Ubuntu shellscript to install OpenCV

opencv-install.sh

#!/bin/bash

#########################################################################################################
## OpenCV Installation Script
##
## Code by	: Dimas Toha Pramawitra (Lonehack)
##		  <dms.pram@gmail.com>
## Created	: 20 Mar 2016
## Modified	: 16 Apr 2016
##
## This code is released to the public domain.
## You can use, modify, or distribute this code as you need without any restriction.
#########################################################################################################

#################################################################################
## Distribution check
#################################################################################

if [ -f /etc/debian_version ];then
	DIST="debian"
	PKG=$(which dpkg)
	PKGMGR=$(which apt-get)
	PKGLIST=" --get-selections"
elif [ -f /etc/redhat-release ];then
	DIST="redhat"
	PKG=$(which rpm)
	PKGMGR=$(which dnf)
	if [ -z "$PKGMGR" ];then
		PKGMGR=$(which yum)
	fi
	PKGLIST="--all"
else
	echo "Your Linux Distribution not yet supported by this script"
	echo "Install manualy or edit this script for your need"
	exit 0
fi
sudo $PKGMGR install -y pkg-config

#################################################################################
## Initialing and checking
#################################################################################

LIST=$($PKG $PKGLIST | grep opencv | awk '{print $1}')
OLDVER=$(pkg-config --modversion opencv)
OLDBASE=$(echo $OLDVER | cut -d'.' -f 1)
OCVURL="https://sourceforge.net/projects/opencvlibrary/files/opencv-unix"
VERSION="$(wget -q -O - $OCVURL | egrep -m1 -o '\"[0-9](\.[0-9]+)+' | cut -c2-)"
PREFIX="/usr/local/"

## Version Check
echo "OpenCV current version :" $VERSION
if [ "$OLDVER" = "$VERSION" ]; then
	echo "OpenCV already newest version :" $VERSION
	echo "If you want to downgrade, continue this script"
	read -rsp $'Continue installation? <y/N>\n' -n 1 key
	if [[ ! "$key" =~ ^[Yy]$ ]]; then
		exit 0
	fi		
fi

trap ctrl_c INT
function ctrl_c() {
        echo "Terminated by User!"
        exit 0
}

set -e

#################################################################################
## Function here
#################################################################################

debian_install () {
	if [ ! -z "$LIST" ];then
		echo "Removing pre-installed OpenCV" $OLDVER
		sudo apt-get remove $LIST
		echo "Removing OpenCV" $OLDVER "done!"
	else
		echo "OpenCV not found in pkg-config"
		echo "If old OpenCV was installed,"
		echo "please uninstall old OpenCV manually"
	fi

	echo "Removing any pre-installed ffmpeg and x264"
	sudo apt-get remove libav-tools \
							x264 \
							libx264-dev

	echo "Installing Dependenices"
	sudo apt-get install -y libopencv-dev \
							build-essential \
							checkinstall \
							cmake \
							yasm \
							libjpeg-dev \
							libjasper-dev \
							libavcodec-dev \
							libavformat-dev \
							libswscale-dev \
							libdc1394-22-dev \
							libxine-dev \
							libgstreamer0.10-dev \
							libgstreamer-plugins-base0.10-dev \
							libv4l-dev \
							python-dev \
							python-numpy \
							libtbb-dev \
							libqt4-dev libgtk2.0-dev \
							libfaac-dev \
							libmp3lame-dev \
							libtheora-dev \
							libvorbis-dev \
							libxvidcore-dev \
							x264 \
							v4l-utils \
							libav-tools
}
redhat_install () {
	if [ ! -z "$LIST" ];then
		echo "Removing pre-installed OpenCV" $OLDVER
		sudo $PKGMGR erase $LIST
		echo "Removing OpenCV" $OLDVER "done!"
	else
		echo "OpenCV not found in pkg-config"
		echo "If old OpenCV was installed,"
		echo "please uninstall old OpenCV manually"
	fi

	echo "Removing any pre-installed ffmpeg and x264"
	sudo $PKGMGR erase libav-tools \
							x264 \
							libx264-devel

	echo "Installing Dependenices"
	sudo $PKGMGR group install -y "Development Tools"
	sudo $PKGMGR group install -y "C Development Tools and Libraries"
	sudo $PKGMGR install -y opencv-devel \
							checkinstall \
							cmake \
							yasm \
							libjpeg-devel \
							libjasper-devel \
							libavcodec-devel \
							libavformat-devel \
							libswscale-devel \
							libdc1394-22-devel \
							libxine-devel \
							libgstreamer0.10-devel \
							libgstreamer-plugins-base0.10-devel \
							libv4l-devel \
							python-devel \
							python-numpy \
							libtbb-devel \
							libqt4-devel \
							libgtk2.0-devel \
							libfaac-devel \
							lame-devel \
							libtheora-devel \
							libvorbis-devel \
							libxvidcore-devel \
							x264 \
							v4l-utils \
							libav-tools
}

#################################################################################
## Initialing and checking
#################################################################################

## Remove pre-installed OpenCV
## install Dependenices OpenCV
if [ "$DIST" = "debian" ];then
	debian_install
elif [ "$DIST" = "redhat" ];then
	redhat_install
fi

## Download OpenCV						
if [ ! -e opencv-$VERSION.zip ];then
	echo "Latest version :" $VERSION
	read -rsp $'Download latest version? <Y/n>\n' -n 1 key
	if [[ "$key" =~ ^[Nn]$ ]]; then
		# n pressed
		read -rp $'Enter OpenCV version[2.4, 2.4.x or 3] :\n' down
		if [[ ! "$down" =~ ^[0-9]+(\.[0-9]+)+* ]];then
			echo "invalid version search"
			exit 0
		fi
		VERSION="$(wget -q -O - "$OCVURL" | egrep -m1 -o '\"'$down'(\.[0-9]+)+*' | cut -c2-)"
		if [ ! -z $VERSION ];then
			if [ ! -e opencv-$VERSION.zip ];then
				echo "Download OpenCV " $VERSION
				wget -O opencv-$VERSION.zip $OCVURL/$VERSION/opencv-$VERSION.zip/download
			fi
		else
			echo "OpenCV version not found!"
			exit 0
		fi
	else
		echo "Downloading OpenCV" $VERSION
		wget -O opencv-$VERSION.zip $OCVURL/$VERSION/opencv-$VERSION.zip/download
	fi
fi

echo "Building OpenCV"    
unzip opencv-$VERSION.zip
cd opencv-$VERSION
if [ ! -e build ];then
	mkdir build
fi
cd build
/usr/bin/cmake -D CMAKE_BUILD_TYPE=RELEASE \
		-D CMAKE_INSTALL_PREFIX=/usr/local \
		-D BUILD_NEW_PYTHON_SUPPORT=ON \
		-D WITH_V4L=ON \
		-D INSTALL_C_EXAMPLES=ON \
		-D INSTALL_PYTHON_EXAMPLES=ON \
		-D INSTALL_TESTS=ON \
		-D BUILD_EXAMPLES=ON \
		-D WITH_TBB=ON \
		-D WITH_QT=ON \
		-D WITH_OPENGL=ON \
		..
make -j4

## Delete old OpenCV library
if [ ! -z "$OLDVER" ];then
	echo "Old version OpenCV detected : "$OLDVER
	read -rsp $'Delete old library? <y/N>\n' -n 1 key
	if [[ $key =~ ^[Yy]$ ]]; then
		# y pressed
		echo "Uninstall old OpenCV library :" $OLDVER
		sudo find "$PREFIX"/lib -maxdepth 1 -name "libopencv*.$OLDBASE*" -exec rm -f {} \;
	else
		echo "Old library not deleted"
	fi
fi

echo "Installing OpenCV"
sudo checkinstall
sudo sh -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'
sudo ldconfig
echo "OpenCV "$VERSION" installation finished!!"