Releasing geckodriver ===================== Releasing geckodriver is not as easy as it once used to be when the project’s canonical home was on GitHub. Today geckodriver is hosted in [mozilla-central], and whilst we do want to make future releases from [Mozilla’s CI infrastructure], we are currently in between two worlds: development happens in m-c, but releases continue to be made from GitHub using Travis. The reason for this is that we do not compile geckodriver for all our target platforms, that Rust cross-compilation on TaskCluster builders is somewhat broken, and that tests are not run in automation. We intend to fix all these problems. In any case, the steps to release geckodriver are as follows: [mozilla-central]: https://hg.mozilla.org/mozilla-central/ [Mozilla’s CI infrastructure]: https://treeherder.mozilla.org/ Release new webdriver crate --------------------------- geckodriver depends on the [webdriver] crate, also hosted in mozilla-central, by pointing to its in-tree relative path: [dependencies] webdriver = { path = "../webdriver" } Because we need to export the geckodriver source code to the old GitHub repository in order to release, we need to publish any changes that have been made to webdriver in the interim. If no changes have been made, you can skip these steps: 1. Bump the version number in testing/webdriver/Cargo.toml 2. `cargo publish` [webdriver]: ../webdriver Update the change log --------------------- Notable changes to geckodriver are mentioned in [CHANGES.md]. Many users rely on this, so it’s important that you make it **relevant to end-users**. For example, we only mention changes that are visible to users. The change log is not a complete anthology of commits, as these often will not convey the essence of a change to end-users. If a feature was added but removed before release, there is no reason to list it as a change. It is good practice to also include relevant information from the [webdriver] and [rust-mozrunner] crates, since these are the two most important dependencies of geckodriver and a lot of its functionality is implemented there. We follow the writing style of the existing change log, with one section per version (with a release date), with subsections ‘Added’, ‘Changed’, and ‘Removed’. If the targetted Firefox or Selenium versions have changed, it is good to make a mention of this. Lines are optimally formatted at roughly 72 columns to make the file readable in a text editor as well as rendered HTML. fmt(1) does a splendid job at text formatting. [CHANGES.md]: ../CHANGES.md [webdriver]: ../../webdriver [rust-mozrunner]: https://github.com/jgraham/rust_mozrunner Update libraries ---------------- Make relevant changes to [Cargo.toml] to upgrade dependencies, then run % ./mach vendor rust % ./mach build testing/geckodriver to pull down and vendor the upgraded libraries. Remember to check in the [Cargo.lock] file, since unlike we want geckodriver builds to be reproducible. Updating dependencies should always be made as a separate commit to not confuse reviewers because vendoring involves checking in a lot of extra code reviewed downstream. [Cargo.toml]: ../Cargo.toml [Cargo.lock]: ../Cargo.lock Bump the version number ----------------------- Bump the version number in [Cargo.toml] to the next version. geckodriver follows [semantic versioning] so it’s a good idea to familiarise yourself wih that before deciding on the version number. After you’ve changed the version number, run % ./mach build testing/geckodriver again to update [Cargo.lock], and check in the file. [semantic versioning]: http://semver.org/ Export to GitHub ---------------- The canonical GitHub repository is https://github.com/mozilla/geckodriver.git so make sure you have a local clone of that. It has three branches: _master_ which only contains the [README.md]; _old_ which was the state of the project when it was exported to mozilla-central; and _release_, from where releases are made. We will export the contents of [testing/geckodriver] to the latter branch: % cd $SRC/geckodriver % git checkout release % git rm -rf . % git clean -fxd % cp -r $SRC/gecko/testing/geckodriver/* . [README]: ../README.md [testing/geckodriver]: ../ Manually change `webdriver` dependency -------------------------------------- After the source code has been imported we need to change the dependency information for the [webdriver] crate. As explained previously geckodriver depends on a relative path in in the mozilla-central repository to build with the latest unreleased source code. This relative path does not exist in the GitHub repository and the build will fail unless we change it to the latest [webdriver] crate version from crates.io. That version will either be the crate you published earlier, or the latest version available if no changes have been made to it since the last geckodriver release. Commit local changes -------------------- Now commit all the changes you have made locally to the _release_ branch: % git add . % git commit -am "import of vX.Y.Z" As indicated above, the changes you make to this branch will not be upstreamed back into mozilla-central. It is merely used as a staging ground for pushing builds to Travis. Tag the release --------------- Run the following command to tag the release: % git tag 'vX.Y.Z' Make the release ---------------- geckodriver is released and automatically uploaded from Travis by pushing a new version tag to the _release_ branch: % git push % git push --tags Update the release description ------------------------------ Copy the raw Markdown source from [CHANGES.md] into the description of the [latest release]. This will highlight for end-users what changes were made in that particular package when they visit the GitHub downloads section. Congratulations! You’ve released geckodriver! [latest release]: https://github.com/mozilla/geckodriver/releases Future work ----------- In the future, we intend to [sign releases] so that they are verifiable. [sign releases]: https://github.com/mozilla/geckodriver/issues/292