# AUR/linux-lts-tomoyo PKGBUILD
# Maintainer: TH Campbell (dysphoria) <thcampbell (at) protonmail (dot) com>

# core/linux-lts PKGBUILD
# Maintainer: Andreas Radke <andyrtr@archlinux.org>

pkgbase=linux-lts-tomoyo
_srcname=linux-4.19
pkgver=4.19.58
pkgrel=1
arch=('x86_64')
url="https://www.kernel.org/"
license=('GPL2')
makedepends=('xmlto' 'kmod' 'inetutils' 'bc' 'libelf')
options=('!strip')
source=(
        https://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.{xz,sign}
        https://www.kernel.org/pub/linux/kernel/v4.x/patch-${pkgver}.xz
        'config'         # the main kernel config file
        '60-linux.hook'  # pacman hook for depmod
        '90-linux.hook'  # pacman hook for initramfs regeneration
        'linux-lts.preset'   # standard config files for mkinitcpio ramdisk
        '0001-add-sysctl-to-disallow-unprivileged-CLONE_NEWUSER-by.patch'
        '0002-ZEN-Add-CONFIG-for-unprivileged_userns_clone.patch'
        )
validpgpkeys=(
              'ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linus Torvalds
              '647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman
              )
# https://www.kernel.org/pub/linux/kernel/v4.x/sha256sums.asc
sha256sums=('0c68f5655528aed4f99dae71a5b259edc93239fa899e2df79c055275c21749a1'
            'SKIP'
            '018584229e0522aa94cb7af7b7f0775cf42ae3873a8d4cbc8715d807719bfad5'
            'af7e7687a91b210e803697ef9509faaf3b7955a6094350212944a598b29f2c58'
            'ae2e95db94ef7176207c690224169594d49445e04249d2499e9d2fbc117a0b21'
            '75f99f5239e03238f88d1a834c50043ec32b1dc568f2cc291b07d04718483919'
            'ad6344badc91ad0630caacde83f7f9b97276f80d26a20619a87952be65492c65'
            'bc3dab5594735fb56bdb39c1630a470fd2e65fcf0d81a5db31bab3b91944225d'
            '67aed9742e4281df6f0bd18dc936ae79319fee3763737f158c0e87a6948d100d')

_kernelname=${pkgbase#linux}

prepare() {
  cd ${_srcname}

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

  # allow disabling USER_NS via sysctl
  patch -Np1 -i ../0001-add-sysctl-to-disallow-unprivileged-CLONE_NEWUSER-by.patch
  patch -Np1 -i ../0002-ZEN-Add-CONFIG-for-unprivileged_userns_clone.patch

  cp -Tf ../config .config

  # Enable TOMOYO Linux
  msg2 "Enabling TOMOYO Linux..."
  sed -i -e 's,# CONFIG_SECURITY_TOMOYO is not set,CONFIG_SECURITY_TOMOYO=y\nCONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY=2048\nCONFIG_SECURITY_TOMYO_MAX_AUDIT_LOG=1024\n# CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER is not set\nCONFIG_SECURITY_TOMOYO_POLICY_LOADER="/sbin/tomoyo-init"\nCONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER="/usr/lib/systemd/systemd",' \
      -i -e 's/CONFIG_DEFAULT_SECURITY_DAC=y/CONFIG_DEFAULT_SECURITY_TOMOYO=y/' \
      -i -e '/CONFIG_DEFAULT_SECURITY=""/ s,"","tomoyo",' ./.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

  # 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

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

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

build() {
  cd ${_srcname}

  make ${MAKEFLAGS} LOCALVERSION= bzImage modules
}

_package() {
  pkgdesc="The Linux-lts kernel with TOMOYO Linux configuration"
  [ "${pkgbase}" = "linux" ] && groups=('base')
  depends=('coreutils' 'linux-firmware' 'kmod' 'mkinitcpio>=0.7')
  optdepends=(
             'crda: to set the correct wireless channels of your country'
             'tomoyo-tools-25: the TOMOYO Linux 2.5.x userspace tools'
             )
  provides=("${pkgbase}=${pkgver}")
  backup=("etc/mkinitcpio.d/${pkgbase}.preset")
  install=linux-lts.install

  cd ${_srcname}

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

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

  # systemd expects to find the kernel here to allow hibernation
  # https://github.com/systemd/systemd/commit/edda44605f06a41fb86b7ab8128dcf99161d2344
  ln -sr "${pkgdir}/boot/vmlinuz-${pkgbase}" "${pkgdir}/usr/lib/modules/${_kernver}/vmlinuz"

  # make room for external modules
  local _extramodules="extramodules-${_basekernel}${_kernelname:--tomoyo}"
  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 "${_subst}" ../linux-lts.preset |
    install -Dm644 /dev/stdin "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"

  # install pacman hooks
  sed "${_subst}" ../60-linux.hook |
    install -Dm644 /dev/stdin "${pkgdir}/usr/share/libalpm/hooks/60-${pkgbase}.hook"
  sed "${_subst}" ../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 ${pkgbase/linux/Linux} kernel"
  provides=("${pkgbase}-headers=${pkgver}")

  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 ${pkgbase/linux/Linux} kernel"
  provides=("${pkgbase}-docs=${pkgver}")

  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