Usage of tool uv in Dockerfile fails to activate environment

[brunolnetto]

Hi all. I want to use uv on my Dockerfile. After more than 3 hours reading and implementing the documentation, without success to "activate the environment", I came here for help. THe repository is here. The command to run the application is docker compose up -d --build.

After "succesfully building the application", following error pops up:

   Building landgraph-pydantic-mvp @ file:///app
      Built landgraph-pydantic-mvp @ file:///app
Uninstalled 1 package in 2ms
Installed 1 package in 0.64ms
Bytecode compiled 6046 files in 1.03s
error: Failed to spawn: uvicorn
  Caused by: No such file or directory (os error 2)

I am sure, I am using it wrongly, but at this point, I am tired of trying new things out. Therefore, any help is appreciated.

[charliermarsh]

I cloned the repo and it mostly "just worked" for me? I had to run uv add langchain-openai. Then I ran docker compose up -d --build and looked at the logs:

INFO:     Will watch for changes in these directories: ['/app']
INFO:     Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [131] using WatchFiles

(It's immediately failing because I don't have OPENAI_API_KEY set, but uvicorn starts without issue.)

[brunolnetto]

You don't count. Tool uv is your favourite child, it will always obey you. 😅 . But it still is not working properly for me, with the same issue. :/

[zanieb]

You mount your working directory as a volume

    volumes:
      - .:/app

This can clobber the existing environment as mentioned at https://docs.astral.sh/uv/guides/integration/docker/#developing-in-a-container

See https://github.com/astral-sh/uv-docker-example/blob/ac09d87bf12d7b2d573a0e37c1d64f791ae31f10/compose.yml#L14-L21 instead

[brunolnetto]

Thanks, @zanieb. You guys are so amazing, I feel blessed everytime I come here asking for help.