fix(kmp): derive the snapshot version without blocking the configuration cache

[jamesarich]

packages/kmp currently cannot be built with --configuration-cache at all:

* What went wrong:
Configuration cache problems found in this build.

1 problem was found storing the configuration cache.
- Build file 'build.gradle.kts': external process started 'git describe --tags --abbrev=0'
> Starting an external process 'git describe --tags --abbrev=0' during configuration
  time is unsupported.

The VERSION_NAME fallback — which patch-bumps the latest git tag for local
snapshot builds — started git through ProcessBuilder directly. Gradle rejects
that outright under the configuration cache.

The change

Use providers.exec instead. It is the configuration-cache-aware equivalent:
the invocation is recorded as a configuration-cache input rather than being an
unsupported side effect.

Behaviour is unchanged, including both degradation paths:

• the runCatching wrapper still covers a missing git binary;
• isIgnoreExitValue = true keeps a tagless or shallow clone on the existing
  0.0.1-SNAPSHOT path instead of failing configuration.

Verification

Command	Before	After
./gradlew help --configuration-cache	FAILED	entry stored, then reused
./gradlew build --configuration-cache	FAILED	BUILD SUCCESSFUL, 79 tasks
derived version	2.7.27-SNAPSHOT	2.7.27-SNAPSHOT (identical)

Scope

This only unblocks the configuration cache — it does not enable it.
gradle.properties still leaves it off, so nothing changes for CI or for
anyone not passing the flag. Turning it on is a separate call, worth making
once there is Build Scan data to measure the win (see #1027).

Found while onboarding this repo to Develocity (#1027); the CC-reuse check in
that PR's verification could not be run because of this.

Summary by CodeRabbit

• Bug Fixes
  • Improved version detection for tagless and shallow repository checkouts.
  • Builds now continue using fallback versioning when Git tag lookup is unavailable or unsuccessful.

[github-actions]

The latest Buf updates on your PR. Results from workflow pull-request / build (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Aug 2, 2026, 11:45 PM

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 8b20e25b-758d-43ea-ba70-c47b756f71af

📥 Commits

Reviewing files that changed from the base of the PR and between 6ceceae and 807b445.

📒 Files selected for processing (1)

• packages/kmp/build.gradle.kts

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📝 Walkthrough

Walkthrough

The build script now uses Gradle’s providers.exec to run git describe from the repository root. It records the command as a configuration-cache input and retains fallback behavior when Git returns no tag or a nonzero status.

Changes

Git version lookup

Layer / File(s)	Summary
Provider-based Git tag lookup packages/kmp/build.gradle.kts	The script replaces ProcessBuilder with providers.exec, preserves repository-root execution, and ignores nonzero exit statuses before applying the fallback version logic.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: deriving snapshot versions without blocking the configuration cache.
Description check	✅ Passed	The description clearly covers the problem, solution, preserved fallback behavior, verification results, and scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/kmp-configuration-cache

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 Checkov (3.3.8)

packages/kmp/build.gradle.kts

Checkov skipped this file: it was unavailable in the sandbox worktree

🔧 detekt (1.23.8)

packages/kmp/build.gradle.kts

Exception in thread "main" com.beust.jcommander.ParameterException: Provided path 'packages/kmp/build.gradle.kts' does not exist!
at io.gitlab.arturbosch.detekt.cli.ExistingPathConverter.convert(ArgumentConverters.kt:16)
at io.gitlab.arturbosch.detekt.cli.ExistingPathConverter.convert(ArgumentConverters.kt:11)
at io.gitlab.arturbosch.detekt.cli.DetektInputPathConverter$DefaultImpls.convert$lambda$1(ArgumentConverters.kt:31)
at kotlin.sequences.TransformingSequence$iterator$1.next(Sequences.kt:210)
at kotlin.sequences.SequencesKt___SequencesKt.toList(_Sequences.kt:815)
at io.gitlab.arturbosch.detekt.cli.DetektInputPathConverter$DefaultImpls.convert(ArgumentConverters.kt:32)
at io.gitlab.arturbosch.detekt.cli.MultipleExistingPathConverter.convert(ArgumentConverters.kt:41)
at io.gitlab.arturbosch.detekt.cli.CliArgs.inputPaths_delegate$lambda$0(CliArgs.kt:193)
at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
at io.gitlab.arturbosch.detekt.cli.CliArgs.getInputPaths(CliArgs.kt:192)
at io.gitlab.arturbosch.detekt.cli.SpecKt.createSpec$lambda$15$lambda$1(Spec.kt:18)
at io.github.detekt.tooling.dsl.ProcessingSpecBuilder.project(ProcessingSpecBuilder.kt:37)
at io.gitlab.arturbosch.detekt.cli.SpecKt.createSpec$lambda$15(Spec.kt:16)
at io.github.detekt.tooling.dsl.ProcessingSpecBuilderKt.processingSpec(ProcessingSpecBuilder.kt:15)
at io.github.detekt.tooling.api.spec.ProcessingSpec$Companion.invoke(ProcessingSpec.kt:23)
at io.gitlab.arturbosch.detekt.cli.SpecKt.createSpec(Spec.kt:9)
at io.gitlab.arturbosch.detekt.cli.runners.Runner.(Runner.kt:20)
at io.gitlab.arturbosch.detekt.cli.CliRunner.run(CliRunner.kt:31)
at io.gitlab.arturbosch.detekt.cli.CliRunner.run(CliRunner.kt:14)
at io.gitlab.arturbosch.detekt.cli.Main.main(Main.kt:20)

---

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