# Maintainer: Kyle De'Vir (QuartzDragon) <kyle[dot]devir[at]mykolab[dot]com>
# Contributor: Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>
# Contributor: Tobias Powalowski <tpowa@archlinux.org>
# Contributor: Thomas Baechler <thomas@archlinux.org>

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

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

# 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=

pkgbase=linux-bcachefs-git
_srcver_arch=5.0.6-arch1
pkgver=${_srcver_arch//-/.}
pkgrel=1
arch=(x86_64)
url="https://evilpiepirate.org/git/"
license=(GPL2)
makedepends=(xmlto kmod inetutils bc libelf git python-sphinx graphviz)
options=('!strip')
_gcc_more_v='20180509'
_srcname=bcachefs
source=(
    "$_srcname::git+https://github.com/koverstreet/bcachefs#branch=master"
    "enable_additional_cpu_optimizations-$_gcc_more_v.tar.gz::https://github.com/graysky2/kernel_gcc_patch/archive/$_gcc_more_v.tar.gz" # enable_additional_cpu_optimizations_for_gcc
    config         # the main kernel config file
    60-linux.hook  # pacman hook for depmod
    90-linux.hook  # pacman hook for initramfs regeneration
    linux.preset   # standard config files for mkinitcpio ramdisk
)
validpgpkeys=(
    'ABAF11C65A2970B130ABE3C479BE3E4300411886'  # Linus Torvalds
    '647F28654894E3BD457199BE38DBBDC86092693E'  # Greg Kroah-Hartman
)
sha256sums=('SKIP'
            '226e30068ea0fecdb22f337391385701996bfbdba37cdcf0f1dbf55f1080542d'
            'dc3293984d8d7a6a9fea503d8e4768a2397f6924ec2a79f0a2f6ad8117132ea5'
            'ae2e95db94ef7176207c690224169594d49445e04249d2499e9d2fbc117a0b21'
            'c043f3033bb781e2688794a59f6d1f7ed49ef9b13eb77ff9a425df33a244a636'
            'ad6344badc91ad0630caacde83f7f9b97276f80d26a20619a87952be65492c65')

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

prepare() {
    cd $_srcname

    msg2 "Adding patches from Arch Linux kernel repository..."
    git remote add arch_stable https://git.archlinux.org/linux.git
    git pull --no-edit arch_stable v$_srcver_arch
    
    msg2 "Reverting 'block: remove the unused bio_iov_iter_get_pages export' which causes 'make modules' to fail"
    git revert --no-edit 0374e1132217711bc2e920cde877dd7fc3dbd2d9

    # https://github.com/graysky2/kernel_gcc_patch
    msg2 "Patching to enabled additional gcc CPU optimizatons..."
    patch -Np1 -i "$srcdir/kernel_gcc_patch-$_gcc_more_v/enable_additional_cpu_optimizations_for_gcc_v8.1+_kernel_v4.13+.patch"

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

    local src
    for src in "${source[@]}"; do
        src="${src%%::*}"
        src="${src##*/}"
        [[ $src = *.patch ]] || continue
        msg2 "Applying patch $src..."
        patch -Np1 < "../$src"
    done

    msg2 "Setting config..."
    cp ../config .config

    if [ -n "$_subarch" ]; then
        yes "$_subarch" | make oldconfig
    else
        make prepare
    fi

    ### Optionally load needed modules for the make localmodconfig
    # See https://aur.archlinux.org/packages/modprobed-db
        if [ -n "$_localmodcfg" ]; then
            msg "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

    # do not run `make olddefconfig` as it sets default options
    yes "" | make config >/dev/null

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

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

    # save configuration for later reuse
    cat .config > "${startdir}/config.last"
}

build() {
    cd $_srcname
    make bzImage modules htmldocs
}

_package() {
    pkgdesc="The ${pkgbase/linux/Linux} kernel and modules"
    depends=(coreutils linux-firmware kmod mkinitcpio bcachefs-tools)
    optdepends=('crda: to set the correct wireless channels of your country')
    backup=("etc/mkinitcpio.d/$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"

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

_package-headers() {
    pkgdesc="Header files and scripts for building modules for ${pkgbase/linux/Linux} kernel"
    provides=("linux-bcachefs-headers=${pkgver}" "linux-headers=${pkgver}")

    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"
}

_package-docs() {
    pkgdesc="Kernel hackers manual - HTML documentation that comes with the ${pkgbase/linux/Linux} kernel"
    provides=("linux-bcachefs-docs=${pkgver}" "linux-docs=${pkgver}")

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

    cd $_srcname

    msg2 "Installing documentation..."
    mkdir -p "$builddir"
    cp -t "$builddir" -a Documentation

    msg2 "Removing doctrees..."
    rm -r "$builddir/Documentation/output/.doctrees"

    msg2 "Moving HTML docs..."
    local src dst
    while read -rd '' src; do
        dst="$builddir/Documentation/${src#$builddir/Documentation/output/}"
        mkdir -p "${dst%/*}"
        mv "$src" "$dst"
        rmdir -p --ignore-fail-on-non-empty "${src%/*}"
    done < <(find "$builddir/Documentation/output" -type f -print0)

    msg2 "Adding symlink..."
    mkdir -p "$pkgdir/usr/share/doc"
    ln -sr "$builddir/Documentation" "$pkgdir/usr/share/doc/$pkgbase"

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

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

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