Gradle Publish to Maven repository hosted on Git

instructions.md

Instructions

Put the publish.gradle.kts file next to your build.gradle.

Edit the RepoURL and RepoBranch properties. (each time you change these, make sure to delete the build/maven folder!)

Add apply from: 'publish.gradle.kts' (Groovy) or apply { from("publish.gradle.kts") } (Kotlin) to your build.gradle.

Test if everything works by executing the updateLocalRepo task, there should now be a git repository in build/maven.

Execute the publish task to publish! It'll handle everything git-related for you.

publish.gradle.kts

// Git Publish v1.0.4
// by therealfarfetchd

import org.gradle.jvm.tasks.Jar

// Set this to whatever Git repository you want. You must be able to push to it.
val RepoURL = "ssh://git@github.com/therealfarfetchd/maven.git"
val RepoBranch = "master"

val LocalRepoURL = File(buildDir, "maven")

buildscript {
  val kotlin_version: String? by extra
  repositories { mavenCentral() }
  dependencies { classpath(kotlin("gradle-plugin", kotlin_version ?: "1.2.41")) }
}

plugins { java }
apply { plugin("maven-publish") }

val sourcesJar by tasks.creating(Jar::class) {
  classifier = "sources"
  from(the<JavaPluginConvention>().sourceSets["main"].allSource)
}

configure<PublishingExtension> {
  repositories {
    maven { url = LocalRepoURL.toURI() }
  }
  (publications) {
    "mavenJava"(MavenPublication::class) {
      from(components["java"])
      artifact(sourcesJar)
    }
  }
}

tasks {
  "setupLocalRepo"(Exec::class) {
    group = "git"
    onlyIf { !LocalRepoURL.exists() }
    LocalRepoURL.parentFile.mkdirs()
    commandLine = listOf("git", "clone", RepoURL, "-b", RepoBranch, LocalRepoURL.path)
  }

  "updateLocalRepo"(Exec::class) {
    group = "git"
    dependsOn("setupLocalRepo")
    workingDir = LocalRepoURL
    commandLine = listOf("git", "pull")
  }

  "addFilesLocal"(Exec::class) {
    group = "git"
    dependsOn("setupLocalRepo")
    workingDir = LocalRepoURL
    commandLine = listOf("git", "add", ".")
  }

  "commitFilesLocal"(Exec::class) {
    group = "git"
    dependsOn("addFilesLocal")
    workingDir = LocalRepoURL
    commandLine = listOf("git", "commit", "-m", "Build ${project.name}")
  }

  "updateRemoteRepo"(Exec::class) {
    group = "git"
    dependsOn("commitFilesLocal")
    workingDir = LocalRepoURL
    commandLine = listOf("git", "push")
  }

  "publish" {
    dependsOn("updateLocalRepo")
    finalizedBy("updateRemoteRepo")
    mustRunAfter("updateLocalRepo")
  }
}