hey devs. I can’t find if we already do this anywhere else in Pants. I have a list of files from

hydrated_sources.snapshot.files

. Now I’d like to copy them (while preserving the inner directory hierarchy) into a new, temporary directory that needs to exist on disk. I’ll need to pass that directory path to a binary tool. Can I access such a location in some temporary build directory somewhere?

The

Digest

for those source files would be passed as the

input_digest

of the

Process

used to invoke the the binary tool.

Also used in the docker backend for the docker build context..

oh thanks @fast-nail-55400! Sorry, I wasn’t clear. I already use the

.digest

and it works great. I was thinking about the use case where I have files

foo/dir/bar.txt

and

baz/dir/qwe.txt

(as part of the digest). Now I wanted to merge them onto

result/dir

directory containing both

bar.txt

and

qwe.txt

so that I could pass

result

directory name to the

Process

. After experimenting, I feel it may be unnecessary, but since I’ve asked, it would be handy to know whether there is an easy/sensible way to achieve that.

You can use

AddPrefix

and other digest manipulation types to modify the digest.

Yeah,

Digest

is the "handle" around those files. See https://www.pantsbuild.org/docs/rules-api-file-system for how you can do things like rename files