Building Rust RPMs

Overview

Building Rust RPMs is still an early topic, and this document is subject to change over time.

Creating a specfile can be sped up by using rust2rpm.

Install cargo:

yum install -y epel-release
yum install -y cargo

Install Python 3 and activate:

 yum install -y centos-release-scl
 yum install -y rh-python36
 scl enable rh-python36 bash

Create a virtualenv and activate:

python -m venv my_project_venv
source my_project_venv/bin/activate

Pull the latest rust2rpm release.
Install the rust2rpm package locally with pip
Run:
```
rust2rpm <PATH/TO/RUST/PROJECT>
```
The generated spec will contain a number of crates listed as [dependencies] under BuildRequires and Requires. We won’t be using those directly; delete all those lines. In addition, remove BuildRequires: rust-packaging, and replace ExclusiveArch: %{rust_arches} with ExclusiveArch: x86_64 or whatever arches you plan to support.
If the package you are working with is part of a workspace, there are a few more edits. Add the following after the Source0: line:
```
Source1:        Cargo.lock
%cargo_bundle_crates -l 1
```

Install the rust-bundled-packaging RPM, built on iml copr:

yum install -y yum-plugin-copr
yum -y copr enable -y managerforlustre/buildtools
yum install -y rust-bundled-packaging spectool

If the package being used is in a workspace, you will need to copy the dir elsewhere. This is so the package is built in a standalone way. If so, copy the dir outside the tree so it’s not associated with the workspace. If you are not in a workspace, skip this step.
Generate a local crate if the project you are building is not on crates.io:
```
cargo package
```
Take the resulting crate and put it into the rpmbuild SOURCES dir.
grab all the deps. In the SOURCES dir:
```
spectool -g <(rpmspec -P name.spec)
```
build the spec:
```
rpmbuild -bs <SPEC_NAME_HERE.spec>
```