bug#28659: v0.13: guix pull fails; libgit2-0.26.0 and 0.25.1 content hashes fail

[Leo Famulari]

On Sun, Oct 01, 2017 at 09:20:42PM +0200, Jan Nieuwenhuizen wrote:
> Jan Nieuwenhuizen writes:
> 
> The changing of the libgit-0.26.0 checksum was already reported about 3
> weeks ago (github seems to only show relative dates)
> 
>     https://github.com/libgit2/libgit2/issues/4343
> 
> and the bug is still open.  It seems to be a github thing.  As I
> understand it, currently our options are to update the hash and pray it
> won't happen again or host libgit2 tarballs ourselves.

I contacted GitHub about this issue a few weeks ago and they said that:

1) They do not guarantee bit-reproducibility of the snapshots they
generate automatically for each release tag, and they wish that people
would not rely on them as we do. However, since people *are* relying on
them, they are discussing this issue internally.
2) This is the relevant code change:
https://git.kernel.org/pub/scm/git/git.git/commit/?id=22f0dcd9634a818a0c83f23ea1a48f2d620c0546

In the meantime, we can add this to the list of reasons that
reproducibility is difficult in the long term.

I don't have any solutions in mind besides keeping substitutes available
for as long as possible and, for users, using substitutes. We might also
petition upstream projects to offer a "real" release tarball.

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