Trouble creating custom source (CFFI AttributeError)

[lizzielizzielizzie]

Hi. I'm using a python docker container that runs on alpine (python:3.8.1-alpine) and trying to create a custom source, bur it crashes every time:

>>> src = pyvips.SourceCustom()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.8/site-packages/pyvips/vsourcecustom.py", line 24, in __init__
    source = ffi.cast('VipsSource*', vips_lib.vips_source_custom_new())
AttributeError: cffi library '_libvips' has no function, constant or global variable named 'vips_source_custom_new'

Some debugging output:

$ pip show pyvips
Creating nucleo_django_run ... done
PostgreSQL is available
sh: show: unknown operand
Name: pyvips
Version: 2.1.12
Summary: binding for the libvips image processing library, API mode
Home-page: https://github.com/libvips/pyvips
Author: John Cupitt
Author-email: jcupitt@gmail.com
License: MIT
Location: /usr/local/lib/python3.8/site-packages
Requires: pkgconfig, cffi

>>> _libvips.lib.VIPS_MAJOR_VERSION
8
>>> _libvips.lib.VIPS_MINOR_VERSION
8
>>> _libvips.lib.VIPS_MICRO_VERSION
4

in our compose:

and finally, our pipfile haspyvips==2.1.12 required

With this setup i've been able to do some other operations usingpyvips, but creating the custom source hasn't been successful. Please let me know if there's something I'm overlooking or if there's more information that could be helpful. I can also try setting up a full repository to reproduce the issue if needed. All ideas are welcome and appreciated 🙂

[jcupitt]

Hi @NickWer,

Your libvips is too old -- the new source / target system was added in libvips 8.9. Current stable is 8.10.4.

[lizzielizzielizzie]

Hi! Sorry, I've been out of the office for a few days. I'll give that a try and see if that resolves things. If it does, I'll make an MR adding a note to the README. I really appreciate your help!

[lizzielizzielizzie]

It worked! I submitted a PR but the immediate problem is resolved. I'll leave you to decide if you'd like to close this now or once the PR is merged. Thanks a bunch 🙂