Remove docker plugin dependency

README.md

@@ -23,7 +23,7 @@ just pick a library for a server, a library for JDBC or whatever, a library for
 Far too often I have seen services with high unit test coverage percentage fail to even start up when assembled for deployment.
 
 Configures a reproducible build that packages the Java application (using Gradle's core `application` plugin)
-in a tar file and configures the [`docker`](https://github.com/bmuschko/gradle-docker-plugin) plugin for further
+in a tar file and configures a `docker` task for further
 packaging of the built artifact into a docker image.
 The resulting docker image will be tagged with `${rootProject.name}:snapshot` and you can then
 retag it after the build and push it to some docker registry for deployment.

plugins/build.gradle

@@ -4,17 +4,13 @@ plugins {
 }
 
 group = "io.github.rieske.java-service-gradle-plugins"
-version = "1.0.0"
+version = "1.1.0"
 
 tasks.named("test") {
     useJUnitPlatform()
 }
 
 dependencies {
-    // TODO: 9.1.0 seems to hang on Java 11
-    //implementation("com.bmuschko:gradle-docker-plugin:9.1.0")
-    implementation("com.bmuschko:gradle-docker-plugin:9.0.1")
-
     testImplementation(platform("org.spockframework:spock-bom:2.3-groovy-3.0"))
     testImplementation("org.spockframework:spock-core")
 }

plugins/src/main/groovy/io.github.rieske.java-service.gradle

@@ -1,6 +1,5 @@
 plugins {
     id("application")
-    id("com.bmuschko.docker-remote-api")
 }
 
 def dockerfile = layout.projectDirectory.file("Dockerfile")
@@ -12,10 +11,12 @@ def prepareDockerContextTask = tasks.register("prepareDockerContext", Copy) {
     from(dockerfile)
 }
 
-def dockerTask = tasks.register("docker", com.bmuschko.gradle.docker.tasks.image.DockerBuildImage) {
+def dockerTask = tasks.register("docker", Exec) {
     dependsOn(prepareDockerContextTask)
-    inputDir.set(dockerContextDir)
-    images.add("${rootProject.name}:snapshot".toString())
+    inputs.files(dockerfile, applicationTarArchive).withPathSensitivity(PathSensitivity.RELATIVE)
+    workingDir = dockerContextDir
+    commandLine = ["docker", "build", "-t", "${rootProject.name}:snapshot", "."]
+    outputs.dir(dockerContextDir)
 }
 
 testing.suites {

plugins/src/test/groovy/io/github/rieske/JavaServicePluginTest.groovy

@@ -108,7 +108,7 @@ class JavaServicePluginTest extends PluginTest {
 
         then:
         result.task(":docker").outcome == TaskOutcome.FAILED
-        result.output.contains("> Dockerfile does not exist")
+        result.output.contains("build/docker/Dockerfile: no such file or directory")
         result.task(":blackBoxTest") == null
     }