#!/bin/bash
# Copyright 2009, 2010, 2011, 2015, 2017  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=btrfs-progs
BUILD=${BUILD:-1}

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

# Download the btrfs-progs Git head if there's no tarball:
if ! /bin/ls $CWD/btrfs-progs*tar* 1> /dev/null 2> /dev/null ; then
  git clone git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-progs.git
  rm -r btrfs-progs/.git
  tar cf btrfs-progs-$(date +%Y%m%d).tar btrfs-progs
  xz -9 btrfs-progs-$(date +%Y%m%d).tar
  rm -r $CWD/btrfs-progs
fi

VERSION=${VERSION:-$(echo $PKGNAM-*.tar.xz | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}

# 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-$(echo $VERSION | tr -d v)-$ARCH-$BUILD.txz"
  exit 0
fi

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "s390" ]; then
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
elif [ "$ARCH" = "armv7hl" ]; then
  SLKCFLAGS="-O3 -march=armv7-a -mfpu=vfpv3-d16"
  LIBDIRSUFFIX=""
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

if [ "$TMP" = "" ]; then
  TMP=/tmp
fi
PKG=$TMP/package-${PKGNAM}
rm -rf $PKG
mkdir -p $PKG

cd $TMP
rm -rf btrfs-progs-$VERSION
tar xvf $CWD/$PKGNAM-$VERSION.tar.xz || exit 1
cd btrfs-progs-$VERSION || exit 1

# Make sure ownerships and permissions are sane:
chown -R root:root .
find . -perm 666 -exec chmod 644 {} \+
find . -perm 664 -exec chmod 644 {} \+
find . -perm 600 -exec chmod 644 {} \+
find . -perm 444 -exec chmod 644 {} \+
find . -perm 400 -exec chmod 644 {} \+
find . -perm 440 -exec chmod 644 {} \+
find . -perm 777 -exec chmod 755 {} \+
find . -perm 775 -exec chmod 755 {} \+
find . -perm 511 -exec chmod 755 {} \+
find . -perm 711 -exec chmod 755 {} \+
find . -perm 555 -exec chmod 755 {} \+

# KLUDGE for 6.2 build failure
if [ ! -r include/config.h.in ]; then
  cp -a config.h.in include
fi

# Configure:
CFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --bindir=/sbin \
  --sysconfdir=/etc \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --mandir=/usr/man \
  --infodir=/usr/info \
  --build=$ARCH-slackware-linux || exit 1

# Build and install:
make $NUMJOBS || make || exit 1
make install DESTDIR=$PKG || exit 1

# Don't ship static library:
rm -f $PKG/usr/lib${LIBDIRSUFFIX}/*.a

# 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
)

# Move manpages:
mv $PKG/usr/share/man $PKG/usr/man
rmdir $PKG/usr/share

# According to https://btrfs.wiki.kernel.org/index.php/FAQ#When_will_Btrfs_have_a_fsck_like_tool.3F
# it is safe and recommended to make fsck.btrfs a no-op by linking it to /bin/true:
ln -sf /bin/true $PKG/sbin/fsck.btrfs

# 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 $( find . -type l -maxdepth 1 | grep -v '\.gz$') ; do
          ln -s $( readlink $eachpage ).gz $eachpage.gz
          rm $eachpage
        done
        gzip -9 *.?
      )
    done
  )
fi

# Add a documentation directory:
mkdir -p $PKG/usr/doc/${PKGNAM}-$(echo $VERSION | tr -d v)
cp -a \
  COPYING* INSTALL README* \
  $PKG/usr/doc/${PKGNAM}-$(echo $VERSION | tr -d v)

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

cd $TMP/package-${PKGNAM}
/sbin/makepkg -l y -c n $TMP/${PKGNAM}-$(echo $VERSION | tr -d v)-$ARCH-$BUILD.txz