# Maintainer: Josip Ponjavic <josipponjavic at gmail dot com>
# Contributor:

### BUILD OPTIONS
# Set these variables to ANYTHING that is not null to enable them

# Tweak kernel options prior to a build via nconfig
_makenconfig=

_enable_gcc_more_v="y"
# Optionally select a sub architecture by number if building in a clean chroot
# Leaving this entry blank will require user interaction during the build
# which will cause a failure to build if using makechrootpkg. Note that the
# generic (default) option is 26.
#
# Note - the march=native option is unavailable by this method, use the nconfig
# and manually select it.
#
#  1. AMD Opteron/Athlon64/Hammer/K8 (MK8)
#  2. AMD Opteron/Athlon64/Hammer/K8 with SSE3 (MK8SSE3)
#  3. AMD 61xx/7x50/PhenomX3/X4/II/K10 (MK10)
#  4. AMD Barcelona (MBARCELONA)
#  5. AMD Bobcat (MBOBCAT)
#  6. AMD Jaguar (MJAGUAR)
#  7. AMD Bulldozer (MBULLDOZER)
#  8. AMD Piledriver (MPILEDRIVER)
#  9. AMD Steamroller (MSTEAMROLLER)
#  10. AMD Excavator (MEXCAVATOR)
#  11. AMD Zen (MZEN)
#  12. Intel P4 / older Netburst based Xeon (MPSC)
#  13. Intel Atom (MATOM)
#  14. Intel Core 2 (MCORE2)
#  15. Intel Nehalem (MNEHALEM)
#  16. Intel Westmere (MWESTMERE)
#  17. Intel Silvermont (MSILVERMONT)
#  18. Intel Sandy Bridge (MSANDYBRIDGE)
#  19. Intel Ivy Bridge (MIVYBRIDGE)
#  20. Intel Haswell (MHASWELL)
#  21. Intel Broadwell (MBROADWELL)
#  22. Intel Skylake (MSKYLAKE)
#  23. Intel Skylake X (MSKYLAKEX)
#  24. Intel Cannon Lake (MCANNONLAKE)
#  25. Intel Ice Lake (MICELAKE)
#  26. Generic-x86-64 (GENERIC_CPU)
_subarch=

# Compile ONLY probed modules
# Build in only the modules that you currently have probed in your system VASTLY
# reducing the number of modules built and the build time.
#
# WARNING - ALL modules must be probed BEFORE you begin making the pkg!
#
# To keep track of which modules are needed for your specific system/hardware,
# give module_db script a try: https://aur.archlinux.org/packages/modprobed-db
# This PKGBUILD will call it directly to probe all the modules you have logged!
#
# More at this wiki page ---> https://wiki.archlinux.org/index.php/Modprobed-db
_localmodcfg=

# If you have laptop with optimus and it hangs on boot one solution might be 
# to set acpi_rev_override. Yet for this to happen kernel should be compiled
# with `CONFIG_ACPI_REV_OVERRIDE_POSSIBLE`. Set next variable to `y` to enable.
_rev_override="n"

### IMPORTANT: Do no edit below this line unless you know what you're doing

_major=4.20
_minor=15
_srcname=linux-${_major}
_clr=${_major}.14-710
pkgbase=linux-clear
pkgver=${_major}.${_minor}
pkgrel=1
arch=('x86_64')
url="https://github.com/clearlinux-pkgs/linux"
license=('GPL2')
makedepends=('bc' 'git' 'inetutils' 'kmod' 'libelf' 'linux-firmware' 'xmlto')
options=('!strip')
_gcc_more_v='20180509'
source=(
  "https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-${_major}.tar.xz"
  "https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-${_major}.tar.sign"
  "https://cdn.kernel.org/pub/linux/kernel/v4.x/patch-${pkgver}.xz"
  "clearlinux::git+https://github.com/clearlinux-pkgs/linux.git#tag=${_clr}"
  'https://downloadmirror.intel.com/28039/eng/microcode-20180807.tgz'
  "enable_additional_cpu_optimizations-$_gcc_more_v.tar.gz::https://github.com/graysky2/kernel_gcc_patch/archive/$_gcc_more_v.tar.gz"
  '60-linux.hook'  # pacman hook for depmod
  '90-linux.hook'  # pacman hook for initramfs regeneration
  '99-linux.hook'  # pacman hook for remove initramfs
  'linux.preset'   # standard config files for mkinitcpio ramdisk
)

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

prepare() {
    cd ${_srcname}

    ### Add upstream patches
        msg2 "Add upstream patches"
        patch -Np1 -i ../patch-${pkgver}

    ### Setting version
        msg2 "Setting version..."
        scripts/setlocalversion --save-scmversion
        echo "-$pkgrel" > localversion.10-pkgrel
        echo "$_kernelname" > localversion.20-pkgname

    ### Add Clearlinux patches
        for i in $(grep '^Patch' ${srcdir}/clearlinux/linux.spec | grep -Ev '^Patch0126|^Patch0003' | sed -n 's/.*: //p'); do
        msg2 "Applying patch ${i}..."
        patch -Np1 -i "$srcdir/clearlinux/${i}"
        done

    ### Setting config
        msg2 "Setting config..."
        cp -Tf $srcdir/clearlinux/config ./.config

    ### Compress modules
        msg2 "Enabling XZ compressed modules..."
        sed -i 's|^# CONFIG_MODULE_COMPRESS|\
CONFIG_MODULE_COMPRESS=y\
# CONFIG_MODULE_COMPRESS_GZIP is not set\
CONFIG_MODULE_COMPRESS_XZ=y|' ./.config

    ### Set ACPI_REV_OVERRIDE_POSSIBLE to prevent optimus lockup
        if [ "${_rev_override}" = "y" ]; then
        msg2 "Enabling ACPI Rev Override Possible..."
        sed -i "s|# CONFIG_ACPI_REV_OVERRIDE_POSSIBLE is not set|CONFIG_ACPI_REV_OVERRIDE_POSSIBLE=y|g" ./.config
        fi

    ### Copying i915 firmware and intel-ucode
        msg2 "Copying i915 firmware and intel-ucode..."
        cp -a /usr/lib/firmware/i915 firmware/
        cp -a ${srcdir}/intel-ucode firmware/
        cp  ${srcdir}/intel-ucode-with-caveats/06* firmware/intel-ucode/
        rm -f firmware/intel-ucode/0f*

    ### Patch source to unlock additional gcc CPU optimizations
        # https://github.com/graysky2/kernel_gcc_patch
        if [ "${_enable_gcc_more_v}" = "y" ]; then
        msg2 "Enabling additional gcc CPU optimizations..."
        patch -Np1 -i "$srcdir/kernel_gcc_patch-$_gcc_more_v/enable_additional_cpu_optimizations_for_gcc_v8.1+_kernel_v4.13+.patch"
        fi

    ### Get kernel version
        if [ "${_enable_gcc_more_v}" = "y" ] || [ -n "${_subarch}" ]; then
        yes "$_subarch" | make oldconfig
        else
        make prepare
        fi

    ### Prepared version
        make -s kernelrelease > ../version
        msg2 "Prepared %s version %s" "$pkgbase" "$(<../version)"

    ### Optionally load needed modules for the make localmodconfig
        # See https://aur.archlinux.org/packages/modprobed-db
        if [ -n "$_localmodcfg" ]; then
        msg2 "If you have modprobed-db installed, running it in recall mode now"
            if [ -e /usr/bin/modprobed-db ]; then
            [[ -x /usr/bin/sudo ]] || {
            echo "Cannot call modprobe with sudo. Install sudo and configure it to work with this user."
            exit 1; }
            sudo /usr/bin/modprobed-db recall
            make localmodconfig
            fi
        fi

    ### Running make nconfig

        [[ -z "$_makenconfig" ]] || make nconfig

    ### Save configuration for later reuse

        cp -Tf ./.config "${startdir}/config-${pkgver}-${pkgrel}${_kernelname}"
}

build() {
    cd ${_srcname}

    make bzImage modules
}

_package() {
    pkgdesc="Clearlinux kernel and modules"
    depends=('coreutils' 'linux-firmware' 'kmod' 'mkinitcpio>=0.7')
    optdepends=('crda: to set the correct wireless channels of your country' 'modprobed-db: Keeps track of EVERY kernel module that has ever been probed - useful for those of us who make localmodconfig')
    provides=('WIREGUARD-MODULE')
    backup=("etc/mkinitcpio.d/${pkgbase}.preset")
    install=linux.install

    local kernver="$(<version)"
    local modulesdir="$pkgdir/usr/lib/modules/$kernver"

    cd ${_srcname}

    msg2 "Installing boot image..."
    # systemd expects to find the kernel here to allow hibernation
    # https://github.com/systemd/systemd/commit/edda44605f06a41fb86b7ab8128dcf99161d2344
    install -Dm644 "$(make -s image_name)" "$modulesdir/vmlinuz"
    install -Dm644 "$modulesdir/vmlinuz" "$pkgdir/boot/vmlinuz-$pkgbase"

    msg2 "Installing modules..."
    make INSTALL_MOD_PATH="$pkgdir/usr" modules_install

    # a place for external modules,
    # with version file for building modules and running depmod from hook
    local extramodules="extramodules$_kernelname"
    local extradir="$pkgdir/usr/lib/modules/$extramodules"
    install -Dt "$extradir" -m644 ../version
    ln -sr "$extradir" "$modulesdir/extramodules"

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

    msg2 "Installing hooks..."
    
    # 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

    # fill in mkinitcpio preset and pacman hooks
    sed "$subst" ../linux.preset | install -Dm644 /dev/stdin \
        "$pkgdir/etc/mkinitcpio.d/$pkgbase.preset"
    sed "$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-${pkgbase}.hook"
    sed "$subst" ../99-linux.hook | install -Dm644 /dev/stdin \
        "$pkgdir/usr/share/libalpm/hooks/99-${pkgbase}.hook"

    msg2 "Fixing permissions..."
    chmod -Rc u=rwX,go=rX "$pkgdir"
}

_package-headers() {
    pkgdesc="Header files and scripts for building modules for linux-clear"

    local builddir="$pkgdir/usr/lib/modules/$(<version)/build"

    cd ${_srcname}

    msg2 "Installing build files..."
    install -Dt "$builddir" -m644 Makefile .config Module.symvers System.map vmlinux
    install -Dt "$builddir/kernel" -m644 kernel/Makefile
    install -Dt "$builddir/arch/x86" -m644 arch/x86/Makefile
    cp -t "$builddir" -a scripts

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

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

    # ???
    mkdir "$builddir/.tmp_versions"

    msg2 "Installing headers..."
    cp -t "$builddir" -a include
    cp -t "$builddir/arch/x86" -a arch/x86/include
    install -Dt "$builddir/arch/x86/kernel" -m644 arch/x86/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

    msg2 "Installing KConfig files..."
    find . -name 'Kconfig*' -exec install -Dm644 {} "$builddir/{}" \;

    msg2 "Removing unneeded architectures..."
    local arch
    for arch in "$builddir"/arch/*/; do
        [[ $arch = */x86/ ]] && continue
        echo "Removing $(basename "$arch")"
        rm -r "$arch"
    done

    msg2 "Removing documentation..."
    rm -r "$builddir/Documentation"

    msg2 "Removing broken symlinks..."
    find -L "$builddir" -type l -printf 'Removing %P\n' -delete

    msg2 "Removing loose objects..."
    find "$builddir" -type f -name '*.o' -printf 'Removing %P\n' -delete

    msg2 "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)

    msg2 "Adding symlink..."
    mkdir -p "$pkgdir/usr/src"
    ln -sr "$builddir" "$pkgdir/usr/src/$pkgbase-$pkgver"

    msg2 "Fixing permissions..."
    chmod -Rc u=rwX,go=rX "$pkgdir"
}

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

sha256sums=('ad0823183522e743972382df0aa08fb5ae3077f662b125f1e599b0b2aaa12438'
            'SKIP'
            'd260efca438eaadd011e3eba4b106615059ddfe1926007cc023e490929c27bca'
            'SKIP'
            '29f9e8dc27e6c9b6488cecd7fe2394030307799e511db2d197d9e6553a7f9e40'
            '226e30068ea0fecdb22f337391385701996bfbdba37cdcf0f1dbf55f1080542d'
            'ae2e95db94ef7176207c690224169594d49445e04249d2499e9d2fbc117a0b21'
            'c043f3033bb781e2688794a59f6d1f7ed49ef9b13eb77ff9a425df33a244a636'
            'ed9d35cb7d7bd829ff6253353efa5e2d119820fe4f4310aea536671f5e4caa37'
            'ad6344badc91ad0630caacde83f7f9b97276f80d26a20619a87952be65492c65')

validpgpkeys=(
  'ABAF11C65A2970B130ABE3C479BE3E4300411886'  # Linus Torvalds
  '647F28654894E3BD457199BE38DBBDC86092693E'  # Greg Kroah-Hartman
)