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# Maintainer: Michael Tindal <mj.tindal@gmail.com>
# Contributor: Dan Ziemba <zman0900@gmail.com>
# Contributor: Mark Weiman <markzz@archlinux.net>

pkgbase=linux-nc
_srcname=linux-5.4
pkgver=5.4.6
pkgrel=1
arch=('x86_64')
url="https://www.kernel.org/"
license=('GPL2')
makedepends=('xmlto' 'kmod-nc' 'inetutils' 'bc' 'libelf')
options=('!strip')
source=(
  https://cdn.kernel.org/pub/linux/kernel/v5.x/${_srcname}.tar.{xz,sign}
  https://cdn.kernel.org/pub/linux/kernel/v5.x/patch-${pkgver}.xz
  config         # the main kernel config file
  60-linux.hook  # pacman hook for depmod
  90-linux.hook  # pacman hook for initramfs regeneration
  linux.preset   # standard config files for mkinitcpio ramdisk
  # patches for pci passthrough
  add-acs-overrides.patch
  0007-v5.4-fsync.patch
  0008-add-zstd-kernel-compression.patch
  0009-add-zstd-compressed-modules.patch
)
validpgpkeys=(
  'ABAF11C65A2970B130ABE3C479BE3E4300411886'  # Linus Torvalds
  '647F28654894E3BD457199BE38DBBDC86092693E'  # Greg Kroah-Hartmanj
)
sha256sums=('bf338980b1670bca287f9994b7441c2361907635879169c64ae78364efc5f491'
            'SKIP'
            '80853920a753762e058e35b754d3e0d16ec2fb485dfb84cc40fbdba383a8da17'
            '9506b290fe5ec403f05a020e65e5b2540c11bf20b1a8ceb5bb8ca872bf3c464b'
            'ae2e95db94ef7176207c690224169594d49445e04249d2499e9d2fbc117a0b21'
            '8f407ad5ff6eff106562ba001c36a281134ac9aa468a596aea660a4fe1fd60b5'
            '99d0102c8065793096b8ea2ccc01c41fa3dcb96855f9f6f2c583b2372208c6f9'
            '90917e09bb06fbed6853efe9e52f8c2ba4066fca44accdf7608222212561104a'
            '2d9260b80b43bbd605cf420d6bd53aa7262103dfd77196ba590ece5600b6dc0d'
            '0b7349ff2ee3828a70681f1619d5e1b3c69b44f503bfc5a926c6d0a9e5732f8d'
            'a27ad8905df9d886a829b4ae62c62a8b20beb5829ea4af45692ffe8c5d0d94fd')

_kernelname=${pkgbase#linux}
: ${_kernelname:=-ARCH}

prepare() {
  cd ${_srcname}

  # add upstream patch
  patch -p1 -i ../patch-${pkgver}

  # add latest fixes from stable queue, if needed
#  http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git

  # patches for vga arbiter fix in intel systems
#  patch -p1 -i "${srcdir}/i915-vga-arbiter.patch"

  # Overrides for missing acs capabilities
  patch -p1 -i "${srcdir}/add-acs-overrides.patch"

  # FSync
  patch -p1 -i "${srcdir}/0007-v5.4-fsync.patch"

  # ZSTD kernel image
  patch -p1 -i "${srcdir}/0008-add-zstd-kernel-compression.patch"

  # ZSTD modules
  patch -p1 -i "${srcdir}/0009-add-zstd-compressed-modules.patch"

  cat ../config - >.config <<END
CONFIG_LOCALVERSION="${_kernelname}"
CONFIG_LOCALVERSION_AUTO=n
END

  # set extraversion to pkgrel and empty localversion
  sed -e "/^EXTRAVERSION =/s/=.*/= -${pkgrel}/" \
      -e "/^EXTRAVERSION =/aLOCALVERSION =" \
      -i Makefile

  # don't run depmod on 'make install'. We'll do this ourselves in packaging
  sed -i '2iexit 0' scripts/depmod.sh

  # get kernel version
  make prepare

  # load configuration
  # Configure the kernel. Replace the line below with one of your choice.
  #make menuconfig # CLI menu for configuration
  #make nconfig # new CLI menu for configuration
  #make xconfig # X-based configuration
  # ... or manually edit .config

  #make LSMOD=$HOME/.config/modprobed.db localmodconfig

  # rewrite configuration
  yes "" | make config >/dev/null
}

build() {
  cd ${_srcname}

  make bzImage modules
}

_package() {
  pkgdesc="The ${pkgbase/linux/Linux} kernel and modules"
  [ "${pkgbase}" = "linux" ] && groups=('base')
  depends=('coreutils' 'linux-firmware' 'kmod-nc' 'mkinitcpio>=0.7')
  optdepends=('crda: to set the correct wireless channels of your country')
  backup=("etc/mkinitcpio.d/${pkgbase}.preset")
  install=linux.install

  cd ${_srcname}

  # get kernel version
  _kernver="$(make kernelrelease)"
  _basekernel=${_kernver%%-*}
  _basekernel=${_basekernel%.*}

  mkdir -p "${pkgdir}"/{boot,usr/lib/modules}
  make INSTALL_MOD_PATH="${pkgdir}/usr" modules_install
  cp arch/x86/boot/bzImage "${pkgdir}/boot/vmlinuz-${pkgbase}"

  # make room for external modules
  local _extramodules="extramodules-${_basekernel}${_kernelname}"
  ln -s "../${_extramodules}" "${pkgdir}/usr/lib/modules/${_kernver}/extramodules"

  # add real version for building modules and running depmod from hook
  echo "${_kernver}" |
    install -Dm644 /dev/stdin "${pkgdir}/usr/lib/modules/${_extramodules}/version"

  # remove build and source links
  rm "${pkgdir}"/usr/lib/modules/${_kernver}/{source,build}

  # now we call depmod...
  depmod -b "${pkgdir}/usr" -F System.map "${_kernver}"

  # add vmlinux
  install -Dt "${pkgdir}/usr/lib/modules/${_kernver}/build" -m644 vmlinux

  # sed expression for following substitutions
  local _subst="
    s|%PKGBASE%|${pkgbase}|g
    s|%KERNVER%|${_kernver}|g
    s|%EXTRAMODULES%|${_extramodules}|g
  "

  # hack to allow specifying an initially nonexisting install file
  sed "${_subst}" "${startdir}/${install}" > "${startdir}/${install}.pkg"
  true && install=${install}.pkg

  # install mkinitcpio preset file
  sed "${_subst}" "${startdir}/linux.preset" |
    install -Dm644 /dev/stdin "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"

  # install pacman hooks
  sed "${_subst}" "${startdir}/60-linux.hook" |
    install -Dm644 /dev/stdin "${pkgdir}/usr/share/libalpm/hooks/60-${pkgbase}.hook"
  sed "${_subst}" "${startdir}/90-linux.hook" |
    install -Dm644 /dev/stdin "${pkgdir}/usr/share/libalpm/hooks/90-${pkgbase}.hook"
}

_package-headers() {
  pkgdesc="Header files and scripts for building modules for ${pkgbase/linux/Linux} kernel"

  cd ${_srcname}
  local _builddir="${pkgdir}/usr/lib/modules/${_kernver}/build"

  install -Dt "${_builddir}" -m644 Makefile .config Module.symvers
  install -Dt "${_builddir}/kernel" -m644 kernel/Makefile

  mkdir "${_builddir}/.tmp_versions"

  cp -t "${_builddir}" -a include scripts

  install -Dt "${_builddir}/arch/x86" -m644 arch/x86/Makefile
  install -Dt "${_builddir}/arch/x86/kernel" -m644 arch/x86/kernel/asm-offsets.s

  cp -t "${_builddir}/arch/x86" -a arch/x86/include

  install -Dt "${_builddir}/drivers/md" -m644 drivers/md/*.h
  install -Dt "${_builddir}/net/mac80211" -m644 net/mac80211/*.h

  # http://bugs.archlinux.org/task/13146
  install -Dt "${_builddir}/drivers/media/i2c" -m644 drivers/media/i2c/msp3400-driver.h

  # http://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

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

  # copy in Kconfig files
  find . -name Kconfig\* -exec install -Dm644 {} "${_builddir}/{}" \;

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

  # remove unneeded architectures
  local _arch
  for _arch in "${_builddir}"/arch/*/; do
    [[ ${_arch} == */x86/ ]] && continue
    rm -r "${_arch}"
  done

  # remove files already in linux-docs package
  rm -r "${_builddir}/Documentation"

  # remove now broken symlinks
  find -L "${_builddir}" -type l -printf 'Removing %P\n' -delete

  # Fix permissions
  chmod -R u=rwX,go=rX "${_builddir}"

  # strip scripts directory
  local _binary _strip
  while read -rd '' _binary; do
    case "$(file -bi "${_binary}")" in
      *application/x-sharedlib*)  _strip="${STRIP_SHARED}"   ;; # Libraries (.so)
      *application/x-archive*)    _strip="${STRIP_STATIC}"   ;; # Libraries (.a)
      *application/x-executable*) _strip="${STRIP_BINARIES}" ;; # Binaries
      *) continue ;;
    esac
    /usr/bin/strip ${_strip} "${_binary}"
  done < <(find "${_builddir}/scripts" -type f -perm -u+w -print0 2>/dev/null)
}

_package-docs() {
  pkgdesc="Kernel hackers manual - HTML documentation that comes with the ${pkgbase/linux/Linux} kernel"

  cd ${_srcname}
  local _builddir="${pkgdir}/usr/lib/modules/${_kernver}/build"

  mkdir -p "${_builddir}"
  cp -t "${_builddir}" -a Documentation

  # Fix permissions
  chmod -R u=rwX,go=rX "${_builddir}"
}

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: