Is it possible to throw an error if no arguments are provided to Gradle? - gradle

Question

My gradle setup accepts arguments during runtime which are checked in a shell script that Gradle Exec task calls. However, in order to reach that point, Gradle deals with dependencies and spends a good amount of time before the end script is executed, which would then throw an error if no arguments are passed.
Build task in gradle looks like below:
task buildAll(type: Exec) {
environment['PROJECT_ROOT'] = "${projectDir}"
workingDir rootProject.projectDir.path
executable rootProject.projectDir.path + "/script.ksh"
if (project.hasProperty('ARGS')) {
args(ARGS.split(','))
}
}
Gradle is called as follows:
./gradlew build -PARGS="-arg1,value1,-arg2,value2,-arg3,-arg4,value4"
I intend to check for -arg2 and if it is not provided, I would like the gradle build to fail with some sort of usage displayed. Is this possible?

Answer 1

You can add an if block at the very beginning of the script:
if (!project.hasProperty('lol')) {
throw new GradleException("'lol' property is required!")
}
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.google.guava:guava:18.0'
}
}
however it will not prevent gradle from resolving the dependencies of the script itself - buildscript block will be evaluated first.