# Maintainer: Chris Severance aur.severach aATt spamgourmet dott com
# Contributor: Andreas Radke <andyrtr@archlinux.org>

set -u
pkgbase="linux-lts414"
pkgver="4.14.336"
_srcname="linux-${pkgver%.*}"
pkgrel='1'
arch=('x86_64')
url="https://www.kernel.org/"
license=('GPL2')
makedepends=('xmlto' 'kmod' 'inetutils' 'bc' 'libelf')
options=('!strip')
_verwatch=('https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/' '.*"patch-\(4\.14\.[0-9]\+\)\.xz.*' 'f')
source=(
  "https://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.xz"
  "https://www.kernel.org/pub/linux/kernel/v4.x/patch-${pkgver}.xz"
  'config'         # the main kernel config file
  # disable USER_NS for non-root users by default
  '0001-add-sysctl-to-disallow-unprivileged-CLONE_NEWUSER-by.patch'
  # https://bugs.archlinux.org/task/56711
  '0003-Revert-drm-i915-edp-Allow-alternate-fixed-mode-for-e.patch'
  # https://github.com/NixOS/nixpkgs/pull/61076
  '0004-export_kernel_fpu_functions.patch'
  # add modules.builtin.modinfo
  '0005-898490c010b.patch' # https://pkgbuild.com/~bgyorgy/files/898490c010b.patch
)
if ! :; then
  source+=("${source[0]/.xz/.sign}")
  source+=("${source[1]/.xz/.sign}") # patch>=4.14.59 are not signed
fi
validpgpkeys=(
  'ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linus Torvalds <torvalds@linux-foundation.org>
  '647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman (Linux kernel stable release signing key) <greg@kroah.com>
)
# https://www.kernel.org/pub/linux/kernel/v4.x/sha256sums.asc
md5sums=('bacdb9ffdcd922aa069a5e1520160e24'
         'c7ce7c564746338afcd1e4c8d8e52e89'
         'b482d22d72ba46de5db13584c889ab42'
         '53523555d234de3b2fde749096ba9948'
         '95204750f94a5f6d2d19e021736265d5'
         'f7d76cdef5cf4ac6a49115fc4f1f35d5'
         'b7e3c03892c1c45aa19e11aff82b388c')
sha256sums=('f81d59477e90a130857ce18dc02f4fbe5725854911db1e7ba770c7cd350f96a7'
            'c577893e1bbb8f5c36b7207f6d7f3165cd64c069d977d1b720c10e5917a821e7'
            '1d1992babef5f1c35911dd6b3818b3684628fc21b97bc9975791892bccb50b20'
            '36b1118c8dedadc4851150ddd4eb07b1c58ac5bbf3022cc2501a27c2b476da98'
            'b6c56ff2dffebe164941ac3428351e158c9c059e884057ecfc215eeea12e76eb'
            'caba7945805b1ade42e42d2f981ccdd8791c76f39166212f7970a78057582474'
            '8efff55ae9dd776ff4ac109e736e8040858f441ae1900435bdeb9f366a53d68f')

_kernelname=${pkgbase#linux}

# CFLAGS CXXFLAGS are not used at all.
# LDFLAGS only works on the make command line. It is not used from the environment.
_makeopts=(
  #CC='gcc-5' CXX='g++-5' HOSTCC='gcc-5' HOSTCXX='g++-5' # LD='ld.gold'
  #CC='gcc-6' CXX='g++-6' HOSTCC='gcc-6' HOSTCXX='g++-6'
  #LDFLAGS='-z max-page-size=0x200000' # http://lists.gnu.org/archive/html/bug-binutils/2018-03/msg00193.html
)
#makedepends+=('gcc5')

prepare() {
  set -u
  cd "${_srcname}"

  # add upstream patch
  test -s "${srcdir}/patch-${pkgver}" || (cd "${srcdir}"; xz -dkf "${srcdir}/patch-${pkgver}.xz") # temporary fix for file-5.40 https://bugs.archlinux.org/task/70261
  patch -Nup1 -i "${srcdir}/patch-${pkgver}"
  set +u; msg2 "Complete: patch-${pkgver}"; set -u
  chmod +x tools/objtool/sync-check.sh  # GNU patch doesn't support git-style file mode

  # security patches

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

  local _f
  for _f in "${source[@]}"; do
    _f="${_f%%::*}"
    _f="${_f##*/}"
    case "${_f}" in
    *.patch)
      set +u; msg2 "Patch ${_f}"; set +u
      patch -Nup1 -i "${srcdir}/${_f}"
      ;;
    esac
  done

  # Local or private patches
  shopt -s nullglob
  local _lpatch
  for _lpatch in "${startdir}"/*.localpatch; do
    set +u; msg2 "Local patch: ${_lpatch##*/}"; set -u
    patch -Nup1 -i "${_lpatch}"
  done
  unset _lpatch
  shopt -u nullglob

  declare -A _config=([x86_64]='config')
  cat "${srcdir}/${_config[${CARCH}]}" > './.config'
  if [ "${_kernelname}" != "" ]; then
    sed -i "s|CONFIG_LOCALVERSION=.*|CONFIG_LOCALVERSION=\"${_kernelname}\"|g" ./.config
    sed -i "s|CONFIG_LOCALVERSION_AUTO=.*|CONFIG_LOCALVERSION_AUTO=n|" ./.config
  fi
  cp './.config' "${srcdir}/config.cmp"
  rm -f "${startdir}/${_config[${CARCH}]}.new"

  # set extraversion to pkgrel
  sed -ri "s|^(EXTRAVERSION =).*|\1 -${pkgrel}|" Makefile

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

  set +u; msg2 'get kernel version'; set +u
  set -x
  make -s -j1 prepare "${_makeopts[@]}"
  set +x

  if ! diff -pNau5 "${srcdir}/config.cmp" './.config'; then
    ln -s "${PWD}/.config" "${startdir}/${_config[${CARCH}]}.new"
    rm "${srcdir}/config.cmp"
    set +u
    echo 'Some changes were made. Please merge for automation.'
    false
  else
    rm "${srcdir}/config.cmp"
  fi

  # 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
  #make oldconfig # using old config from previous kernel version
  # ... or manually edit .config

  set +u; msg2 'rewrite configuration'; set +u
  set -x
  yes "" | make -j1 config "${_makeopts[@]}" >/dev/null
  set +x
  set +u
}

build() {
  set -u
  cd "${srcdir}/${_srcname}"

  local _mflags=()
  local _nproc="$(nproc)"; _nproc=$((_nproc>8?8:_nproc))
  if [ -z "${MAKEFLAGS:=}" ] || [ "${MAKEFLAGS//-j/}" = "${MAKEFLAGS}" ]; then
    _mflags+=('-j' "${_nproc}")
  fi

  rm -f vmlinux vmlinux.o # force relink, for debugging binutils 2.31.1

  set -x
  nice make -s "${_makeopts[@]}" "${_mflags[@]}" ${MAKEFLAGS} LOCALVERSION= bzImage modules
  set +x
  set +u
}

_package() {
  set -u
  pkgdesc="The ${pkgbase/linux/Linux} kernel and modules"
  #[ "${pkgbase}" = "linux" ] && groups=('base')
  depends=('coreutils' 'linux-firmware' 'kmod' 'initramfs')
  optdepends=('crda: to set the correct wireless channels of your country')
  optdepends+=('linux-firmware-uncompressed: hardware support')
  #provides=("linux=${pkgver}") # not permitted by order of Arch TU

  cd "${_srcname}"

  # get kernel version
  _kernver="$(make -j1 "${_makeopts[@]}" LOCALVERSION= kernelrelease)"
  _basekernel=${_kernver%%-*}
  _basekernel=${_basekernel%.*}

  mkdir -p "${pkgdir}"/{boot,usr/lib/modules}
  make -j1 "${_makeopts[@]}" LOCALVERSION= INSTALL_MOD_PATH="${pkgdir}/usr" modules_install

  # systemd expects to find the kernel here to allow hibernation
  # https://github.com/systemd/systemd/commit/edda44605f06a41fb86b7ab8128dcf99161d2344
  cp arch/x86/boot/bzImage "${pkgdir}/usr/lib/modules/${_kernver}/vmlinuz"

  # Used by mkinitcpio to name the kernel
  echo "$pkgbase" | install -Dm644 /dev/stdin "${pkgdir}/usr/lib/modules/${_kernver}/pkgbase"

  # make room for external modules
  local _extramodules="extramodules-${_basekernel}${_kernelname:--lts}"
  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
  "
  set +u
}

_package-headers() {
  set -u
  pkgdesc="Header files and scripts for building modules for ${pkgbase/linux/Linux} kernel"
  #provides=("linux-headers=${pkgver}") # not permitted by order of Arch TU

  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/9912
  install -Dt "${_builddir}/drivers/media/dvb-core" -m644 drivers/media/dvb-core/*.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)
  set +u
}

_package-docs() {
  set -u
  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}"
  set +u
}

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

set +u