mdbook: 0.1.8 -> 0.3.1

[tazjin]

Motivation for this change

Last update in nixpkgs was over a year ago and the project has progressed a lot in between. This moves the derivation to the latest tagged version.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• 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)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

Notify maintainers

cc @Havvy

[srhb]

Looks like the license is (now?) mpl20, not asl20 or mit.

[tazjin]

@srhb You're right! It looks like the license has always been MPL 2.0, so I'm not sure where that came from originally. Updated it, but I can't resolve your comment because it's outside of the original diff and Github won't render it correctly.

[nixos-discourse]

This pull request has been mentioned on Nix community. There might be relevant details there:

https://discourse.nixos.org/t/prs-already-reviewed/2617/50

[samueldr]

Is this comment from the previous PR still relevant? rust-docs/team#23 is not resolved. I'm not even 100% sure I understand it, is it that it would break our rust builds since its documentation wouldn't build?

[tazjin]

@samueldr As far as I can tell, our Rust builds do not depend on mdbook (in fact nothing does, as per rg -i 'mdbook'). The Rust documentation that we do build as part of the standard platform is just what rustdoc creates, which is separate from the book(s).

Hence I don't think this comment is relevant for nixpkgs, but if a Nix user wants to contribute to upstream Rust books they will need to get an older version of the tool to build them.