[Buildroot] downloads: removing git repos and offline builds

[Grant Edwards <grant.b.edwards@gmail.com>]

I've been using buildroot for many years and have always been able to
archive (previously in SVN, now in Git/LFS) the contents of the
downloads directory so that production firmware can be built offline
using nothing but files checked out from SVN/Git.  A question has come
up with opkg-utils.  It downloads a source tarball and clones a git
repository:

    $ ls -l downloads/opkg-utils/
    total 48
    drwxr-xr-x 4 grante grante  4096 Nov 19 09:25 git
    -rw-r--r-- 1 grante grante   512 Nov 19 09:25 git.readme
    -rw-r--r-- 1 grante grante 36872 Nov 19 09:25 opkg-utils-0.6.2-br1.tar.gz

Actually, I'm not entirely sure whether it downloaded that tarball or
created it from the git repository -- I now suspect the latter.

In either case, I can't archive a git repository.

It _appears_ that removing the git repo and leaving the tar.gz file is
sufficient for doing a build, and if that tarball is present buildroot
won't need to access the upstream git repository (thus allowing
offline builds using the arhcived tarball).

Requiring offline builds for production firmware can't be that unusual.

Is just removing the git repo and archiving the tarball how people
usually deal with this situation?

--
Grant

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