ever17 psp patcher

#!/bin/bash
#######################################################################
#
#  linux patcher for ever17
#  tested on xubuntu and alpine linux
#  license for this script: http://www.wtfpl.net/
#
#######################################################################

# abort if something goes bad
set -e

# fancy status messages
function out() { printf "    $@\n"; }
function msg() { printf   "\033[0;33m[*]\033[0m $@\n" "$@"; }
function inf() { printf "\n\033[1;32m[+]\033[0m $@\n" "$@"; }
function err() { printf "\n\033[1;31m[-]\033[0m $@\n" "$@"; }
function ask() { printf "\n\033[1;37m[>]\033[0m "; read -u1 -r; echo; }

# say hi
inf "Ever17 PSP English Patch Beta 2  (linux patcher v1)"


msg "checking that all dependencies are installed"
function have()
{
    which "$1" >/dev/null 2>/dev/null ||
    {
        err "the program '$1' is not installed"
        out "please install $2"
        echo
        exit 1
    }
}
have mkisofs "'cdrtools' or 'cdrkit'"
have isoinfo "'cdrtools' or 'cdrkit'"
have xdelta3 it


msg "checking that your xdelta3 works"
function xdelta3unusable()
{
    strings "$(which xdelta3)" |
    grep LZMA |
    grep -iq unavailable
}

xdelta3unusable &&
{
    err "your xdelta3 is probably unusable:"
    out "the translation patch uses LZMA compression,"
    out "your xdelta3 seems to have LZMA disabled."
    inf "that said, this MIGHT work after all... wanna try?"
    echo
    out "CTRL-C  to abort"
    out "ENTER   to continue"
    ask
}


msg "checking that your mkisofs works"
strings "$(which mkisofs)" | grep -qE 'xorriso %d.%d' &&
{
    err "wrong version of mkisofs"
    echo
    out "you have xorriso installed,"
    out "this conflicts with the real mkisofs from cdrkit."
    out "please temporarily uninstall xorriso/libburn"
    out "(usually pulled in by alpine-sdk)"
    out "then reinstall cdrkit"
    echo
    exit 1
}


# need to make sure we are in the correct directory
# (same directory as this script is in)
self="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
oldpwd="$(pwd)"
cd "$self"
newpwd="$(pwd)"
[[ "x$oldpwd" == "x$newpwd" ]] ||
    msg "changing directory to $newpwd"


msg "checking that you have enough disk space"
free=$(
    df -PBM . | tail -n 1 |
    awk '{sub(/M$/, "", $4); print $4}' ||
    echo 99999999
)
needed=3206
needed=$((needed+128))
[[ $free -lt $needed ]] &&
{
    err "not enough disk space"
    err "in the folder where this script is located:"
    out "you have $free MB free"
    out " we need $needed MB free"
    echo
    msg "move the patch folder and try again"
    exit 1
}


# read the iso filename
arg="$1"
[[ "x$arg" == "x" ]] &&
{
    err 'need mandatory argument 1:'
    out 'path to the ever17 iso file'
    echo
    out "example:  $0  ~/games/ever17.iso"
    echo
    exit 1
}


msg "checking that the iso exists"
iso="$arg"

[[ -s "$iso" ]] ||
    # maybe it was a relative path
    iso="$oldpwd/$arg"

[[ -s "$iso" ]] ||
{
    err 'could not read the iso file:'
    out "$arg"
    echo
    exit 1
}


# all tests ok
inf "unpacking iso"
rm -rf ISO 2>/dev/null || true

# get a list of all the files in the iso
isoinfo -i "$iso" -f |

# normalize the output, just in case some
# versions of isoinfo should appear different
sed -r 's@^/@@;s@^@ISO/@' |
while read path
do
    dir="${path%/*}"
    file="${path##*/}"

    # don't care about directories
    [[ "$file" =~ \. ]] ||
        continue

    msg "extracting  $dir/$file"
    mkdir -p "$dir"

    # remove ISO from the start of the string
    isoinfo -i "$iso" -x "${path:3}" > "$path"

    [[ -s "$path" ]] ||
        # this version of isoinfo expects no leading slash
        isoinfo -i "$iso" -x "${path:4}" > "$path"

    [[ -s "$path" ]] ||
    {
        err "failed to extract file from iso:"
        out "$path"
        echo
        exit 1
    }
done



inf "patching files using xdelta3"

mv ISO/PSP_GAME/USRDIR/mac.afs ISO/PSP_GAME/USRDIR/mac.old
mv ISO/PSP_GAME/USRDIR/init.bin ISO/PSP_GAME/USRDIR/init.old

msg "patching  USRDIR/mac.afs"
xdelta3 -d -s \
    ISO/PSP_GAME/USRDIR/mac.old \
    patch/mac.delta \
    ISO/PSP_GAME/USRDIR/mac.afs ||
{
    err "failed to patch file"
    xdelta3unusable &&
        out "you definitely need a better version of xdelta3 :(" ||
        out "and i have no idea why... :("
    echo
    exit 1
}

msg "patching  USRDIR/init.afs"
xdelta3 -d -s \
    ISO/PSP_GAME/USRDIR/init.old \
    patch/init.delta \
    ISO/PSP_GAME/USRDIR/init.bin

msg "cleanup"
rm ISO/PSP_GAME/USRDIR/mac.old
rm ISO/PSP_GAME/USRDIR/init.old

msg "copying   SYSDIR/EBOOT.BIN"
cp patch/EBOOT.BIN ISO/PSP_GAME/SYSDIR/EBOOT.BIN



inf "creating new iso"
outfile="ever17EN_Beta2.iso"
rm "$outfile" 2>/dev/null || true

mkisofs -sort patch/filelist.txt \
    -iso-level 4 -xa -A "PSP GAME" -V "Ever17" \
    -sysid "PSP GAME" -volset "Ever17" \
    -p "" -publisher "" -o "$outfile" ISO/ 2>&1 |

# make mkisofs output less verbose
# by keeping all the progress stuff on one line
sed -r "s/(.*% done.*)/$(printf '\033[A\\1\033[K')/"

#inf "done!  disk space used: $(du -sBM)"
inf "done!"
msg "this is your new iso:"
out "$outfile"
echo

rm -rf ISO