# Maintainer: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
# Feel free to push modifications or take over maintainership

# Based on the linux-libre package

_replacesarchkernel=('linux%') # '%' gets replaced with kernel suffix
_replacesoldkernels=() # '%' gets replaced with kernel suffix
_replacesoldmodules=() # '%' gets replaced with kernel suffix

pkgbase=linux-libre-64
pkgver=5.7.2
pkgrel=1
pkgdesc='64bit Linux-libre for Parabola $CARCH'
rcnver=5.7.2
rcnrel=armv7-x9
url='https://linux-libre.fsfla.org/'
arch=(armv7h i686 )
license=(GPL2)
conflicts_armv7h=('linux-libre-aarch64')
replaces_armv7h=('linux-libre-aarch64')
conflicts_i686=('linux-libre-x86_64')
replaces_i686=('linux-libre-x86_64')
makedepends=(
  bc kmod libelf pahole
  xmlto python-sphinx python-sphinx_rtd_theme graphviz imagemagick
)
makedepends_i686+=('x86_64-pc-linux-gnu-gcc')
makedepends_armv7h=(uboot-tools vboot-utils dtc) # required by linux-libre-chromebook
makedepends_armv7h+=('aarch64-linux-gnu-gcc-initial')
options=('!strip')
_srcname=linux-5.7
source=(
  "https://linux-libre.fsfla.org/pub/linux-libre/releases/${_srcname##*-}-gnu/linux-libre-${_srcname##*-}-gnu.tar.xz"{,.sign}
  "https://linux-libre.fsfla.org/pub/linux-libre/releases/$pkgver-gnu/patch-${_srcname##*-}-gnu-$pkgver-gnu.xz"{,.sign}
  "https://repo.parabola.nu/other/linux-libre/logos/logo_linux_"{clut224.ppm,vga16.ppm,mono.pbm}{,.sig}
  config.i686 config.x86_64 config.armv7h    # the main kernel config files
  linux-armv7h.preset                        # armv7h preset file for mkinitcpio ramdisk
  "kernel"{.its,.keyblock,_data_key.vbprivk} # files for signing Chromebooks kernels

  # maintain the TTY over USB disconnects
  # http://www.coreboot.org/EHCI_Gadget_Debug
  0001-usb-serial-gadget-no-TTY-hangup-on-USB-disconnect-WI.patch
  # fix Atmel maXTouch touchscreen support
  # https://labs.parabola.nu/issues/877
  # http://www.fsfla.org/pipermail/linux-libre/2015-November/003202.html
  0002-fix-Atmel-maXTouch-touchscreen-support.patch
  # extracted patches from Arch Linux kernel sources
  0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
  sphinx-workaround.patch
)
source_armv7h=(
  # RCN patch (CM3 firmware deblobbed and bloatware removed)
  "https://repo.parabola.nu/other/rcn-libre/patches/$rcnver/rcn-libre-$rcnver-$rcnrel.patch"{,.sig}
  # Arch Linux ARM patches
  0001-ARM-atags-add-support-for-Marvell-s-u-boot.patch
  0002-ARM-atags-fdt-retrieve-MAC-addresses-from-Marvell-bo.patch
  0003-SMILE-Plug-device-tree-file.patch
  0004-fix-mvsdio-eMMC-timing.patch
  0005-net-smsc95xx-Allow-mac-address-to-be-set-as-a-parame.patch
  0006-set-default-cubietruck-led-triggers.patch
  0007-exynos4412-odroid-set-higher-minimum-buck2-regulator.patch
  0008-ARM-dove-enable-ethernet-on-D3Plug.patch
  0009-USB-Armory-MkII-support.patch
  # ChromiumOS patches
  0001-CHROMIUM-block-partitions-efi-Add-support-for-IGNORE.patch
)
source_armv7h+=(config.aarch64)
validpgpkeys=(
  '474402C8C582DAFBE389C427BCB7CF877E7D47A7' # Alexandre Oliva
  '6DB9C4B4F0D8C0DC432CF6E4227CA7C556B2BA78' # David P.
)
sha512sums=('4805b2956f628c6581e86d67b1996b5b404e7f4b5d29ecfe708ddca45344571d75018364d8f0049835d4286ca1ba591307be263536d1bed0ea006696a8b8ac73'
            'SKIP'
            '73051904152f286189a29ee900d8717ae66f16b650a459647bcfb4290aee871e446684114703e59c7cf19fe443d57496af584e756a6efc3659be8f9b811b90fb'
            'SKIP'
            '13cb5bc42542e7b8bb104d5f68253f6609e463b6799800418af33eb0272cc269aaa36163c3e6f0aacbdaaa1d05e2827a4a7c4a08a029238439ed08b89c564bb3'
            'SKIP'
            '7a3716bfe3b9f546da309c7492f3e08f8f506813afeb1c737a474c83313d5c313cf4582b65215c2cfce3b74d9d1021c96e8badafe8f6e5b01fe28d2b5c61ae78'
            'SKIP'
            '267295aa0cea65684968420c68b32f1a66a22d018b9d2b2c1ef14267bcf4cb68aaf7099d073cbfefe6c25c8608bdcbbd45f7ac8893fdcecbf1e621abdfe9ecc1'
            'SKIP'
            '779a9e845846f95fe22a1b38df12cf93a2e5ad48e2dc68a7e93a87fccc1850f27a3015b8e54734fa83a3583c5a76daebf8ae1b3035b666dcd3aed2c24203f0ad'
            '30db5feff858901b72f15b2145a42c16be9fad0b5a61ac5ce09c15a2a86cd13251dc0f41f27a2b077ec242ee5242990edd7a7da3698be8b76bb736f05750b119'
            'a47fc7d2cf609544cbcd5e43530c892e77d192088ddf841813ffe6f116e16e97554f09a8f4c1184bf20b129f80e1b0e52eadd57ca5a1d4bb45e44f87dc91edca'
            '53103bf55b957b657039510527df0df01279dec59cda115a4d6454e4135025d4546167fa30bdc99107f232561c1e096d8328609ab5a876cf7017176f92ad3e0b'
            '167bc73c6c1c63931806238905dc44c7d87c5a5c0f6293159f2133dfe717fb44081018d810675716d1605ec7dff5e8333b87b19e09e2de21d0448e447437873b'
            'bb6718984a7357c9b00c37e4788480e5b8b75018c172ecc1441bc3fc5d2d42444eb5d8c7f9d2e3a7d6fed6d03acb565e3c0559486e494c40a7fe6bd0570c9ede'
            '143dea30c6da00e504c99984a98a0eb2411f558fcdd9dfa7f607d6c14e9e7dffff9cb00121d9317044b07e3e210808286598c785ee854084b993ec9cb14d8232'
            '02af4dd2a007e41db0c63822c8ab3b80b5d25646af1906dc85d0ad9bb8bbf5236f8e381d7f91cf99ed4b0978c50aee37cb9567cdeef65b7ec3d91b882852b1af'
            'b8fe56e14006ab866970ddbd501c054ae37186ddc065bb869cf7d18db8c0d455118d5bda3255fb66a0dde38b544655cfe9040ffe46e41d19830b47959b2fb168'
            'cbb533ae0bd68566e10fbf55fedd81374905ab301fc5d2a34a44a93a5346d9a70157a4a3323406c5baf7410841149dd6e0ef98559368623cc96fc2175b7ca5ed'
            '98e97155f86bbe837d43f27ec1018b5b6fdc6c372d6f7f2a0fe29da117d53979d9f9c262f886850d92002898682781029b80d4ee923633fc068f979e6c8254be')
sha512sums_armv7h=('e0f456a12a9959ec1d2d670ef16dca7e1878f1d5291ac30c7fbcca8bc7f69e9820c9fe7589a70515a462376dcdb034176a2834bc7b12bc64398e1c66a6e217ae'
                   'SKIP'
                   'a3b23a92a6f9ee4c6200244e99b62e77af1f18cc9f9714f671c7e754502d0341a93b0461a4a5562329dc51822ae06ff713208ec7092d480492163862a455377c'
                   '1919ef4738ce25f405e5c68b13233ce19d821ebb65fcd4f8f55a268a2f25029b8a8c0f7ac1cb2ecb9026fc43a4851eca182001baa2dc32653ec34dbb13106a72'
                   'd49d464bac530ff6e51ff117dcef046e45440aba6020f6c100958b664417f0a91cd045d3b132d86e8b74928c1a72fcec1ee41c6da8b432f6525a35a6a9c2cad9'
                   '99c6694d78d3232df078fbe8ec8948c278aea94c1784e27d052d92a3bf23757c4341be3477ef42741bba0f25d11e520def01cdd0cdd24ef9e0005aefff6a90f6'
                   'd9a22997da50c735090c3b48828cae45ee7e4dac8f54acfa723c8200e94103440e1b30059126c95aea307aa0c344340cc0ce72bd7b0982016707676d2dc0bb63'
                   'cd35bafeb918a14ffdbf87bc0c056a9e0ec4887827c32dd9889dbdda5c366cbcf0e753f223098c0cc4f7f58234dd6311dd06dbbebca54e86af6d02f96a7bda98'
                   '0e9200c19666cf9e8f13242ff1d76bc43953f98e3a2dd015c7242d780c856af39c0c24bfe8643ab0492ab4422cc72428c724b429899280ff348c8a5cdb918808'
                   '22a02ac89eb579b7a1cc581944b16ce946d0a8969418f5162ef9b6bb32b20e545998c74a6f11757ad6514c77d6f825cf2116695bcb97a7f68331ddd8b1fe4080'
                   '627ececc2ae6d3c50f29ab26e1e74a34c494f520341958d8c1196e52fdeb0cdcb606ebb1bc0be6324b2ca0f64c75fc9707c1825e50c24369c4241da5022e1675'
                   '7bda2ad7eb81af802873cb6764cb9c675ec50ceeb5adc487881ebc8c316cf55f836e56c2cc67494a2920e86494861db2eb924b7ff9b151ae3c5b0e493c373bf9')
sha512sums_armv7h+=('db0e6c01b222d1ea035fe4242021d534ca48e09181189fb4e594e000b2ac9340df651cafd65455557b5bb1408c4f343516a9dc3656bfde25ceaa4ad82b9b5532')

_replacesarchkernel=("${_replacesarchkernel[@]/\%/${pkgbase#linux-libre}}")
_replacesoldkernels=("${_replacesoldkernels[@]/\%/${pkgbase#linux-libre}}")
_replacesoldmodules=("${_replacesoldmodules[@]/\%/${pkgbase#linux-libre}}")

case "$CARCH" in
  i686) KARCH=x86;CROSS_COMPILE=x86_64-pc-linux-gnu-;;
  armv7h) KARCH=arm64;CROSS_COMPILE=aarch64-linux-gnu-;;
esac

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

prepare() {
  cd $_srcname

  if [ "${_srcname##*-}" != "$pkgver" ]; then
    echo "Applying upstream patch..."
    patch -Np1 < "../patch-${_srcname##*-}-gnu-$pkgver-gnu"
  fi

  echo "Adding freedo as boot logo..."
  install -m644 -t drivers/video/logo \
    ../logo_linux_{clut224.ppm,vga16.ppm,mono.pbm}

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

  if [ "$CARCH" = "armv7h" ]; then
    local src_armv7h
    for src_armv7h in "${source_armv7h[@]}"; do
      src_armv7h="${src_armv7h%%::*}"
      src_armv7h="${src_armv7h##*/}"
      [[ $src_armv7h = *.patch ]] || continue
      echo "Applying patch $src_armv7h..."
      patch -Np1 < "../$src_armv7h"
    done
  fi

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

  echo "Setting config..."
  case "$CARCH" in
  i686) cp ../config.x86_64 .config;;
  # config.aarch64 comes straight from Arch Linux ARM and doesn't have the
  # compatibility for 32bit rootfs enabled. This makes maintenance faster than
  # having to modify the configuration file by hand at each new kernel release.
  armv7h) cp ../config.aarch64 .config;echo 'CONFIG_COMPAT=y' >> .config;;
  esac
  make ARCH=$KARCH CROSS_COMPILE=$CROSS_COMPILE olddefconfig

  make ARCH=$KARCH CROSS_COMPILE=$CROSS_COMPILE -s kernelrelease > version
  echo "Prepared $pkgbase version $(<version)"
}

build() {
  cd $_srcname
  make ARCH=$KARCH CROSS_COMPILE=$CROSS_COMPILE all
  make ARCH=$KARCH CROSS_COMPILE=$CROSS_COMPILE htmldocs
}

_package() {
  pkgdesc="The $pkgdesc kernel and modules"
  depends=(coreutils kmod initramfs)
  optdepends=('crda: to set the correct wireless channels of your country'
              'linux-libre-firmware: firmware images needed for some devices')
  provides=(VIRTUALBOX-GUEST-MODULES WIREGUARD-MODULE)
  replaces=(virtualbox-guest-modules-arch wireguard-arch)
  provides+=("${_replacesarchkernel[@]/%/=$pkgver}" "LINUX-ABI_VERSION=$pkgver")
  conflicts=("${_replacesarchkernel[@]}" "${_replacesoldkernels[@]}" "${_replacesoldmodules[@]}")
  replaces+=("${_replacesarchkernel[@]}" "${_replacesoldkernels[@]}" "${_replacesoldmodules[@]}")

  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
  # The default image target is Image.gz on arm64 but some u-boot
  # configurations and/or versions don't support that, so we use Image instead.
  if [ "$KARCH" = "arm64" ]; then
    install -Dm644 arch/$KARCH/boot/Image "$modulesdir/vmlinuz"
  else
    install -Dm644 "$(make ARCH=$KARCH CROSS_COMPILE=$CROSS_COMPILE -s image_name)" "$modulesdir/vmlinuz"
  fi

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

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

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

  if [ "$CARCH" = "armv7h" ]; then
    echo "Installing device tree binaries..."
    make ARCH=$KARCH CROSS_COMPILE=$CROSS_COMPILE INSTALL_DTBS_PATH="$pkgdir/boot/dtbs/$pkgbase" dtbs_install

    # armv7h presets only work with ALL_kver=$kernver
    backup=("etc/mkinitcpio.d/$pkgbase.preset")
    echo "Installing mkinitcpio preset..."
    sed "s|%PKGBASE%|$pkgbase|g;s|%KERNVER%|$kernver|g" ../linux-armv7h.preset \
      | install -Dm644 /dev/stdin "$pkgdir/etc/mkinitcpio.d/$pkgbase.preset"
  fi
}

_package-headers() {
  pkgdesc="Headers and scripts for building modules for the $pkgdesc kernel"
  provides=("${_replacesarchkernel[@]/%/-headers=$pkgver}")
  conflicts=("${_replacesarchkernel[@]/%/-headers}" "${_replacesoldkernels[@]/%/-headers}")
  replaces=("${_replacesarchkernel[@]/%/-headers}" "${_replacesoldkernels[@]/%/-headers}")

  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 "$builddir/arch/$KARCH" -m644 arch/$KARCH/Makefile
  if [[ $CARCH = i686 ]]; then
    install -Dt "$builddir/arch/$KARCH" -m644 arch/$KARCH/Makefile_32.cpu
  fi
  cp -t "$builddir" -a scripts

  # add objtool for external module building and enabled VALIDATION_STACK option
  if [[ -e tools/objtool/objtool ]]; then
    install -Dt "$builddir/tools/objtool" tools/objtool/objtool
  fi

  # 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/$KARCH" -a arch/$KARCH/include
  install -Dt "$builddir/arch/$KARCH/kernel" -m644 arch/$KARCH/kernel/asm-offsets.s

  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

  # from linux-armv7
  if [ "$KARCH" = "armv7h" ]; then
    for i in dove exynos omap2; do
      mkdir -p "$builddir/arch/$KARCH/mach-$i"
      cp -t "$builddir/arch/$KARCH/mach-$i/" -a arch/$KARCH/mach-$i/include
    done
    for i in omap orion samsung versatile; do
      mkdir -p "$builddir/arch/$KARCH/plat-$i"
      cp -t "$builddir/arch/$KARCH/plat-$i/" -a arch/$KARCH/plat-$i/include
    done
  fi

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

  echo "Removing unneeded architectures..."
  local arch
  for arch in "$builddir"/arch/*/; do
    [[ $arch = */$KARCH/ ]] && 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 $pkgdesc kernel"
  provides=("${_replacesarchkernel[@]/%/-docs=$pkgver}")
  conflicts=("${_replacesarchkernel[@]/%/-docs}" "${_replacesoldkernels[@]/%/-docs}")
  replaces=("${_replacesarchkernel[@]/%/-docs}" "${_replacesoldkernels[@]/%/-docs}")

  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"
}

_package-chromebook() {
  pkgdesc="Experimental $pkgdesc kernel sign for Chromebooks"
  depends=(linux-libre-64=$pkgver)
  provides+=("linux-libre-chromebook=$pkgver")
  conflicts+=('linux-libre-chromebook')
  replaces+=('linux-libre-chromebook')
  install=linux-libre-chromebook.install

  cd $_srcname

  cp ../kernel.its .
  mkimage -D "-I dts -O dtb -p 2048" -f kernel.its kernel.signed
  dd if=/dev/zero of=bootloader.bin bs=512 count=1
  echo 'console=tty0 init=/sbin/init root=PARTUUID=%U/PARTNROFF=1 rootwait rw noinitrd' > cmdline

  echo "Creating kernel sign..."
  vbutil_kernel \
    --pack vmlinux.kpart \
    --version 1 \
    --vmlinuz kernel.signed \
    --arch aarch64 \
    --keyblock ../kernel.keyblock \
    --signprivate ../kernel_data_key.vbprivk \
    --config cmdline \
    --bootloader bootloader.bin

  echo "Installing kernel sign..."
  mkdir -p "$pkgdir/boot"
  cp vmlinux.kpart "$pkgdir/boot"
}

pkgname=("$pkgbase" "$pkgbase-headers" "$pkgbase-docs")
# The chromebook package is disabled until the following error is fixed:
# |  ==> Starting package_linux-libre-64-chromebook()...
# |  FATAL ERROR: Couldn't open "arch/arm/boot/zImage": No such file or directory
# |  mkimage: Can't read kernel.signed.tmp: Invalid argument
# [[ $CARCH = armv7h ]] && pkgname+=("$pkgbase-chromebook")
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: