👋 hi all. i have what i think is a simple question but i’m not sure how to phrase my googles properly as I’m fairly new to pants. I have a monorepo with a number of different Lambda functions. I’m using poetry to setup a

src

package structure for each lambda. Each lambda will (eventually) have a dependency on a library that we are also developing - I have also used poetry to set up the

src

layout for this library. In my

pants.toml

file I have my source roots defined as:

[source]
marker_filenames = ["pyproject.toml"]

I also went with a single lockfile for the repo because the number of third party dependencies across all of the Lambdas + shared library code is somewhat small (around 6 or so currently). My question is this - what’s the “standard practice” way to tell Pants that the Lambdas will have a shared dependency that’s in the same monorepo? ie - is this handled via BUILD file modification, or should I be doing something with

pyproject.toml

in the Lambda package directories (ie 1. specifying a local distribution, or 2. packaging the shared library up, sending it to our gitlab package registry, then listing this shared library as any other 3rd party dependency in pyproject.toml)

Pants should be able to automatically infer the dependency. for example, if you have a library lib0, in an app app0 you should just be able to write

import lib0

and Pants will pull in the lib0 source.

./pants dependencies

should show you if it's being picked up.

ah sorry that was meant to be my #3 - if it was as easy as just writing the import statements in the Lambda functions and Pants would do the rest

doing 2 is possible, but it's a bit weirder because the library is technically a different dependency world than the lambdas (since the lambdas depend on the shared lib but the shared lib doesn't depend on itself). So you could create 2 resolves (1 for the lib, 1 for the lambdas) and a python_distribution target for the lib. This can be useful for some compliance scenarios.

excellent thanks for that feedback re option 2. I will do some experimentation - thanks for pointing me in the right direction!