#!/bin/bash
#  Copyright (C) 2010, 2012  Matias A. Fonzo, <selk@dragora.org>
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -e

CWD=$(pwd)

TMP=${TMP:-/tmp/sources}
OUT=${OUT:-/tmp/packages}

V=2.4.5
ARCH=${ARCH:-x86_64}
B=2

PKG=${TMP}/package-ppp

rm -rf $PKG
mkdir -p $PKG $OUT

echo "Uncompressing the tarball..."
rm -rf ${TMP}/ppp-${V}
tar xvf ${CWD}/ppp-${V}.tar.lz -C $TMP

cd ${TMP}/ppp-${V}

# Set sane ownerships and permissions:
chown -R 0:0 .
find . \
 \( -perm 2777 -o \
    -perm 777  -o \
    -perm 775  -o \
    -perm 711  -o \
    -perm 555  -o \
    -perm 511     \
 \) -exec chmod 755 {} + \
  -o \
 \( -perm 666 -o \
    -perm 664 -o \
    -perm 600 -o \
    -perm 444 -o \
    -perm 440 -o \
    -perm 400    \
 \) -exec chmod 644 {} +

# Enable PPP packet filtering (requires libpcap):
sed -i 's%#FILTER=y%FILER=y%' \
 pppd/Makefile.linux

# Enable IPv6 support in pppd:
sed -i 's%#HAVE_INET6=y%HAVE_INET6=y%' \
 pppd/Makefile.linux

# Compile without debug information:
sed -i 's%COPTS = -O2 -pipe -Wall -g%COPTS = -O2 -fPIC -Wall%' \
 pppd/Makefile.linux

sed -i 's%-O2 -g -pipe%-O2%' chat/Makefile.linux

# To recent kernels:
rm -f include/linux/if_pppol2tp.h

# Fix the location of the plugins (under lib64):
( cd pppd/plugins
  for dir in pppoatm pppol2tp radius rp-pppoe ; do
    sed -i \
     's%LIBDIR = $(DESTDIR)/lib/pppd%LIBDIR = $(DESTDIR)/lib64/pppd%' \
      ${dir}/Makefile.linux
  done
)
sed -i 's%LIBDIR = $(DESTDIR)/lib/pppd%LIBDIR = $(DESTDIR)/lib64/pppd%' \
 pppd/plugins/Makefile.linux

./configure \
 --prefix=/usr \
 --mandir=/usr/man \
 --build=${ARCH}-dragora-linux-gnu

make
make install INSTROOT=$PKG

# Increments a little the security:
chmod 750 ${PKG}/usr/sbin/*

# Fix permissions:
( cd $PKG
  find . -perm 555 -exec chmod 755 '{}' +
  find . -perm 444 -exec chmod 644 '{}' +
)

# Strip binaries & libraries:
( cd $PKG
  find . -type f | xargs file | awk '/ELF/ && /executable/ || /shared object/' | \
   cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null
)

# Include scripts:
mkdir -p ${PKG}/etc/ppp/peers

mkdir -p ${PKG}/usr/sbin
install -m 750 scripts/pon ${PKG}/usr/sbin
install -m 750 scripts/poff ${PKG}/usr/sbin
install -m 750 scripts/plog ${PKG}/usr/sbin

# Add configuration files:
mkdir -p ${PKG}/etc/ppp
for file in etc.ppp/* ; do
  cat $file > ${PKG}/etc/ppp/${file##*/}.new
done
chmod 600 ${PKG}/etc/ppp/*-secrets*

# Move and compress man-pages:
if [[ -d ${PKG}/usr/share/man ]]; then
  ( cd ${PKG}/usr
    mv share/man/ .
    rmdir --ignore-fail-on-non-empty share/
  )
fi
gzip -9N ${PKG}/usr/man/man?/*

# Includes the man-page for pon:
mkdir -p ${PKG}/usr/man/man1
gzip -9Nc < scripts/pon.1 > ${PKG}/usr/man/man1/pon.1.gz

# Add the documentation:
mkdir -p ${PKG}/usr/doc/ppp-${V}
cp -a \
 FAQ PLUGINS README README.linux SETUP \
 ${PKG}/usr/doc/ppp-${V}

# Copy the description files:
mkdir -p ${PKG}/description
cp ${CWD}/description/* ${PKG}/description

# Make the post-install script:
mkdir -p ${PKG}/install
cat << "EOF" > ${PKG}/install/post-install
# Handle config files:
config() {
  local new old
  new="$1"
  old=${1%.new}
  if [ ! -r $old ]; then
    mv $new $old
  elif [ "$(md5sum $old | cut -f 1 -d ' ')" = "$(md5sum $new | cut -f 1 -d ' ')" ]; then
    rm $new
  else
    echo "You have a new config file \"${new}\" at your consideration."
  fi
}

for file in etc/ppp/*.new ; do
  config $file
done

EOF

cd $PKG
makepkg -l ${OUT}/ppp-${V}-${ARCH}-${B}.tlz