build arguments for custom Dockerfile

README.md

@@ -36,6 +36,7 @@ Only `image` parameter is mandatory - it's name of the resulting image.
         arguments = ['--server'] // arguments to be passed to your application; default: empty
         dockerBuildDirectory = project.file('my-directory') // directory where Dockerfile is created; default: "$buildDir/dockerJava"
         customDockerfile = file('Dockerfile') // path to a custom Dockerfile - then all of the previous options (except image and alternativeImages) are ignored; default: null
+        buildArgs = ['version=1.2.3'] // build arguments to be send to 'docker build' command when using custom Dockerfile; default: empty
         // username and password are used if the Docker Registry requires credentials for pushing
         username = 'registry-username'
         password = System.getenv('DOCKER_REGISTRY_PASSWORD')

src/main/groovy/cz/augi/gradle/dockerjava/DistDockerTask.groovy

@@ -154,6 +154,7 @@ class DistDockerTask extends DefaultTask {
             def args = ['build', '-t', settings.image]
             settings.alternativeImages.each { args.addAll(['-t', it]) }
             args.addAll(['--file', settings.customDockerfile.name])
+            settings.buildArgs.each { args.addAll(['--build-arg', it]) }
             args.add(settings.customDockerfile.parentFile.absolutePath)
             dockerExecutor.execute(*args)
         } else {
@@ -199,4 +200,6 @@ interface DistDockerSettings {
     File getDockerBuildDirectory()
     @Input @Optional
     File getCustomDockerfile()
+    @Input @Optional
+    String[] getBuildArgs()
 }

src/main/groovy/cz/augi/gradle/dockerjava/DockerJavaExtension.groovy

@@ -26,6 +26,7 @@ class DockerJavaExtension implements DistDockerSettings, DockerPushSettings {
     String[] arguments = []
     File dockerBuildDirectory
     File customDockerfile
+    String[] buildArgs = []
 
     String username
     String password