#!/bin/sh

# buildx.sh: a script for building X11R7.6 X server for use with xrdp
#
# Copyright 2011-2013 Jay Sorg Jay.Sorg@gmail.com
#
# Authors
#       Jay Sorg Jay.Sorg@gmail.com
#       Laxmikant Rashinkar LK.Rashinkar@gmail.com
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# debian packages needed
# flex bison libxml2-dev intltool xsltproc xutils-dev python-libxml2 g++ xutils

download_all_files()
{
    # download files parallelly using keepalive
    # a little bit faster than calling wget with single file more than 100 times
    < x11_file_list.txt cut -f1 -d: | sed -e "s|^|${download_url}/|" | \
        xargs -P2 -n $(expr $num_modules / 2 + 1) \
        wget \
          --directory-prefix=downloads \
          --no-verbose \
          --timestamping \
          --continue

    status=$?
    return $status
}

remove_modules()
{
    local mod_file mod_dir mod_args
    if [ -d cookies ]; then
        rm cookies/*
    fi

    if [ ! -d build_dir ]; then
        echo ""
        echo "build_dir does not exist; nothing to delete"
        echo ""
        exit 0
    fi

    while IFS=: read mod_file mod_dir mod_args
    do
        (cd build_dir; [ -d $mod_dir ] && rm -rf $mod_dir)
    done < $data_file
}

extract_it()
{
    local mod_file mod_name mod_args comp
    mod_file=$1
    mod_name=$2
    mod_args=$3

    if [ -e cookies/$mod_name.extracted ]; then
        return 0
    fi

    cd build_dir

    # if pkg has not yet been extracted, do so now
    if [ ! -d $mod_name ]; then
        case "$mod_file" in
        *.tar.bz2) comp=j ;;
        *.tar.gz) comp=z ;;
        *.tar.xz) comp=J ;;
        *.tar) comp= ;;
        *) echo "unknown compressed module $mod_name" ; exit 1 ;;
        esac
        if ! tar x${comp}f ../downloads/$mod_file > /dev/null
        then
            echo "error extracting module $mod_name"
            exit 1
        fi
    fi

    # patch and configure module - we only need to do this once
    cd $mod_name
    # check for patches
    if [ -e ../../$mod_name.patch ]; then
        patch -N -p1 < ../../$mod_name.patch
    fi
    # now configure
    echo "executing ./configure --prefix=$PREFIX_DIR $mod_args"
    if ! ./configure --prefix=$PREFIX_DIR $mod_args
    then
        echo "configuration failed for module $mod_name"
        exit 1
    fi

    cd ../..

    touch cookies/$mod_name.extracted
}

make_it()
{
    local mod_file mod_name mod_args
    mod_file=$1
    mod_name=$2
    mod_args=$3

    count=`expr $count + 1`

    # if a cookie with $mod_name exists...
    if [ -e cookies/$mod_name.installed ]; then
        # ...package has already been installed
        return 0
    fi

    echo ""
    echo "*** processing module $mod_name ($count of $num_modules) ***"
    echo ""

    if ! extract_it $mod_file $mod_name "$mod_args"
    then
        echo ""
        echo "extract failed for module $mod_name"
        echo ""
        exit 1
    fi

    # make module
    if [ ! -e cookies/$mod_name.made ]; then
        if ! make -j $NPROC -C build_dir/$mod_name
        then
            echo ""
            echo "make failed for module $mod_name"
            echo ""
            exit 1
        fi
        touch cookies/$mod_name.made
    fi

    # install module
    if ! make -C build_dir/$mod_name install
    then
        echo ""
        echo "make install failed for module $mod_name"
        echo ""
        exit 1
    fi

    touch cookies/$mod_name.installed
    return 0
}

# this is where we store list of modules to be processed
data_file=x11_file_list.txt

# this is the default download location for most modules
# changed now to server1.xrdp.org
# was www.x.org/releases/X11R7.6/src/everything
download_url=http://server1.xrdp.org/xrdp/X11R7.6

num_modules=`wc -l < $data_file`
count=0

##########################
# program flow starts here
##########################

if [ $# -lt 1 ]; then
    echo ""
    echo "usage: buildx.sh <installation dir>"
    echo "usage: buildx.sh clean"
    echo "usage: buildx.sh default"
    echo "usage: buildx.sh <installation dir> drop - set env and run bash in rdp dir"
    echo ""
    exit 1
fi

# remove all modules
if [ "$1" = "clean" ]; then
    echo "removing source modules"
    remove_modules
    exit 0
fi

if [ "$1" = "default" ]; then
    export PREFIX_DIR=$PWD/staging
else
    export PREFIX_DIR=$1
fi

# prefix dir must exist...
if [ ! -d $PREFIX_DIR ]; then
    echo "$PREFIX_DIR does not exist, creating it"
    if ! mkdir -p $PREFIX_DIR; then
        echo "$PREFIX_DIR cannot be created - cannot continue"
        exit 1
    fi
fi

# ...and be writable
if [ ! -w $PREFIX_DIR ]; then
    echo "$PREFIX_DIR is not writable - cannot continue"
    exit 1
fi

echo "installation directory: $PREFIX_DIR"

export PKG_CONFIG_PATH=$PREFIX_DIR/lib/pkgconfig:$PREFIX_DIR/share/pkgconfig
export PATH=$PREFIX_DIR/bin:$PATH
export LDFLAGS=-Wl,-rpath=$PREFIX_DIR/lib
export CFLAGS="-I$PREFIX_DIR/include -fPIC -O2"

# create a downloads dir
if [ ! -d downloads ]; then
    if ! mkdir downloads
    then
        echo "error creating downloads directory"
        exit 1
    fi
fi

# this is where we do the actual build
if [ ! -d build_dir ]; then
    if ! mkdir build_dir
    then
        echo "error creating build_dir directory"
        exit 1
    fi
fi

# this is where we store cookie files
if [ ! -d cookies ]; then
    if ! mkdir cookies
    then
        echo "error creating cookies directory"
        exit 1
    fi
fi

if ! NPROC=`nproc`; then
    NPROC=1
fi

if ! download_all_files; then
    echo ""
    echo "download failed - aborting build"
    echo "rerun this script to resume download/build"
    echo ""
    exit 1
fi

while IFS=: read mod_file mod_dir mod_args
do
    mod_args=`eval echo $mod_args`

    make_it $mod_file $mod_dir "$mod_args"
done < $data_file

echo "build for X OK"

X11RDPBASE=$PREFIX_DIR
export X11RDPBASE

if ! make -C rdp
then
    echo "error building rdp"
    exit 1
fi

# this will copy the build X server with the other X server binaries
cd rdp
strip X11rdp
cp X11rdp $X11RDPBASE/bin

if [ "$2" = "drop" ]; then
    echo ""
    echo "dropping you in dir, type exit to get out"
    bash
    exit 1
fi

echo "All done"