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#!/bin/sh

# Slackware build script for busybox

# Copyright 2018 Jan F. Chadima <jfch@jagda.eu>
# 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.

PRGNAM=busybox
VERSION=${VERSION:-1.28.1}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}
K_CONFIG=${K_CONFIG:-4}		# set to 2 for kernel 2.*.*

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

CWD=$(pwd)
TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

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

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
tar xvf $CWD/$PRGNAM-$VERSION.tar.bz2
cd $PRGNAM-$VERSION
chown -R root:root .
find -L . \
 \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
  -o -perm 511 \) -exec chmod 755 {} \; -o \
 \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

CONFIG_VER=$(echo "$VERSION" | sed 's/[0-9]*$/x/')

# Do not put busybox to the path directly. Link it where is necesary;
# or modify the PATH.
sed -e "s#^CONFIG_PREFIX=.*#CONFIG_PREFIX=\"$PKG/lib$LIBDIRSUFFIX/busybox\"#" \
  $CWD/$K_CONFIG-busybox-dot-config.$CONFIG_VER > .config

make oldconfig
CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
make
make install DESTDIR=$PKG

# Put it all to one directory
(cd $PKG/lib$LIBDIRSUFFIX/busybox
  if [ -d bin ] ; then
    mv bin/* .
    rmdir bin
  fi
  if [ -d sbin ] ; then
    for fn in sbin/* ; do
      ln -sf busybox "$(basename "$fn")"
    done
    rm -rf sbin
  fi
)

find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

# Install man page
mkdir -p $PKG/usr/man/man1
cat docs/busybox.1 > $PKG/usr/man/man1/busybox.1

find $PKG/usr/man -type f -exec gzip -9 {} \;
for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a \
  AUTHORS* LICENSE* README* TODO* \
  $PKG/usr/doc/$PRGNAM-$VERSION

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION/txt
cp -a \
  docs/*.txt \
  $PKG/usr/doc/$PRGNAM-$VERSION/txt

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION/html
cp -a \
  docs/*.html docs/cgi docs/busybox.net \
  $PKG/usr/doc/$PRGNAM-$VERSION/html

cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}