Making a libsignal release

0. Make sure all CI tests are passing on the latest commit

Check GitHub to see if the latest commit has all tests passing, including the nightly "Slow Tests". If not, fix the tests before releasing! (You can run the Slow Tests manually under the repository Actions tab on GitHub.)

1. Update the library version

The first version component should always be 0, to indicate that Signal does not promise stability between releases of the library.

A change is "breaking" if it will require updates in any of the Signal client apps or server components, or in external Rust clients of libsignal-protocol, zkgroup, poksho, attest, device-transfer, or signal-crypto. If there are any breaking changes, increase the second version component and reset the third to 0. Otherwise, increase the third version component.

bin/update_versions.py 0.x.y
cargo check --workspace # make sure Cargo.lock is updated

2. Record the code size for the Java library

On GitHub, under the Java tests for the most recent commit, copy the code size computed in the "java/check_code_size.py" step into a new entry in java/code_size.json.

3. Commit the version change and tag with release notes

git commit -am 'Bump to version v0.x.y'
git tag -a v0.x.y

Take a look at a past release for examples of the format:

v0.8.3

- Fixed several issues running signal-crypto operations on 32-bit
  platforms.
- Removed custom implementation of AES-GCM-SIV, AES, AES-CTR, and
  GHash in favor of the implementations from RustCrypto. The interface
  presented to Java, Swift, and TypeScript clients has not changed.
- Updated several Rust dependencies.
- Java: Exposed the tag size for Aes256GcmDecryption.

(You might think repeating the version number in the summary field is redundant, but GitHub shows it as a title.)

4. Push the version bump and tag to GitHub

Note that both the tag and the branch need to be pushed.

5. Tag signalapp/boring if needed

If the depended-on version of boring has changed (check Cargo.lock), tag the commit in the public signalapp/boring repository.

# In the checkout for signalapp/boring
git tag -a libsignal-v0.x.y -m 'libsignal v0.x.y' BORING_COMMIT_HASH
git push origin libsignal-v0.x.y

6. Submit to package repositories as needed

Android: Sonatype

Wait for the "Publish JNI Artifacts to GitHub Release" action to complete. These artifacts, though not built reproducibly, will be included in the libsignal-client and libsignal-server jars to support running on macOS and Windows as well.
Set the environment variables SONATYPE_USERNAME, SONATYPE_PASSWORD, KEYRING_FILE, SIGNING_KEY, and SIGNING_KEY_PASSSWORD.
Run make -C java publish_java to build through Docker.

Note that Sonatype is pretty slow; even after the build completes it might take a while for it to show up.

Node: NPM

In the signalapp/libsignal repository on GitHub, run the "Publish to NPM" action on the tag you just made. Leave the "NPM Tag" as "latest".

iOS: Build Artifacts

In the signalapp/libsignal repository on GitHub, run the "Build iOS Artifacts" action on the tag you just made. Share the resulting checksum with whoever will update the iOS app repository.

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