#!/bin/sh

# Copyright 2017  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.

PKGNAM=rustc
VERSION=${VERSION:-$(echo $PKGNAM-*.tar.gz | cut -d - -f 2)}
NUMJOBS=${NUMJOBS:-" -j7 "}
BUILD=${BUILD:-1}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i686 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

CWD=$(pwd)
TMP=${TMP:-/tmp}
PKG=$TMP/package-$PKGNAM

if [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
  TRIPLE="$ARCH-unknown-linux-gnu"
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
  TRIPLE="$ARCH-unknown-linux-gnu"
elif [ "$ARCH" = "arm" ]; then
  SLKCFLAGS="-O2 -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=hard"
  LIBDIRSUFFIX=""
  TRIPLE="armv7-unknown-linux-gnueabihf"
else
  echo "$ARCH is unsupported" ; exit 1
fi

# Bootstrapping from scratch, set the channel and date from src/stage0.txt
BOOTSTRAP_CHANNEL=$(tar -x $PKGNAM-$VERSION-src/src/stage0.txt -f $PKGNAM-$VERSION-src.tar.gz -O | grep ^rust | cut -d\  -f2 | cut -d- -f1)
BOOTSTRAP_DATE=$(tar -x $PKGNAM-$VERSION-src/src/stage0.txt -f $PKGNAM-$VERSION-src.tar.gz -O | grep ^rust | cut -d\  -f2 | cut -d- -f2-4)
BOOTSTRAP_CARGO=$(tar -x $PKGNAM-$VERSION-src/src/stage0.txt -f $PKGNAM-$VERSION-src.tar.gz -O | grep ^cargo | cut -d\  -f2)

rm -rf $PKG
mkdir -p $TMP $PKG

cd $TMP
rm -rf $PKGNAM-$VERSION-src
tar xvf $CWD/$PKGNAM-$VERSION-src.tar.gz || exit 1
cd $PKGNAM-$VERSION-src

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 {} \;

## Bootstrapping using rustbuild needs these
#mkdir -p build/cache/$BOOTSTRAP_DATE build/cache/$BOOTSTRAP_CARGO
#ln -s $CWD/bootstrap/rust-std-$BOOTSTRAP_CHANNEL-$TRIPLE.tar.gz \
#  build/cache/$BOOTSTRAP_DATE/
#ln -s $CWD/bootstrap/rustc-$BOOTSTRAP_CHANNEL-$TRIPLE.tar.gz \
#  build/cache/$BOOTSTRAP_DATE/
#ln -s $CWD/bootstrap/cargo-nightly-$TRIPLE.tar.gz \
#  build/cache/$BOOTSTRAP_CARGO/

# Bootstrapping *not* using rustbuild needs this
mkdir -p dl
ln -s $CWD/bootstrap/rustc-$BOOTSTRAP_CHANNEL-$TRIPLE.tar.gz dl/

# rustbuild seems not mature yet: make install ignores DESTDIR :/
CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --sysconfdir=/etc \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --mandir=/usr/man \
  --datadir=/usr/share \
  --docdir=/usr/doc/$PKGNAM-$VERSION \
  --release-channel=stable \
  --disable-rustbuild \
  --disable-jemalloc \
  --disable-codegen-tests \
  --build=$TRIPLE

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

( cd $PKG/usr/lib$LIBDIRSUFFIX/rustlib
  rm components manifest-rustc rust-installer-version install.log uninstall.sh
  cd ..
  ln -sf rustlib/$ARCH-unknown-linux-gnu/lib/*.so . )

# Compress and if needed symlink the man pages:
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

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

mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION
cp -a *.md COPYRIGHT LICENSE-APACHE LICENSE-MIT $PKG/usr/doc/$PKGNAM-$VERSION
cat $CWD/$PKGNAM.SlackBuild > $PKG/usr/doc/$PKGNAM-$VERSION/$PKGNAM.SlackBuild

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

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