#!/bin/bash

# Copyright 2018, 2019, 2020  Eric Hameleers, Eindhoven, NL
# Copyright 2020  Patrick J. Volkerding, Sebeka, Minnesota, 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=cryfs
VERSION=${VERSION:-$(echo $PKGNAM-*.tar.?z | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-13}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$(uname -m)" in
    i?86) ARCH=i586 ;;
    arm*) readelf /usr/bin/file -A | grep -E -q "Tag_CPU.*[4,5]" && ARCH=arm || ARCH=armv7hl ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
    *) ARCH=$(uname -m) ;;
  esac
  export ARCH
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

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

if [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=pentium4 -mtune=generic"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -march=x86-64 -mtune=generic -fPIC"
  LIBDIRSUFFIX="64"
elif [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "armv7hl" ]; then
  SLKCFLAGS="-O2 -fPIC -mfpu=neon"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "or1k" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX=""
else
  SLKCFLAGS=${SLKCFLAGS:-"-O2 -fPIC"}
  LIBDIRSUFFIX=${LIBDIRSUFFIX:-""}
fi

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.?z || exit 1
cd $PKGNAM-$VERSION || exit 1

# Fix building for bigendian or1k
sed -i -e "s/defined(__ARMEB__)/defined(__ARMEB__) || defined(__or1k__)/" vendor/cryptopp/vendor_cryptopp/config.h

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 {} \+

# Oddly, cryfs expects a static boost, so we'll need to hit it with the LART:
export LDFLAGS="$SLKLDFLAGS -lboost_thread -lboost_program_options -lboost_filesystem -lboost_chrono -lcryptopp -lfuse"

case "$ARCH" in
  arm|mips|mipsel|ppc|or1k|sh4)
    export LDFLAGS="$LDFLAGS -latomic"
    ;;
esac

# gcc11 fixes:
zcat $CWD/27587ea1acec5f939a31217f1c43953378f18821.patch.gz | patch -p1 --verbose || exit 1

# Boost 1.77.0 fix:
zcat $CWD/041b5baea5a4efceff33df2f316646b47a1cd7c0.patch.gz | patch -p1 --verbose || exit 1

# Fix for gcc13 in case we're still using this since we don't want conan ;-)
zcat $CWD/cryfs.gcc13.diff.gz | patch -p1 --verbose || exit 1

# Configure, build, and install:
mkdir cmake-build
cd cmake-build
  cmake \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_C_FLAGS_RELEASE:STRING="$SLKCFLAGS" \
    -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_CXX_FLAGS_RELEASE:STRING="$SLKCFLAGS" \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DCMAKE_INSTALL_MANDIR=/usr/man \
    -DCMAKE_SKIP_RPATH=ON \
    -DBUILD_TESTING=OFF \
    -DBUILD_SHARED_LIBS=ON \
    -DBUILD_TESTING=OFF \
    -DBoost_INCLUDE_DIRS=/usr/include/boost \
    -DBoost_USE_STATIC_LIBS=OFF \
    -DCRYFS_UPDATE_CHECKS=OFF \
    .. || exit 1
  make $NUMJOBS || make || exit 1
  make install DESTDIR=$PKG || exit 1
  # When compiling against a shared boost, these fail to install properly without help:
  mkdir -p $PKG/usr/lib${LIBDIRSUFFIX}
  install -m0755 ./src/cryfs-cli/libcryfs-cli.so $PKG/usr/lib${LIBDIRSUFFIX}/libcryfs-cli.so
  install -m0755 ./src/cryfs-unmount/libcryfs-unmount.so $PKG/usr/lib${LIBDIRSUFFIX}/libcryfs-unmount.so
cd ..

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

# Compress manual pages:
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

# Add a documentation directory:
mkdir -p $PKG/usr/doc/${PKGNAM}-$VERSION
cp -a \
  ChangeLog* README* LICENSE* \
  $PKG/usr/doc/${PKGNAM}-$VERSION

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