pyvips in Docker environment

Hi there, This issue is related with #76 .

I’ll borrow my previous comments in #76 in below.

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Hello @jcupitt , I’m using docker environment and python 3.7. I think I’m suffering similar issues. Can I get a any hint for this issue?

~$ docker exec -it 2b14 /bin/bash
root@2b147d09f5d5:/conduit# pip3.7 install --upgrade pip
Requirement already up-to-date: pip in /usr/local/lib/python3.7/site-packages (19.0.1)
root@2b147d09f5d5:/conduit# pip3.7 install pyvips
Requirement already satisfied: pyvips in /usr/local/lib/python3.7/site-packages (2.1.5)
Requirement already satisfied: cffi>=1.0.0 in /usr/local/lib/python3.7/site-packages (from pyvips) (1.11.5)
Requirement already satisfied: pycparser in /usr/local/lib/python3.7/site-packages (from cffi>=1.0.0->pyvips) (2.19)
root@2b147d09f5d5:/conduit#  python3.7
Python 3.7.2 (default, Jan 23 2019, 02:31:57) 
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyvips
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/pyvips/__init__.py", line 19, in <module>
    import _libvips
ModuleNotFoundError: No module named '_libvips'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.7/site-packages/pyvips/__init__.py", line 69, in <module>
    vips_lib = ffi.dlopen(_vips_libname)
  File "/usr/local/lib/python3.7/site-packages/cffi/api.py", line 141, in dlopen
    lib, function_cache = _make_ffi_library(self, name, flags)
  File "/usr/local/lib/python3.7/site-packages/cffi/api.py", line 802, in _make_ffi_library
    backendlib = _load_backend_lib(backend, libname, flags)
  File "/usr/local/lib/python3.7/site-packages/cffi/api.py", line 797, in _load_backend_lib
    raise OSError(msg)
OSError: cannot load library 'libvips.so.42': libvips.so.42: cannot open shared object file: No such file or directory.  Additionally, ctypes.util.find_library() did not manage to locate a library called 'libvips.so.42'

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https://github.com/libvips/pyvips/issues/76#issuecomment-459685994 @jcupitt commented Have you installed the libvips library? It looks like it can’t be found by pyvips. If you can’t fix it, please open a new issue and share your Dockerfile.

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I think I don’t have libvips in docker environment as you told. Though I want to download a libvips in docker env, I can not find easy and precise way. I downloaded libvips in my local linux(ubuntu) env with just command apt install libvips-tools.

So, Can you please let me know the precise way to download libvips library in docker environment?

By the way, Its my Dockerfile

 FROM python:3
 ENV PYTHONUNBUFFERED 1
 RUN mkdir /backend
 WORKDIR /backend
 ADD requirements.txt /backend/
 RUN pip install -r requirements.txt
 ADD . /backend/
 EXPOSE 8000

and requirements.txt

Django==1.9.6
django-extensions==1.6.7
djangorestframework==3.3.3
PyJWT==1.4.0
six==1.10.0
django-cors-headers
psycopg2

Also using docker-compose

  backend:
    build: .
    volumes:
      - ./:/conduit 
    working_dir: /conduit/
    command: sh entrypoint.sh
    ports:
      - 8000:8000
    depends_on:
      - db

and entrypoint.sh

pip install -r requirements.txt
python manage.py migrate
python manage.py runserver 0.0.0.0:8000

Sorry for my broken english.

Sincerely, Eunsung Sam Koh

[EunsungKoh]

Finally It works!

root@837287600fd5:/conduit# python3
Python 3.7.2 (default, Feb  6 2019, 12:04:03) 
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import logging
>>> logging.basicConfig(level = logging.DEBUG)
>>> import pyvips
DEBUG:pyvips:Loaded binary module _libvips
DEBUG:pyvips:Inited libvips
>>> 

THANKS @jcupitt 👍

[jcupitt]

Yes, works for me too. I made you a complete Dockerfile:

https://github.com/jcupitt/docker-builds/tree/master/pyvips-python3

I see:

$ docker build -t pyvips-python3 .
Sending build context to Docker daemon  15.87kB
...
Successfully built pyvips pycparser
Installing collected packages: pycparser, cffi, pyvips
Successfully installed cffi-1.11.5 pycparser-2.19 pyvips-2.1.5
Removing intermediate container 10237d85e203
 ---> 39e76254370f
Successfully built 39e76254370f
Successfully tagged pyvips-python3:latest

Then:

$ docker run --rm -it pyvips-python3
Python 3.7.2 (default, Feb  6 2019, 12:04:03) 
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyvips
>>>