#!/bin/bash

# Copyright 2013, 2014, 2016, 2017, 2018, 2019, 2022  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=elilo
VERSION=${VERSION:-$(echo $PKGNAM*.tar.?z* | rev | cut -f 2 -d - | rev)}
BUILD=${BUILD:-16}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
    loongarch64) ARCH=loong64 ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

TMP=${TMP:-/tmp}
PKG=$TMP/package-$PKGNAM

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
elif [ "$ARCH" = "loong64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
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

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf elilo
mkdir elilo
cd elilo
tar xvf $CWD/${PKGNAM}-$VERSION-all.tar.?z* || exit 1
tar xvf elilo-${VERSION}-source.tar.gz || exit 1

# The tarball extracted below contains rebuilt versions of the x86_64 and
# ia32 elilo, which were extracted from $TMP/elilo/elilo-${VERSION}-source/
# after building under both architectures. This approach simplifies making
# changes to other parts of the package without needlessly complicating
# things, as the loaders themselves seldom need to be rebuilt. Besides,
# elilo can be rather fragile, so we don't want to rebuild it without a
# good reason and risk breaking it.
#
# These EFI binaries were built with Slackware 14.2. Newer compilers might
# cause bloat, or other issues.
tar xvf $CWD/elilo.loader.binaries.tar.xz || exit 1

chown -R root:root .
chmod -R u+w,go+r-w,a-s .
cd elilo-${VERSION}-source || cd elilo || exit

sed -i "s,/usr/lib,/usr/lib${LIBDIRSUFFIX},g" Make.defaults
sed -i "s,EFICRT0.*= /usr/lib${LIBDIRSUFFIX},EFICRT0    = /usr/lib${LIBDIRSUFFIX}/gnuefi,g" Make.defaults
sed -i "s,dpkg-architecture -qDEB_BUILD_ARCH,uname -m,g" Make.defaults

# Fix collision with StrnCpy() function in both elilo and gnu-efi:
grep -r -l StrnCpy * | xargs sed -i "s/StrnCpy/elilo_StrnCpy/g"

# Increase kernel size limit from 8MB to 16MB (nobody will ever need more than 640K ;-):
zcat $CWD/elilo.double.kernel.size.limit.diff.gz | patch -p1 --verbose || exit 1

# Disable the Confidential Computing blob which was leading to boot failures
# with the 5.19.0 kernel and the EFI stub enabled:
zcat $CWD/elilo.zeroes.cc_blob_address.diff.gz | patch -p1 --verbose || exit 1

# We will build the tools from source.
# However, we will package the pre-built EFI binaries, since we would
# like to include both 32-bit and 64-bit x86 EFI loaders in the
# finished package.
# To build everything, you'll need to *not* change into the tools directory,
# instead running "make" here in the top-level. Please note that due to
# memory exhaustion issues, to build the 32-bit loader you will need to
# use a 32-bit userspace with an x86_64 kernel.
cd tools
make || exit 1
cd ..

# Install the files in the package directory:
mkdir -p $PKG/usr/sbin
cp tools/eliloalt $PKG/usr/sbin

# Install eliloconfig, a simple setup script:
cp -a $CWD/eliloconfig $PKG/usr/sbin
chown root:root $PKG/usr/sbin/eliloconfig
chmod 755 $PKG/usr/sbin/eliloconfig
mkdir -p $PKG/var/log/setup
cp -a $CWD/setup.ll.eliloconfig $PKG/var/log/setup
chown root:root $PKG/var/log/setup/setup.ll.eliloconfig
chmod 755 $PKG/var/log/setup/setup.ll.eliloconfig

mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION
cp -a \
  ChangeLog LIMITATIONS README README.gnu-efi TODO docs/* \
  examples \
  $PKG/usr/doc/$PKGNAM-$VERSION

# Since it might not be safe to strip the EFI binaries, do this now:
( 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
)

cd ..

# Install EFI bootloaders in /boot:
mkdir $PKG/boot
# The ia32 version is pretty much useless, since 32-bit UEFI is nowhere to be
# found.  Maybe it would help old 32-bit Intel Macs though?
cp -a elilo*ia32.efi $PKG/boot/elilo-ia32.efi
# Itanium binary isn't needed here.
#cp -a elilo*ia64.efi $PKG/boot/elilo-ia64.efi
cp -a elilo*x86_64.efi $PKG/boot/elilo-x86_64.efi

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