[Buildroot] [PATCH] support: properly check for bash as a dependency

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, All,

On 2014-03-18 06:01 +0100, Thomas Petazzoni spake thusly:
> On Mon, 17 Mar 2014 11:42:34 +0100, Yann E. MORIN wrote:
> 
> > So, calling "$SHELL --version" will still return "^GNU bash" no matter
> > what shell is actually running.
> > 
> > Since quite a lot of #!/bin/sh scripts are in fact bash scripts, we
> > really want to ensure that /bin/sh is bash.
> 
> I'm definitely against that. My system has /bin/sh pointing to dash,
> and Buildroot works fine. One of the thing that annoyed me in
> OpenEmbedded was its requirements to have /bin/sh be bash.
> 
> We clearly don't want that.

I'm just fine with that. :-)

But the current check is broken anyway, as all it checks is that the
login shell of the user is bash.

  - if we want to work whith dash as the system shell, then the current
    check is unneeded;

  - if we want to work with dash as the system shell, we don't care what
    login shell the user is using, as we must also work when this is dash;

  - SHELL is not mandated by POSIX, so it may be empty on a
    POSIX-compliant shell anyway.

So, we should just remove this check altogether.

> I've just checked the Free Electrons autobuilders, and there are also
> using dash as /bin/sh. This means that if configure scripts were using
> bashims unsupported by dash, we would have noticed.

Andrew, what package was the breakage due to?

Regards,
Yann E. MORIN.

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