Deploy issue with Python PIL/Pillow and libwebp.so.7 not found

I'm running into what seems like a fairly simple deploy issue:

from faerymarket.utils import image
File "/opt/venv/lib/python3.11/site-packages/faerymarket/utils/image.py", line 9, in <module>
from PIL import Image as PILImage
File "/opt/venv/lib/python3.11/site-packages/PIL/Image.py", line 114, in <module>
from . import _imaging as core
ImportError: libwebp.so.7: cannot open shared object file: No such file or directory

from faerymarket.utils import image
File "/opt/venv/lib/python3.11/site-packages/faerymarket/utils/image.py", line 9, in <module>
from PIL import Image as PILImage
File "/opt/venv/lib/python3.11/site-packages/PIL/Image.py", line 114, in <module>
from . import _imaging as core
ImportError: libwebp.so.7: cannot open shared object file: No such file or directory

In my earlier attempts, I simply couldn't get the package to build, so I updated the railway.json file to include the build dependencies. Here is my railway.json file:

{
  "$schema": "https://railway.app/railway.schema.json",
  "build": {
    "builder": "NIXPACKS",
    "nixpacksPlan": {
      "phases": {
        "setup": {
          "aptPkgs": ["...", "libtiff5-dev" , "libjpeg-dev", "libopenjp2-7-dev", "zlib1g-dev", "libfreetype6-dev", "liblcms2-dev", "libwebp-dev", "libharfbuzz-dev", "libfribidi-dev", "libxcb1-dev"]
        }
      }
    }
  },
  "deploy": {
    "numReplicas": 1,
    "startCommand": "python src/faerymarket/manage.py migrate && python src/faerymarket/manage.py collectstatic --noinput --clear && bin/uwsgi --ini=src/faerymarket/api.ini",
    "healthcheckPath": "health/",
    "sleepApplication": false,
    "restartPolicyType": "ON_FAILURE",
    "restartPolicyMaxRetries": 10
  }
}

{
  "$schema": "https://railway.app/railway.schema.json",
  "build": {
    "builder": "NIXPACKS",
    "nixpacksPlan": {
      "phases": {
        "setup": {
          "aptPkgs": ["...", "libtiff5-dev" , "libjpeg-dev", "libopenjp2-7-dev", "zlib1g-dev", "libfreetype6-dev", "liblcms2-dev", "libwebp-dev", "libharfbuzz-dev", "libfribidi-dev", "libxcb1-dev"]
        }
      }
    }
  },
  "deploy": {
    "numReplicas": 1,
    "startCommand": "python src/faerymarket/manage.py migrate && python src/faerymarket/manage.py collectstatic --noinput --clear && bin/uwsgi --ini=src/faerymarket/api.ini",
    "healthcheckPath": "health/",
    "sleepApplication": false,
    "restartPolicyType": "ON_FAILURE",
    "restartPolicyMaxRetries": 10
  }
}

The custom build command is:

python -m pip install .

python -m pip install .

This all works fine with the exception of the inability to import the image library. My best guess, because I'm only partway though a lot of the docs, is that perhaps the setup phase packages aren't included in the final image layer? Does anyone have any ideas I could try?

9 Replies

Percy•5mo ago

Project ID: N/A

Induane•5mo ago

Project ID: 26158cd2-ea48-4b82-815a-a7bfdc2a83bd

Brody•5mo ago

you have gotten extremely far, and I think you are correct with your assumption on why it doesn't work, those packages are getting installed but aren't included in the final image, or maybe the library paths aren't being updated, something along those lines. solution being, use a Dockerfile based build and install all those same packages

Induane•5mo ago

Yea - I can switch it to docker if I have to I suppose. It's an OCI container at the end either way

Brody•5mo ago

Dockerfile also gives you far more control

Induane•5mo ago

The nixpack stuff seemed fun though, and also to be the default. Usually I try to go with as much default as possible as it's often the happy path. But I can setup a decent multistage dockerfile and call it a day

Brody•5mo ago

Railway will always support Dockerfiles, after all, nixpacks is literally putting together a dockerfile

Induane•5mo ago

That's cool - I didn't know it just built a dockerfile under the hood. I assumed it was some bespoke custom OCI complaint container generator 😄

Brody•5mo ago

yep! so if you're comfortable with Dockerfiles, writing one yourself is going to give you far more control

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Deploy issue with Python PIL/Pillow and libwebp.so.7 not found