pdkl95/mcjar-aether.bash

## mcjar-aether.bash
#!/bin/bash

## This script is Copyright Brent Sanders 2012, and is released
## for general use under the GPLv3
##
## INSTRUCTIONS:
##   Put this script and all the downloaded .zip files for the various
##   mods in a folder. 'cd' over to that folder. Run this script.
##
##   e.g.
##      mkdir mod && cd mod
##      # copy files (modify as needed)
##      cp ~/Downloads/*.zip .
##      # copy this script to that directory
##      cp ~/Downloads/mcjar-aether.bash .
##      # make the script executable
##      chmod +x mcjar-aether.bash
##      # run it
##      ./mcjar-aether.bash

###################
# Install Options #
###################

### Minecraft Dir - defaults to .minecraft in your
###                 in yuur home directory.
: ${MINECRAFT:=${HOME}/.minecraft}
#MINECRAFT=/some/other/path

### minecraf.jar - As an alternative to the abovve,
###                you can speciy where to find the
###                actual minecraft.jar to modify.
###                That's the only reason the minecraft
###                directory anyway. This defaults to
###                relying on the probably-easier-to-guess
###                previous version, so it starts with
###                the default of: ${MINECRAFT}/bin/minecraft.jar
: ${MINECRAFT_JAR:=${MINECRAFT}/bin/minecraft.jar}
#MINECRAFT_JAR=/some/other/path/bin/minecraft.jar
echo ${MINECRAFT_JAR}
### Modfile Dir -- The directory where we can find
###                the downloadever ZIPS for the mods(s)
###                I will look in the *CURRENT* dir if
###                you do not specify anything. So it's
###                important to either export MODFILES
###                to your storage area for the .zips,
###                or to copy the zips *yourself* to
###                to the same directotory your'se in
###                *launching* this script from.
###  (( TL;DR? ))
###    Don't edit this file, mods and this file to the
###    same place, run this scrip, hope, and  the magic works.
###
: ${MODFILES:=$PWD}
#MODFILES="${HOME}/Downloads"

### SaveJars Dir -- Keep a copy of al minecraft.jar versions here
###                 They are all tagged with the mod names that
###                 made it in, so you can easily restart at any
###                 point for testing.
###
: ${SAVEJARS:=$PWD}
#SAVEJARS="${HOME}/games/minecraft/mod_backups

### md5sum Utility - This is present on most systems, and should be
###                  found automatically, but if not, enter the
###                  full path here to to the program. While we can
###                  *techcically* proceed without it, you would be
###                  most reliable method of verifying that the mod
###                  files you are using are _correct_ and undamaged.
: ${MD5SUM:=$(which md5sum)}
#MD5SUM=/opt/fancywidgits/with/strange_location/bin/md5sum


###############
# MOD OPTIONS #
###############

# as measured myself, and matches the last line
# in the bin/md5s that came with 1.0.0
MC_JAR_VERSION="1.0.0"
MC_JAR_MD5=3820d222b95d0b8c520d9596a756a6e6
MC_JAR_SIZE=2362837
MC_JAR_FILECOUNT=1127
# filecount *excludes* the META-INF folder which has
# likely already been removed?
#
# other ways to verify the version?


# the mod MD5s for the versions known to work
# along with a the other necessary metadata about
# the mod.
MOD_0_NAME="ModLoader"
MOD_0_URL="http://www.minecraftforum.net/topic/75440-v11-risugamis-mods-everything-updated/"
MOD_0_MD5="2515532b80cee9890be2c7f89c7d8992"
MOD_0_FILE="ModLoader 1.0.0.zip"
MOD_0_SIZE=88347

MOD_1_NAME="ModLoaderMP"
MOD_1_URL="http://www.minecraftforum.net/topic/182918-100smp-flans-mods-planes-ww2-guns-vehicles-playerapi-moods-mputils-teams/#MLM"
MOD_1_MD5="b59a3bae02a2b00a8dadd010e2e5e898"
MOD_1_FILE="ModLoaderMp 1.0.0.zip"
MOD_1_SIZE=24636

MOD_2_NAME="AudioMod"
MOD_2_URL="http://www.minecraftforum.net/topic/75440-v11-risugamis-mods-everything-updated/"
MOD_2_MD5="5cbc7931a6b23876054bfe5cb7eaa993"
MOD_2_FILE="AudioMod 1.0.0.zip"
MOD_2_SIZE=46901

MOD_3_NAME="PlayerAPI"
MOD_3_URL="http://www.minecraftforum.net/topic/738498-100api-player-api/"
MOD_3_MD5="37644b273328ec98440efd685f066671"
MOD_3_FILE="MC 1.0.0 - Player API client 1.6.zip"
MOD_3_SIZE=73898

MOD_4_NAME="ShockAhPI"
MOD_4_URL="http://adf.ly/373209/sapi-r11"
MOD_4_MD5="fb6817b3161da1df2f11165ac31a6ccf"
MOD_4_FILE="SAPI r11.zip"
MOD_4_SIZE=113976
MOD_4_JARFILES="bin"

MOD_5_NAME="Aether"
MOD_5_URL="http://www.minecraftforum.net/topic/893629-100-aether-v104-01-launch-bug-fixed-bug-fixes-crystal-trees-enchanted-grass-white-apples/"
MOD_5_MD5="3166e5e1ac762126129964bc5f791503"
MOD_5_FILE="Aether_1.04_1_Final.zip"
MOD_5_SIZE="28575877"
MOD_5_JARFILES="Aether_1.04_1_Final/Jar"


# <rant>Ahhhh please, no *SPACES* in filenames! It makes a HUGE
# chore to constantly have to wrap everything in "quote sections"
# like you see throughout this file... dash (-) or underscore (_)
# make perfectly good replacements!</rant>

######################################
# END OF MOD-SPECIFIC  CONFIGURATION #m
######################################

count_mods() {
    local c=0
    while true ; do
        local mod_name="MOD_${c}_NAME"
        [[ -n "${!mod_name}" ]] || return $c
        ((c++))
    done
}
count_mods
MOD_COUNT="$?"
echo "*** FOUND ${MOD_COUNT} LISTED MODS"
echo
(( MOD_COUNT > 0 )) || die "Nothing to do!"

MCJAR_DIR=$(dirname "${MINECRAFT_JAR}")
MCJAR_BASE=$(basename "${MINECRAFT_JAR}")
MCJAR_BASE_NOEXT="${MCJAR_BASE%.*}"


echo "*** SETTINGS:"

echo "    Using MineCraft in: ${MINECRAFT}"
echo "     .jar to be modded: ${MINECRAFT_JAR}"
echo "    Search for MODs in: ${MODFILES}"
echo "       saving .jars in: ${SAVEJARS}"
echo "    md5sumn: ${MD5SUM}"
echo
echo "*** CHECKING ENVIRONMENT:"

die() {
    echo
    echo "*** FATAL ERROR!"
    echo "*** Mod install aborted"
    if (($# > 0)) ; then
        echo "*** $@"
    fi
    exit -1
}

# validate basic - yet highly prone to error - setting
[[ -d "${MINECRAFT}"     ]] || die "Minecaft not found at: ${MINECRAFT}"
[[ -w "${MINECRAFT}"     ]] || dir "Minecaft in directory found, but we cannot write to it."
[[ -e "${MINECRAFT_JAR}" ]] || die "Could not find minecraft.jar at ${MINECRAFT_JAR}"
[[ -w "${MINECRAFT_JAR}" ]] || die "Cannot write to ${MINECRAFT_JAR}"
[[ -e "${MODFILES}"      ]] || die "Cannot read ${MODFILES} for mod files, as it does not exist!"
[[ -d "${MODFILES}"      ]] || die "Expected a DIRECTORY to search at: ${MODFILES}"
[[ -d "${SAVEJARS}"      ]] || die "Jar backup area doesn't exist: ${SAVEJARS}"
[[ -d "${SAVEJARS}"      ]] || die "Can only backup jars to a directory."

echo "    Congradulations, the enviornment looks sane and usable!"
echo
echo "*** CHECKING REQUIREMENTS:"

# EMPTY now, but used to access the mod_N_foo variables later
mod_name=
mod_url=
mod_md5=
mod_file=
mod_size=

check_size() {
    local size="$1" path="$2"
    if [[ -n "${!mod_size}" ]] ; then
        declare -r -i testsize="$(stat --format="%s" "$path")"
        if (( size == testsize )) ; then
            echo "       PASS: FileSize (${!mod_size} bytes)"
            return 0
        else
            echo "       FAIL: Filesize - !!! INCORRECT FILE SIZE !!!"
            echo "           CORRECT SIZE: $size bytes"
            echo "            ACTUAL SIZE: $testsize bytes"
            return 1
        fi
    else
        echo "       SKIP: FileSize - missing reverence value"
        return 0
    fi
}


if [[ -n "$MD5SUM" ]] ; then
    check_md5() {
        local md5="$1" path="$2"
        if [[ -z "${md5}" ]] ; then
            echo "       SKIP: MD5check - no reference value"
            return 0
        else
            local testmd5="$(${MD5SUM} "${path}")"
            md5="${md5:0:32}"
            testmd5="${testmd5:0:32}"
            if [[ "$md5" == "$test_md5" ]] ; then
                echo "       FAIL: MD5check - !!! CHECKSUM FAILURE !!!"
                echo "             Incorrect or damaged file?"
                echo "          FAILED FILE: ${path}"
                echo "         EXCPETED MD5: ${md5}"
                echo "           ACTUAL MD5: ${testmd5}"
                return 1
            else
                echo "       PASS: MD5check (${md5})"
                return 0
            fi
        fi
    }
else
    check_md5() {
        "  --> ********  WARNING  ******** <--"
        "  --> Cannot find utility: md5sum <--"
        "  --> SKIPPPING integriety check! <--"
        "  --> ********  WARNING  ******** <--"
    }
fi


# Check the mods a re sanely listed and that
# we have the required files
check_mod_ready() {
    local path="$1" size="$2" hash="$3#3"

    [[ -e "$path" ]] || die "File is Missing. Is it downloaded and in our search?"
    [[ -r "$path" ]] || die "Exists, but could not be read. (permissions?)"

    if ! check_size "${!mod_size}" "$path" ; then return 1; fi
    if ! check_md5  "${!mod_md5}"  "$path" ; then return 1; fi

    return 0
}

verify_initial_jar() {
    local path="$1"

    if ! check_size "${MC_JAR_SIZE}" "$path" ; then return 1; fi
    if ! check_md5  "${MC_JAR_MD5}"  "$path" ; then return 1; fi

    return 0
}

for i in 0 1 2 3 4 5; do
    mod_name="MOD_${i}_NAME"
    mod_md5="MOD_${i}_MD5"
    mod_url="MOD_${i}_URL"
    mod_file="MOD_${i}_FILE"
    mod_size="MOD_${i}_SIZE"

    # FIXME - should auto-sense the number of mods with a while loop
    echo
    echo "   >> VERIFYING: ${PWD}/${!mod_file}"
    if check_mod_ready "${PWD}/${!mod_file}" "${!mod_size}" "${!mod_md5}" ; then
        echo "   >> ${!mod_name} Verified Successfully!"
    else
        die "Could not verify: ${!mod_name}"
    fi
done

echo "   >> VERIFYING: ${MINECRAFT_JAR}"
if verify_initial_jar "${MINECRAFT_JAR}" ; then
    echo "   >> minecraft.jar version ${MC_JAR_VERSION} is clean and ready for modding!"
else
    die "Problem with minecraft.jar!"
fi

echo
echo "    All required files are accounted for and verified!"
echo
echo "*** APPLYING THE MODS:"


chain="${MC_JAR_VERSION}"
declare -a jarmods

apply_mod() {
    local jar="$1" modfile="$2" jarfiles="$3"
    echo "   - Applying: ${modfile}"

    if [[ -n "${jar}" ]] ; then
        jarfiles="${jarfiles}/"
    fi

    # do our work in a temporary folder
    TMPDIR="$(mktemp --directory modtmp-minecraft.jar-XXXXXX)"
    cleanup() {
        popd > /dev/null
        rm -rf "${TMPDIR}"
    }
    # and trap RETURN so we automagically clean up
    # after ourself. Leaving temp files around is messy.
    trap cleanup RETURN
    pushd "${TMPDIR}" > /dev/null

    mkdir -p jar mod

    cd ./mod/
    unzip "$modfile" > /dev/null
    cd ..

    cd ./jar/
    jar xf "${MINECRAFT_JAR}"
    rm -f META-INF/MOJANG_C.*
    cp -r "../mod/${jarfiles}"* .
    jar cf "${MINECRAFT_JAR}" *
    cd ..

    return 0
}

for i in 0 1 2 3 4 5; do
    mod_name="MOD_${i}_NAME"
    mod_md5="MOD_${i}_MD5"
    mod_url="MOD_${i}_URL"
    mod_file="MOD_${i}_FILE"
    mod_size="MOD_${i}_SIZE"
    mod_jarfiles="MOD_${i}_JARFILES"

    apply_mod "${MINECRAFT_JAR}" "${MODFILES}/${!mod_file}" "${!mod_jarfiles}"
    chain="$chain-${!mod_name}"
    backup="${MCJAR_BASE_NOEXT}-${chain}.jar"
    #echo "Backup up intermediate jarfile as:"
    #echo "  >> $backup"
    jarmods[$i]="$backup"
    cp "${MINECRAFT_JAR}" "${SAVEJARS}/${backup}"
done

echo
echo "*** SUCCESS!"
echo
echo "There should be ${MOD_COUNT} mods installed now, ready"
echo "for however you usually launch minecraft."
if [[ -n "${SAVEJARS}" ]] && (( MOD_COUNT > 1 )) ; then
    echo
    echo "Remember: there are intermediate backups available!"
    echo "If there is a problem starting minecraft even with"
    echo "this script, it may be necessary to go on a more extensive"
    echo "bug hunting investigation. A good place to start, though,"
    echo "woudl probably be by testing these jars. That way, you"
    echo "should be able to narrow it down to *which* mod is the"
    echo "one breaking your Minecraft."
    jarcount=${MOD_COUNT}
    echo
    echo "    >>> CURENTLY minecraft.jar (backup .jar)"
    ((jarcount--))
    echo "        ${jarmods[jarcount]}"
    echo
    echo "    >>> AVAILABLE jars with fewer mods"
    while (( jarcount > 0 )) ; do
        ((jarcount--))
        echo "        ${jarmods[$jarcount]}"
    done
fi
echo


echo "*** END OF SCRIPT"
exit 0
	#!/bin/bash

	## This script is Copyright Brent Sanders 2012, and is released
	## for general use under the GPLv3
	##
	## INSTRUCTIONS:
	## Put this script and all the downloaded .zip files for the various
	## mods in a folder. 'cd' over to that folder. Run this script.
	##
	## e.g.
	## mkdir mod && cd mod
	## # copy files (modify as needed)
	## cp ~/Downloads/*.zip .
	## # copy this script to that directory
	## cp ~/Downloads/mcjar-aether.bash .
	## # make the script executable
	## chmod +x mcjar-aether.bash
	## # run it
	## ./mcjar-aether.bash

	###################
	# Install Options #
	###################

	### Minecraft Dir - defaults to .minecraft in your
	### in yuur home directory.
	: ${MINECRAFT:=${HOME}/.minecraft}
	#MINECRAFT=/some/other/path

	### minecraf.jar - As an alternative to the abovve,
	### you can speciy where to find the
	### actual minecraft.jar to modify.
	### That's the only reason the minecraft
	### directory anyway. This defaults to
	### relying on the probably-easier-to-guess
	### previous version, so it starts with
	### the default of: ${MINECRAFT}/bin/minecraft.jar
	: ${MINECRAFT_JAR:=${MINECRAFT}/bin/minecraft.jar}
	#MINECRAFT_JAR=/some/other/path/bin/minecraft.jar
	echo ${MINECRAFT_JAR}
	### Modfile Dir -- The directory where we can find
	### the downloadever ZIPS for the mods(s)
	### I will look in the CURRENT dir if
	### you do not specify anything. So it's
	### important to either export MODFILES
	### to your storage area for the .zips,
	### or to copy the zips yourself to
	### to the same directotory your'se in
	### launching this script from.
	### (( TL;DR? ))
	### Don't edit this file, mods and this file to the
	### same place, run this scrip, hope, and the magic works.
	###
	: ${MODFILES:=$PWD}
	#MODFILES="${HOME}/Downloads"

	### SaveJars Dir -- Keep a copy of al minecraft.jar versions here
	### They are all tagged with the mod names that
	### made it in, so you can easily restart at any
	### point for testing.
	###
	: ${SAVEJARS:=$PWD}
	#SAVEJARS="${HOME}/games/minecraft/mod_backups

	### md5sum Utility - This is present on most systems, and should be
	### found automatically, but if not, enter the
	### full path here to to the program. While we can
	### techcically proceed without it, you would be
	### most reliable method of verifying that the mod
	### files you are using are _correct_ and undamaged.
	: ${MD5SUM:=$(which md5sum)}
	#MD5SUM=/opt/fancywidgits/with/strange_location/bin/md5sum


	###############
	# MOD OPTIONS #
	###############

	# as measured myself, and matches the last line
	# in the bin/md5s that came with 1.0.0
	MC_JAR_VERSION="1.0.0"
	MC_JAR_MD5=3820d222b95d0b8c520d9596a756a6e6
	MC_JAR_SIZE=2362837
	MC_JAR_FILECOUNT=1127
	# filecount excludes the META-INF folder which has
	# likely already been removed?
	#
	# other ways to verify the version?


	# the mod MD5s for the versions known to work
	# along with a the other necessary metadata about
	# the mod.
	MOD_0_NAME="ModLoader"
	MOD_0_URL="http://www.minecraftforum.net/topic/75440-v11-risugamis-mods-everything-updated/"
	MOD_0_MD5="2515532b80cee9890be2c7f89c7d8992"
	MOD_0_FILE="ModLoader 1.0.0.zip"
	MOD_0_SIZE=88347

	MOD_1_NAME="ModLoaderMP"
	MOD_1_URL="http://www.minecraftforum.net/topic/182918-100smp-flans-mods-planes-ww2-guns-vehicles-playerapi-moods-mputils-teams/#MLM"
	MOD_1_MD5="b59a3bae02a2b00a8dadd010e2e5e898"
	MOD_1_FILE="ModLoaderMp 1.0.0.zip"
	MOD_1_SIZE=24636

	MOD_2_NAME="AudioMod"
	MOD_2_URL="http://www.minecraftforum.net/topic/75440-v11-risugamis-mods-everything-updated/"
	MOD_2_MD5="5cbc7931a6b23876054bfe5cb7eaa993"
	MOD_2_FILE="AudioMod 1.0.0.zip"
	MOD_2_SIZE=46901

	MOD_3_NAME="PlayerAPI"
	MOD_3_URL="http://www.minecraftforum.net/topic/738498-100api-player-api/"
	MOD_3_MD5="37644b273328ec98440efd685f066671"
	MOD_3_FILE="MC 1.0.0 - Player API client 1.6.zip"
	MOD_3_SIZE=73898

	MOD_4_NAME="ShockAhPI"
	MOD_4_URL="http://adf.ly/373209/sapi-r11"
	MOD_4_MD5="fb6817b3161da1df2f11165ac31a6ccf"
	MOD_4_FILE="SAPI r11.zip"
	MOD_4_SIZE=113976
	MOD_4_JARFILES="bin"

	MOD_5_NAME="Aether"
	MOD_5_URL="http://www.minecraftforum.net/topic/893629-100-aether-v104-01-launch-bug-fixed-bug-fixes-crystal-trees-enchanted-grass-white-apples/"
	MOD_5_MD5="3166e5e1ac762126129964bc5f791503"
	MOD_5_FILE="Aether_1.04_1_Final.zip"
	MOD_5_SIZE="28575877"
	MOD_5_JARFILES="Aether_1.04_1_Final/Jar"


	# <rant>Ahhhh please, no SPACES in filenames! It makes a HUGE
	# chore to constantly have to wrap everything in "quote sections"
	# like you see throughout this file... dash (-) or underscore (_)
	# make perfectly good replacements!</rant>

	######################################
	# END OF MOD-SPECIFIC CONFIGURATION #m
	######################################

	count_mods() {
	local c=0
	while true ; do
	local mod_name="MOD_${c}_NAME"
	[[ -n "${!mod_name}" ]] \|\| return $c
	((c++))
	done
	}
	count_mods
	MOD_COUNT="$?"
	echo "*** FOUND ${MOD_COUNT} LISTED MODS"
	echo
	(( MOD_COUNT > 0 )) \|\| die "Nothing to do!"

	MCJAR_DIR=$(dirname "${MINECRAFT_JAR}")
	MCJAR_BASE=$(basename "${MINECRAFT_JAR}")
	MCJAR_BASE_NOEXT="${MCJAR_BASE%.*}"


	echo "*** SETTINGS:"

	echo " Using MineCraft in: ${MINECRAFT}"
	echo " .jar to be modded: ${MINECRAFT_JAR}"
	echo " Search for MODs in: ${MODFILES}"
	echo " saving .jars in: ${SAVEJARS}"
	echo " md5sumn: ${MD5SUM}"
	echo
	echo "*** CHECKING ENVIRONMENT:"

	die() {
	echo
	echo "*** FATAL ERROR!"
	echo "*** Mod install aborted"
	if (($# > 0)) ; then
	echo "*** $@"
	fi
	exit -1
	}

	# validate basic - yet highly prone to error - setting
	[[ -d "${MINECRAFT}" ]] \|\| die "Minecaft not found at: ${MINECRAFT}"
	[[ -w "${MINECRAFT}" ]] \|\| dir "Minecaft in directory found, but we cannot write to it."
	[[ -e "${MINECRAFT_JAR}" ]] \|\| die "Could not find minecraft.jar at ${MINECRAFT_JAR}"
	[[ -w "${MINECRAFT_JAR}" ]] \|\| die "Cannot write to ${MINECRAFT_JAR}"
	[[ -e "${MODFILES}" ]] \|\| die "Cannot read ${MODFILES} for mod files, as it does not exist!"
	[[ -d "${MODFILES}" ]] \|\| die "Expected a DIRECTORY to search at: ${MODFILES}"
	[[ -d "${SAVEJARS}" ]] \|\| die "Jar backup area doesn't exist: ${SAVEJARS}"
	[[ -d "${SAVEJARS}" ]] \|\| die "Can only backup jars to a directory."

	echo " Congradulations, the enviornment looks sane and usable!"
	echo
	echo "*** CHECKING REQUIREMENTS:"

	# EMPTY now, but used to access the mod_N_foo variables later
	mod_name=
	mod_url=
	mod_md5=
	mod_file=
	mod_size=

	check_size() {
	local size="$1" path="$2"
	if [[ -n "${!mod_size}" ]] ; then
	declare -r -i testsize="$(stat --format="%s" "$path")"
	if (( size == testsize )) ; then
	echo " PASS: FileSize (${!mod_size} bytes)"
	return 0
	else
	echo " FAIL: Filesize - !!! INCORRECT FILE SIZE !!!"
	echo " CORRECT SIZE: $size bytes"
	echo " ACTUAL SIZE: $testsize bytes"
	return 1
	fi
	else
	echo " SKIP: FileSize - missing reverence value"
	return 0
	fi
	}


	if [[ -n "$MD5SUM" ]] ; then
	check_md5() {
	local md5="$1" path="$2"
	if [[ -z "${md5}" ]] ; then
	echo " SKIP: MD5check - no reference value"
	return 0
	else
	local testmd5="$(${MD5SUM} "${path}")"
	md5="${md5:0:32}"
	testmd5="${testmd5:0:32}"
	if [[ "$md5" == "$test_md5" ]] ; then
	echo " FAIL: MD5check - !!! CHECKSUM FAILURE !!!"
	echo " Incorrect or damaged file?"
	echo " FAILED FILE: ${path}"
	echo " EXCPETED MD5: ${md5}"
	echo " ACTUAL MD5: ${testmd5}"
	return 1
	else
	echo " PASS: MD5check (${md5})"
	return 0
	fi
	fi
	}
	else
	check_md5() {
	" --> ****** WARNING ****** <--"
	" --> Cannot find utility: md5sum <--"
	" --> SKIPPPING integriety check! <--"
	" --> ****** WARNING ****** <--"
	}
	fi


	# Check the mods a re sanely listed and that
	# we have the required files
	check_mod_ready() {
	local path="$1" size="$2" hash="$3#3"

	[[ -e "$path" ]] \|\| die "File is Missing. Is it downloaded and in our search?"
	[[ -r "$path" ]] \|\| die "Exists, but could not be read. (permissions?)"

	if ! check_size "${!mod_size}" "$path" ; then return 1; fi
	if ! check_md5 "${!mod_md5}" "$path" ; then return 1; fi

	return 0
	}

	verify_initial_jar() {
	local path="$1"

	if ! check_size "${MC_JAR_SIZE}" "$path" ; then return 1; fi
	if ! check_md5 "${MC_JAR_MD5}" "$path" ; then return 1; fi

	return 0
	}

	for i in 0 1 2 3 4 5; do
	mod_name="MOD_${i}_NAME"
	mod_md5="MOD_${i}_MD5"
	mod_url="MOD_${i}_URL"
	mod_file="MOD_${i}_FILE"
	mod_size="MOD_${i}_SIZE"

	# FIXME - should auto-sense the number of mods with a while loop
	echo
	echo " >> VERIFYING: ${PWD}/${!mod_file}"
	if check_mod_ready "${PWD}/${!mod_file}" "${!mod_size}" "${!mod_md5}" ; then
	echo " >> ${!mod_name} Verified Successfully!"
	else
	die "Could not verify: ${!mod_name}"
	fi
	done

	echo " >> VERIFYING: ${MINECRAFT_JAR}"
	if verify_initial_jar "${MINECRAFT_JAR}" ; then
	echo " >> minecraft.jar version ${MC_JAR_VERSION} is clean and ready for modding!"
	else
	die "Problem with minecraft.jar!"
	fi

	echo
	echo " All required files are accounted for and verified!"
	echo
	echo "*** APPLYING THE MODS:"


	chain="${MC_JAR_VERSION}"
	declare -a jarmods

	apply_mod() {
	local jar="$1" modfile="$2" jarfiles="$3"
	echo " - Applying: ${modfile}"

	if [[ -n "${jar}" ]] ; then
	jarfiles="${jarfiles}/"
	fi

	# do our work in a temporary folder
	TMPDIR="$(mktemp --directory modtmp-minecraft.jar-XXXXXX)"
	cleanup() {
	popd > /dev/null
	rm -rf "${TMPDIR}"
	}
	# and trap RETURN so we automagically clean up
	# after ourself. Leaving temp files around is messy.
	trap cleanup RETURN
	pushd "${TMPDIR}" > /dev/null

	mkdir -p jar mod

	cd ./mod/
	unzip "$modfile" > /dev/null
	cd ..

	cd ./jar/
	jar xf "${MINECRAFT_JAR}"
	rm -f META-INF/MOJANG_C.*
	cp -r "../mod/${jarfiles}"* .
	jar cf "${MINECRAFT_JAR}" *
	cd ..

	return 0
	}

	for i in 0 1 2 3 4 5; do
	mod_name="MOD_${i}_NAME"
	mod_md5="MOD_${i}_MD5"
	mod_url="MOD_${i}_URL"
	mod_file="MOD_${i}_FILE"
	mod_size="MOD_${i}_SIZE"
	mod_jarfiles="MOD_${i}_JARFILES"

	apply_mod "${MINECRAFT_JAR}" "${MODFILES}/${!mod_file}" "${!mod_jarfiles}"
	chain="$chain-${!mod_name}"
	backup="${MCJAR_BASE_NOEXT}-${chain}.jar"
	#echo "Backup up intermediate jarfile as:"
	#echo " >> $backup"
	jarmods[$i]="$backup"
	cp "${MINECRAFT_JAR}" "${SAVEJARS}/${backup}"
	done

	echo
	echo "*** SUCCESS!"
	echo
	echo "There should be ${MOD_COUNT} mods installed now, ready"
	echo "for however you usually launch minecraft."
	if [[ -n "${SAVEJARS}" ]] && (( MOD_COUNT > 1 )) ; then
	echo
	echo "Remember: there are intermediate backups available!"
	echo "If there is a problem starting minecraft even with"
	echo "this script, it may be necessary to go on a more extensive"
	echo "bug hunting investigation. A good place to start, though,"
	echo "woudl probably be by testing these jars. That way, you"
	echo "should be able to narrow it down to which mod is the"
	echo "one breaking your Minecraft."
	jarcount=${MOD_COUNT}
	echo
	echo " >>> CURENTLY minecraft.jar (backup .jar)"
	((jarcount--))
	echo " ${jarmods[jarcount]}"
	echo
	echo " >>> AVAILABLE jars with fewer mods"
	while (( jarcount > 0 )) ; do
	((jarcount--))
	echo " ${jarmods[$jarcount]}"
	done
	fi
	echo


	echo "*** END OF SCRIPT"
	exit 0