Protobuf: prettified pre-build.sh. Now checking return codes of subroutines properly, exiting on errors. Returning error code properly

proto/pre-build.sh

@@ -2,8 +2,11 @@
 
 lprotoc="/usr/local/lib/libprotoc.so"
 lprotobuf="/usr/local/lib/libprotobuf.so"
-ok=1
+srcdir='google_protobuf'
+ok=0
 missing=""
+red='\033[0;31m'
+nc='\033[0m'
 
 if [ ! -e "$lprotoc" ]; then
 	ok=0
@@ -15,39 +18,73 @@ if [ ! -e "$lprotobuf" ]; then
 	missing="$missing $lprotobuf"
 fi
 
-if [ "$ok" == 0 ]; then
-	echo "$missing, required for building, is not found" \
-"You have to build and install latest Protobuf version from https://github.com/google/protobuf" \
-"Do you want to do it automatically?  [y/n]" \
-"(Caution: this will take decent amount of time and internet traffic)"
-	response="n"
-	read response
-	if [ $response = "y" ]; then
-		echo "Creating directory for Protobuf sources"
-		mkdir protobuf_sources
-		cd protobuf_sources
-
-		echo "Cloning repository"
-		git clone https://github.com/google/protobuf
-		cd protobuf
-
-		echo "Resolving prerequisites to build Google Protobuf"
-		sudo apt-get install autoconf automake libtool curl make g++ unzip
-
-		echo "Generating Makefiles and etc."
-		./autogen.sh
-		./configure
-
-		echo "Building"
-		make
-
-		echo "Installing"
-		sudo make install
-
-		echo "Cleaning"
-		# cd ../..
-		# rm -rf protobuf_sources
-	fi
-else
+if [ "$ok" == 1 ]; then
 	echo "Prerequisites met, you can build library now via Makefile"
+	exit 0
 fi
+
+echo "$missing, required for building, is not found"
+echo "You have to build and install latest Protobuf version from https://github.com/google/protobuf"
+echo "Do you want to do it automatically?  [y/n]"
+echo "(Caution: this will take decent amount of time and internet traffic)"
+response="n"
+read response
+if [ $response = "n" ]; then
+	exit 1
+fi
+
+echo -e "${red}Creating directory for Protobuf sources${nc}"
+mkdir $srcdir
+if [ $? -ne 0 ]; then
+	echo -e "${red}Error creating directory protobuf_sources/ for cloning repository${nc}"
+	exit 1
+fi
+cd $srcdir
+
+echo -e "${red}Cloning repository${nc}"
+git clone https://github.com/google/protobuf
+if [ $? -ne 0 ]; then
+	echo -e "${red}Error cloning https://github.com/google/protobuf${nc}"
+	exit 1
+fi
+
+cd protobuf
+
+echo -e "${red}Resolving prerequisites to build Google Protobuf${nc}"
+sudo apt-get install autoconf automake libtool curl make g++ unzip
+if [ $? -ne 0 ]; then
+	echo -e "${red}Error installing tools for building${nc}"
+	exit 1
+fi
+
+echo -e "${red}Generating Makefiles and etc.${nc}"
+./autogen.sh
+./configure
+if [ $? -ne 0 ]; then
+	echo -e "${red}Error generating makefiles${nc}"
+	exit 1
+fi
+
+echo -e "${red}Building${nc}"
+make
+if [ $? -ne 0 ]; then
+	echo -e "${red}Error building protobuf via Make${nc}"
+	exit 1
+fi
+
+echo -e "${red}Installing${nc}"
+sudo make install
+if [ $? -ne 0 ]; then
+	echo -e "${red}Error installing protobuf${nc}"
+	exit 1
+fi
+
+echo -e "${red}Refreshing dynamic libraries bindings${nc}"
+sudo ldconfig
+if [ $? -ne 0 ]; then
+	echo -e "${red}Error refreshing dynamic libraries${nc}"
+	exit 1
+fi
+
+echo -e "${red}Installation finished succesfully. You can now build library using Makefile.${nc}"
+exit 0