On Mon, Feb 26, 2024 at 09:24:29PM -0500, Jason Conroy wrote:
> Hello Efraim,
> 
> Thanks for investigating this - a Rust development workflow using only
> Guix-native crates is something I've been waiting for!
> 
> I was experimenting with your patches and it seems that they do pull in the
> source crates for requested packages, but not their dependencies (example
> below). Is there something I'm missing?

When you say they pull in the source crates do you mean the sources of
the other rust packages needed by rust-rand? I didn't test that, but I
assumed it wouldn't.

Currently if you were to pull in rust-rand-0.8 and rust-rand-0.7 then
you'd have both rand-0.*.crate files in the registry but only one of
them would be listed in share/cargo/registry/index/ra/nd/rand. I need to
adjust the generation of that file to combine multiple sources if they
exist, and sort them (I'm not sure it's necessary, but wouldn't be
surprised if we hit undefined behaviour if they were listed multiple
times or out of order).  I also need to figure out something with a
config.toml to see if it's possible to generate one that could be
included from another one, since you can't add 'local-registry =
$GUIX_PROFILE/...' in a toml file.

> Cheers,
> Jason
> 
> $ guix shell --pure bash findutils rust-rand -- bash -c 'find -L
> $GUIX_ENVIRONMENT/share/cargo'
> /gnu/store/zf88v65rbg2di4qhgdbvhfcjf31rdzby-profile/share/cargo
> /gnu/store/zf88v65rbg2di4qhgdbvhfcjf31rdzby-profile/share/cargo/registry
> /gnu/store/zf88v65rbg2di4qhgdbvhfcjf31rdzby-profile/share/cargo/registry/index
> /gnu/store/zf88v65rbg2di4qhgdbvhfcjf31rdzby-profile/share/cargo/registry/index/ra
> /gnu/store/zf88v65rbg2di4qhgdbvhfcjf31rdzby-profile/share/cargo/registry/index/ra/nd
> /gnu/store/zf88v65rbg2di4qhgdbvhfcjf31rdzby-profile/share/cargo/registry/index/ra/nd/rand
> /gnu/store/zf88v65rbg2di4qhgdbvhfcjf31rdzby-profile/share/cargo/registry/rand-0.8.5.crate
> /gnu/store/zf88v65rbg2di4qhgdbvhfcjf31rdzby-profile/share/cargo/registry/config.json
> 
> On Thu, Dec 14, 2023 at 10:10 AM Efraim Flashner <efraim@flashner.co.il>
> wrote:
> 
> > On Wed, Dec 13, 2023 at 10:34:11AM +0200, Efraim Flashner wrote:
> > > * Compiled rust packages currently have a 'package' phase, which runs
> > > the command used to crate a 'crate tarball', and is installed in
> > > %output/share/cargo/registry, with unpacked sources in
> > > %output/share/cargo/src.  In theory it should be possible to use these
> > > for local rust development.  The benefits include everything that comes
> > > with being a guix package, including pre-patched shebangs.  Currently no
> > > index file is created in $GUIX_ENVIRONMENT/share/cargo/registry/index,
> > > which is likely necessary to actually make use of this.  Additionally, I
> > > am unsure how to use '$GUIX_ENVIRONMENT' in ~/.cargo/config so that it
> > > is expanded and not taken as a literal string.
> >
> > In the Guix London meetup someone mentioned that they were interested in
> > playing around with using Guix for rust development.  I've adjusted the
> > cargo-build-system to produce the registry index files and I added a
> > profile hook to generate the config.json to locate the packaged crates.
> >
> > toml files can't process environment variables (which is probably a good
> > thing ...) but that means its a little harder to test out.
> >
> > with the two patches applied create an environment with the crates you
> > want and get the location of GUIX_ENVIRONMENT:
> > `env | grep GUIX_ENVIRONMENT | cut -f2 -d=`
> >
> > in ~/.cargo/config:
> > [source.crates-io]
> > local-registry = '<location of GUIX_ENVIRONMENT>/share/cargo/registry'
> >
> > 'cargo build' should pull from the local crates in the GUIX_ENVIRONMENT.
> > I'm not sure what happens if it doesn't have those crates available and
> > would need to get them from crates.io.
> >
> >

-- 
Efraim Flashner   <efraim@flashner.co.il>   רנשלפ םירפא
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