Local cargo config

This repository ships with a .cargo/config.toml that replaces the crates.io registry with packaged crates located in /usr/share/cargo/registry.

A similar config is also applied building with dh_cargo. Cargo.lock needs to be deleted when switching between packaged crates and crates.io, since the checksums are not compatible.

To reference new dependencies (or updated versions) that are not yet packaged, the dependency needs to point directly to a path or git source.

Quickly installing all packages from apt

To a void too many manual installations when mk-build-deps etc. fail, a quick way to install all the main packages of this workspace is to run:

# apt install $(make list-packages)

Steps for Releases

• Run ./bump.sh <CRATE> [patch|minor|major|<VERSION>]
  • Fill out changelog
  • Confirm bump commit
• Build packages with make <crate>-deb.
  • Don't forget to commit updated d/control!

Adding Crates

1. At the top level:

   • Generate the crate: cargo new --lib the-name
   • Sort the crate into Cargo.toml's workspace.members

2. In the new crate's Cargo.toml:

   • In [package] set:

     authors.workspace = true
     edition.workspace = true
     exclude.workspace = true
     homepage.workspace = true
     license.workspace = true
     repository.workspace = true
     rust-version.workspace = true
     

     If a separate exclude is need it, separate it out as its own block above the inherited fields.

   • Add a meaningful description

   • Copy debian/copyright and debian/debcargo.toml from another subcrate.

3. In the new crate's lib.rs, add the following preamble on top:

   #![cfg_attr(docsrs, feature(doc_cfg, doc_auto_cfg))]
   

4. Ideally (but optionally) in the new crate's lib.rs, add the following preamble on top as well:

   #![deny(unsafe_op_in_unsafe_fn)]
   #![deny(missing_docs)]
   

Adding a new Dependency

1. At the top level:
   • Add it to [workspace.dependencies] specifying the version and any features that should be enabled throughout the workspace
2. In each member's Cargo.toml:
   • Add it to the desired dependencies section with workspace = true and no version specified.
   • If this member requires additional features, add only the extra features to the member dependency.

Updating a Dependency's Version

1. At the top level:
   • Bump the version in [workspace.dependencies] as desired.
   • Check for deprecations or breakage throughout the workspace.

Notes on Workspace Inheritance

Common metadata (like authors, license, ..) are inherited throughout the workspace. If new fields are added that are identical for all crates, they should be defined in the top-level Cargo.toml file's [workspace.package] section, and inherited in all members explicitly by setting FIELD.workspace = true in the member's [package] section.

Dependency information is also inherited throughout the workspace, allowing a single dependency specification in the top-level Cargo.toml file to be used by all members.

Some restrictions apply:

• features can only be added in members, never removed (this includes default_features = false!)
  • the base feature set at the workspace level should be the minimum (possibly empty!) set required by all members
• workspace dependency specifications cannot include optional
  • if needed, the optional flag needs to be set at the member level when using a workspace dependency