#!/bin/sh
# Copyright 2009, 2010, 2011  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.


CWD=$(pwd)

PKGNAM=btrfs-progs
BUILD=${BUILD:-1}

NUMJOBS=${NUMJOBS:-" -j7 "}

# 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 | cut -f 3 -d - | cut -f 1 -d .)}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) export ARCH=i486 ;;
    arm*) export ARCH=arm ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
       *) export ARCH=$( uname -m ) ;;
  esac
fi

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

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

# 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 {} \;

# Build:
make $NUMJOBS || make || exit 1

# Install:
make install DESTDIR=$PKG || exit 1

# 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 stuff out of /usr/local:
mv $PKG/usr/local/bin $PKG/sbin
mv $PKG/usr/local/man $PKG/usr/man

# Do not ship libraries/include files.
# If there becomes a use for these outside of btrfs-progs, let me know.
rm -rf $PKG/usr/local

# According to https://btrfs.wiki.kernel.org/index.php/FAQ#When_will_Btrfs_have_a_fsck_like_tool.3F
# it is not 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) ; 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}-$VERSION
cp -a \
  COPYING* INSTALL README* \
  $PKG/usr/doc/${PKGNAM}-$VERSION

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

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