install

#!/bin/bash

# This script install singularity 

function print_usage () {
	echo "This script download singularity, compile and installs it"
	echo "root prividge is needed as some files need to be installed with suid.  eg:"
	echo "sudo ./install will install to /usr/local/singularity-\$BUILD"
	echo "sudo ./install --prefix=/opt --build=2.4.alpha will install to /opt/singularity-2.4.alpha"
}

### process command line arguments ###
# option parsing ref: 
# https://stackoverflow.com/questions/192249/how-do-i-parse-command-line-arguments-in-bash
for i in "$@"; do
	case $i in 
		-p=*|--prefix=*)
			PREFIX="${i#*=}"
			shift # past argument=value
			;;
		-b=*|--build=*)
			#BUILD="${i#*=}"
			BUILD="${i#*=}"
			shift # past argument=value
			;;
		-h|--help)
			print_usage
			exit 255
			;;
		*)
			echo "Unknown argument.  Use -h for help"
			exit 255
			;;
	esac
done



### actual install ###

PREFIX="${PREFIX:-/usr/local}"				# default install to /usr/local unless otherwise specified
#VER="{VER:-}"
if [[ x${BUILD} == "x" ]] ; then
	BUILD=$(date "+%Y.%m%d")
fi
INSTALLDIR=${PREFIX}/singularity-${BUILD} 

echo "This script install singularity to ${INSTALLDIR}"
echo "Press ^C in the next 15 seconds to cancel"
sleep 15
#echo "Press ^C to cancel or the ANY key to continue..."
#read CONFIRM
echo "installing..."



if [[ ! -d ${INSTALLDIR} ]]; then
 	mkdir -p ${INSTALLDIR} 
	EXITCODE=$?
	if [[ $EXITCODE -gt 0 ]]; then
		echo "Unable to create ${INSTALLDIR}.  Exiting."
		exit $EXITCODE
	fi
fi

GITSOURCE=${INSTALLDIR}/github
if [[ ! -d ${GITSOURCE} ]] ; then
	# singularity never pulled from github, setting it up now
	mkdir ${GITSOURCE}
	cd    ${GITSOURCE}
	git clone https://github.com/singularityware/singularity.git
else
	# update code before install
	cd    ${GITSOURCE}/singularity
	git pull
fi

cd    ${GITSOURCE}/singularity
./autogen.sh
EXITCODE=$?
if [[ $EXITCODE -gt 0 ]]; then
	echo "autogen didn't work correctly.  "
	echo "Please make sure the following packages are installed: libtool automake autoconf"
	exit $EXITCODE
fi
./configure --prefix=${INSTALLDIR}
make
sudo make install
EXITCODE=$?
if [[ $EXITCODE -eq 0 ]]; then
	echo "Done.  Singularity installed to ${INSTALLDIR}."
else
	echo "Something didn't go right, Singularity install exits with ${EXITCODE}."
fi