#!/bin/bash

# Copyright 2008, 2009, 2010, 2013, 2014, 2017, 2018, 2020, 2021  Patrick J. Volkerding, Sebeka, MN, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

cd $(dirname $0) ; CWD=$(pwd)

PKGNAM=dhcpcd
VERSION=${VERSION:-$(echo dhcpcd-*.tar.?z | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-2}

# By default, Slackware builds dhcpcd with privilege separation, which improves
# security by ensuring that any security vulnerabilies such as buffer overflows
# or shell metacharacter insertion would gain access to an unprivileged user
# (the dhcpcd user) rather than the root user.
PRIVSEP=${PRIVSEP:-yes}

NUMJOBS=${NUMJOBS:-" -j$(expr $(nproc) + 1) "}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) export ARCH=i586 ;;
    arm*) export ARCH=arm ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
       *) export ARCH=$( uname -m ) ;;
  esac
fi

# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
# the name of the created package would be, and then exit. This information
# could be useful to other scripts.
if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PKGNAM-$VERSION-$ARCH-$BUILD.txz"
  exit 0
fi

TMP=${TMP:-/tmp}
PKG=$TMP/package-dhcpcd

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "s390" ]; then
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

rm -rf $PKG
mkdir -p $TMP $PKG
cd $TMP
rm -rf dhcpcd-$VERSION
tar xvf $CWD/dhcpcd-$VERSION.tar.?z || exit 1
cd dhcpcd-$VERSION
chown -R root:root .
find . \
 \( -perm 777 -o -perm 775 -o -perm 711 -o -perm 555 -o -perm 511 \) \
 -exec chmod 755 {} \+ -o \
 \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
 -exec chmod 644 {} \+

patch -p1 --verbose < $CWD/patches/dhcpcd.conf-Don-t-invoke-wpa_supplicant-by-default.patch || exit 1
patch -p1 --verbose < $CWD/patches/use-hostname_short-in-dhcpcd.conf.patch || exit 1
patch -p1 --verbose < $CWD/patches/dhcpcd.conf-request_ntp_server_by_default.patch || exit 1
patch -p1 --verbose < $CWD/patches/645c32dd1a511527b7eb88443a28dfe7704d5f52.patch || exit 1
patch -p1 --verbose < $CWD/patches/38befd4e867583002b96ec39df733585d74c4ff5.patch || exit 1

# At this point, it should be safe to assume that /var will be mounted by the
# time dhcpcd is called, as all non-root local filesystems are mounted from
# /etc/rc.d/rc.S, and /var should not be on a network filesystem.  As such,
# we'll use the FHS layout instead of putting things in /etc/dhcpc 

# Set options to build with or without privsep:
if [ "$PRIVSEP" = "yes" ]; then
  PRIVSEP_OPTIONS="--enable-privsep --privsepuser=dhcpcd"
  unset TAG
else
  PRIVSEP_OPTIONS="--disable-privsep"
  TAG="_noprivsep"
fi

# Yes, /lib/dhcpcd is correct, even on x86_64.
CFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --sbindir=/sbin \
  --sysconfdir=/etc \
  --dbdir=/var/lib/dhcpcd \
  --libexecdir=/lib/dhcpcd \
  --mandir=/usr/man \
  --rundir=/run \
  $PRIVSEP_OPTIONS \
  --build=$ARCH-slackware-linux || exit 1

make $NUMJOBS || make || exit 1
make install DESTDIR=$PKG HOOKSCRIPTS="50-ntp.conf 50-yp.conf" || exit 1

find $PKG | xargs file | grep -e "executable" -e "shared object" \
  | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null

# Let's not clobber the config file
mv $PKG/etc/dhcpcd.conf $PKG/etc/dhcpcd.conf.new

# Compress and link manpages, if any:
if [ -d $PKG/usr/man ]; then
  ( cd $PKG/usr/man
    for manpagedir in $(find . -type d -name "man*") ; do
      ( cd $manpagedir
        for eachpage in $( find . -type l -maxdepth 1) ; do
          ln -s $( readlink $eachpage ).gz $eachpage.gz
          rm $eachpage
        done
        gzip -9 *.?
      )
    done
  )
fi

mkdir -p $PKG/usr/doc/dhcpcd-$VERSION
cp -a BUILDING* LICENSE* README* $PKG/usr/doc/dhcpcd-$VERSION

# If there's a ChangeLog, installing at least part of the recent history
# is useful, but don't let it get totally out of control:
if [ -r ChangeLog ]; then
  DOCSDIR=$(echo $PKG/usr/doc/*-$VERSION)
  cat ChangeLog | head -n 1000 > $DOCSDIR/ChangeLog
  touch -r ChangeLog $DOCSDIR/ChangeLog
fi

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc
zcat $CWD/doinst.sh.gz > $PKG/install/doinst.sh

cd $PKG
/sbin/makepkg -l y -c n $TMP/dhcpcd-$VERSION-$ARCH-$BUILD$TAG.txz