#!/bin/bash

# This script builds the installer for *nix systems. Windows must do everything
# completely differently, as usual.

export PATH=/bin:/usr/bin:/sbin:/usr/sbin

if [ ! -f zerotier-one ]; then
	echo "Could not find 'zerotier-one' binary, please build before running this script."
	exit 2
fi

machine=`uname -m`
system=`uname -s`

vmajor=`cat version.h | grep -F ZEROTIER_ONE_VERSION_MAJOR | cut -d ' ' -f 3`
vminor=`cat version.h | grep -F ZEROTIER_ONE_VERSION_MINOR | cut -d ' ' -f 3`
revision=`cat version.h | grep -F ZEROTIER_ONE_VERSION_REVISION | cut -d ' ' -f 3`

if [ -z "$vmajor" -o -z "$vminor" -o -z "$revision" ]; then
	echo "Unable to extract version info from version.h, aborting installer build."
	exit 2
fi

rm -rf build-installer
mkdir build-installer

case "$system" in

	Linux)
		# Canonicalize $machine for some architectures... we use x86
		# and x64 for Intel stuff. ARM and others should be fine if
		# we ever ship officially for those.
		debian_arch=$machine
		case "$machine" in
			i386|i486|i586|i686)
				machine="x86"
				debian_arch="i386"
				;;
			x86_64|amd64|x64)
				machine="x64"
				debian_arch="amd64"
				;;
			armv6l|arm|armhf)
				machine="armv6l"
				debian_arch="armhf"
				;;
		esac

		echo "Assembling Linux installer for $machine and version $vmajor.$vminor.$revision"

		mkdir -p 'build-installer/var/lib/zerotier-one'
		cp -fp 'ext/installfiles/linux/uninstall.sh' 'build-installer/var/lib/zerotier-one'
		cp -fp 'zerotier-one' 'build-installer/var/lib/zerotier-one'
		mkdir -p 'build-installer/tmp'
		cp -fp 'ext/installfiles/linux/init.d/zerotier-one' 'build-installer/tmp/init.d_zerotier-one'
		cp -fp 'ext/installfiles/linux/systemd/zerotier-one.service' 'build-installer/tmp/systemd_zerotier-one.service'

		targ="ZeroTierOneInstaller-linux-${machine}-${vmajor}_${vminor}_${revision}"
		# Use gzip in Linux since some minimal Linux systems do not have bunzip2
		rm -f build-installer-tmp.tar.gz
		cd build-installer
		tar -cf - * | gzip -9 >../build-installer-tmp.tar.gz
		cd ..
		rm -f $targ
		cat ext/installfiles/linux/install.tmpl.sh build-installer-tmp.tar.gz >$targ
		chmod 0755 $targ
		rm -f build-installer-tmp.tar.gz
		ls -l $targ

		if [ -f /usr/bin/dpkg-deb -a "$UID" -eq 0 ]; then
			echo
			echo Found dpkg-deb and you are root, trying to build Debian package.

			rm -rf build-installer-deb

			debbase="build-installer-deb/zerotier-one_${vmajor}.${vminor}.${revision}_$debian_arch"
			debfolder="${debbase}/DEBIAN"
			mkdir -p $debfolder

			cat 'ext/installfiles/linux/DEBIAN/control.in' | sed "s/__VERSION__/${vmajor}.${vminor}.${revision}/" | sed "s/__ARCH__/${debian_arch}/" >$debfolder/control
			cat $debfolder/control
			cp -f 'ext/installfiles/linux/DEBIAN/conffiles' "${debfolder}/conffiles"

			mkdir -p "${debbase}/var/lib/zerotier-one/updates.d"
			cp -f $targ "${debbase}/var/lib/zerotier-one/updates.d"

			rm -f "${debfolder}/postinst" "${debfolder}/prerm"

			echo '#!/bin/bash' >${debfolder}/postinst
			echo "/var/lib/zerotier-one/updates.d/${targ}" >>${debfolder}/postinst
			echo "/bin/rm -f /var/lib/zerotier-one/updates.d/*" >>${debfolder}/postinst
			chmod a+x ${debfolder}/postinst

			echo '#!/bin/bash' >${debfolder}/prerm
			echo 'export PATH=/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin' >>${debfolder}/prerm
			echo 'if [ "$1" != "upgrade" ]; then' >>${debfolder}/prerm
			echo '	/var/lib/zerotier-one/uninstall.sh' >>${debfolder}/prerm
			echo 'fi' >>${debfolder}/prerm
			chmod a+x ${debfolder}/prerm

			dpkg-deb --build $debbase

			mv -f build-installer-deb/*.deb .
			rm -rf build-installer-deb
		fi

		if [ -f /usr/bin/rpmbuild ]; then
			echo
			echo Found rpmbuild, trying to build RedHat/CentOS package.

			rm -f /tmp/zerotier-one.spec
			curr_dir=`pwd`
			cat ext/installfiles/linux/RPM/zerotier-one.spec.in | sed "s/__VERSION__/${vmajor}.${vminor}.${revision}/g" | sed "s/__INSTALLER__/${targ}/g" >/tmp/zerotier-one.spec

			rpmbuild -ba /tmp/zerotier-one.spec

			rm -f /tmp/zerotier-one.spec
		fi

		;;

	*)
		echo "Unsupported platform: $system"
		exit 2

esac

rm -rf build-installer

exit 0