#!/bin/sh

# Slackware build script for rust

# Copyright 2017  Andrew Clemons, Wellington, New Zealand
# 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.

PRGNAM=rust
SRCNAM="${PRGNAM}c"
VERSION=${VERSION:-1.20.0}

# src/stage0.txt
RSTAGE0_VERSION=${RSTAGE0_VERSION:-1.19.0}
RSTAGE0_DIR=${RSTAGE0_DIR:-2017-07-20}
CSTAGE0_VERSION=${CSTAGE0_VERSION:-0.20.0}
CSTAGE0_DIR=${CSTAGE0_DIR:-$RSTAGE0_DIR}

BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i686 ;;
    armv7*) ARCH=$( uname -m ) ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

# Bootstrapping ARCH:
if [ "$ARCH" = "i586" ]; then
  BARCH="i686"
elif case $ARCH in armv7*) true;; *) false;; esac; then
  BARCH="armv7"
else
  BARCH="$ARCH"
fi

# Bootstrapping ABI:
if case $ARCH in armv7*) true;; *) false;; esac; then
  BABI="gnueabihf"
elif [ "$ARCH" = "arm" ]; then
  BABI="gnueabi"
else
  BABI="gnu"
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"
elif case $ARCH in armv7*) true;; *) false;; esac; then
  SLKCFLAGS="-O2 -march=armv7-a -mfpu=vfpv3-d16"
  LIBDIRSUFFIX=""
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $SRCNAM-$VERSION-src
tar xvf $CWD/$SRCNAM-$VERSION-src.tar.gz
cd $SRCNAM-$VERSION-src

# if you already have rust and cargo installed, you can bootstrap from the
# previous version.
if [ "$LOCAL_BOOTSTRAP" = "" ] && [ -x /usr/bin/cargo ] && [ -x /usr/bin/rustc ] ; then
  LOCAL_BOOTSTRAP=yes
fi

if [ "$LOCAL_BOOTSTRAP" != "yes" ] ; then
  # rust requires bootstrapping with the previous rust version.
  # versions are defined in src/stage0.txt
  mkdir -p build/cache/$RSTAGE0_DIR
  cp $CWD/$PRGNAM-std-$RSTAGE0_VERSION-$BARCH-unknown-linux-$BABI.tar.gz \
     $CWD/$SRCNAM-$RSTAGE0_VERSION-$BARCH-unknown-linux-$BABI.tar.gz \
     build/cache/$RSTAGE0_DIR

  mkdir -p build/cache/$CSTAGE0_DIR
  cp $CWD/cargo-$CSTAGE0_VERSION-$BARCH-unknown-linux-$BABI.tar.gz build/cache/$CSTAGE0_DIR
fi

# src/bootstrap/config.toml.example
cat << EOF > config.toml
[build]
vendor = true
extended = true

[install]
prefix = "/usr"
docdir = "doc/rust-$VERSION"
libdir = "lib$LIBDIRSUFFIX"
mandir = "man"

[rust]
codegen-units = 0
debuginfo = true
channel = "stable"
rpath = false
codegen-tests = false

[target.$BARCH-unknown-linux-$BABI]
llvm-config = "/usr/bin/llvm-config"
EOF

if [ "$LOCAL_BOOTSTRAP" = "yes" ] ; then
  sed -i "s|^\(extended = true\)$|\1\nrustc = \"/usr/bin/rustc\"\ncargo = \"/usr/bin/cargo\"|" config.toml
fi

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 {} \;

export RUSTFLAGS="$RUSTFLAGS -C link-args=-lffi"

# README.md says gcc 4.7 / clang 3.x or later needed
# but building fails for me with GCC 5.3 from slackware 14.2
CC=clang \
CXX=clang++ \
CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
python x.py build
DESTDIR=$PKG python x.py install

# Eh, none of this is all that big. Might as well leave it around as a
# reference.
#rm -f $PKG/usr/lib$LIBDIRSUFFIX/rustlib/components
#rm -f $PKG/usr/lib$LIBDIRSUFFIX/rustlib/install.log
#rm -f $PKG/usr/lib$LIBDIRSUFFIX/rustlib/manifest-*
#rm -f $PKG/usr/lib$LIBDIRSUFFIX/rustlib/rust-installer-version
#rm -f $PKG/usr/lib$LIBDIRSUFFIX/rustlib/uninstall.sh
# Make sure the paths are correct, though:
sed -i "s,/tmp/package-rust/,/,g" $PKG/usr/lib$LIBDIRSUFFIX/rustlib/install.log $PKG/usr/lib$LIBDIRSUFFIX/rustlib/manifest-*
# And a little compression doesn't hurt either:
gzip -9 $PKG/usr/lib$LIBDIRSUFFIX/rustlib/manifest-*

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

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 *.md COPYRIGHT* LICENSE* $PKG/usr/doc/$PRGNAM-$VERSION
# Include licenses from third party vendors:
mkdir $PKG/usr/doc/$PRGNAM-$VERSION/vendor
( cd src/vendor
  tar cf - $(find . -maxdepth 2 | grep -e README -e LICENSE -e COPYING -e CHANGELOG -e PERFORMANCE -e UPGRADE ) | ( cd $PKG/usr/doc/$PRGNAM-$VERSION/vendor ; tar xf - )
)
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}