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cawbird: backport gnutls patches fixing TLS connection issues #72340

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Motivation for this change

Cawbird suffers from frequent TLS connection issues due to a gnutls bug. I backported the fixes for TLS session resumption from gnutls master to gnutls-3.6.9 used in our stable branch. Cawbird now uses a vendored, patched gnutls.
I decided not to apply these changes to nixpkgs master, as gnutls-3.6.11 containing these fixes is supposed to be released in November 2019 and thus will land in the next stable release anyways.

already includes the backport of #72339

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after): increased by 2965304 Bytes
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.
Notify maintainers

cc @

(cherry picked from commit d5c3688)
- frequent TLS connection errors are cause by gnutls (see
https://gitlab.com/gnutls/gnutls/issues/841)
- latest gnutls master contains fixes for that, supposed to be released
in 3.6.11 targeted for November 2019 (see
https://gitlab.com/gnutls/gnutls/commit/afa6e340c084542ef416afc9aaaa6dd0329f5507)
@schmittlauch schmittlauch changed the title Cawbird gnutls cawbird: backport gnutls patches fixing TLS connection issues Oct 31, 2019
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Looks like this needs some further work, unfortunately not all TLS issues are resolved :(

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