opencv-python-headless requires x11

[gldraphael]

Expected behaviour

import cv2 should not throw if libsm6, libxrender-dev, and libxext6 are not installed when using opencv-python-headless.

Actual behaviour

import cv2 throws.

Steps to reproduce

1. Create the following Dockerfile:

   FROM python:3.7-slim-stretch
   
   # Print architecture
   dpkg --print-architecture
   
   # Install OpenCV's runtime dependencies
   RUN apt-get update
   RUN apt-get -y install libglib2.0-0
   # Uncomment the unfollowing lines, to get it to work
   # RUN apt-get -y install libsm6 \
   #     libxrender-dev \
   #     libxext6
   
   # Install OpenCV headless using pip
   RUN pip install opencv-python-headless==4.1.0.25
   
   # Ensure that opencv and its dependencies
   # are correctly installed
   RUN python -c 'import cv2'

2. Build the image, and import cv2 will throw:

   docker build --rm -t opencv-headless-exp:latest .

3. Uncomment installation of libsm6, libxrender-dev, and libxext6 and import cv2 won't throw anymore.

• OS: Debian stretch slim
• Architecture: amd64
• opencv-python-headless version: 4.1.0.25

[skvark]

Thanks for the report. I don't know why x11 is required, those builds are not linked with Qt. I'll have to investigate if I have missed some additional cmake flag which enables GUI functionality.

[native-api]

1. Create the following `Dockerfile`:

WFM in Ubuntu Bionic if I docker run -it python:3.7-slim-stretch bash and run the following specified commands by hand.

ldd also confirms that all the dependencies of cv2.*.so provided by the package are satisfied.

[xkortex]

I noticed this happens if opencv-python gets accidentally pip installed.

I had no problem running this dockerfile:

FROM python:3.7-slim-stretch

# Print architecture
RUN dpkg --print-architecture

# Install OpenCV's runtime dependencies
RUN apt-get update
RUN apt-get -y install libglib2.0-0

# Install OpenCV headless using pip
RUN pip install opencv-python-headless==4.1.0.25

RUN python -c 'import cv2'

FROM python:3.6-slim-stretch works too.

[skvark]

Seems to work fine (no GUI deps needed):

docker run -it python:3.7-slim-stretch bash
root@41fb0dd9296b:/# apt-get update
Ign:1 http://deb.debian.org/debian stretch InRelease
Get:2 http://deb.debian.org/debian stretch-updates InRelease [91.0 kB]
Get:3 http://security.debian.org/debian-security stretch/updates InRelease [94.3 kB]
Get:4 http://deb.debian.org/debian stretch Release [118 kB]
Get:5 http://deb.debian.org/debian stretch Release.gpg [2365 B]
Get:6 http://deb.debian.org/debian stretch-updates/main amd64 Packages [27.4 kB]
Get:7 http://security.debian.org/debian-security stretch/updates/main amd64 Packages [503 kB]
Get:8 http://deb.debian.org/debian stretch/main amd64 Packages [7086 kB]
Fetched 7922 kB in 1s (4905 kB/s)
Reading package lists... Done
root@41fb0dd9296b:/# apt-get -y install libglib2.0-0
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  libglib2.0-data libicu57 libxml2 sgml-base shared-mime-info xdg-user-dirs xml-core
Suggested packages:
  sgml-base-doc debhelper
The following NEW packages will be installed:
  libglib2.0-0 libglib2.0-data libicu57 libxml2 sgml-base shared-mime-info xdg-user-dirs xml-core
0 upgraded, 8 newly installed, 0 to remove and 0 not upgraded.
Need to get 14.7 MB of archives.
After this operation, 53.1 MB of additional disk space will be used.
Get:1 http://deb.debian.org/debian stretch/main amd64 sgml-base all 1.29 [14.8 kB]
Get:2 http://deb.debian.org/debian stretch/main amd64 libicu57 amd64 57.1-6+deb9u3 [7705 kB]
Get:3 http://deb.debian.org/debian stretch/main amd64 libxml2 amd64 2.9.4+dfsg1-2.2+deb9u2 [920 kB]
Get:4 http://deb.debian.org/debian stretch/main amd64 libglib2.0-0 amd64 2.50.3-2+deb9u1 [2691 kB]
Get:5 http://deb.debian.org/debian stretch/main amd64 libglib2.0-data all 2.50.3-2+deb9u1 [2518 kB]
Get:6 http://deb.debian.org/debian stretch/main amd64 shared-mime-info amd64 1.8-1+deb9u1 [731 kB]
Get:7 http://deb.debian.org/debian stretch/main amd64 xdg-user-dirs amd64 0.15-2+b1 [52.2 kB]
Get:8 http://deb.debian.org/debian stretch/main amd64 xml-core all 0.17 [23.2 kB]
Fetched 14.7 MB in 0s (44.2 MB/s)
debconf: delaying package configuration, since apt-utils is not installed
Selecting previously unselected package sgml-base.
(Reading database ... 6710 files and directories currently installed.)
Preparing to unpack .../0-sgml-base_1.29_all.deb ...
Unpacking sgml-base (1.29) ...
Selecting previously unselected package libicu57:amd64.
Preparing to unpack .../1-libicu57_57.1-6+deb9u3_amd64.deb ...
Unpacking libicu57:amd64 (57.1-6+deb9u3) ...
Selecting previously unselected package libxml2:amd64.
Preparing to unpack .../2-libxml2_2.9.4+dfsg1-2.2+deb9u2_amd64.deb ...
Unpacking libxml2:amd64 (2.9.4+dfsg1-2.2+deb9u2) ...
Selecting previously unselected package libglib2.0-0:amd64.
Preparing to unpack .../3-libglib2.0-0_2.50.3-2+deb9u1_amd64.deb ...
Unpacking libglib2.0-0:amd64 (2.50.3-2+deb9u1) ...
Selecting previously unselected package libglib2.0-data.
Preparing to unpack .../4-libglib2.0-data_2.50.3-2+deb9u1_all.deb ...
Unpacking libglib2.0-data (2.50.3-2+deb9u1) ...
Selecting previously unselected package shared-mime-info.
Preparing to unpack .../5-shared-mime-info_1.8-1+deb9u1_amd64.deb ...
Unpacking shared-mime-info (1.8-1+deb9u1) ...
Selecting previously unselected package xdg-user-dirs.
Preparing to unpack .../6-xdg-user-dirs_0.15-2+b1_amd64.deb ...
Unpacking xdg-user-dirs (0.15-2+b1) ...
Selecting previously unselected package xml-core.
Preparing to unpack .../7-xml-core_0.17_all.deb ...
Unpacking xml-core (0.17) ...
Setting up libglib2.0-0:amd64 (2.50.3-2+deb9u1) ...
No schema files found: doing nothing.
Setting up sgml-base (1.29) ...
Setting up libicu57:amd64 (57.1-6+deb9u3) ...
Setting up libxml2:amd64 (2.9.4+dfsg1-2.2+deb9u2) ...
Setting up libglib2.0-data (2.50.3-2+deb9u1) ...
Processing triggers for libc-bin (2.24-11+deb9u4) ...
Setting up shared-mime-info (1.8-1+deb9u1) ...
Setting up xml-core (0.17) ...
Setting up xdg-user-dirs (0.15-2+b1) ...
Processing triggers for sgml-base (1.29) ...
root@41fb0dd9296b:/# pip install opencv-python-headless==4.1.0.25
Collecting opencv-python-headless==4.1.0.25
  Downloading https://files.pythonhosted.org/packages/29/b0/8fe2f63e85d102c92b8d5d36a784aaf38304693595774b5f8ac0deb462a2/opencv_python_headless-4.1.0.25-cp37-cp37m-manylinux1_x86_64.whl (20.0MB)
     |████████████████████████████████| 20.0MB 9.8MB/s
Collecting numpy>=1.14.5 (from opencv-python-headless==4.1.0.25)
  Downloading https://files.pythonhosted.org/packages/ba/e0/46e2f0540370f2661b044647fa447fef2ecbcc8f7cdb4329ca2feb03fb23/numpy-1.17.2-cp37-cp37m-manylinux1_x86_64.whl (20.3MB)
     |████████████████████████████████| 20.3MB 12.6MB/s
Installing collected packages: numpy, opencv-python-headless
Successfully installed numpy-1.17.2 opencv-python-headless-4.1.0.25
root@41fb0dd9296b:/# python -c 'import cv2'
root@41fb0dd9296b:/# python
Python 3.7.4 (default, Sep 12 2019, 16:13:12)
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> cv2.__file__
'/usr/local/lib/python3.7/site-packages/cv2/cv2.cpython-37m-x86_64-linux-gnu.so'
>>> exit()
root@41fb0dd9296b:/# ldd /usr/local/lib/python3.7/site-packages/cv2/cv2.cpython-37m-x86_64-linux-gnu.so
        linux-vdso.so.1 (0x00007fffe6b1b000)
        libz-a147dcb0.so.1.2.3 => /usr/local/lib/python3.7/site-packages/cv2/.libs/libz-a147dcb0.so.1.2.3 (0x00007f8645dbf000)
        libavcodec-874f3d51.so.58.47.106 => /usr/local/lib/python3.7/site-packages/cv2/.libs/libavcodec-874f3d51.so.58.47.106 (0x00007f8644753000)
        libavformat-fb41c63f.so.58.26.101 => /usr/local/lib/python3.7/site-packages/cv2/.libs/libavformat-fb41c63f.so.58.26.101 (0x00007f86442f6000)
        libavutil-473e9eb1.so.56.26.100 => /usr/local/lib/python3.7/site-packages/cv2/.libs/libavutil-473e9eb1.so.56.26.100 (0x00007f864407b000)
        libswscale-4e6f4703.so.5.4.100 => /usr/local/lib/python3.7/site-packages/cv2/.libs/libswscale-4e6f4703.so.5.4.100 (0x00007f8643df0000)
        libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f8643bee000)
        libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f86438da000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f86436d6000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f86434b9000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f86432b1000)
        libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f8642f2f000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f8642c2b000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f8642a14000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f8642675000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f8647d49000)
        libswresample-a49c020a.so.3.4.100 => /usr/local/lib/python3.7/site-packages/cv2/.libs/libswresample-a49c020a.so.3.4.100 (0x00007f8642457000)
        libvpx-8459aeef.so.6.0.0 => /usr/local/lib/python3.7/site-packages/cv2/.libs/libvpx-8459aeef.so.6.0.0 (0x00007f8641f53000)
        libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f8641ce0000)

[deppmish2]

Still get the error when i add virtual environment ->

File "/venv/lib/python3.7/site-packages/cv2/init.py", line 3, in
from .cv2 import *
ImportError: libgthread-2.0.so.0: cannot open shared object file: No such file or directory

[native-api]

Still get the error when i add virtual environment ->

File "/venv/lib/python3.7/site-packages/cv2/init.py", line 3, in
from .cv2 import *
ImportError: libgthread-2.0.so.0: cannot open shared object file: No such file or directory

Install libgthread-2.0.so.0. It's a prerequisite for running manylinux1 wheels as per https://www.python.org/dev/peps/pep-0513/.