Hello! A quick plugin question - is it possible to supply input on stdin to a

Process

?

It is not, other than an

InteractiveProcess

where the user supplies that input What's the use case, if you're able to share?

i"m trying to containerize an application and I was thinking it'd be nice to pipe the dockerfile into

docker build

? I think I can write it out into the root of the process digest though?

I think I can write it out into the root of the process digest though?

Yeah, I would recommend doing that. To start, you can use `PathGlobs`: https://www.pantsbuild.org/docs/rules-api-file-system#pathglobs Likely more scalable for a docker plugin is to create a

docker

target type with a

sources

field https://www.pantsbuild.org/docs/rules-api-and-target-api#the-sources-field, which under-the-hood is using

PathGlobs

Then, you'll put this digest into

input_digest

on the Process, and your argv can refer to it becuase that file will be present in the chroot

neat thanks! I wasn't in that channel but I just joined

Ah, there, you will use

To capture output files from the process, set output_files: Iterable[str] and/or output_directories: Iterable[str]. Then, you can use the ProcessResult.output_digest field to get a Digest of the result.

You likely need to then use

MergeDigests

to get a single digest from all the different ones you're accumulating

maybe I misunderstand but I don't think I want the dockerfile as an output - it's ephemoral & generated on the target. Then I'd want to run

docker build

as a process to create the image? Does that make sense

we could support propagating some fixed stdin to a

Process

locally, but it isn’t supported in remote execution… so yea, using a file is a good idea. it’s also possible to imitate it by spawning a shell and piping file contents into the process you’re trying to launch