bash usage of fdescfs [was: Re: amd64/188699: Dev tree]

[Konstantin Belousov]

On Mon, Apr 21, 2014 at 02:31:12PM -0400, John Baldwin wrote:
> On Thursday, April 17, 2014 2:50:01 pm Konstantin Belousov wrote:
> > The following reply was made to PR amd64/188699; it has been noted by GNATS.
> > 
> > From: Konstantin Belousov <kostikbel at gmail.com>
> > To: John Allman <freebsd at hugme.org>
> > Cc: freebsd-gnats-submit at FreeBSD.org
> > Subject: Re: amd64/188699: Dev tree
> > Date: Thu, 17 Apr 2014 21:44:52 +0300
> > 
> >  On Wed, Apr 16, 2014 at 05:32:45PM +0000, John Allman wrote:
> >  > This is how to reproduce it:
> >  > 
> >  > Fresh install of 10 on AMD 64
> >  > install bash `pkg install bash`
> >  > Switch to bash `bash`
> >  > push a here document into a loop: `while true ; do echo; done< <(echo "123")`
> >  > receive an error: "-su: /dev/fd/62: No such file or directory"
> >  > 
> >  > I'm sorry I haven't been able to research this any further. I found how while working on some important matters. As I mentioned the above works fine in all 
> previous versions of FreeBSD up until 10.
> >  > >How-To-Repeat:
> >  > Fresh install
> >  > pkg install bash
> >  > bash
> >  > while true; do echo foo done< <(echo "123")
> >  > 
> >  > -su: /dev/fd/62: No such file or directory
> >  
> >  So do you have fdescfs mounted on /dev/fd on the machine where the
> >  test fails ?  It works for me on head, and if unmounted, I get the
> >  same failure message as yours.  I very much doubt that it has anything
> >  to do with a system version.
> 
> Question I have is why is bash deciding to use /dev/fd/<n> and require
> fdescfs?  On older releases bash uses named pipes for this instead.

The aclocal.m4 contains the test which verifies the presence and usability
of /dev/fd/n for n>=3 on the _build_ host.  The result of the test
is used on the installation host afterward.

Such kinds of bugs are endemic in our ports, but apparently upstreams
are guilty too.
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