Guardrails / kotlin

Kotlin version is pinned

kotlin/kotlin-version-pinned@v1

The build declares the Kotlin compiler version, and it is no older than the configured floor.

Id	kotlin/kotlin-version-pinned
Version	v1
Category	kotlin
Default severity	warning
Interpreter	python3
Timeout	30 seconds
Violations tolerated	0
Collects	kotlin

Collectors

This guardrail doesn't gather anything itself. It relies on the collectors below, which the CLI runs once per build before any check, and reads what they found from GUARDRAIL_FACTS. If a collector collects nothing, this guardrail is skipped, not failed.

Collector	Gathers	Inputs it is given
kotlin	The Kotlin version the Gradle or Maven build declares and the file that declares it, for the project and for every Gradle project it includes.	projectDir

The inputs above are this guardrail's own inputs, passed straight through to the collector. Setting one in buildnote.json changes what is collected, and two guardrails configured the same way share a single collection.

Configuration

{
  "guardrails": {
      "failOn": "error",
      "checks": [
          {
              "use": "kotlin/kotlin-version-pinned@v1",
              "severity": "warning",
              "with": {
                  "projectDir": ".",
                  "minVersion": "1.8"
              },
              "exemptions": []
          }
      ]
  }
}

Inputs

Input	Description	Default	Environment variable
projectDir	Directory holding the project, relative to the directory the CLI runs in.	.	GUARDRAIL_INPUT_PROJECTDIR
minVersion	Oldest Kotlin version accepted. A pinned version below this is a violation.	1.8	GUARDRAIL_INPUT_MINVERSION

How to fix

Declare the compiler version where the build applies the Kotlin plugin. For example, use kotlin("jvm") version "2.4.0" in build.gradle.kts, a kotlin entry under [versions] in gradle/libs.versions.toml, or <kotlin.version> in pom.xml. Without it, the compiler version can drift between a laptop and CI.

More in kotlin

• kotlin/build-manifest. The project declares a recognised build manifest, so the build is reproducible and tooling can find it.
• kotlin/dependencies-locked. The Gradle build commits the lock files that resolve its dependencies, so the same commit builds from the same versions.
• kotlin/gradle-wrapper. A Gradle project commits gradlew and the wrapper properties that pin the Gradle version.

All 4 kotlin guardrails