello.test.x hw.c
>
> ... but I found it a bit surprising. Is it supposed to happen like this? I
> had a look in the recent announcement posts, and in /usr/share/doc, and
> couldn't find much explicit documentation about how exe magic works, but I
> noted that mv doesn't support `--disable-exe-magic'.
Have a look into the rename() routine. It's really tricky to get the
.exe magic right when renaming a file. Every time I change it, another
case crops up which doesn't quite work as expected. Take strip(1)
for example. It strips a file by creating a temporary file without
.exe suffix. It writes the stripped executable into it, then it renames
the temp file back to the original file.
Call `strip foo' on a file actually called foo.exe. Without .exe magic
you end up with a file foo, which is kind of surprising. You expect that
the resulting file is still called foo.exe, and that will work with the
current implementation.
However, other cases might not *quite* work as expected as you found out.
P's are really, really welcome.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
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