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Daniël de Kok 2f46d77e28 rustPlatform.importCargoLock: init
This function can be used to create an output path that is a cargo
vendor directory. In contrast to e.g. fetchCargoTarball all the
dependent crates are fetched using fixed-output derivations. The
hashes for the fixed-output derivations are gathered from the
Cargo.lock file.

Usage is very simple, e.g.:

importCargoLock {
  lockFile = ./Cargo.lock;
}

would use the lockfile from the current directory.

The implementation of this function is based on Eelco Dolstra's
import-cargo:

https://github.com/edolstra/import-cargo/blob/master/flake.nix

Compared to upstream:

- We use fetchgit in place of builtins.fetchGit.
- Sync to current cargo vendoring.
2021-05-28 08:01:25 +02:00