#!/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=4.2.3-P2
ARCH=${ARCH:-x86_64}
B=3

# Flags for the compiler:
DCFLAGS=${DCFLAGS:=-O2 -mtune=generic}

PKG=${TMP}/package-dhcp

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

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

cd ${TMP}/dhcp-${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 {} +

# Apply this patch to use iproute2 instead of
# the deprecated "ifconfig/route":
#zcat ${CWD}/dhclient-to-iproute2.diff.gz | patch -p1 --verbose

# A better patch from BLFS, thanks!:
zcat ${CWD}/dhcp-4.2.3-iproute2-1.patch.gz | patch -p1 --verbose

CFLAGS="$DCFLAGS" \
./configure \
 --prefix=/usr \
 --libdir=/usr/lib64 \
 --sysconfdir=/etc \
 --sbindir=/sbin \
 --localstatedir=/var \
 --infodir=/usr/info \
 --mandir=/usr/man \
 --with-srv-lease-file=/var/state/dhcp/dhcpd.leases \
 --with-srv6-lease-file=/var/state/dhcp/dhcpd6.leases \
 --with-cli-lease-file=/var/state/dhcp/dhclient.leases \
 --with-cli6-lease-file=/var/state/dhcp/dhclient6.leases \
 --build=${ARCH}-dragora-linux-gnu

make
make install DESTDIR=$PKG

# 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
  find . -type f | xargs file | awk '/current ar archive/' | \
   cut -f 1 -d : | xargs strip --strip-debug 2> /dev/null
)

# Add runit services:
mkdir -p ${PKG}/etc/sv/dhclient

install -m 755 ${CWD}/config/dhclient/run \
 ${PKG}/etc/sv/dhclient/run.new

mkdir -p ${PKG}/etc/runit/runsvdir/default
( cd ${PKG}/etc/runit/runsvdir/default
  ln -sf /etc/sv/dhclient .
)

# Add "empty" configuration files:
mkdir -p ${PKG}/etc
cat ${CWD}/config/dhclient.conf > ${PKG}/etc/dhclient.conf
cat ${CWD}/config/dhcpd.conf > ${PKG}/etc/dhcpd.conf

# Add the dhclient script:
mkdir -p ${PKG}/sbin
cp -a client/scripts/linux ${PKG}/sbin/dhclient-script

# This is required by dhcpd:
mkdir -p ${PKG}/var/state/dhcp
touch ${PKG}/var/state/dhcp/dhcpd.leases.new
rm -f ${PKG}/var/state/dhcp/dhcpd.leases

# Set permissions:
find ${PKG}/sbin -type f -exec chmod -v 0750 '{}' +

# Fix man-pages (just in case):
find ${PKG}/usr/man -type f -exec chmod -v 0644 '{}' +
# Compress man-pages:
gzip -9N ${PKG}/usr/man/man?/*.?

# Add the documentation:
mkdir -p ${PKG}/usr/doc/dhcp-${V}/examples
cp -a \
 LICENSE README RELNOTES \
 ${PKG}/usr/doc/dhcp-${V}
# Add examples:
cp -a \
 client/dhclient.conf server/dhcpd.conf \
 ${PKG}/usr/doc/dhcp-${V}/examples

# 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 $new
  else
    echo "You have a new config file \"${ROOT}/${new}\" at your consideration."
  fi
}

config var/state/dhcp/dhcpd.leases.new
rm -f var/state/dhcp/dhcpd.leases.new

config etc/sv/dhclient/run.new

EOF

cd $PKG
makepkg -l ${OUT}/dhcp-${V%%-*}-${ARCH}-${B}.tlz