Can you run a task multiple times with different system parameters in gradle?

Question

So I have a project where I want to run a task multiple times with a different value for a system parameter each time, however I can't seem to do that short of calling gradle multiple times in a bash script which is not desirable. I tried ./gradlew myTask -Dproperty="value1" myTask -Dproperty="value2" which ran myTask twice, which was good, but it ran with property=value2 both times. Is there any way to do this?

Edit: I should also mention that I do not know value1 and value2 until buildtime. So I can't hardcore them into the build script.

Answer 1

Check out the following approach:

task executeTaskTwiceWithParameters {
    String[] propertyValues = System.getProperty("propertyValues" ,"").split(",")
    dependsOn propertyValues.collect { "runWith$it" }
    propertyValues.each { value ->
        task "runWith$value"(type: GradleBuild) {
            buildFile = 'build.gradle'
            tasks = ['doSomething']
            startParameter.systemPropertiesArgs += [property: value]
        }
    }
}

task doSomething {
    doLast {
        println System.getProperty("property")
    }
}

When invoked like

./gradlew executeTaskTwiceWithParameters -DpropertyValues=value1,value2

for each property value it launches an auxiliary gradle build to execute a task with this property value set. The same trick works for project properties as well.