Provide a way to use kotlin-dsl in precompiled script plugins

[vlsi]

Expected Behavior

There should be a way to use kotlin-dsl for precompiled script plugins in idiomatic-gradle approach.

Current Behavior

I try using precompiled script plugins to factor the build logic.
In the build itself, I need kotlin-dsl plugin (so I do not apply kotlin-dsl everywhere, and I want an uber-plugin to apply it along with other plugins)

Of course, precompiled script plugins forbid versions, so I have the following for Gradle 6.8.3:

dependencies {
  implementation("org.gradle.kotlin.kotlin-dsl:org.gradle.kotlin.kotlin-dsl.gradle.plugin:1.4.9")

Unfortunately, it breaks for Gradle 7 as follows:

> Configure project :
This version of Gradle expects version '2.1.4' of the `kotlin-dsl` plugin but version '1.4.9' has been applied to root project 'allure-gradle-sandbox'. Let Gradle control the version of `kotlin-dsl` by removing any explicit `kotlin-dsl` version constraints from your build logic.
WARNING: Unsupported Kotlin plugin version.
The `embedded-kotlin` and `kotlin-dsl` plugins rely on features of Kotlin `1.4.31` that might work differently than in the requested version `1.4.20`.
kotlin-dsl verison is 2.1.4

Note: if I completely remove the version of org.gradle.kotlin.kotlin-dsl:org.gradle.kotlin.kotlin-dsl.gradle.plugin dependency, then Gradle can't find the version. If I leave an old version, Gradle complains that it wants a specific one.

Context

I cannot use a project that uses Gradle 6.8 (e.g. Gradle plugin project) as an includedBuild in project that uses Gradle 7 since Gradle 7 wants every version to be "new and shiny", so it requests "removing any explicit kotlin-dsl version constraints", however it is not clear how it should be done.

[vlsi]

Currently I use the following workaround to fetch kotlin-dsl version 🤯

val kotlinDslVersion = PluginDependenciesSpec { id ->
    object : PluginDependencySpec {
        var version: String? = null
        override fun version(version: String?) = apply { this.version = version }
        override fun apply(apply: Boolean) = this
        override fun toString() = version ?: ""
    }
}.`kotlin-dsl`.toString()

[jjohannes]

This is definitely an issue. It should be addressed as part of #15219.

[mochadwi]

this also happened for me in 6.8.3

[kikoso]

This does not seem to have been tackled yet. @jjohannes , do you have any update here?

[jjohannes]

@kikoso sorry I am no longer in the Gradle team and I don't know what the timeline for this is.

I still think this should be addressed as it is a quite common issue that affects builds using a "modern" structuring approach for build logic.

[kikoso]

Thanks for the heads up @jjohannes !

[vlsi]

I recently tried again, and I found org.gradle.kotlin.dsl.support.expectedKotlinDslPluginsVersion property, so the following works in Gradle 7.6:

import org.gradle.kotlin.dsl.support.expectedKotlinDslPluginsVersion

dependencies {
    implementation("org.gradle.kotlin.kotlin-dsl:org.gradle.kotlin.kotlin-dsl.gradle.plugin:$expectedKotlinDslPluginsVersion")
}

It would still be nice to have something like

dependencies {
    implementation(kotlinDsl())
}