Re: How to debug a failed build of rust application under cargo-build-system?

[Tomas Volf <~@wolfsden.cz>]

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On 2024-02-15 13:06:23 +0000, woshilapin wrote:
> Hi,
>
> It is indeed a code error which looks weird. Are you sure the 2 compilations compile the same source code?

Well, technically I am not sure.  I ran the `guix import crate -r netavark' and
used the output from that.  My expectation was that it would walk the
dependencies, and produce the same dependency tree cargo would use.  Is that a
correct expectation?

> How do you invoke `cargo install`?

    cargo install netavark

Which seems to install 1.10.3 version.  That does match my package:

    (name "netavark")
    (version "1.10.3")
    (source
     (origin
       (method url-fetch)
       (uri (crate-uri "netavark" version))
       (file-name (string-append name "-" version ".tar.gz"))
       (sha256
        (base32 "1viyj9xqq9hkcsghrfx7wjmky3hkxfr96952f9favd4zg9ih64yw"))))
    (build-system cargo-build-system)

When I check the failing tonic crate, both (guix package and in output for the
cargo install above) are in 0.10.2 version.

> Because if you invoke `cargo install --path .`, then I'm pretty sure it's compiling whatever is on your machine at the current directory. However, any other invocation of `cargo install` might actually pull some source from `crates.io` (the package registry for `cargo`). For example, `cargo install cargo-nextest` will download.
> Same applies for `guix build` (I'm a guix very beginner so I might not be the best at this), I'm not sure `guix build` build the current directory. Doesn't it build the `package.scm` which itself describe where to pull the source code?
>
> So, trying a way to be sure that `cargo install` and `guix build` actually build the same source code might a first step. I hope this helps.
>
> Have a nice day.
> --
> woshilapin
>
> Le jeudi 15 février 2024 à 13:43, Tomas Volf <~@wolfsden.cz> a écrit :
>
> > Greetings,
> >
> > I am trying to package a rust application and the build fails. I am not sure
> > how to debug that. When I try to compile the application using `cargo install', it does pass and build just fine. However, when I try to build the application (imported using the cargo importer) using` guix build', I get this error:
> >
> > Compiling tonic v0.10.2
> > error[E0277]: the `?` operator can only be used in an async block that returns `Result` or `Option` (or another type that implements `FromResidual`)
> > --> /tmp/guix-build-netavark-1.10.3.drv-0/netavark-1.10.3/guix-vendor/rust-tonic-0.10.2.tar.gz/src/transport/server/incoming.rs:32:45
> >
> > |
> > 28 | / async_stream::try_stream! {
> > 29 | | tokio::pin!(incoming);
> > 30 | |
> > 31 | | while let Some(item) = incoming.next().await {
> > 32 | | yield item.map(ServerIo::new_io)?
> > | | ^ cannot use the `?` operator in an async block that returns `()`
> > 33 | | }
> > 34 | | }
> > | |_____- this function should return `Result` or `Option` to accept `?`
> > |
> > = help: the trait `FromResidual<std::result::Result<Infallible, IE>>` is not implemented for `()`
> >
> >
> > For more information about this error, try `rustc --explain E0277`.
> > error: could not compile `tonic` (lib) due to previous error
> >
> > I am not know rust, but this looks like a code error? If that is the case, I do
> > not understand why `cargo install' works, since it should be using the same
> > code.
> >
> > Could someone nudge me in the right direction regarding how to debug this issue?
> > I am not really sure where to start.
> >
> > Thank you and have a nice day,
> > Tomas Volf
> >
> > --
> > There are only two hard things in Computer Science:
> > cache invalidation, naming things and off-by-one errors.

--
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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