Hi, I need some advice/best practices on how to work with resolves for shared code. In my repo, i have 40-50 files which form shared library, which till yet were using default resolve. Now i have 2 main files(2 pex_binary) which use 2 different resolve(say

ai-cpu

and

ai-gpu

). my resolves looks like:

python_requirements(
    name="reqs",
    resolve=parametrize("python-default", "ai-gpu", "ai-cpu"),
)
python_requirements(
    name="ai-gpu",
    source="ai-gpu-requirements.txt",
    resolve="ai-gpu",
)

python_requirements(
    name="ai-cpu",
    source="ai-cpu-requirements.txt",
    resolve="ai-cpu",
)

Based on docs,

If a first-party target is compatible with multiple resolves, e.g., shared utility code, you can use the parametrize mechanism with the resolve= field.

i should use `python_sources(resolve=parametrize('ai-gpu', 'ai-cpu', 'python-default'). Given my shared code is spread across multiple directories, it will get unmaintainable to always set these resolves for all the targets. So i am thinking to set the defaults at root of python source code, like:

__defaults__(
    {(python_sources, python_source): dict(resolve=parametrize(python-default", "ai-gpu", "ai-cpu) )}
)

and for the 2 main files(pex_binary targets) that i am interested it, i will set the resolve

ai-cpu

,

ai-gpu

. Do you think this is a good idea? Should

__defaults__

be used/exploited like this, does it form a good practice, or is there a better way of doing this?

If you have that as default at the root, it will apply to everything, in which case I wonder why you have different resolves at all?

i was thinking, all my code will have 3 resolves, specify resolve in

pex_binary

as below

# ai/inference/BUILD
pex_binary(name="app-cpu", entry_point="main_inference.py", resolve="ai-cpu")
pex_binary(name="app-gpu", entry_point="main_inference.py", resolve="ai-gpu")

# webserver/BUILD
# non-ai-related code which doesn't care about cpu/gpu
pex_binary(name="app", entry_point="main.py")  -> this can take default resovle

if i don't provide all 3 resolves to all shared python_sources, i will not be able to provide different resolves to each pex_binaries

ah, ok. yea that makes sense I guess.

thanks