Compatibility with monorepos (multi-procfile buildpack)?

[ddahan]

What is the right way to use this buildback, while using Heroku Multi Procfile buildpack in the same time?

I tried this way:

My Python app (and Procfile) is in back/ folder of my root repo. Obviously, I soon as I tried to deploy, I get this error:

Any idea? workaround? Thanks.

[zyv]

My Python app (and Procfile) is in back/ folder of my root repo. Obviously, I soon as I tried to deploy, I get this error:

I don't think that this is related to Heroku Multi Procfile buildpack. This is how we detect a compatible app:

python-poetry-buildpack/bin/detect

Line 7 in fe3ac68

if [ ! -f "$BUILD_DIR/poetry.lock" ] ; then

(we look for poetry.lock in the root folder of the app)

Even if we would add some way to specify a custom path for poetry.lock, then I'm pretty sure that then next buildpack (Python) will fail, because it expects requirements.txt in the root directory:

https://github.com/heroku/heroku-buildpack-python/blob/59e24ef8bbda64832b5dcc0145404ac73fa8f3cf/bin/detect#L18

We could of course generate requirements.txt in the root directory, but this sounds very questionable.

I believe that this is out of the scope of this buildpack. There are several external solutions for apps in subdirectories that generally work for all buildpacks:

1. Symlink project files like pyproject.toml and poetry.lock
2. Use standalone or inline buildpack to move the source code
   • https://github.com/timanovsky/subdir-heroku-buildpack
   • https://jtway.co/deploying-subdirectory-projects-to-heroku-f31ed65f3f2
3. Using subtree push

I think that's enough poison to pick from...

[ddahan]

Thanks for the detailed answer. I didn't know about subdir heroku buildpack!