WoP Linux Installer

#!/bin/sh

# Fail on the first failure
set -e

#
# Simple text installer based on makeself and the Windows installer for WoP.
# Use this if you don't want to verify a 400 line shell script or use a binary
# installer.
#
# -- undead
#

# These two are specific to WoP
MAKESELF="worldofpadman.run"
FILESIZES="576943498"
INSTALLDIR="WoP"

# The rest of these are extracted from Makeself.
# Note: This is not makeself's version.  I chdir with tar.
UnTAR()
{
    tar -C $1 -$2vf - 2>&1 || { echo Extraction failed. > /dev/tty; kill -15 $$; }
}

MS_dd()
{
    blocks=`expr $3 / 1024`
    bytes=`expr $3 % 1024`
    dd if="$1" ibs=$2 skip=1 obs=1024 conv=sync 2> /dev/null | \
    { test $blocks -gt 0 && dd ibs=1024 obs=1024 count=$blocks ; \
      test $bytes  -gt 0 && dd ibs=1 obs=1024 count=$bytes ; } 2> /dev/null
}

MS_untar_file()
{
    mkdir -p "$INSTALLDIR";

    offset=`head -n 401 "$MAKESELF" | wc -c | tr -d " "`
    for s in $FILESIZES; do
        MS_dd "$MAKESELF" $offset $s | eval "gzip -cd" | UnTAR $INSTALLDIR x
        offset=`expr $offset + $s`
    done
}

WoP_install()
{
    cd "$INSTALLDIR";

    # Remove the setup files
    rm -rf -- setup.data setup.sh

    # Create the extras
    mkdir XTRAS
    tar -C XTRAS -xvf readme.tar
    tar -C XTRAS -xvf extras.tar
    mv wop.png copyright_*.txt XTRAS/

    # Game data (mod pk3s)
    mkdir wop
    tar -C wop -xvf wop-data.tar

    # All the shell scripts are the same.
    cp -a bin/Linux/x86/WoP .
    rm -rf -- bin

    # Extract the right engine(s)
    archs=`uname -m`
    case "$archs" in
        i?86) archs=i386 ;;
        x86_64) archs="x86_64 i386" ;;
        ppc64) archs="ppc64 ppc" ;;
    esac
    for arch in $archs; do
        test -r wop-engine.$arch.tar || continue
        tar -xvf wop-engine.$arch.tar
    done

    # Delete installation copies
    rm -f -- extras.tar readme.tar wop-data.tar wop-engine.i386.tar
    rm -f -- wop-engine.ppc.tar wop-engine.x86_64.tar

    # Add to the readme (I don't know German)
    echo "Use 'WoP' to execute World of Padman.  It will setup the environment and use the right executable" >> README
}

echo "Untarring the installation files";
MS_untar_file;

echo "Installing the program";
WoP_install;

echo "Done setting up World of Padman"