# Contributor (Arch): Tobias Powalowski <tpowa@archlinux.org>
# Contributor (Arch): Thomas Baechler <thomas@archlinux.org>
# Maintainer: André Silva <emulatorman@parabola.nu>
# Contributor: Nicolás Reynolds <fauno@kiwwwi.com.ar>
# Contributor: Sorin-Mihai Vârgolici <smv@yobicore.org>
# Contributor: Michał Masłowski <mtjm@mtjm.eu>
# Contributor: Márcio Silva <coadde@parabola.nu>
# Contributor: Luke Shumaker <lukeshu@sbcglobal.net>

pkgbase=linux-libre-lts-knock # Build stock -libre-lts-knock kernel
#pkgbase=linux-libre-custom # Build kernel with a different name
_basekernel=3.10
_sublevel=53
_knockpatchver=${_basekernel}
pkgver=${_basekernel}.${_sublevel}
pkgrel=1
_lxopkgver=${_basekernel}.52 # nearly always the same as pkgver
arch=('i686' 'x86_64' 'mips64el')
url="https://gnunet.org/knock"
license=('GPL2')
makedepends=('xmlto' 'docbook-xsl' 'kmod' 'inetutils' 'bc')
options=('!strip')
source=("http://linux-libre.fsfla.org/pub/linux-libre/releases/${_basekernel}-gnu/linux-libre-${_basekernel}-gnu.tar.xz"
        "http://linux-libre.fsfla.org/pub/linux-libre/releases/${pkgver}-gnu/patch-${_basekernel}-gnu-${pkgver}-gnu.xz"
        "http://gnunet.org/sites/default/files/tcp_stealth_${_knockpatchver}.diff"
        # the main kernel config files
        'config.i686' 'config.x86_64'
        # standard config files for mkinitcpio ramdisk
        "${pkgbase}.preset"
        'Kbuild'
        'Kbuild.platforms'
        'logo_linux_'{clut224.ppm,vga16.ppm,mono.pbm}
        'change-default-console-loglevel.patch'
        'criu-no-expert.patch'
        "http://www.linux-libre.fsfla.org/pub/linux-libre/lemote/gnewsense/pool/debuginfo/linux-patches-${_lxopkgver}-gnu_0loongsonlibre_mipsel.tar.xz")
md5sums=('d562fd52580a3b6b18b6eeb5921d1d5c'
         '4840f0db6af66cbce923b1043971c256'
         '26380d6f05471ef8e065a77d87588009'
         '25ad0606de251a5734f4535c61452a56'
         '158cb922d9b43028f6c45c696e773915'
         '02023949955a138c44bb0c46227a6d18'
         '2967cecc3af9f954ccc822fd63dca6ff'
         '8267264d9a8966e57fdacd1fa1fc65c4'
         '071d4939e9ef4256e4c027ef3c864903'
         '2ae9ef17f45b39ff9e6e172c0c97d263'
         '96c2ae40e3b1cdd90fe7e6dba8078922'
         'f3def2cefdcbb954c21d8505d23cc83c'
         'd50c1ac47394e9aec637002ef3392bd1'
         '200668954d1cee93fb649196e3df8bde')
if [ "$CARCH" != "mips64el" ]; then
    # don't use the Loongson-specific patches on non-mips64el arches.
    unset source[${#source[@]}-1]
    unset md5sums[${#md5sums[@]}-1]
fi

_kernelname=${pkgbase#linux-libre}
_localversionname=-libre-lts-knock

prepare() {
  cd "${srcdir}/linux-${_basekernel}"

  if [ "${_basekernel}" != "${pkgver}" ]; then
    patch -Np1 -i "${srcdir}/patch-${_basekernel}-gnu-${pkgver}-gnu"
  fi

  # add knock patch
  patch -p1 -i "${srcdir}/tcp_stealth_${_knockpatchver}.diff"

  # add freedo as boot logo
  install -m644 -t drivers/video/logo \
    "${srcdir}/logo_linux_"{clut224.ppm,vga16.ppm,mono.pbm}

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

  # set DEFAULT_CONSOLE_LOGLEVEL to 4 (same value as the 'quiet' kernel param)
  # remove this when a Kconfig knob is made available by upstream
  # (relevant patch sent upstream: https://lkml.org/lkml/2011/7/26/227)
  patch -Np1 -i "${srcdir}/change-default-console-loglevel.patch"

  # allow criu without expert option set
  # patch from fedora
  patch -Np1 -i "${srcdir}/criu-no-expert.patch"

  if [ "$CARCH" == "mips64el" ]; then
    sed -i "s|^EXTRAVERSION.*|EXTRAVERSION =-libre-lts-knock|" Makefile
    sed -r "s|^( SUBLEVEL = ).*|\1$_sublevel|" \
        < "${srcdir}/lxo-config.patch" > lxo-config.patch
    msg2 "Adding loongson-community patches"
    patch -Np1 -i ${srcdir}/${_basekernel}*-*-loongson-community.patch
    patch -Np0 -i lxo-config.patch

  # ensure N32, add localversion, remove uevent helper as per
  # https://git.kernel.org/?p=linux/hotplug/udev.git;a=blob_plain;f=README
  # and make USB storage support builtin (e.g. for booting from USB
  # disks without slowly loading an initramfs)
    sed -ri \
        -e "s|CONFIG_MIPS32_N32=.*|CONFIG_MIPS32_N32=y|g" \
        -e "s|CONFIG_UEVENT_HELPER_PATH=.*|CONFIG_UEVENT_HELPER_PATH=\"\"|g" \
        -e "s|CONFIG_LOCALVERSION=.*|CONFIG_LOCALVERSION=\"${_localversionname}\"|g" \
        -e "s;(CONFIG_USB(_COMMON|_EHCI_HCD|_OHCI_HCD|_STORAGE.*|_UAS)?)=.*;\1=y;g" \
        ./.config
  else
    cat "${srcdir}/config.${CARCH}" > ./.config # simpler
  fi

  if [ "${_kernelname}" != "" ]; then
    sed -i "s|CONFIG_LOCALVERSION=.*|CONFIG_LOCALVERSION=\"${_localversionname}\"|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
}

build() {
  cd "${srcdir}/linux-${_basekernel}"

  # 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

  # save configuration for later reuse
  if [ "${CARCH}" = "x86_64" ]; then
    cat .config > "${startdir}/config.x86_64.last"
  else
    cat .config > "${startdir}/config.i686.last"
  fi

  ####################
  # stop here
  # this is useful to configure the kernel
  #msg "Stopping build"; return 1
  ####################

  # build!
  if [ "$CARCH" == "mips64el" ]; then
    # The build system passes it directly to linker, disable to avoid
    # having unknown -Wl,... options.
    export LDFLAGS=""
    # bzImage is arch-specific and not supported on mips; vmlinux is
    # useful for oprofile.
    make ${MAKEFLAGS} LOCALVERSION= vmlinux vmlinuz modules
  else
    make ${MAKEFLAGS} LOCALVERSION= bzImage modules
  fi
}

_package() {
  pkgdesc="The ${pkgbase^} kernel and modules - stable longtime supported kernel package suitable for servers with support for stealth TCP sockets"
  [ "${pkgbase}" = "linux-libre" ] && groups=('base')
  depends=('coreutils' 'linux-libre-firmware' 'kmod')
  optdepends=('crda: to set the correct wireless channels of your country')
  provides=("kernel26${_kernelname}=${pkgver}" "linux${_kernelname}=${pkgver}" "linux${_kernelname/-lts/}")
  conflicts=("kernel26${_kernelname}" "kernel26-libre${_kernelname}" "linux${_kernelname}" "linux${_kernelname/-lts/}" "linux-libre${_kernelname/-lts/}")
  replaces=("kernel26${_kernelname}" "kernel26-libre${_kernelname}" "linux${_kernelname}" "linux${_kernelname/-lts/}" "linux-libre${_kernelname/-lts/}")
  backup=("etc/mkinitcpio.d/${pkgbase}.preset")
  install=${pkgbase}.install
  if [ "$CARCH" = "mips64el" ]; then
      optdepends+=('mkinitcpio: to make the initramfs (needs reinstall of this package)')
      conflicts+=('mkinitcpio<0.7')
  else
      depends+=('mkinitcpio>=0.7')
  fi

  cd "${srcdir}/linux-${_basekernel}"

  KARCH=x86
  [ $CARCH = "mips64el" ] && KARCH=mips

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

  mkdir -p "${pkgdir}"/{lib/modules,lib/firmware,boot}
  make LOCALVERSION= INSTALL_MOD_PATH="${pkgdir}" modules_install

  if [ "$CARCH" == "mips64el" ]; then
    cp vmlinuz "${pkgdir}/boot/vmlinuz-${pkgbase}"
    cp vmlinux "${pkgdir}/boot/vmlinux-${pkgbase}"
  else
    cp arch/${KARCH}/boot/bzImage "${pkgdir}/boot/vmlinuz-${pkgbase}"
  fi

  # add vmlinux
  install -D -m644 vmlinux "${pkgdir}/usr/src/linux-${_kernver}/vmlinux"

  # set correct depmod command for install
  cp -f "${startdir}/${install}" "${startdir}/${install}.pkg"
  true && install=${install}.pkg
  sed \
    -e  "s/KERNEL_NAME=.*/KERNEL_NAME=${_kernelname}/" \
    -e  "s/KERNEL_VERSION=.*/KERNEL_VERSION=${_kernver}/" \
    -i "${startdir}/${install}"

  # install mkinitcpio preset file for kernel
  install -D -m644 "${srcdir}/${pkgbase}.preset" "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"
  sed \
    -e "1s|'linux*.*'|'${pkgbase}'|" \
    -e "s|ALL_kver=.*|ALL_kver=\"/boot/vmlinuz-${pkgbase}\"|" \
    -e "s|default_image=.*|default_image=\"/boot/initramfs-${pkgbase}.img\"|" \
    -e "s|fallback_image=.*|fallback_image=\"/boot/initramfs-${pkgbase}-fallback.img\"|" \
    -i "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"

  # mkinitcpio 0.7 relies on bzImage to find the kernel version
  if [ "$CARCH" == "mips64el" ]; then
    sed -e "s|ALL_kver=.*|ALL_kver=\"${_kernver}\"|" \
        -i "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"
  fi

  # remove build and source links
  rm -f "${pkgdir}"/lib/modules/${_kernver}/{source,build}
  # remove the firmware
  rm -rf "${pkgdir}/lib/firmware"
  # gzip -9 all modules to save 100MB of space
  find "${pkgdir}" -name '*.ko' -exec gzip -9 {} \;
  # make room for external modules
  ln -s "../extramodules-${_basekernel}${_localversionname:--libre-lts-knock}" "${pkgdir}/lib/modules/${_kernver}/extramodules"
  # add real version for building modules and running depmod from post_install/upgrade
  mkdir -p "${pkgdir}/lib/modules/extramodules-${_basekernel}${_localversionname:--libre-lts-knock}"
  echo "${_kernver}" > "${pkgdir}/lib/modules/extramodules-${_basekernel}${_localversionname:--libre-lts-knock}/version"

  # Now we call depmod...
  depmod -b "$pkgdir" -F System.map "$_kernver"

  # move module tree /lib -> /usr/lib
  mv "$pkgdir/lib" "$pkgdir/usr"
}

_package-headers() {
  pkgdesc="Header files and scripts for building modules for ${pkgbase^} kernel"
  provides=("kernel26${_kernelname}-headers=${pkgver}" "linux${_kernelname}-headers=${pkgver}" "linux${_kernelname/-lts/}-headers")
  conflicts=("kernel26${_kernelname}-headers" "kernel26-libre${_kernelname}-headers" "linux${_kernelname}-headers" "linux${_kernelname/-lts/}-headers" "linux-libre${_kernelname/-lts/}-headers")
  replaces=("kernel26${_kernelname}-headers" "kernel26-libre${_kernelname}-headers" "linux${_kernelname}-headers" "linux${_kernelname/-lts/}-headers" "linux-libre${_kernelname/-lts/}-headers")

  KARCH=x86
  [ $CARCH = "mips64el" ] && KARCH=mips

  # in case of repackaging this is empty
  if [ -z "${_kernver}" ]; then
    cd "${srcdir}/linux-${_basekernel}"
    _kernver="$(make LOCALVERSION= kernelrelease)"
  fi

  install -dm755 "${pkgdir}/usr/lib/modules/${_kernver}"

  cd "${pkgdir}/usr/lib/modules/${_kernver}"
  ln -sf ../../../src/linux-${_kernver} build

  cd "${srcdir}/linux-${_basekernel}"
  install -D -m644 Makefile \
    "${pkgdir}/usr/src/linux-${_kernver}/Makefile"
  install -D -m644 kernel/Makefile \
    "${pkgdir}/usr/src/linux-${_kernver}/kernel/Makefile"
  install -D -m644 .config \
    "${pkgdir}/usr/src/linux-${_kernver}/.config"

  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/include"

  for i in acpi asm-generic config crypto drm generated keys linux math-emu \
    media net pcmcia scsi sound trace uapi video xen; do
    cp -a include/${i} "${pkgdir}/usr/src/linux-${_kernver}/include/"
  done

  # copy arch includes for external modules
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/arch/${KARCH}"
  cp -a arch/${KARCH}/include "${pkgdir}/usr/src/linux-${_kernver}/arch/${KARCH}/"

  # copy files necessary for later builds
  cp Module.symvers "${pkgdir}/usr/src/linux-${_kernver}"
  cp -a scripts "${pkgdir}/usr/src/linux-${_kernver}"

  if [ "$CARCH" = "mips64el" ]; then
    cp arch/${KARCH}/Kbuild "${pkgdir}/usr/src/linux-${_kernver}/arch/${KARCH}/"
    cp -a arch/${KARCH}/loongson "${pkgdir}/usr/src/linux-${_kernver}/arch/${KARCH}/"
    cp ${srcdir}/Kbuild.platforms "${pkgdir}/usr/src/linux-${_kernver}/arch/${KARCH}/"
  fi

  # fix permissions on scripts dir
  chmod og-w -R "${pkgdir}/usr/src/linux-${_kernver}/scripts"
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/.tmp_versions"

  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/arch/${KARCH}/kernel"

  cp arch/${KARCH}/Makefile "${pkgdir}/usr/src/linux-${_kernver}/arch/${KARCH}/"

  if [ "${CARCH}" = "i686" ]; then
    cp arch/${KARCH}/Makefile_32.cpu "${pkgdir}/usr/src/linux-${_kernver}/arch/${KARCH}/"
  fi

  cp arch/${KARCH}/kernel/asm-offsets.s "${pkgdir}/usr/src/linux-${_kernver}/arch/${KARCH}/kernel/"

  # add headers for lirc package
  # pci
  for i in bt8xx cx88 saa7134; do
    mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/pci/${i}"
    cp -a drivers/media/pci/${i}/*.h "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/pci/${i}"
  done
  # usb
  for i in cpia2 em28xx pwc sn9c102; do
    mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/usb/${i}"
    cp -a drivers/media/usb/${i}/*.h "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/usb/${i}"
  done
  # i2c
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/i2c"
  cp drivers/media/i2c/*.h  "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/i2c/"
  for i in cx25840; do
    mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/i2c/${i}"
    cp -a drivers/media/i2c/${i}/*.h "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/i2c/${i}"
  done

  # add docbook makefile
  install -D -m644 Documentation/DocBook/Makefile \
    "${pkgdir}/usr/src/linux-${_kernver}/Documentation/DocBook/Makefile"

  # add dm headers
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/drivers/md"
  cp drivers/md/*.h "${pkgdir}/usr/src/linux-${_kernver}/drivers/md"

  # add inotify.h
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/include/linux"
  cp include/linux/inotify.h "${pkgdir}/usr/src/linux-${_kernver}/include/linux/"

  # add wireless headers
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/net/mac80211/"
  cp net/mac80211/*.h "${pkgdir}/usr/src/linux-${_kernver}/net/mac80211/"

  # add dvb headers for external modules
  # in reference to:
  # http://bugs.archlinux.org/task/9912
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/dvb-core"
  cp drivers/media/dvb-core/*.h "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/dvb-core/"
  # and...
  # http://bugs.archlinux.org/task/11194
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/include/config/dvb/"
  cp include/config/dvb/*.h "${pkgdir}/usr/src/linux-${_kernver}/include/config/dvb/"

  # add dvb headers for http://mcentral.de/hg/~mrec/em28xx-new
  # in reference to:
  # http://bugs.archlinux.org/task/13146
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/dvb-frontends/"
  cp drivers/media/dvb-frontends/lgdt330x.h "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/dvb-frontends/"
  cp drivers/media/i2c/msp3400-driver.h "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/i2c/"

  # add dvb headers
  # in reference to:
  # http://bugs.archlinux.org/task/20402
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/usb/dvb-usb"
  cp drivers/media/usb/dvb-usb/*.h "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/usb/dvb-usb/"
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/dvb-frontends"
  cp drivers/media/dvb-frontends/*.h "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/dvb-frontends/"
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/tuners"
  cp drivers/media/tuners/*.h "${pkgdir}/usr/src/linux-${_kernver}/drivers/media/tuners/"

  # add xfs and shmem for aufs building
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/fs/xfs"
  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/mm"
  cp fs/xfs/xfs_sb.h "${pkgdir}/usr/src/linux-${_kernver}/fs/xfs/xfs_sb.h"

  # copy in Kconfig files
  for i in `find . -name "Kconfig*"`; do
    mkdir -p "${pkgdir}"/usr/src/linux-${_kernver}/`echo ${i} | sed 's|/Kconfig.*||'`
    cp ${i} "${pkgdir}/usr/src/linux-${_kernver}/${i}"
  done

  chown -R root.root "${pkgdir}/usr/src/linux-${_kernver}"
  find "${pkgdir}/usr/src/linux-${_kernver}" -type d -exec chmod 755 {} \;

  # strip scripts directory
  find "${pkgdir}/usr/src/linux-${_kernver}/scripts" -type f -perm -u+w 2>/dev/null | while read binary ; do
    case "$(file -bi "${binary}")" in
      *application/x-sharedlib*) # Libraries (.so)
        /usr/bin/strip ${STRIP_SHARED} "${binary}";;
      *application/x-archive*) # Libraries (.a)
        /usr/bin/strip ${STRIP_STATIC} "${binary}";;
      *application/x-executable*) # Binaries
        /usr/bin/strip ${STRIP_BINARIES} "${binary}";;
    esac
  done

  # remove unneeded architectures
  rm -rf "${pkgdir}"/usr/src/linux-${_kernver}/arch/{alpha,arc,arm,arm26,arm64,avr32,blackfin,c6x,cris,frv,h8300,hexagon,ia64,m32r,m68k,m68knommu,metag,microblaze,mn10300,openrisc,parisc,powerpc,ppc,s390,score,sh,sh64,sparc,sparc64,tile,unicore32,um,v850,xtensa}
  if [ "$CARCH" = "mips64el" ]; then
    rm -rf ${pkgdir}/usr/src/linux-${_kernver}/arch/x86
  else
    rm -rf ${pkgdir}/usr/src/linux-${_kernver}/arch/mips
  fi
}

_package-docs() {
  pkgdesc="Kernel hackers manual - HTML documentation that comes with the ${pkgbase^} kernel"
  provides=("kernel26${_kernelname}-docs=${pkgver}" "linux${_kernelname}-docs=${pkgver}" "linux${_kernelname/-lts/}-docs")
  conflicts=("kernel26${_kernelname}-docs" "kernel26-libre${_kernelname}-docs" "linux${_kernelname}-docs" "linux${_kernelname/-lts/}-docs" "linux-libre${_kernelname/-lts/}-docs")
  replaces=("kernel26${_kernelname}-docs" "kernel26-libre${_kernelname}-docs" "linux${_kernelname}-docs" "linux${_kernelname/-lts/}-docs" "linux-libre${_kernelname/-lts/}-docs")

  cd "${srcdir}/linux-${_basekernel}"

  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}"
  cp -al Documentation "${pkgdir}/usr/src/linux-${_kernver}"
  find "${pkgdir}" -type f -exec chmod 444 {} \;
  find "${pkgdir}" -type d -exec chmod 755 {} \;

  # remove a file already in linux package
  rm -f "${pkgdir}/usr/src/linux-${_kernver}/Documentation/DocBook/Makefile"
}

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

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