Travis CI: "Unable to locate package python-opencv" Python 2.7
After:
sudo add-apt-repository python-opencv
You need
sudo apt-get update
So that the new repository information is correctly updated; before you can add packages from that repository.
![Michael Currie](https://i.stack.imgur.com/JM61c.jpg?s=256&g=1)
Michael Currie
BMath, University of Waterloo, 2007. Experience with SQL, Python, JavaScript, C++, VBA.
Updated on June 05, 2022Comments
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Michael Currie about 2 years
On a normal non-virtualenv Ubuntu machine I can run:
sudo apt-get install python-opencv
And then from Python 2.7 I can run
import cv2
. Success!But when I try to do the very same thing in my
.travis.yml
file for automated testing, I get the error:E: Unable to locate package python-opencv
How can I get apt-get to locate
python-opencv
in my Travis-CI build?I've tried the following; all were unsuccessful:
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From https://askubuntu.com/questions/339217/, I tried appending these lines to
/etc/apt/sources.list
:echo "deb http://de.archive.ubuntu.com/ubuntu precise main restricted universe" | sudo tee -a /etc/apt/sources.list echo "deb-src http://de.archive.ubuntu.com/ubuntu precise restricted main multiverse universe" | sudo tee -a /etc/apt/sources.list echo "deb http://de.archive.ubuntu.com/ubuntu precise-updates main restricted universe" | sudo tee -a /etc/apt/sources.list echo "deb-src http://de.archive.ubuntu.com/ubuntu precise-updates restricted main multiverse universe" | sudo tee -a /etc/apt/sources.list
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From here I tried adding these lines right before:
sudo apt-get install python-software-properties sudo add-apt-repository python-opencv
Following this, with updated method from here, I tried using this instead of
2.7
:
python: - "2.7_with_system_site_packages"
(My full
.travis.yml
file is here.)Update
Burhan Khalid's answer did get OpenCV installed, so the error went away. However, then when I tried find the package using
import cv2
it still couldn't find it, because the Travis-CI build machine is wrapped in a virtualenv. So we can't access packages outside of our hermetically-sealed build environment.So I build from source. (References: here, here and here)
Here's how to do it in the
.travis.yml
file:env: global: # Dependencies - DEPS_DIR="`readlink -f $TRAVIS_BUILD_DIR/..`" - OPENCV_BUILD_DIR=$DEPS_DIR/opencv/build
And then, in the
before_install
section:- travis_retry git clone --depth 1 https://github.com/Itseez/opencv.git $DEPS_DIR/opencv - mkdir $OPENCV_BUILD_DIR && cd $OPENCV_BUILD_DIR - | if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then cmake -DBUILD_TIFF=ON -DBUILD_opencv_java=OFF -DWITH_CUDA=OFF -DENABLE_AVX=ON -DWITH_OPENGL=ON -DWITH_OPENCL=ON -DWITH_IPP=ON -DWITH_TBB=ON -DWITH_EIGEN=ON -DWITH_V4L=ON -DBUILD_TESTS=OFF -DBUILD_PERF_TESTS=OFF -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=$(python -c "import sys; print(sys.prefix)") -DPYTHON_EXECUTABLE=$(which python) -DPYTHON_INCLUDE_DIR=$(python -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())") -DPYTHON_PACKAGES_PATH=$(python -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())") .. else cmake -DBUILD_TIFF=ON -DBUILD_opencv_java=OFF -DWITH_CUDA=OFF -DENABLE_AVX=ON -DWITH_OPENGL=ON -DWITH_OPENCL=ON -DWITH_IPP=ON -DWITH_TBB=ON -DWITH_EIGEN=ON -DWITH_V4L=ON -DBUILD_TESTS=OFF -DBUILD_PERF_TESTS=OFF -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=$(python3 -c "import sys; print(sys.prefix)") -DPYTHON_EXECUTABLE=$(which python3) -DPYTHON_INCLUDE_DIR=$(python3 -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())") -DPYTHON_PACKAGES_PATH=$(python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())") .. fi - make -j4 - sudo make install - echo "/usr/local/lib" | sudo tee -a /etc/ld.so.conf.d/opencv.conf - sudo ldconfig - echo "PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig" | sudo tee -a /etc/bash.bashrc - echo "export PKG_CONFIG_PATH" | sudo tee -a /etc/bash.bashrc - export PYTHONPATH=$OPENCV_BUILD_DIR/lib/python3.3/site-packages:$PYTHONPATH
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Michael Currie over 8 yearsThis installs openCV on the machine, but it's no good because it's isolated from my Travis-CI virtualenv. See the update in my question.