[Pkg-rust-maintainers] Bug#1020890: rust-ipfs-unixfs - depends on old version of multihash.

[Peter Green]

Package: rust-ipfs-unixfs
Version: 0.2.0-2
Severity: important
X-debbugs-cc: dr at jones.dk
Control: block 1020418 by -1
Control: block 1020419 by -1

rust-ipfs-unixfs depends on version 0.11 of the multihash crate which was superseeded nearly 2 years ago
and depends on an old version of the rustcrypto hash packages. Currently we have two versions of some of
the rustcrypto packages in Debian while others are still on old versions.

Jonas recently requested updates of two more rustcrypto packages block-buffer and block-padding, on the
one hand I think these should be updated, on the other hand I don't really want to further increase the
number of packages for which we are carrying multiple versions in Debian.

So I started looking to see if I could update ipfs-unixfs to use the new version of multihash, the good
news is I managed to get it to build, the bad news is I still have several test failures, I may take
another look at this later, but feedback from someone who actually understands the code would be
appreciated.
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