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doc: Document packaging guidelines for Rust crates.

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* doc/contributing.texi (Rust Crates): New section.
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Efraim Flashner 2020-02-17 11:21:27 +02:00
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@ -347,6 +347,7 @@ needed is to review and apply the patch.
* Python Modules:: A touch of British comedy.
* Perl Modules:: Little pearls.
* Java Packages:: Coffee break.
* Rust Crates:: Beware of oxidation.
* Fonts:: Fond of fonts.
@end menu
@ -685,6 +686,40 @@ dashes and prepend the prefix @code{java-}. So the class
@code{java-apache-commons-cli}.
@node Rust Crates
@subsection Rust Crates
@cindex rust
Rust programs standing for themselves are named as any other package, using the
lowercase upstream name.
To prevent namespace collisions we prefix all other Rust packages with the
@code{rust-} prefix. The name should be changed to lowercase as appropriate and
dashes should remain in place.
In the rust ecosystem it is common for multiple incompatible versions of a
package to be used at any given time, so all packages should have a versioned
suffix. If a package has passed version 1.0.0 then just the major version
number is sufficient (e.g.@: @code{rust-clap-2}), otherwise the version suffix
should contain both the major and minor version (e.g.@: @code{rust-rand-0.6}).
Because of the difficulty in reusing rust packages as pre-compiled inputs for
other packages the Cargo build system (@pxref{Build Systems,
@code{cargo-build-system}}) presents the @code{#:cargo-inputs} and
@code{cargo-development-inputs} keywords as build system arguments. It would be
helpful to think of these as similar to @code{propagated-inputs} and
@code{native-inputs}. Rust @code{dependencies} and @code{build-dependencies}
should go in @code{#:cargo-inputs}, and @code{dev-dependencies} should go in
@code{#:cargo-development-inputs}. If a Rust package links to other libraries
then the standard placement in @code{inputs} and the like should be used.
Care should be taken to ensure the correct version of dependencies are used; to
this end we try to refrain from skipping the tests or using @code{#:skip-build?}
when possible. Of course this is not always possible, as the package may be
developed for a different Operating System, depend on features from the Nightly
Rust compiler, or the test suite may have atrophied since it was released.
@node Fonts
@subsection Fonts