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Update docs for how cargo is published #14539

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Update docs for how cargo is published
ehuss committed Sep 11, 2024
commit b9b187376a43aed0e0a974c8d21bd97c59ec4aaa
33 changes: 17 additions & 16 deletions src/doc/contrib/src/process/release.md
Original file line number Diff line number Diff line change
@@ -26,7 +26,7 @@ Every night at 00:00 UTC, the artifacts from the most recently merged PR are
promoted to the nightly release channel. A similar process happens for beta
and stable releases.

[`dist` bootstrap module]: https://github.com/rust-lang/rust/blob/master/src/bootstrap/dist.rs
[`dist` bootstrap module]: https://github.com/rust-lang/rust/blob/master/src/bootstrap/src/core/build_steps/dist.rs

## Submodule updates

@@ -123,38 +123,39 @@ stable) and the release-specific URL such as
The code that builds the documentation is located in the [`doc` bootstrap
module].

[`doc` bootstrap module]: https://github.com/rust-lang/rust/blob/master/src/bootstrap/doc.rs
[`doc` bootstrap module]: https://github.com/rust-lang/rust/blob/master/src/bootstrap/src/core/build_steps/doc.rs

## crates.io publishing

Cargo's library and its related dependencies (like `cargo-util`) are published
to [crates.io] as part of the 6-week stable release process by the [Release
team]. There is a [`publish.py` script] that is used by the Release team's
automation scripts (see <https://github.com/rust-lang/simpleinfra/>) to handle
determining which packages to publish. The build tool crates aren't published.
This runs on the specific git commit associated with the cargo submodule in the
`stable` branch in `rust-lang/rust` at the time of release.
team]. The release process involves a series of steps:

1. The Release team's automation scripts (see <https://github.com/rust-lang/simpleinfra/>) will run [`promote-release`] which will create a tag in the `rust-lang/cargo` repository associated with the version of the cargo submodule for that release.
2. The creation of a tag will trigger the [release workflow] in `rust-lang/cargo`.
3. The release workflow will run the [`publish.py` script] on the commit associated with the tag.
4. The `publish.py` script will run `cargo publish` on any crates that are not already published.

[`promote-release`]: https://github.com/rust-lang/promote-release
[release workflow]: https://github.com/rust-lang/cargo/blob/master/.github/workflows/release.yml

On very rare cases, the Cargo team may decide to manually publish a new
release to [crates.io]. For example, this may be necessary if there is a
problem with the current version that only affects API users, and does not
affect the `cargo` binary shipped in the stable release. In this situation,
PRs should be merged to the associated stable release branch in the cargo repo
(like `rust-1.70.0`) that fix the issue and bump the patch version of the
affected package. Then someone with permissions (currently a subset of the
Cargo team, or the Release team) should publish it manually using `cargo
publish`.
affected package. Then you need to work with the Release Team to get a release
published to crates.io.[^release-problem]

Some packages are not published automatically because they are not part of the
Rust release train. This currently only includes the [`home`] package. These
are published manually on an as-needed or as-requested basis by whoever has
permissions (currently [@ehuss] or the Release/Infra team).
permissions (currently [@ehuss] or the Release/Infra team)[^fix-manual-release].

[^release-problem]: Unfortunately there are some complications with this process. See <https://github.com/rust-lang/cargo/issues/14538> for more detail, and thoughts on how to improve this.

In the future, these manual publishing options should be integrated with
GitHub Actions so that any team member can trigger them. Likely that should
involve getting Infra to create scoped tokens that can be added as GitHub
Secrets, and setting up GitHub Actions workflows with the appropriate
permissions which can be manually triggered to launch a release.
[^fix-manual-release]: This should be fixed, see [crate ownership policy](https://forge.rust-lang.org/policies/crate-ownership.html) about removing ownership. Also see <https://github.com/rust-lang/cargo/issues/14538> for problems with tagging. In general, these should be published from GitHub Actions, but we don't have the infrastructure set up for that, yet.

[`home`]: https://github.com/rust-lang/cargo/tree/master/crates/home
[`publish.py` script]: https://github.com/rust-lang/cargo/blob/master/publish.py