#!/bin/bash

# Copyright 2013, 2016, 2017, 2018, 2019, 2023, 2024, 2025, 2026  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.

# Modified 2016 by Eric Hameleers <alien@slackware.com> for Slackware Live Edition.

cd $(dirname $0) ; CWD=$(pwd)

PKGNAM=grub
VERSION=${VERSION:-$(echo $PKGNAM-*.tar.xz | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
# Better to use _ than ~ in the package filenames version:
PKGVER=$(echo $VERSION | tr '~' '_')
BUILD=${BUILD:-3}

# If you use stack-protector, then grub will not work with legacy BIOS:
STACKPROTECT=${STACKPROTECT:---enable-stack-protector=no}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$(uname -m)" in
    i?86) ARCH=i686 ;;
    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-$PKGVER-$ARCH-$BUILD.txz"
  exit 0
fi

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

if [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-mtune=generic"
  EFI32_FLAGS=" --with-platform=efi --target=i386 --program-prefix= "
  # Also build the x86_64-efi target on 32-bit.
  # With this, one can boot a 32-bit kernel from UEFI.
  # The efivars won't mount, so GRUB cannot add itself to the UEFI boot menu,
  # but that can be worked around.
  # To install EFI GRUB from 32-bit, you'll need to make sure that /boot/efi
  # is mounted, and then issue this command:
  # grub-install --target=x86_64-efi --efi-directory=/boot/efi --recheck --no-nvram
  #EFI_FLAGS=" --with-platform=efi --target=x86_64 --program-prefix= "
  # NOTE ABOUT THE ABOVE: Sorry, it seemed like a good idea but this target won't
  # build under 32-bit due to lack of support in cc1 and the assembler. It's not
  # really worth it to try to add such support just for this purpose. But if
  # someone really needs to run 32-bit (for say an old proprietary program) on
  # a machine that does not support legacy boot, they can install x86_64 bit
  # Slackware and use its GRUB to boot the 32-bit system.
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-mtune=generic"
  EFI32_FLAGS=" --with-platform=efi --target=i386 --program-prefix= "
  EFI_FLAGS=" --with-platform=efi --target=x86_64 --program-prefix= "
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS=""
  LIBDIRSUFFIX=""
fi

# Don't use icecream:
PATH=$(echo $PATH | sed "s|/usr/libexec/icecc/bin||g" | tr -s : | sed "s/^://g" | sed "s/:$//g")

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.xz || exit 1
cd $PKGNAM-$VERSION || exit 1

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 {} \+

# Set default gfxterm font:
cat $CWD/grub.gfxterm.font.diff | patch -p1 --verbose || exit 1

# Fix alignment error with gcc8:
cat $CWD/0198-align-struct-efi_variable-better.patch | patch -p1 --verbose || exit 1

# Skip processing any files in /etc/grub.d/ that end in .new or .orig:
cat $CWD/0001-skip-new-and-orig-files-in-etc-grub.d.patch | patch -p1 --verbose || exit 1

# From Arch, add a couple more GRUB_COLOR options:
cat $CWD/0001-00_header-add-GRUB_COLOR_-variables.patch | patch -p1 --verbose || exit 1

# Also from Arch, support drop-in config bits in /etc/default/grub.d/:
cat $CWD/0003-support-dropins-for-default-configuration.patch | patch -p1 --verbose || exit 1

# Fix 2.12 release with upstream commit (won't compile otherwise):
cat $CWD/b835601c7639ed1890f2d3db91900a8506011a8e.patch | patch -p1 --verbose || exit 1

# For Slackware, opt-out of having our operating system renamed:
cat $CWD/10_linux.osname.patch | patch -p1 --verbose || exit 1

# Allow defining an initrd fallback name with the
# GRUB_INITRD_FALLBACK_NAME variable in /etc/default/grub.
# Commented out by default.
cat $CWD/0004-initrd_fallback_name.patch | patch -p1 --verbose || exit 1

# Support displaying only kernels that are files, only kernels that are
# symlinks, or both. This is set with the GRUB_DISPLAY_KERNEL_FILETYPES
# variable in /etc/default/grub:
cat $CWD/0005-GRUB_DISPLAY_KERNEL_FILETYPES.patch | patch -p1 --verbose || exit 1

# Add a warning to the README in /etc/grub.d/ so that users know that the
# standard files in here will be overwritten with every upgrade:
cat $CWD/0006-warn-grub.d-overwrites-docs.patch | patch -p1 --verbose || exit 1

# This double space at the top of the menu just looks bad.
cat $CWD/0333-dont-double-space-header.patch | patch -p1 --verbose || exit 1

# Revert a patch that breaks legacy boot. This was added to fix LLVM's lld, but
# it breaks linking with ld.bfd (while confusingly blaming the problem on ld.gold
# which we no longer have.) This also requires the autoreconf -vif below.
cat $CWD/0001-configure-Check-linker-for-image-base-support.patch | patch -R -p1 --verbose || exit 1

# Revert this one as well:
cat $CWD/0001-configure-Print-a-more-helpful-error-if-autoconf-arc.patch | patch -R -p1 --verbose || exit 1

# Still won't compile. Someday they'll remember how to cut a new release.
#touch grub-core/extra_deps.lst

# Regenerate build system to fix dependency on outdated automake:
autoreconf -vif

build_grub() {
  EFI_DO="$*"
  # Configure:
  CFLAGS="$SLKCFLAGS" \
  ./configure \
    --prefix=/usr \
    --libdir=/usr/lib${LIBDIRSUFFIX} \
    --sysconfdir=/etc \
    --localstatedir=/var \
    --infodir=/usr/info \
    --mandir=/usr/man \
    --disable-werror \
    --with-dejavufont=/usr/share/fonts/TTF/DejaVuSans.ttf \
    $STACKPROTECT \
    $EFI_DO || exit 1

  # Build and install:
  make clean || exit 1
  make $NUMJOBS || make || exit 1
  make install DESTDIR=$PKG || exit 1

  # Clear $EFI_DO :
  unset EFI_DO
}

# Build 32bit and 64bit efi targets if requested:
if [ -n "$EFI32_FLAGS" ]; then
  build_grub $EFI32_FLAGS || exit 1
fi
if [ -n "$EFI_FLAGS" ]; then
  build_grub $EFI_FLAGS || exit 1
fi
# Always end with regular build:
build_grub || exit 1

# Preserve files in /etc/grub.d/:
for file in $PKG/etc/grub.d/*_* ; do
  mv ${file} ${file}.new
done

# Add an update-grub script ala Ubuntu:
cp -a $CWD/update-grub $PKG/usr/sbin/update-grub
chown root:root $PKG/usr/sbin/update-grub
chmod 755 $PKG/usr/sbin/update-grub

# Since every other grub command is of the form "grub-{command}", add a symlink
# so that "grub-update" also works:
ln -sf update-grub $PKG/usr/sbin/grub-update

# 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
)

# Put bash-completion file in system directory:
mkdir -p $PKG/usr/share/bash-completion/completions/
mv $PKG/etc/bash_completion.d/grub \
   $PKG/usr/share/bash-completion/completions/grub
rmdir --parents $PKG/etc/bash_completion.d 2>/dev/null

# Install default options file:
mkdir -p $PKG/etc/default/grub.d
cat $CWD/etc.default.grub > $PKG/etc/default/grub.new
# Add a hint:
echo "Files in this directory must end in .cfg to be processed." > $PKG/etc/default/grub.d/README

# Create a directory for grub.cfg:
mkdir -p $PKG/boot/grub

# Add fonts, if found on the system:
FONT_SIZE=${FONT_SIZE:-20}
mkdir -p $PKG/boot/grub/fonts
if [ -r /usr/share/fonts/TTF/DejaVuSansMono.ttf ]; then
  $PKG/usr/bin/grub-mkfont -o $PKG/boot/grub/fonts/dejavusansmono.pf2 -av \
  -s $FONT_SIZE /usr/share/fonts/TTF/DejaVuSansMono.ttf
  $PKG/usr/bin/grub-mkfont -o $PKG/boot/grub/fonts/dejavusansmonobold.pf2 -abv \
  -s $FONT_SIZE /usr/share/fonts/TTF/DejaVuSansMono.ttf
fi
if [ -r /usr/share/fonts/TTF/Hack-Regular.ttf ]; then
  $PKG/usr/bin/grub-mkfont -o $PKG/boot/grub/fonts/hack.pf2 -av \
  -s $FONT_SIZE /usr/share/fonts/TTF/Hack-Regular.ttf
  $PKG/usr/bin/grub-mkfont -o $PKG/boot/grub/fonts/hackbold.pf2 -abv \
  -s $FONT_SIZE /usr/share/fonts/TTF/Hack-Regular.ttf
fi

# We put the fonts in /boot/grub but make symlinks in /usr/share/grub:
( cd $PKG/boot/grub/fonts
  for font in *.pf2 ; do
    ln -sf /boot/grub/fonts/$font $PKG/usr/share/grub/$font
  done
)

# Add a documentation directory:
mkdir -p $PKG/usr/doc/${PKGNAM}-$VERSION
cp -a \
  AUTHORS BUGS COPYING* INSTALL NEWS README* THANKS TODO \
  $PKG/usr/doc/${PKGNAM}-$VERSION

# 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

# Compress info files, if any:
if [ -d $PKG/usr/info ]; then
  ( cd $PKG/usr/info
    rm -f dir
    gzip -9 *
  )
fi

# If there's a ChangeLog, installing at least part of the recent history
# is useful, but don't let it get totally out of control:
if [ -r ChangeLog ]; then
  DOCSDIR=$(echo $PKG/usr/doc/${PKGNAM}-$VERSION)
  cat ChangeLog | head -n 1000 > $DOCSDIR/ChangeLog
  touch -r ChangeLog $DOCSDIR/ChangeLog
fi

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

cd $PKG
/sbin/makepkg -l y -c n --prepend $TMP/$PKGNAM-$PKGVER-$ARCH-$BUILD.txz