I have a task that uses a RegularFileProperty as input that should consume 1 file from a resolvable configuration (that only produces 1 file). What’s the best way to support lazy configurations? As a workaround I could use ConfigurableFileCollection as task input but the task only supports 1 file so I would like to keep a RegularFile.

That came up just yesterday: https://gradle-community.slack.com/archives/CAHSN3LDN/p1745939774532999?thread_ts=1745824941.055489&cid=CAHSN3LDN

Exactly, that's the snippet I posted yesterday. 😄

Would love to keep the task dependencies…

Yeah, use the last snippet and it should be fine

But what about this:

myFile.set(configuration.flatMap { it.elements.map { it.single() as RegularFile } })

Actually, you need a

flatMap

yes, as

configuration

is a provider in your case, so the snippet was not fully working for you.

Well, it is a published file so it can’t be a directory 🤔 and elements returns a FileSystemLocation

I gave it a quick test and it is exactly like I said.

c.map { it.singleFile }

misses task dependency

layout.file(c.flatMap { it.elements.map { it.single().asFile } })

and

c.flatMap { it.elements.map { it.single() as RegularFile } }

preserve the task dependency But

c.flatMap { it.elements.map { it.single() as RegularFile } }

fails when you try to query the files with

> class org.gradle.api.internal.file.DefaultFileSystemLocation cannot be cast to class org.gradle.api.file.RegularFile (org.gradle.api.internal.file.DefaultFileSystemLocation and org.gradle.api.file.RegularFile are in unnamed module of loader org.gradle.internal.classloader.VisitableURLClassLoader @66133adc)

Thank you!