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Frequently Asked Questions

How does Scala Steward decide what version it is updating to?

Scala Steward first proposes an update to the latest patch version at the same minor and major version. If the dependency is already on the latest patch version, it proposes an update to the latest minor version at the same major version. And if the dependency is already on the latest minor version, it proposes an update to the latest major version.

Here is an example. Suppose you are depending on a library foo, which has been published for the following versions: 1.0.0, 1.0.1, 1.0.2, 1.1.0, 1.2.0, 2.0.0, and 3.0.0.

  • If your version is 1.0.0 or 1.0.1, Scala Steward would create a PR updating it to 1.0.2
  • If your version is 1.0.2 or 1.1.0, Scala Steward would create a PR updating it to 1.2.0
  • If your version is 1.2.0 or 2.0.0, Scala Steward would create a PR updating it to 3.0.0

Of course, once you merge a Scala Steward PR, you've updated your version, which can result in Scala Steward sending another PR making the next update.

How can version updates be controlled

You can control the update of individual dependencies or of all dependencies belonging to a group by specifying version prefixes for them:

updates.pin = [
  # Allow x.y to x.(y+1), but not to (x+1).y
  { groupId = "a.group.id", artifactId="a.name", version="x." },
  # Allow x.y.z to x.y.(z+1), but not to x.(y+1)
  { groupId = "a.group.id", artifactId="another.name", version="x.y." }


  # Fix the major version for all dependencies with this groupId
  { groupId = "a.group.id", version="x." },
]

Updates for sbt and scalafmt can be controlled by using the following groupId and artifactId:

{ groupId = "org.scala-sbt", artifactId = "sbt" }
{ groupId = "org.scalameta", artifactId = "scalafmt-core" }

Can Scala Steward update dependencies in giter8 templates ?

Scala Steward can update versions in giter8 templates if the dependencies of the template are also added as dependencies of the template build. An example is library.g8 (example PR)

Why do Scala Steward updates provide no URLs in PRs

Scala Steward updates can only provide links to release notes, diffs and changelogs if the ivy.xml file contain the homepage attribute or the pom.xml contains either a scm.url or an url attribute.

How can Scala Steward's PRs be merged automatically?

You can use Mergify to automatically merge Scala Steward's pull requests. Mergify rules that does this can be found in Scala Steward's own repository here. Mergify can also be configured to only merge patch updates (in case the version number adheres to Semantic Versioning) as demonstrated here.

Other examples of Mergify rules for Scala Steward can be found via GitHub's code search.

Where can Scala Steward's PGP key be found?

Scala Steward signs commits with a PGP key. The fingerprint of that key is 774C3674392662AE645C9B8396BDF10FFAB8B6A6 and it can be found at https://keys.openpgp.org/[email protected].

How can I change log levels?

If you want to switch from the standard INFO log level you can call scala steward with -DLOG_LEVEL=DEBUG for example: scala-steward -DLOG_LEVEL=DEBUG --workspace "$STEWARD_DIR/workspace" ...