[bug#36841] [PATCH v3] build/cargo-build-system: Patch cargo checksums.

[Efraim Flashner <efraim@flashner.co.il>]

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On Wed, Jul 31, 2019 at 08:00:00PM -0700, Ivan Petkov wrote:
> Hi Efraim,
> 
> > On Jul 30, 2019, at 3:46 AM, Efraim Flashner <efraim@flashner.co.il> wrote:
> > 
> > This one I'm pretty happy with. The checksums are only generated twice
> > when there's a Cargo.lock file present and I've factored out the
> > function to generate all the checksums. When that's moved to (guix build
> > cargo-utils) it can be used by the rust compilers and icecat.
> 
> Overall the patch makes sense to me!
> 
> However, I am curious what are some of the situations in which you’re encountering
> a Cargo.lock file? In a system like guix which maintains all dependencies immutably
> and consistently, the Cargo.lock file is virtually useless (in fact it *could* be harmful
> if an application is released with a Cargo.lock file pinning to a particular vulnerable
> dependency which needs to be updated, requiring patching of the Cargo.lock file).

One is the package that I'm actually targeting, https://github.com/chfi/rust-qtlreaper/ ,
and three of the others are rust-regex and rust-compiler-builtins and
rust-env-logger. All three of them I got from $(guix import crate foo).
`guix import crate env-logger`, for example, returns this:
https://static.crates.io/crates/env_logger/env_logger-0.6.2.crate

> 
> I’d be willing to go as far as suggest we unconditionally delete any Cargo.lock file
> in source tarballs and let cargo generate its own replacement using the vendor
> directory we have supplied. (Imports from crates.io <http://crates.io/> also never include a Cargo.lock
> file, so this may only pertain if we’re performing a direct source import…)

This is basically what my 'update-cargo-lock phase does. Otherwise we
end up packaging arbitrary versions of crates to satisfy whatever
version they were using when they last updated their Cargo.lock.

> 
> —Ivan

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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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