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# Maintainer: Piotr Gorski <lucjan.lucjanov@gmail.com> PGP-Key: BDB26C5A
# Contributor: shivik <> PGP-Key: 761E423C
# Contributor: Michael Duell <mail@akurei.me> PGP-Key: 6EE23EBE
# A special thanks to Steven Barrett for very important suggestions
# Contributor: Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>
# Contributor: Tobias Powalowski <tpowa@archlinux.org>
# Contributor: Thomas Baechler <thomas@archlinux.org>

### BUILD OPTIONS
# Set these variables to ANYTHING that is not null to enable them

### Tweak kernel options prior to a build via nconfig
_makenconfig=

### Tweak kernel options prior to a build via menuconfig
_makemenuconfig=

### Tweak kernel options prior to a build via xconfig
_makexconfig=

### Tweak kernel options prior to a build via gconfig
_makegconfig=

# NUMA is optimized for multi-socket motherboards.
# A single multi-core CPU actually runs slower with NUMA enabled.
# See, https://bugs.archlinux.org/task/31187
_NUMAdisable=y

# Compile ONLY used modules to VASTLYreduce the number of modules built
# and the build time.
#
# To keep track of which modules are needed for your specific system/hardware,
# give module_db script a try: https://aur.archlinux.org/packages/modprobed-db
# This PKGBUILD read the database kept if it exists
#
# More at this wiki page ---> https://wiki.archlinux.org/index.php/Modprobed-db
_localmodcfg=

# Use the current kernel's .config file
# Enabling this option will use the .config of the RUNNING kernel rather than
# the ARCH defaults. Useful when the package gets updated and you already went
# through the trouble of customizing your config options.  NOT recommended when
# a new kernel is released, but again, convenient for package bumps.
_use_current=

### Selecting the CPU scheduler
# ATTENTION - one of three predefined values should be selected!
# 'bmq' - select 'BitMap Queue CPU scheduler'
# 'pds' - select 'Priority and Deadline based Skip list multiple queue CPU scheduler'
# 'none' - select 'Completely Fair Scheduler'
_projectc='pds'

### Enable htmldocs (increases compile time)
_htmldocs_enable=

### Do not edit below this line unless you know what you're doing

# pkgname=('linux-lqx' 'linux-lqx-headers' 'linux-lqx-docs')
_major=5.15
_srcname=linux-${_major}
_lqxpatchname=liquorix-package
_lqxpatchrel=7
_lqxpatchver=${_lqxpatchname}-${_major}-${_lqxpatchrel}
pkgbase=linux-lqx
pkgver=5.15.6.lqx1
pkgrel=1
pkgdesc='Linux Liquorix'
url='https://liquorix.net/'
arch=(x86_64)
license=(GPL2)
makedepends=(bc kmod libelf cpio python pahole)
if [ -n "$_htmldocs_enable" ]; then
    makedepends+=(xmlto python-sphinx python-sphinx_rtd_theme graphviz imagemagick)
fi
options=('!strip')
#_lucjanpath="https://raw.githubusercontent.com/sirlucjan/kernel-patches/master/${_major}"
_lucjanpath="https://gitlab.com/sirlucjan/kernel-patches/raw/master/${_major}"

source=("https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/${_srcname}.tar.xz"
        "https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/${_srcname}.tar.sign"
        "https://github.com/damentz/${_lqxpatchname}/archive/${_major}-${_lqxpatchrel}.tar.gz")
validpgpkeys=(
    'ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linus Torvalds
    '647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman
)
sha512sums=('d25ad40b5bcd6a4c6042fd0fd84e196e7a58024734c3e9a484fd0d5d54a0c1d87db8a3c784eff55e43b6f021709dc685eb0efa18d2aec327e4f88a79f405705a'
            'SKIP'
            'c78d8a7e9f2cf3e12118f0ec9d4b710a521d8741a9ce5fe72c146d11c07efd0e6ddee67dc3ebe0b63f897c5f03211cb1cae86f05d082944d109c2d873bd3f272')



export KBUILD_BUILD_HOST=archlinux
export KBUILD_BUILD_USER=$pkgbase
export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"

prepare() {
    cd $_srcname

    ### Set package version variables
        _abiname="$(cat ${srcdir}/${_lqxpatchver}/linux-liquorix/debian/config/defines | grep 'abiname:' | sed -r 's/abiname:\s*//')"
        _minor="$(echo "$_abiname" | cut -f1 -d .)"
        _patchrel="$(echo "$_abiname" | cut -f2 -d .)"

    ### Add Liquorix patches
        local _patchrx='^zen/v\d+\.\d+\.\d+-lqx\d+.patch$'
        local _patchfolder="${srcdir}/${_lqxpatchver}/linux-liquorix/debian/patches"
        local _patchpath="$(grep -P "$_patchrx" "$_patchfolder/series")"
        echo "Patching sources with ${_patchpath#*/}"
        patch -Np1 -i "$_patchfolder/$_patchpath"

    ### Setting version
        echo "Setting version..."
        scripts/setlocalversion --save-scmversion
        echo "-$pkgrel" > localversion.10-pkgrel
        echo "${pkgbase#linux}" > localversion.20-pkgname

    ### Patching sources
        local src
        for src in "${source[@]}"; do
            src="${src%%::*}"
            src="${src##*/}"
            [[ $src = *.patch ]] || continue
        echo "Applying patch $src..."
        patch -Np1 < "../$src"
        done

    ### Setting config
        echo "Setting config..."
        cat ${srcdir}/${_lqxpatchver}/linux-liquorix/debian/config/kernelarch-x86/config-arch-64 >./.config
        make olddefconfig
        diff -u ${srcdir}/${_lqxpatchver}/linux-liquorix/debian/config/kernelarch-x86/config-arch-64 .config || :

    ### Prepared version
        make -s kernelrelease > version
        echo "Prepared $pkgbase version $(<version)"

    ### Optionally use running kernel's config
	# code originally by nous; http://aur.archlinux.org/packages.php?ID=40191
	if [ -n "$_use_current" ]; then
		if [[ -s /proc/config.gz ]]; then
			echo "Extracting config from /proc/config.gz..."
			# modprobe configs
			zcat /proc/config.gz > ./.config
		else
			warning "Your kernel was not compiled with IKCONFIG_PROC!"
			warning "You cannot read the current config!"
			warning "Aborting!"
			exit
		fi
	fi

    ### Selecting the CPU scheduler
	if [ "$_projectc" = "bmq" ]; then
		echo "Selecting BMQ CPU scheduler..."
		scripts/config --enable CONFIG_SCHED_BMQ
		scripts/config --disable CONFIG_SCHED_PDS
	elif [ "$_projectc" = "pds" ]; then
		echo "Selecting PDS CPU scheduler..."
		scripts/config --disable CONFIG_SCHED_BMQ
		scripts/config --enable CONFIG_SCHED_PDS
	elif [ "$_projectc" = "none" ]; then
		echo "Selecting Completely Fair Scheduler..."
		scripts/config --disable CONFIG_SCHED_ALT
	else
		if [ -n "$_projectc" ]; then
			error "The value $_projectc is invalid. Choose the correct one again."
		else
			error "The value is empty. Choose the correct one again."
		fi
		error "Selecting the CPU scheduler failed!"
		exit
	fi

    ### Optionally disable NUMA for 64-bit kernels only
        # (x86 kernels do not support NUMA)
        if [ -n "$_NUMAdisable" ]; then
            echo "Disabling NUMA from kernel config..."
            scripts/config --disable CONFIG_NUMA
        fi

    ### Optionally load needed modules for the make localmodconfig
        # See https://aur.archlinux.org/packages/modprobed-db
        if [ -n "$_localmodcfg" ]; then
            if [ -f $HOME/.config/modprobed.db ]; then
            echo "Running Steven Rostedt's make localmodconfig now"
            make LSMOD=$HOME/.config/modprobed.db localmodconfig
        else
            echo "No modprobed.db data found"
            exit
            fi
        fi

    ### Running make nconfig
	[[ -z "$_makenconfig" ]] ||  make nconfig

    ### Running make menuconfig
	[[ -z "$_makemenuconfig" ]] || make menuconfig

    ### Running make xconfig
	[[ -z "$_makexconfig" ]] || make xconfig

    ### Running make gconfig
	[[ -z "$_makegconfig" ]] || make gconfig

    ### Save configuration for later reuse
	cat .config > "${startdir}/config.last"
}

build() {
  cd $_srcname

  make all
  if [ -n "$_htmldocs_enable" ]; then
    make htmldocs
  fi
}

_package() {
    pkgdesc="The $pkgdesc kernel and modules"
    depends=(coreutils kmod initramfs)
    optdepends=('crda: to set the correct wireless channels of your country'
                'linux-firmware: firmware images needed for some devices'
                'sof-firmware: firmware images needed for Sound Open Firmware capable devices')
    provides=(VIRTUALBOX-GUEST-MODULES WIREGUARD-MODULE)

  cd $_srcname
  local kernver="$(<version)"
  local modulesdir="$pkgdir/usr/lib/modules/$kernver"

  echo "Installing boot image..."
  # systemd expects to find the kernel here to allow hibernation
  # https://github.com/systemd/systemd/commit/edda44605f06a41fb86b7ab8128dcf99161d2344
  install -Dm644 "$(make -s image_name)" "$modulesdir/vmlinuz"

  # Used by mkinitcpio to name the kernel
  echo "$pkgbase" | install -Dm644 /dev/stdin "$modulesdir/pkgbase"

  echo "Installing modules..."
  make INSTALL_MOD_PATH="$pkgdir/usr" INSTALL_MOD_STRIP=1 modules_install

  # remove build and source links
  rm "$modulesdir"/{source,build}
}

_package-headers() {
    pkgdesc="Headers and scripts for building modules for the $pkgdesc kernel"
    depends=('linux-lqx' 'pahole')

  cd $_srcname
  local builddir="$pkgdir/usr/lib/modules/$(<version)/build"

  echo "Installing build files..."
  install -Dt "$builddir" -m644 .config Makefile Module.symvers System.map \
    localversion.* version vmlinux
  install -Dt "$builddir/kernel" -m644 kernel/Makefile
  install -Dt "$builddir/arch/x86" -m644 arch/x86/Makefile
  cp -t "$builddir" -a scripts

  # add objtool for external module building and enabled VALIDATION_STACK option
  install -Dt "$builddir/tools/objtool" tools/objtool/objtool

  # add xfs and shmem for aufs building
  mkdir -p "$builddir"/{fs/xfs,mm}

  echo "Installing headers..."
  cp -t "$builddir" -a include
  cp -t "$builddir/arch/x86" -a arch/x86/include
  install -Dt "$builddir/arch/x86/kernel" -m644 arch/x86/kernel/asm-offsets.s

  install -Dt "$builddir/drivers/md" -m644 drivers/md/*.h
  install -Dt "$builddir/net/mac80211" -m644 net/mac80211/*.h

  # https://bugs.archlinux.org/task/13146
  install -Dt "$builddir/drivers/media/i2c" -m644 drivers/media/i2c/msp3400-driver.h

  # https://bugs.archlinux.org/task/20402
  install -Dt "$builddir/drivers/media/usb/dvb-usb" -m644 drivers/media/usb/dvb-usb/*.h
  install -Dt "$builddir/drivers/media/dvb-frontends" -m644 drivers/media/dvb-frontends/*.h
  install -Dt "$builddir/drivers/media/tuners" -m644 drivers/media/tuners/*.h

  # https://bugs.archlinux.org/task/71392
  install -Dt "$builddir/drivers/iio/common/hid-sensors" -m644 drivers/iio/common/hid-sensors/*.h

  echo "Installing KConfig files..."
  find . -name 'Kconfig*' -exec install -Dm644 {} "$builddir/{}" \;

  echo "Removing unneeded architectures..."
  local arch
  for arch in "$builddir"/arch/*/; do
    [[ $arch = */x86/ ]] && continue
    echo "Removing $(basename "$arch")"
    rm -r "$arch"
  done

  echo "Removing documentation..."
  rm -r "$builddir/Documentation"

  echo "Removing broken symlinks..."
  find -L "$builddir" -type l -printf 'Removing %P\n' -delete

  echo "Removing loose objects..."
  find "$builddir" -type f -name '*.o' -printf 'Removing %P\n' -delete

  echo "Stripping build tools..."
  local file
  while read -rd '' file; do
    case "$(file -bi "$file")" in
      application/x-sharedlib\;*)      # Libraries (.so)
        strip -v $STRIP_SHARED "$file" ;;
      application/x-archive\;*)        # Libraries (.a)
        strip -v $STRIP_STATIC "$file" ;;
      application/x-executable\;*)     # Binaries
        strip -v $STRIP_BINARIES "$file" ;;
      application/x-pie-executable\;*) # Relocatable binaries
        strip -v $STRIP_SHARED "$file" ;;
    esac
  done < <(find "$builddir" -type f -perm -u+x ! -name vmlinux -print0)

  echo "Stripping vmlinux..."
  strip -v $STRIP_STATIC "$builddir/vmlinux"

  echo "Adding symlink..."
  mkdir -p "$pkgdir/usr/src"
  ln -sr "$builddir" "$pkgdir/usr/src/$pkgbase"
}

_package-docs() {
    pkgdesc="Documentation for the $pkgdesc kernel"
    depends=('linux-lqx')

  cd $_srcname
  local builddir="$pkgdir/usr/lib/modules/$(<version)/build"

  echo "Installing documentation..."
  local src dst
  while read -rd '' src; do
    dst="${src#Documentation/}"
    dst="$builddir/Documentation/${dst#output/}"
    install -Dm644 "$src" "$dst"
  done < <(find Documentation -name '.*' -prune -o ! -type d -print0)

  echo "Adding symlink..."
  mkdir -p "$pkgdir/usr/share/doc"
  ln -sr "$builddir/Documentation" "$pkgdir/usr/share/doc/$pkgbase"
}

pkgname=("$pkgbase" "$pkgbase-headers" "$pkgbase-docs")
for _p in "${pkgname[@]}"; do
  eval "package_$_p() {
    $(declare -f "_package${_p#$pkgbase}")
    _package${_p#$pkgbase}
  }"
done

# vim:set ts=8 sts=2 sw=2 et: