Publish jib-gradle plugin on jcenter/mavenCentral

[danielpetisme]

Description of the issue:
I'm trying to integrate jib into the vertx-gradle-plugin and when gradle tries to resolve jib-gradle-plugin as a dependency (not as a plugin) it fails to find the component in jcenter/mavenCentral (the common repos used for java dependencies).

The plugin seems only hosted on gradlePluginPortal().

I'm currently trying a workaround to programatically add the gradlePluginPortal() to the user build in order to properly resolve but it IMHO it looks bad.

Expected behavior:
The jib-gradle-plugin should be available in the common repos (BTW, the jib-maven-plugin is already present in jcenter() - https://bintray.com/bintray/jcenter/com.google.cloud.tools%3Ajib-maven-plugin)

Steps to reproduce:
Create a Gradle project and add jib-gradle-plugin as a dependency

jib-gradle-plugin Configuration:

repositories {
  jcenter()
  mavenCentral()
}

version = '0.0.1-SNAPSHOT'
group = 'com.acme'

dependencies {
...
  implementation 'com.google.cloud.tools.jib:com.google.cloud.tools.jib.gradle.plugin:0.9.10'
...
}

Log output:

Execution failed for task ':compileKotlin'.
> Could not resolve all files for configuration ':compileClasspath'.
   > Could not find com.google.cloud.tools.jib:com.google.cloud.tools.jib.gradle.plugin:0.9.10.
     Searched in the following locations:
       - https://jcenter.bintray.com/com/google/cloud/tools/jib/com.google.cloud.tools.jib.gradle.plugin/0.9.10/com.google.cloud.tools.jib.gradle.plugin-0.9.10.pom
       - https://jcenter.bintray.com/com/google/cloud/tools/jib/com.google.cloud.tools.jib.gradle.plugin/0.9.10/com.google.cloud.tools.jib.gradle.plugin-0.9.10.jar
       - https://repo.maven.apache.org/maven2/com/google/cloud/tools/jib/com.google.cloud.tools.jib.gradle.plugin/0.9.10/com.google.cloud.tools.jib.gradle.plugin-0.9.10.pom
       - https://repo.maven.apache.org/maven2/com/google/cloud/tools/jib/com.google.cloud.tools.jib.gradle.plugin/0.9.10/com.google.cloud.tools.jib.gradle.plugin-0.9.10.jar     
     Required by:
         project :

Additional Information:

[coollog]

Hi @danielpetisme, thanks for reporting this issue. Would adding the Gradle Plugin repo as a Maven repository work for your case?

repositories {
  maven {
    url "https://plugins.gradle.org/m2/"
  }
}

@loosebazooka

[danielpetisme]

hum... Looks live https://plugins.gradle.org/m2/ tries to fallback to jcenter (and fail)
I'm not sure of the difference between gradlePluginPortal() and maven { url "https://plugins.gradle.org/m2/" }

Do you have any clue?

[coollog]

Hmm, this might just be because using the Gradle plugin as a source code dependency is not a supported use case. We are currently actively working on building out Jib Core as a library, so once that is ready, we will publish it to Maven Central and you can use it as a library for the vertx-gradle-plugin. It will also be much easier to use since it will have a much more polished API than what you'll get by just depending on jib-gradle-plugin. The original issue is at #337 and the tracking project is https://github.com/GoogleContainerTools/jib/projects/7.

[coollog]

Hi @danielpetisme , we have released an initial alpha version of Jib Core. Let us know if it suits your use case.