#!/bin/bash

# Copyright 2009, 2010, 2011, 2012, 2018  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=xz
VERSION=${VERSION:-$(echo $PKGNAM-*.tar.xz | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-2}

# 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

case "$ARCH" in
  i586)      SLKCFLAGS="-O2 -march=i586 -mtune=i686"
             LIBDIRSUFFIX=""
             ;;
  s390)      SLKCFLAGS="-O2"
             LIBDIRSUFFIX=""
             ;;
  powerpc)   SLKCFLAGS="-O2"
             LIBDIRSUFFIX=""
             ;;
  x86_64)    SLKCFLAGS="-O2 -fPIC"
             LIBDIRSUFFIX="64"
             ;;
  athlon-xp) SLKCFLAGS="-march=athlon-xp -O3 -pipe -fomit-frame-pointer"
             LIBDIRSUFFIX=""
             ;;
  arm)       SLKCFLAGS="-O2 -march=armv4 -mtune=xscale"
             LIBDIRSUFFIX=""
             ;;
  armel)     SLKCFLAGS="-O2 -march=armv4t"
             LIBDIRSUFFIX=""
             ;;
  *)         SLKCFLAGS="-O2"
             LIBDIRSUFFIX=""
             ;;
esac

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

TMP=${TMP:-/tmp}
PKG=$TMP/package-$PKGNAM
rm -rf $PKG
mkdir -p $TMP $PKG

cd $TMP
rm -rf $PKGNAM-$VERSION
tar xvf $CWD/$PKGNAM-$VERSION.tar.xz || exit 1
cd $PKGNAM-$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 {} \+

# Change default verbosity from V_WARNING to V_ERROR to prevent spamming
# the screen with messages concerning steps that xz it taking to reduce
# memory use (these aren't indicating any sort of failure, so...)
zcat $CWD/xz.default.verbosity.V_ERROR.diff.gz | patch -p1 --verbose || exit 1

CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --docdir=/usr/doc/xz-$VERSION \
  --sysconfdir=/etc \
  --mandir=/usr/man \
  --enable-shared \
  --disable-static \
  --disable-rpath \
  --program-prefix= \
  --program-suffix= \
  --build=$ARCH-slackware-linux || exit 1

make $NUMJOBS || make || exit 1
make DESTDIR=$PKG install || exit 1

# Don't ship .la files:
rm -f $PKG/{,usr/}lib${LIBDIRSUFFIX}/*.la

# It might be advisable to have the libraries in /lib${LIBDIRSUFFIX}:
mkdir -p $PKG/lib${LIBDIRSUFFIX}
mv $PKG/usr/lib${LIBDIRSUFFIX}/liblzma.so.* $PKG/lib${LIBDIRSUFFIX}
( cd $PKG/usr/lib${LIBDIRSUFFIX}
  rm -f liblzma.so
  ln -sf ../../lib${LIBDIRSUFFIX}/liblzma.so.? liblzma.so
)

# At least the xz binary should also be in /bin:
mkdir -p $PKG/bin
mv $PKG/usr/bin/xz $PKG/bin
( cd $PKG/usr/bin
  ln -sf ../../bin/xz .
)

# Strip binaries:
( cd $PKG
  find . | xargs file | grep "executable" | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null
  find . | xargs file | grep "shared object" | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null
)

# 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 $PKG/usr/doc/$PKGNAM-$VERSION
cp -a \
  ABOUT-NLS AUTHORS COPYING* INSTALL* NEWS PACKAGERS README* THANKS \
  $PKG/usr/doc/$PKGNAM-$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 $PKG/usr/doc/${PKGNAM}-$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

cd $PKG
/sbin/makepkg -l y -c n $TMP/${PKGNAM}-${VERSION}-${ARCH}-${BUILD}.txz