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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