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100 lines
3.7 KiB
100 lines
3.7 KiB
// -*- mode:doc; -*-
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// vim: set syntax=asciidoc:
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=== Infrastructure for Cargo-based packages
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Cargo is the package manager for the Rust programming language. It allows the
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user to build programs or libraries written in Rust, but it also downloads and
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manages their dependencies, to ensure repeatable builds. Cargo packages are
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called "crates".
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[[cargo-package-tutorial]]
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==== +cargo-package+ tutorial
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The +Config.in+ file of Cargo-based package 'foo' should contain:
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---------------------------
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01: config BR2_PACKAGE_FOO
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02: bool "foo"
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03: depends on BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS
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04: select BR2_PACKAGE_HOST_RUSTC
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05: help
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06: This is a comment that explains what foo is.
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07:
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08: http://foosoftware.org/foo/
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---------------------------
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And the +.mk+ file for this package should contain:
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------------------------------
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01: ################################################################################
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02: #
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03: # foo
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04: #
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05: ################################################################################
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06:
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07: FOO_VERSION = 1.0
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08: FOO_SOURCE = foo-$(FOO_VERSION).tar.gz
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09: FOO_SITE = http://www.foosoftware.org/download
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10: FOO_LICENSE = GPL-3.0+
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11: FOO_LICENSE_FILES = COPYING
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12:
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13: $(eval $(cargo-package))
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--------------------------------
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The Makefile starts with the definition of the standard variables for
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package declaration (lines 7 to 11).
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As seen in line 13, it is based on the +cargo-package+
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infrastructure. Cargo will be invoked automatically by this
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infrastructure to build and install the package.
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It is still possible to define custom build commands or install
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commands (i.e. with FOO_BUILD_CMDS and FOO_INSTALL_TARGET_CMDS).
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Those will then replace the commands from the cargo infrastructure.
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==== +cargo-package+ reference
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The main macros for the Cargo package infrastructure are
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+cargo-package+ for target packages and +host-cargo-package+ for host
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packages.
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Just like the generic infrastructure, the Cargo infrastructure works
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by defining a number of variables before calling the +cargo-package+
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or +host-cargo-package+ macros.
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First, all the package metadata information variables that exist in
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the generic infrastructure also exist in the Cargo infrastructure:
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+FOO_VERSION+, +FOO_SOURCE+, +FOO_PATCH+, +FOO_SITE+,
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+FOO_DEPENDENCIES+, +FOO_LICENSE+, +FOO_LICENSE_FILES+, etc.
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A few additional variables, specific to the Cargo infrastructure, can
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also be defined. Many of them are only useful in very specific cases,
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typical packages will therefore only use a few of them.
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* +FOO_SUBDIR+ may contain the name of a subdirectory inside the package
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that contains the Cargo.toml file. This is useful, if for example, it
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is not at the root of the tree extracted by the tarball. If
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+HOST_FOO_SUBDIR+ is not specified, it defaults to +FOO_SUBDIR+.
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* +FOO_CARGO_ENV+ can be used to pass additional variables in the
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environment of +cargo+ invocations. It used at both build and
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installation time
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* +FOO_CARGO_BUILD_OPTS+ can be used to pass additional options to
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+cargo+ at build time.
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* +FOO_CARGO_INSTALL_OPTS+ can be used to pass additional options to
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+cargo+ at install time.
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A crate can depend on other libraries from crates.io or git
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repositories, listed in its +Cargo.toml+ file. Buildroot automatically
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takes care of downloading such dependencies as part of the download
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step of packages that use the +cargo-package+ infrastructure. Such
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dependencies are then kept together with the package source code in
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the tarball cached in Buildroot's +DL_DIR+, and therefore the hash of
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the package's tarball includes such dependencies.
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This mechanism ensures that any change in the dependencies will be
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detected, and allows the build to be performed completely offline.
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