[Buildroot] Build failure due to the new "cset existence" check in the GIT downloader

[Baruch Siach]

Hi Markus,

On Mon, Jun 25, 2018 at 04:26:07PM -0700, Markus Mayer wrote:
> Of course GIT *could* check out "master" successfully, if it tried. It
> never tries, because "git rev-parse" doesn't succeed for "master" and
> the download helper bails, assuming that is the right thing to do.

[snip]

> Would it make sense for the download helper to check if the passed in
> "cset" exists as a branch once "rev-parse" returns an error? Or
> perform its check in a different way, so branches are recognized? Or
> try to check out the branch first after the clone operation? It seems
> that the download helper should not artificially abort a build that
> would actually succeed. Right now it's doing exactly that.
> 
> I am not sure what the best solution is, but I don't think the current
> check is correct. What do you think?

The issue of no support for git branches in _VERSION has been discussed at 
length recently. See this detailed summary from Yann, and the rest of that 
thread:

  http://lists.busybox.net/pipermail/buildroot/2018-June/222967.html

baruch

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