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Notes on what the build does

The build process is as follows:

  1. the fromscratch.sh script will check out opencv and contrib (unless optionally blocked) and build it targeting a statically compiled build with the java api.
  2. once built fromscratch.sh will call package.sh
  3. package.sh will find all of the build *.so and/or *.dll files and copy them to ./package-native/src/temp/libs
  4. package.sh will manipulate the files and delete files it deems unnecessary (see the script for details).
  5. package.sh will then set the version for the maven project. The maven project consists of: . |- package-native |- install-jar
  6. It will then run maven, optionally with the deploy target. The parent pom will call:
    1. install-jar which will install the jar file that was built by the opencv make process into a maven artifact at ai.kognition.pilecv4j:opencv --and optionally deploy it--
    2. package-native build a jar file that includes the content of the above artifact as well as the native libraries prepared earlier into an artifact at ai.kognition.pilecv4j:opencv with a classifier withlib and optionally deploy it.
  7. If you're deploying or building an opencv install, package.sh will bundle up the native install (the bin/lib/include dirs) into a zip file and use the maven project in opencv-zip-install to package it into an artifact at ai.kognition.pilecv4j:opencv-build and install that zip file into the local maven repo and optionally deploy it.

The following is enough to build from within a clean ubuntu:20.04 docker container.

export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true
apt update
apt install -y --no-install-recommends gnupg2 curl ca-certificates openjdk-11-jdk build-essential execstack git unzip zip pkg-config libjpeg-dev libpng-dev libtiff-dev python-dev python-numpy libgtk-3-dev libtbb2 libtbb-dev cmake tar ant maven python3-dev python3-numpy file
export ANT_HOME=/usr/share/ant
git clone ....
cd pilecv4j-opencv-packaging
./fromscratch.sh [-j12] --version 0.17 --opencv-version 4.5.2 --build-python --with-tbb --no-dnn [--zip /tmp/opencv4.5.2.zip] --install-prefix /opt/opencv [--deploy]