[Buildroot] [PATCH 2/4 v3] support/download/git: do not use git archive, handle it manually

[Ben Boeckel <mathstuf@gmail.com>]

On Sat, 02 Jul, 2016 at 17:08:04 GMT, Peter Korsgaard wrote:
> I've wondered if it wouldn't have been simpler to keep git archive and
> then just append the git-archive output of the individual submodules
> (like we do for the generated documentation in make release) with git
> submodule foreach, E.G:
>
> https://ttboj.wordpress.com/2015/07/23/git-archive-with-submodules-and-tar-magic/
>
> Something like:
>
> git archive --prefix=foo/ ... > $TAR
> git submodule foreach --recursive \
>     'git archive --prefix=foo/$path/ $sha1 > $TAR.tmp && tar Af $TAR $TAR.tmp'
> rm $TAR.tmp
>
> But we can do that later if needed.

Here's another approach:

    https://gitlab.kitware.com/paraview/paraview/blob/master/Utilities/Maintenance/create_tarballs.bash#L176

You set up a custom index file and then use `read-tree -i` to read in
the submodules. IMO, using `git archive` should be a requirement because
of export-subst attributes which cause `$Format:$` bits to be replaced
in the archived files.

--Ben