#!/bin/bash
#
# Author: Georg Voell - georg.voell@oracle.com
# Version: @(#)check-tools 1.0.0 23.08.2020 (c)2020 Oracle
# Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl/
#
#@  This script installs Python3 and Java 8 (using yum - supported platforms: OL and Red Hat)
#@
#@Usage: check-tools [options] [action]
#@  Options: -h, --help                 : Displays helptext.
#@           -v, --version              : Displays the version of the script.
#@  Action:
#@    install: Install the tools if they are not already installed.
#
# Exit codes:
#  01: Unknown or wrong parameter.
#  02: Unsupported platform.
#  03: Unknown action.
#  04: Action failed.
#
# Update history:
#
# V 1.0.0 23.08.2020 New version
#

script=${0}						# Name of this script
progstr=`basename "$script"`	# Basename of the script
progdir=`dirname "$script"`		# Dirname of the script
libfile=`filecheck -x lib.bash`	# Find location of library
source "$libfile"				# Include default bash library
PATH="$WORKPATH"				# Set PATH to something useful

### Functions

# Install required tool via RPM
function InstallTool() {
	tool=${1}
	package=${2}
	
	installed=`filecheck -x "$tool"`
	if [ "$installed" = "" ]; then
		echo "Installing $tool"
		if [ "$USER" = "root" ]; then
			yum –y install "$package"
			stat=$?
		else
			sudo yum –y install "$package"
			stat=$?
		fi
		
		if [ $stat -eq 0 ]; then
			echo "Tool '$tool' installed."
		else
			errormsg 4 "Installing '$tool' failed." "Exit code: '$stat'"
			return 4
		fi
	else
		echo "Tool '$tool' already installed: '$installed'."
	fi
	
	return 0
}

### Parameter check

# Check parameters: Loop until all parameters are used up
while [ $# -gt 0 ]; do
	pname=${1}
	case "$pname" in
		-v | --version)
			shift
			showversion=1
			;;
		-h | --help)
			shift
			showhelp=1
			;;
		*)
			paramck=`echo "$1" | grep '^-'` # Types don't begin with '-'
			if [ "$param" = "" -a "$paramck" = "" ]; then
				param=`echo "$1" | tr "[:upper:]" "[:lower:]"`
			else
				errstr="Unknown second parameter: '$1'."
			fi
			shift
	esac
done

# Plausibility check
if [ "$param" = "" ]; then
	errstr="No action specified."
fi

# Display help or error message
DisplayHelp

### Main

# We only run on Linux
if [ "$OS" != "Linux" ]; then
	exitcode=2
	errormsg $exitcode "Sorry, script '$progstr' supports Linux only."
else
	case "$param" in
		install)
			# Check if we have yum available
			yum=`filecheck -x yum`

			if [ "$yum" = "" ]; then
				# No yum - maybe other Linux than OL or Red Hat?
				exitcode=2
				errormsg $exitcode "Sorry, no 'yum' in PATH."
			else
				# We need to be root or can do "sudo"
				ok=0
				if [ "$USER" != "root" ]; then
					check-sudo
					stat=$?
				
					if [ $stat -eq 0 ]; then
						ok=1
					fi
				else
					ok=1
				fi
				
				if [ $ok -gt 0 ]; then
					InstallTool python3 "python3 python3-libs python3-setuptools python3-pip"
					exitcode=$?
					if [ $exitcode -eq 0 ]; then
						InstallTool java "java-1.8.0-openjdk"
						exitcode=$?
					fi
				fi
			fi
			;;
		*)
			exitcode=3
			errormsg $exitcode "Unknown action '$param'."
	esac
fi

# Cleanup and exit
Cleanup
exit $exitcode