OK, I think I've finally gotten stuck on how to do something in the new engine. I'm running

coursier fetch

, which returns me a report on which jars were fetched and the absolute paths where they were fetched. They're fetched into a subdir of

global_options.options.named_caches_dir

. But now I want to gather up only the jars that were relevant to this resolve into a

Digest

where the jars have been flattened out (or at least have the named cache prefix trimmed off). AFAICT the only way to do this would be with

PathGlobs

, but it only works on paths relative to the build root. Is there some other way to capture arbitrary files from known locations on disk into a

Digest

?

Maybe

RemovePrefix

would help? https://github.com/pantsbuild/pants/blob/64a69b8e1f596308895153222c2b5e1377ccd5d3/src/python/pants/engine/fs.py#L216

Is there some other way to capture arbitrary files from known locations on disk into a 

Digest

?

the

named_caches

are only intended to be accessible from inside of

Process

runs: so running a process that copies the files out of the named_caches and into its own directory, where they can be captured using the

output_directories

or

output_files

of the

Process

would be the right way to go about it probably

Yeah Tom (also, hey!), I was trying to get to the point of using

RemovePrefix

, but you need to get to a

Digest

first, which is where I was stuck.

I suppose I just trust that the CAKVS is smart enough to deduplicate individual jars that get slurped in from the named cache

exactly: it ignores timestamps and filenames

Ah thanks, I did indeed base my code off of the changed PEX code