#!/bin/bash

# Script:	patchme.bash
# Task:		automatically search and apply patches in a TSP medium
# Author:	Benjamin 'blindcoder' Schieder
# Version:	0.1-20090322

# global variables
SCRIPTNAME=$(basename ${0} .bash)

EXIT_SUCCESS=0
EXIT_FAILURE=1
EXIT_ERROR=2
EXIT_BUG=10

# variables for option switches with default values
VERBOSE="n"
OPTFILE=""
PATCHFILE="/tmp/patches.txt"
MEDIUM="$( ls -d /export/home/*/. | head -n 1 )"
UNZIPPARAMETER="-q"
TARPARAMETER=""

# functions
function usage {
	exec 1>&2
	echo "Usage: ${SCRIPTNAME} [-h] [-v] [-p patchfile] [-m path/to/medium]"
	echo "Parameters:"
	echo "	-p	Path to file containing Solaris Patch-IDs (1 per line)"
	echo "		Defaults to '${PATCHFILE}'"
	echo "	-m	Path to medium"
	echo "		Defaults to '${MEDIUM}'"
	echo "	-v	verbose mode"
	echo "	-h	Help"
	[[ ${#} -eq 1 ]] && exit ${1} || exit ${EXIT_FAILURE}
}

while getopts 'p:m:vh' OPTION ; do
	case ${OPTION} in
		v)	VERBOSE=y
			unset UNZIPPARAMETER
			TARPARAMETER="v"
			;;
		m)	MEDIUM="${OPTARG}"
			;;
		p)	PATCHFILE="${OPTARG}"
			;;
		h)	usage ${EXIT_SUCCESS}
			;;
		\?)	echo "unknown option \"-${OPTARG}\"." >&2
			usage ${EXIT_ERROR}
			;;
		:)	echo "option \"-${OPTARG}\" requires an argument." >&2
			usage ${EXIT_ERROR}
			;;
		*)	echo "Impossible error. parameter: ${OPTION}" >&2
			usage ${EXIT_BUG}
			;;
	esac
done


# skip parsed options
shift $(( OPTIND - 1 ))

if (( $# > 0 )) ; then
	echo "Unknown arguments $*" >&2
	usage ${EXIT_ERROR}
fi

if ! who -r | grep "run-level 1" >/dev/null ; then
	echo "YOU ARE NOT IN SINGLE USER MODE!"
	echo "Please press ^C to stop patch installation"
	echo "or wait 30 seconds to start anyway."
	for x in 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 ; do
		echo -e "${x} \r"
	done
	echo
fi

mkdir -p /tmp/patches
cd /tmp/patches

for patch in $( cat ${PATCHFILE} ); do
	patchlevel="${patch##*-}"
	patchfile="`find ${MEDIUM} -name "${patch}*" -type f`"

	if [ -z "${patchfile}" ] ; then
		patchfile="`find ${MEDIUM} -name "${patch%-*}*" -type f`"
	fi

	if [ -z "${patchfile}" ] ; then
		echo "Could not find patch ${patch}" >&2
		continue
	else
		cp "${patchfile}" /tmp/patches
	fi

	foundpatchlevel="${patchfile##*-}"
	foundpatchlevel="${foundpatchlevel%%.*}"

	if [ ${foundpatchlevel} -lt ${patchlevel} ] ; then
		echo "${patchfile##*/} patchlevel is too old (${patchlevel} expected!)" >&2
		continue
	fi

	patchfile="/tmp/patches/${patchfile##*/}"
	[ "${patchfile: -4}" == ".zip" ] && unzip ${UNZIPPARAMETER} "${patchfile}"
	[ "${patchfile: -6}" == ".tar.Z" ] && uncompress "${patchfile}" && tar x${TARPARAMETER}f "${patchfile%.Z}"
	[ "${patchfile: -7}" == ".tar.gz" ] && gzcat "${patchfile}" | tar x${TARPARAMETER}f -
	patchadd ${patchfile%%.*}
	retval=$?
	[ ${retval} -ne 0 ] && echo "${patch} exited with exit-status: ${retval}" >&2
done