darwin: added check for cmake cache file in eos/ doc root

eosio_build.sh

@@ -35,6 +35,10 @@
 		printf "\\n\\tPlease cd into directory %s to run this script.\\n \\tExiting now.\\n\\n" "${CWD}"
 		exit 1
 	fi
+	if [ -f "${PWD}/CMakeCache.txt" ]; then
+		printf "\\n\\tPlease remove file %s/CMakeCache.txt before building EOS.IO.\\n \\tExiting now.\\n\\n" "${PWD}"
+		exit 1
+	fi
 
    	function usage()
    	{ 

scripts/eosio_build_darwin.sh

-	OS_VER=`sw_vers -productVersion`
-	OS_MAJ=`echo "${OS_VER}" | cut -d'.' -f1`
-	OS_MIN=`echo "${OS_VER}" | cut -d'.' -f2`
-	OS_PATCH=`echo "${OS_VER}" | cut -d'.' -f3`
+	OS_VER=$(sw_vers -productVersion)
+	OS_MAJ=$(echo "${OS_VER}" | cut -d'.' -f1)
+	OS_MIN=$(echo "${OS_VER}" | cut -d'.' -f2)
+	OS_PATCH=$(echo "${OS_VER}" | cut -d'.' -f3)
 
-	MEM_GIG=`bc <<< "($(sysctl -in hw.memsize) / 1024000000)"`
+	MEM_GIG=$(bc <<< "($(sysctl -in hw.memsize) / 1024000000)")
 
-	CPU_SPEED=`bc <<< "scale=2; ($(sysctl -in hw.cpufrequency) / 10^6) / 10"`
+	CPU_SPEED=$(bc <<< "scale=2; ($(sysctl -in hw.cpufrequency) / 10^6) / 10")
 	CPU_CORE=$( sysctl -in machdep.cpu.core_count )
 
-	blksize=`df . | head -1 | awk '{print $2}' | cut -d- -f1`
-	gbfactor=$(( 1073741824 / $blksize ))
-	total_blks=`df . | tail -1 | awk '{print $2}'`
-	avail_blks=`df . | tail -1 | awk '{print $4}'`
-	DISK_TOTAL=$(($total_blks / $gbfactor ))
-	DISK_AVAIL=$(($avail_blks / $gbfactor ))
+	DISK_INSTALL=$(df -h . | tail -1 | tr -s ' ' | cut -d\  -f1 || cut -d' ' -f1)
+	blksize=$(df . | head -1 | awk '{print $2}' | cut -d- -f1)
+	gbfactor=$(( 1073741824 / blksize ))
+	total_blks=$(df . | tail -1 | awk '{print $2}')
+	avail_blks=$(df . | tail -1 | awk '{print $4}')
+	DISK_TOTAL=$((total_blks / gbfactor ))
+	DISK_AVAIL=$((avail_blks / gbfactor ))
 
-	printf "\n\tOS name: $ARCH\n"
-	printf "\tOS Version: ${OS_VER}\n"
-	printf "\tCPU speed: ${CPU_SPEED}Ghz\n"
-	printf "\tCPU cores: $CPU_CORE\n"
-	printf "\tPhysical Memory: $MEM_GIG Gbytes\n"
-	printf "\tDisk space total: ${DISK_TOTAL}G\n"
-	printf "\tDisk space available: ${DISK_AVAIL}G\n\n"
+	printf "\\n\\tOS name: %s\\n" "${ARCH}"
+	printf "\\tOS Version: %s\\n" "${OS_VER}"
+	printf "\\tCPU speed: %sGhz\\n" "${CPU_SPEED}"
+	printf "\\tCPU cores: %s\\n" "${CPU_CORE}"
+	printf "\\tPhysical Memory: %s Gbytes\\n" "${MEM_GIG}"
+	printf "\\tDisk install: %s\\n" "${DISK_INSTALL}"
+	printf "\\tDisk space total: %sG\\n" "${DISK_TOTAL}"
+	printf "\\tDisk space available: %sG\\n\\n" "${DISK_AVAIL}"
 
-	if [ $MEM_GIG -lt 7 ]; then
+	if [ "${MEM_GIG}" -lt 7 ]; then
 		echo "Your system must have 7 or more Gigabytes of physical memory installed."
 		echo "Exiting now."
 		exit 1
 	fi
 
-	if [ $OS_MIN -lt 12 ]; then
+	if [ "${OS_MIN}" -lt 12 ]; then
 		echo "You must be running Mac OS 10.12.x or higher to install EOSIO."
 		echo "Exiting now."
 		exit 1
 	fi
 
-	if [ $DISK_AVAIL -lt $DISK_MIN ]; then
+	if [ "${DISK_AVAIL}" -lt "$DISK_MIN" ]; then
 		echo "You must have at least ${DISK_MIN}GB of available storage to install EOSIO."
 		echo "Exiting now."
 		exit 1
 	fi
 
-	printf "\tChecking XCode installation\n"
-	XCODESELECT=$(which xcode-select)
-	if [ $? -ne 0 ]; then
-		printf "\n\tXCode must be installed in order to proceed.\n\n"
-		printf "\texiting now.\n"
+	printf "\\tChecking xcode-select installation\\n"
+	if ! XCODESELECT=$( command -v xcode-select)
+	then
+		printf "\\n\\tXCode must be installed in order to proceed.\\n\\n"
+		printf "\\tExiting now.\\n"
 		exit 1
 	fi
 
-	printf "\tXCode installation found.\n\n"
+	printf "\\txcode-select installation found @ \\n"
+	printf "\\t%s \\n\\n" "${XCODESELECT}"
 
-	printf "\tChecking Ruby installation\n"
-	RUBY=$(which ruby)
-	if [ $? -ne 0 ]; then
-		printf "\nRuby must be installed in order to proceed.\n\n"
-		printf "\texiting now.\n"
+	printf "\\tChecking Ruby installation.\\n"
+	if ! RUBY=$( command -v ruby)
+	then
+		printf "\\nRuby must be installed in order to proceed.\\n\\n"
+		printf "\\tExiting now.\\n"
 		exit 1
 	fi
 
-	printf "\tRuby installation found.\n\n"
-	
-	printf "\tChecking Home Brew installation\n"
-	BREW=$(which brew)
-	if [ $? -ne 0 ]; then
-		printf "\tHomebrew must be installed to compile EOS.IO\n\n"
-		printf "\tDo you wish to install Home Brew?\n"
+	printf "\\tRuby installation found @ \\n"
+	printf "\\t%s \\n\\n" "${RUBY}"
+
+	printf "\\tChecking Home Brew installation\\n"
+	if ! BREW=$( command -v brew )
+	then
+		printf "\\tHomebrew must be installed to compile EOS.IO\\n\\n"
+		printf "\\tDo you wish to install Home Brew?\\n"
 		select yn in "Yes" "No"; do
-			case $yn in
+			case "${yn}" in
 				[Yy]* ) 
-				$XCODESELECT --install 2>/dev/null;
-				$RUBY -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
-				if [ $? -ne 0 ]; then
+				"${XCODESELECT}" --install 2>/dev/null;
+				if ! "${RUBY}" -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+				then
 					echo "Unable to install homebrew at this time. Exiting now."
 					exit 1;
 				fi
@@ -83,82 +87,80 @@
 		done
 	fi
 
-	printf "\tHome Brew installation found.\n\n"
+	printf "\\tHome Brew installation found @\\n"
+	printf "\\t%s\\n\\n" "${BREW}"
+	
 	COUNT=1
 	PERMISSION_GETTEXT=0
-	BOOST_CHECK=0
 	DISPLAY=""
 	DEP=""
 
-	printf "\tChecking dependencies.\n"
-	var_ifs=${IFS}
-	IFS=','
+	printf "\\tChecking dependencies.\\n"
+	var_ifs="${IFS}"
+	IFS=","
 	while read -r name tester testee brewname uri
 	do
-		printf "\tChecking $name ... "
-		if [ ${tester} ${testee} ]; then
-			printf '\t\t %s found\n' "$name"
+		printf "\\tChecking %s ... " "${name}"
+		if [ "${tester}" "${testee}" ]; then
+			printf "\\t\\t %s found\\n" "${name}"
 			continue
 		fi
 		# resolve conflict with homebrew glibtool and apple/gnu installs of libtool
-		if [ ${testee} == "/usr/local/bin/glibtool" ]; then
-			if [ ${tester} "/usr/local/bin/libtool" ]; then
-				printf '\t\t %s found\n' "$name"
+		if [ "${testee}" == "/usr/local/bin/glibtool" ]; then
+			if [ "${tester}" "/usr/local/bin/libtool" ]; then
+				printf "\\t\\t %s found\\n" "${name}"
 				continue
 			fi
 		fi
-		if [ $brewname = "gettext" ]; then
+		if [ "${brewname}" = "gettext" ]; then
 			PERMISSION_GETTEXT=1
 		fi
 		DEP=$DEP"${brewname} "
-		DISPLAY="${DISPLAY}${COUNT}. ${name}\n\t"
-		printf "\t\t ${name} ${bldred}NOT${txtrst} found.\n"
-		let COUNT++
+		DISPLAY="${DISPLAY}${COUNT}. ${name}\\n\\t"
+		printf "\\t\\t %s ${bldred}NOT${txtrst} found.\\n" "${name}"
+		(( COUNT++ ))
 	done < scripts/eosio_build_dep
-	IFS=${var_ifs}
+	IFS="${var_ifs}"
 		
-	printf "\tChecking Python3 ... "
-	if [  -z `python3 -c 'import sys; print(sys.version_info.major)' 2>/dev/null` ]; then
+	printf "\\tChecking Python3 ... "
+	if [  -z "$( python3 -c 'import sys; print(sys.version_info.major)' 2>/dev/null )" ]; then
 		DEP=$DEP"python@3 "
-		DISPLAY="${DISPLAY}${COUNT}. Python 3\n\t"
-		printf "\t\t python3 ${bldred}NOT${txtrst} found.\n"
-		let DCOUNT++
+		DISPLAY="${DISPLAY}${COUNT}. Python 3\\n\\t"
+		printf "\\t\\t python3 ${bldred}NOT${txtrst} found.\\n"
+		(( DCOUNT++ ))
 	else
-		printf "\t\t Python3 found\n"
+		printf "\\t\\t Python3 found\\n"
 	fi
 
 	if [ $COUNT -gt 1 ]; then
-		printf "\n\tThe following dependencies are required to install EOSIO.\n"
-		printf "\n\t$DISPLAY\n\n"
+		printf "\\n\\tThe following dependencies are required to install EOSIO.\\n"
+		printf "\\n\\t%s\\n\\n" "${DISPLAY}"
 		echo "Do you wish to install these packages?"
 		select yn in "Yes" "No"; do
 			case $yn in
 				[Yy]* ) 
 					if [ $PERMISSION_GETTEXT -eq 1 ]; then
-						sudo chown -R $(whoami) /usr/local/share
+						sudo chown -R "$(whoami)" /usr/local/share
 					fi
-					$XCODESELECT --install 2>/dev/null;
-					printf "\tUpdating Home Brew.\n"
-					brew update
-					if [ $? -ne 0 ]; then
-						printf "\tUnable to update Home Brew at this time.\n"
-						printf "\tExiting now.\n\n"
+					"${XCODESELECT}" --install 2>/dev/null;
+					printf "\\tUpdating Home Brew.\\n"
+					if ! brew update
+					then
+						printf "\\tUnable to update Home Brew at this time.\\n"
+						printf "\\tExiting now.\\n\\n"
 						exit 1;
 					fi
-					printf "\tInstalling Dependencies.\n"
-					if [ "${BOOST_CHECK}" = 1 ]; then
-						brew remove boost
-					fi 
-					brew install --force $DEP
-					if [ $? -ne 0 ]; then
-						printf "\tHomebrew exited with the above errors.\n"
-						printf "\tExiting now.\n\n"
+					printf "\\tInstalling Dependencies.\\n"
+					if ! "${BREW}" install --force "${DEP}"
+					then
+						printf "\\tHomebrew exited with the above errors.\\n"
+						printf "\\tExiting now.\\n\\n"
 						exit 1;
 					fi
-					brew unlink $DEP && brew link --force $DEP
-					if [ $? -ne 0 ]; then
-						printf "\tHomebrew exited with the above errors.\n"
-						printf "\tExiting now.\n\n"
+					if ! "${BREW}" unlink "{DEP}" && "${BREW}" link --force "${DEP}"
+					then
+						printf "\\tHomebrew exited with the above errors.\\n"
+						printf "\\tExiting now.\\n\\n"
 						exit 1;
 					fi
 				break;;
@@ -167,41 +169,42 @@
 			esac
 		done
 	else 
-		printf "\n\tNo required Home Brew dependencies to install.\n"
+		printf "\\n\\tNo required Home Brew dependencies to install.\\n"
 	fi
+
 		
-	printf "\n\tChecking boost library installation.\n"
-	BVERSION=`cat "/usr/local/include/boost/version.hpp" 2>/dev/null | grep "#define BOOST_VERSION" | tail -1 | tr -s ' ' | cut -d\  -f3`
+	printf "\\n\\tChecking boost library installation.\\n"
+	BVERSION=$( grep "#define BOOST_VERSION" "/usr/local/include/boost/version.hpp" 2>/dev/null | tail -1 | tr -s ' ' | cut -d\  -f3 )
 	if [ "${BVERSION}" != "106600" ]; then
 		if [ ! -z "${BVERSION}" ]; then
-			printf "\tFound Boost Version ${BVERSION}.\n"
-			printf "\tEOS.IO requires Boost version 1.66.\n"
-			printf "\tWould you like to uninstall version ${BVERSION} and install Boost version 1.66.\n"
+			printf "\\tFound Boost Version %s.\\n" "${BVERSION}"
+			printf "\\tEOS.IO requires Boost version 1.66.\\n"
+			printf "\\tWould you like to uninstall version %s and install Boost version 1.66.\\n" "${BVERSION}"
 			select yn in "Yes" "No"; do
 				case $yn in
 					[Yy]* )
 						if brew list | grep "boost"
 						then 
-							printf "\tUnlinking Boost Version ${BVERSION}.\n"
-							echo unlinking boost "${BVERSION}"				
-							if ! brew unlink boost
+							printf "\\tUnlinking Boost Version %s.\\n" "${BVERSION}"
+							printff "\\tunlinking boost %s\\n" "${BVERSION}"				
+							if ! "${BREW}" unlink boost
 							then
-								printf "\tUnable to remove boost libraries at this time. 0\n"
-								printf "\tExiting now.\n\n"
+								printf "\\tUnable to remove boost libraries at this time. 0\\n"
+								printf "\\tExiting now.\\n\\n"
 								exit 1;
 							fi
 						else
-							printf "\tRemoving Boost Version ${BVERSION}.\n"
-							sudo rm -rf "${BOOST_ROOT}/include/boost"
-							if [ $? -ne 0 ]; then
-								printf "\tUnable to remove boost libraries at this time. 1\n"
-								printf "\tExiting now.\n\n"
+							printf "\\tRemoving Boost Version %s.\\n" "${BVERSION}"
+							if ! sudo rm -rf "${BOOST_ROOT}/include/boost"
+							then
+								printf "\\tUnable to remove boost libraries at this time. 1\\n"
+								printf "\\tExiting now.\\n\\n"
 								exit 1;
 							fi
-							sudo rm -rf "${BOOST_ROOT}/lib/libboost*"
-							if [ $? -ne 0 ]; then
-								printf "\tUnable to remove boost libraries at this time. 2\n"
-								printf "\tExiting now.\n\n"
+							if ! sudo rm -rf "${BOOST_ROOT}/lib/libboost*"
+							then
+								printf "\\tUnable to remove boost libraries at this time. 2\\n"
+								printf "\\tExiting now.\\n\\n"
 								exit 1;
 							fi
 						fi
@@ -211,170 +214,302 @@
 				esac
 			done
 		fi
-		printf "\tInstalling boost libraries.\n"
+		printf "\\tInstalling boost libraries.\\n"
 		if [ ! -d "/usr/local/Cellar/boost/1.66.0" ]; then
 			if ! brew install "https://raw.githubusercontent.com/Homebrew/homebrew-core/76a83d798d76aa43459ceb145b721ba4a16a54a6/Formula/boost.rb"
 			then
-				printf "\tUnable to install boost 1.66 libraries at this time. 0\n"
-				printf "\tExiting now.\n\n"
-				exit;
+				printf "\\tUnable to install boost 1.66 libraries at this time. 0\\n"
+				printf "\\tExiting now.\\n\\n"
+				exit 1;
 			fi
-			printf "\tPinning boost libraries.\n"
+			printf "\\tPinning boost libraries.\\n"
 			if ! brew pin boost
 			then
-				printf "\tUnable to pin boost libraries at this time. 2\n"
-				printf "\tExiting now.\n\n"
-				exit;
+				printf "\\tUnable to pin boost libraries at this time. 2\\n"
+				printf "\\tExiting now.\\n\\n"
+				exit 1;
 			fi
 		else
 			if ! brew switch boost 1.66.0
 			then
-				printf "\tUnable to swtich boost libraries to 1.66.0 at this time. 1\n"
-				printf "\tExiting now.\n\n"
+				printf "\\tUnable to swtich boost libraries to 1.66.0 at this time. 1\\n"
+				printf "\\tExiting now.\\n\\n"
 				exit;
 			fi
 		fi
-		printf "\tBoost 1.66.0 successfully installed @ /usr/local.\n"
+		printf "\\tBoost 1.66.0 successfully installed @ /usr/local.\\n"
 	else
-		printf "\tBoost 1.66.0 found at /usr/local.\n"
+		printf "\\tBoost 1.66.0 found at /usr/local.\\n"
 	fi
 
-	printf "\n\tChecking MongoDB C++ driver installation.\n"
-    if [ ! -e /usr/local/lib/libmongocxx-static.a ]; then
-		cd ${TEMP_DIR}
-		brew install --force pkgconfig
-		brew unlink pkgconfig && brew link --force pkgconfig
+	printf "\\n\\tChecking MongoDB C++ driver installation.\\n"
+    if [ ! -e "/usr/local/lib/libmongocxx-static.a" ]; then
+		if ! cd "${TEMP_DIR}"
+		then
+			printf "\\tUnable to enter directory %s.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! pkgconfig=$( "${BREW}" list | grep pkg-config )
+		then
+			if ! "${BREW}" install --force pkg-config
+			then
+				printf "\\tHomebrew returned an error installing pkg-config.\\n"
+				printf "\\tExiting now.\\n\\n"
+				exit 1;
+			fi
+			if ! "${BREW}" unlink pkg-config && "${BREW}" link --force pkg-config
+			then
+				printf "\\tHomebrew returned an error linking pkgconfig.\\n"
+				printf "\\tExiting now.\\n\\n"
+				exit 1;
+			fi
+		fi
 		STATUS=$(curl -LO -w '%{http_code}' --connect-timeout 30 https://github.com/mongodb/mongo-c-driver/releases/download/1.9.3/mongo-c-driver-1.9.3.tar.gz)
 		if [ "${STATUS}" -ne 200 ]; then
-			rm -f ${TEMP_DIR}/mongo-c-driver-1.9.3.tar.gz
-			printf "\tUnable to download MongoDB C driver at this time.\n"
-			printf "\tExiting now.\n\n"
-			exit;
-		fi
-		tar xf mongo-c-driver-1.9.3.tar.gz
-		rm -f ${TEMP_DIR}/mongo-c-driver-1.9.3.tar.gz
-		cd mongo-c-driver-1.9.3
-		./configure --enable-static --with-libbson=bundled --enable-ssl=darwin --disable-automatic-init-and-cleanup --prefix=/usr/local
-		if [ $? -ne 0 ]; then
-			printf "\tConfiguring MongoDB C driver has encountered the errors above.\n"
-			printf "\tExiting now.\n\n"
-			exit;
-		fi
-		make -j${CPU_CORE}
-		if [ $? -ne 0 ]; then
-			printf "\tError compiling MongoDB C driver.\n"
-			printf "\tExiting now.\n\n"
-			exit;
-		fi
-		sudo make install
-		if [ $? -ne 0 ]; then
-			printf "\tError installing MongoDB C driver.\nMake sure you have sudo privileges.\n"
-			printf "\tExiting now.\n\n"
-			exit;
-		fi
-		cd ..
-		rm -rf ${TEMP_DIR}/mongo-c-driver-1.9.3
-		cd ${TEMP_DIR}
-		rm -rf ${TEMP_DIR}/mongo-cxx-driver
-		git clone https://github.com/mongodb/mongo-cxx-driver.git --branch releases/stable --depth 1
-		if [ $? -ne 0 ]; then
-			printf "\tUnable to clone MongoDB C++ driver at this time.\n"
-			printf "\tExiting now.\n\n"
-			exit;
-		fi
-		cd mongo-cxx-driver/build
-		cmake -DBUILD_SHARED_LIBS=OFF -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local ..
-		if [ $? -ne 0 ]; then
-			printf "\tCmake has encountered the above errors building the MongoDB C++ driver.\n"
-			printf "\tExiting now.\n\n"
-			exit;
-		fi
-		make -j${CPU_CORE}
-		if [ $? -ne 0 ]; then
-			printf "\tError compiling MongoDB C++ driver.\n"
-			printf "\tExiting now.\n\n"
-			exit;
-		fi
-		sudo make install
-		if [ $? -ne 0 ]; then
-			printf "\tError installing MongoDB C++ driver.\nMake sure you have sudo privileges.\n"
-			printf "\tExiting now.\n\n"
-			exit;
-		fi
-		cd
-		rm -rf ${TEMP_DIR}/mongo-cxx-driver
+			if ! rm -f "${TEMP_DIR}/mongo-c-driver-1.9.3.tar.gz"
+			then
+				printf "\\tUnable to remove file %s/mongo-c-driver-1.9.3.tar.gz.\\n" "${TEMP_DIR}"
+			fi
+			printf "\\tUnable to download MongoDB C driver at this time.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! tar xf mongo-c-driver-1.9.3.tar.gz
+		then
+			printf "\\tUnable to unarchive file mongo-c-driver-1.9.3.tar.gz.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! rm -f "${TEMP_DIR}/mongo-c-driver-1.9.3.tar.gz"
+		then
+			printf "\\tUnable to remove file mongo-c-driver-1.9.3.tar.gz.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! cd mongo-c-driver-1.9.3
+		then
+			printf "\\tUnable to cd into directory %s/mongo-c-driver-1.9.3.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! ./configure --enable-static --with-libbson=bundled --enable-ssl=darwin --disable-automatic-init-and-cleanup --prefix=/usr/local
+		then
+			printf "\\tConfiguring MongoDB C driver has encountered the errors above.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! make -j"${CPU_CORE}"
+		then
+			printf "\\tError compiling MongoDB C driver.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! sudo make install
+		then
+			printf "\\tError installing MongoDB C driver.\\nMake sure you have sudo privileges.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! cd "${TEMP_DIR}"
+		then
+			printf "\\tUnable to enter directory %s.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! rm -rf "${TEMP_DIR}/mongo-c-driver-1.9.3"
+		then
+			printf "\\tUnable to remove directory %s/mongo-c-driver-1.9.3.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! git clone https://github.com/mongodb/mongo-cxx-driver.git --branch releases/stable --depth 1
+		then
+			printf "\\tUnable to clone MongoDB C++ driver at this time.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! cd "${TEMP_DIR}/mongo-cxx-driver/build"
+		then
+			printf "\\tUnable to enter directory %s/mongo-cxx-driver/build.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! cmake -DBUILD_SHARED_LIBS=OFF -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local ..
+		then
+			printf "\\tCmake has encountered the above errors building the MongoDB C++ driver.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! make -j"${CPU_CORE}"
+		then
+			printf "\\tError compiling MongoDB C++ driver.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! sudo make install
+		then
+			printf "\\tError installing MongoDB C++ driver.\\nMake sure you have sudo privileges.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! cd "${TEMP_DIR}"
+		then
+			printf "\\tUnable to enter directory %s.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! rm -rf "${TEMP_DIR}/mongo-cxx-driver"
+		then
+			printf "\\tUnable to remove directory %s/mongo-cxx-driver.\\n" "${TEMP_DIR}" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		printf "\\tMongo C++ driver installed at /usr/local/lib/libmongocxx-static.a.\\n"
 	else
-		printf "\tMongo C++ driver found at /usr/local/lib/libmongocxx-static.a.\n"
+		printf "\\tMongo C++ driver found at /usr/local/lib/libmongocxx-static.a.\\n"
 	fi
 
-	printf "\n\tChecking secp256k1-zkp installation.\n"
+	printf "\\n\\tChecking secp256k1-zkp installation.\\n"
     # install secp256k1-zkp (Cryptonomex branch)
-    if [ ! -e /usr/local/lib/libsecp256k1.a ]; then
-		cd ${TEMP_DIR}
-		git clone https://github.com/cryptonomex/secp256k1-zkp.git
-		if [ $? -ne 0 ]; then
-			printf "\tUnable to clone repo secp256k1-zkp @ https://github.com/cryptonomex/secp256k1-zkp.git.\n"
-			printf "\tExiting now.\n\n"
-			exit;
-		fi
-		cd secp256k1-zkp
-		./autogen.sh
-		if [ $? -ne 0 ]; then
-			printf "\tError running autogen\n"
-			printf "\tExiting now.\n\n"
-			exit;
-		fi
-		./configure
-		make -j${CPU_CORE}
-		if [ $? -ne 0 ]; then
-			printf "\tError compiling secp256k1-zkp.\n"
-			printf "\tExiting now.\n\n"
-			exit;
-		fi
-		sudo make install
-		rm -rf ${TEMP_DIR}/secp256k1-zkp
+    if [ ! -e "/usr/local/lib/libsecp256k1.a" ]; then
+		if ! cd "${TEMP_DIR}"
+		then
+			printf "\\tUnable to enter directory %s.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! git clone https://github.com/cryptonomex/secp256k1-zkp.git
+		then
+			printf "\\tUnable to clone repo secp256k1-zkp @ https://github.com/cryptonomex/secp256k1-zkp.git.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! cd "${TEMP_DIR}/secp256k1-zkp"
+		then
+			printf "\\tUnable to enter directory %s/secp256k1-zkp.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! ./autogen.sh
+		then
+			printf "\\tError running autogen.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! ./configure
+		then
+			printf "\\tConfiguring secp256k1-zkp has returned the above error.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! make -j"${CPU_CORE}"
+		then
+			printf "\\tError compiling secp256k1-zkp.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! sudo make install
+		then
+			printf "\\tInstalling secp256k1-zkp has returned the above error.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! rm -rf "${TEMP_DIR}/secp256k1-zkp"
+		then
+			printf "\\tUnable to remove directory %s/secp256k1-zkp56k1-zkp.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		printf "\\n\\n\\tSuccessffully installed secp256k1 @ /usr/local/lib/.\\n\\n"
 	else
-		printf "\tsecp256k1 found at /usr/local/lib/\n"
+		printf "\\tsecp256k1 found at /usr/local/lib/.\\n"
 	fi
   
-	printf "\n\tChecking LLVM with WASM support.\n"
+	printf "\\n\\tChecking LLVM with WASM support.\\n"
 	if [ ! -d /usr/local/wasm/bin ]; then
-		cd ${TEMP_DIR}
-		mkdir wasm-compiler
-		cd wasm-compiler
-		git clone --depth 1 --single-branch --branch release_40 https://github.com/llvm-mirror/llvm.git
-		if [ $? -ne 0 ]; then
-			printf "\tUnable to clone llvm repo @ https://github.com/llvm-mirror/llvm.git.\n"
-			printf "\tExiting now.\n\n"
-			exit;
-		fi
-		cd llvm/tools
-		git clone --depth 1 --single-branch --branch release_40 https://github.com/llvm-mirror/clang.git
-		if [ $? -ne 0 ]; then
-			printf "\tUnable to clone clang repo @ https://github.com/llvm-mirror/clang.git.\n"
-			printf "\tExiting now.\n\n"
-			exit;
-		fi
-		cd ..
-		mkdir build
-		cd build
-		sudo cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=/usr/local/wasm \
+		if ! cd "${TEMP_DIR}"
+		then
+			printf "\\tUnable to enter directory %s.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! mkdir "${TEMP_DIR}/wasm-compiler"
+		then
+			printf "\\tUnable to create directory %s/wasm-compiler.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! cd "${TEMP_DIR}/wasm-compiler"
+		then
+			printf "\\tUnable to enter directory %s/wasm-compiler.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! git clone --depth 1 --single-branch --branch release_40 https://github.com/llvm-mirror/llvm.git
+		then
+			printf "\\tUnable to clone llvm repo @ https://github.com/llvm-mirror/llvm.git.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! cd "${TEMP_DIR}/wasm-compiler/llvm/tools"
+		then
+			printf "\\tUnable to enter directory %s/wasm-compiler/llvm/tools.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! git clone --depth 1 --single-branch --branch release_40 https://github.com/llvm-mirror/clang.git
+		then
+			printf "\\tUnable to clone clang repo @ https://github.com/llvm-mirror/clang.git.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! cd "${TEMP_DIR}/wasm-compiler/llvm"
+		then
+			printf "\\tUnable to enter directory %s/wasm-compiler/llvm.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! mkdir "${TEMP_DIR}/wasm-compiler/llvm/build"
+		then
+			printf "\\tUnable to create directory %s/wasm-compiler/llvm/build.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! cd "${TEMP_DIR}/wasm-compiler/llvm/build"
+		then
+			printf "\\tUnable to enter directory %s/wasm-compiler/llvm/build.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=/usr/local/wasm \
 		-DLLVM_TARGETS_TO_BUILD= -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly \
 		-DCMAKE_BUILD_TYPE=Release ../
-		if [ $? -ne 0 ]; then
-			printf "\tError compiling WASM.\n"
-			printf "\tExiting now.\n\n"
-			exit;
+		then
+			printf "\\tError compiling LLVM/Clang with WASM support.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! sudo make -j"${CPU_CORE}" install
+		then
+			printf "\\tCompiling LLVM/Clang with WASM support has exited with the error above.\\n"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
+		fi
+		if ! sudo rm -rf "${TEMP_DIR}/wasm-compiler"
+		then
+			printf "\\tUnable to remove directory %s/wasm-compiler.\\n" "${TEMP_DIR}"
+			printf "\\tExiting now.\\n\\n"
+			exit 1;
 		fi
-		sudo make -j${CPU_CORE} install
-		sudo rm -rf ${TEMP_DIR}/wasm-compiler
+		printf "\\tSuccessfully installed LLVM/Clang with WASM support @ /usr/local/wasm/bin/.\\n"
 	else
-		printf "\tWASM found at /usr/local/wasm/bin/\n"
+		printf "\\tWASM found at /usr/local/wasm/bin/.\\n"
 	fi
 
 	function print_instructions()
 	{
-		printf "\n\t$( which mongod ) -f ${MONGOD_CONF} &\n"
-		printf "\tcd ${BUILD_DIR}; make test\n\n"
+		printf "\\n\\t%s -f %s &\\n" "$( command -v mongod )" "${MONGOD_CONF}"
+		printf "\\tcd %s; make test\\n\\n" "${BUILD_DIR}"
 	return 0
 	}