Woliveiras Geremmyas Rust Release

Rust Release Engineering

Workflow for versioning, publishing, and distributing Rust crates and binaries.

When to Use

• Publishing a library crate to crates.io
• Setting up automated release pipelines
• Distributing compiled binaries (CLI tools, services)
• Managing changelogs and SemVer bumps
• Cross-compiling for multiple targets

Library Crate Release

Tools

Process

1. Ensure Cargo.toml has complete metadata: description, license, repository, keywords, categories, rust-version.
2. Run cargo semver-checks to detect unintentional breaking changes.
3. Update version following SemVer:
   • MAJOR: breaking public API changes
   • MINOR: new public functionality, backward-compatible
   • PATCH: bug fixes only
4. Update CHANGELOG.md (or let release-plz generate it).
5. Run full CI (fmt, clippy, test, doc).
6. Tag the release: vX.Y.Z.
7. Publish: cargo publish --dry-run then cargo publish.

release-plz Automation

# .github/workflows/release.yml
name: release

on:
  push:
    branches: [main]

jobs:
  release-plz:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - uses: dtolnay/rust-toolchain@stable
      - uses: MarcoIeni/release-plz-action@v0.5
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}

cargo yank

• Removes a version from the index for new resolves
• Does NOT delete the published artifact
• Use for broken versions, not for "un-publishing"

Binary Distribution

Tools

Process

1. Define target platforms in Cargo.toml:

   # dist.toml or Cargo.toml [workspace.metadata.dist]
   [dist]
   cargo-dist-version = "0.27.0"
   targets = ["x86_64-unknown-linux-gnu", "aarch64-apple-darwin", "x86_64-pc-windows-msvc"]
   installers = ["shell", "powershell", "homebrew"]
   

2. Initialize: cargo dist init
3. Build locally: cargo dist build
4. CI generates release artifacts on tag push.

Cross-Compilation

Native:

rustup target add aarch64-unknown-linux-gnu
cargo build --target aarch64-unknown-linux-gnu

With cross (zero-setup, uses Docker):

cross build --target aarch64-unknown-linux-gnu --release
cross test --target aarch64-unknown-linux-gnu

Docker Builds with cargo-chef

FROM rust:1.85 AS chef
RUN cargo install cargo-chef
WORKDIR /app

FROM chef AS planner
COPY . .
RUN cargo chef prepare --recipe-path recipe.json

FROM chef AS builder
COPY --from=planner /app/recipe.json recipe.json
RUN cargo chef cook --release --recipe-path recipe.json
COPY . .
RUN cargo build --release

FROM debian:bookworm-slim
COPY --from=builder /app/target/release/myapp /usr/local/bin/
ENTRYPOINT ["myapp"]

Cargo.toml Metadata Checklist

[package]
name = "my-crate"
version = "0.1.0"
edition = "2024"
rust-version = "1.85"
description = "One-line description"
license = "MIT OR Apache-2.0"
repository = "https://github.com/user/repo"
keywords = ["keyword1", "keyword2"]
categories = ["category"]
readme = "README.md"

[package.metadata.docs.rs]
all-features = true

Workspace Release

For workspaces with multiple crates:

• release-plz handles independent versioning per crate
• Use [workspace.dependencies] for shared dependency versions
• Publish in dependency order (leaf crates first)
• Consider cargo-workspaces for coordinated releases

Pre-Release Validation

Before any release:

1. cargo fmt --all -- --check
2. cargo clippy --workspace --all-targets --all-features -- -D warnings
3. cargo test --workspace --all-features
4. cargo doc --workspace --all-features --no-deps
5. cargo semver-checks (for libraries)
6. cargo publish --dry-run
7. Verify MSRV: cargo hack check --rust-version --workspace

Source: woliveiras/geremmyas — distributed by TomeVault.