hello, I'm writing some custom tasks and would like to use output file from one task as an input to ...

# gradle

[Dariusz Kuc]

hello, I'm writing some custom tasks and would like to use output file from one task as an input to another -> resolved

[Dariusz Kuc]

open class MyCustomTask1 : DefaultTask() {

    @Input
    @Option(option = "outputFileName", description = "output file name")
    val outputFileName: Property<String> = project.objects.property(String::class.java)

    @OutputFile
    val outputFile: Provider<RegularFile> = outputFileName.flatMap { name -> project.layout.buildDirectory.file(name) }

    // actual task code omitted for clarity
}

open class MyCustomTask2 : DefaultTask() {

    @Input
    @Optional
    @Option(option = "inputFileName", description = "input file name")
    val inputFileName: Property<String> = project.objects.property(String::class.java)

    @Input
    @Optional
    val inputFile: RegularFileProperty = project.objects.fileProperty()

    // skipping code
}

While individual tasks worked fine I'm trying to configure task2 to use task1 output, e.g. in build.gradle.kts

val firstTask by tasks.getting(MyCustomTask1::class) {
  // configuration
}
val secondTask by tasks.getting(MyCustomTask2::class) {
    inputFile.set(firstTask.outputFile)

    dependsOn("firstTask")
}

unfortunately when run I'm hitting

Unable to store input properties for task .... Property 'inputFile' with value '/valid/path/to/task1/outputFile' cannot be serialized.

Any ideas?

[Dariusz Kuc]

problem was with task2 using @Input on RegularFileProperty it works when I updated it to @InputFile

[miqbaldc]

I might be wrong, but what happened when you prioritize dependsOn first then running your inputFile.set?

does your outputFile exist?

[Dariusz Kuc]

It correctly run task1 and generated its output

[Dariusz Kuc]

But faile don task2 with the serialization error

[Dariusz Kuc]

Fix was to use @InputFile instead of @Input

[miqbaldc]

nice, thanks for the answer