# Maintainer: N Fytilis (nicman23) n-fit[@]live[.]com
# Contributor: Kyle De'Vir (QuartzDragon) <kyle[dot]devir[at]mykolab[dot]com>
# Contributor: Jan Alexander Steffens (heftig) <heftig@archlinux.org>

#################################################################################
# Because the package needs to download 2 linux gits to accelerate the progress
# do not let makepkg fetch them on its own. ( hint: uncomment the lines :) )
# git clone https://github.com/koverstreet/bcachefs \
#  -b master --bare linux-bcachefs # use --reference if you already got a linux git in ../linux
# and:
# git clone https://github.com/zen-kernel/zen-kernel \
#  -b 5.10/master --bare --reference linux-bcachefs linux-zen
#
# git clone https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git \
#  -b linux-5.10.y --bare --reference linux-zen linux-stable
#################################################################################

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

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

# Compile ONLY used modules to VASTLY reduce the number of modules built
# and the build time.
#
# 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 read the database kept if it exists
#
# More at this wiki page ---> https://wiki.archlinux.org/index.php/Modprobed-db
_localmodcfg=

pkgbase=linux-bcachefs-510-zen
pkgver=v5.10.26.arch1.r971595.17f9d1e225b9
_srcver_tag=v5.10.26.arch1
pkgrel=1
pkgdesc="Linux"
url="https://github.com/koverstreet/bcachefs"
arch=(x86_64)
license=(GPL2)
makedepends=(
    bc
    kmod
    libelf
    pahole
    cpio
    perl
    tar
    xz
    xmlto
    git
)
options=('!strip')

_reponame="linux-bcachefs"

_pkgdesc_extra="~ featuring Kent Overstreet's bcachefs filesystem"

source=(
    "${_reponame}::git+https://github.com/koverstreet/bcachefs"
    'linux-zen::git+https://github.com/zen-kernel/zen-kernel#branch=5.10/master'
    'linux-stable::git+https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git#branch=linux-5.10.y'
    config # kernel config file
)
validpgpkeys=(
    "ABAF11C65A2970B130ABE3C479BE3E4300411886"  # Linus Torvalds
    "647F28654894E3BD457199BE38DBBDC86092693E"  # Greg Kroah-Hartman
)
md5sums=('SKIP'
         'SKIP'
         'SKIP'
         'SKIP'
)

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

prepare() {
    cd "$srcdir/$_reponame"

    git remote add zen ../linux-zen || {
      cd "$srcdir"
      rm -rf linux-bcachefs
      git clone ../linux-bcachefs linux-bcachefs
      cd -
      git remote add zen ../linux-zen
    }

    git remote add stable ../linux-stable
    EDITOR=true git pull zen makepkg
    EDITOR=true git pull stable makepkg ||
     git checkout --theirs Makefile

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

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

    make prepare

    ### Optionally load needed modules for the make localmodconfig
    # See https://aur.archlinux.org/packages/modprobed-db
    if [ -n "$_localmodcfg" ]; then
        if [ -f $HOME/.config/modprobed.db ]; then
            msg2 "Running Steven Rostedt's make localmodconfig now"
            make LSMOD=$HOME/.config/modprobed.db localmodconfig
        else
            msg2 "No modprobed.db data found"
            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 $pkgbase version $(<version)"

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

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

pkgver() {
    cd "$srcdir/$_reponame"
    printf "%s.r%s.%s" "${_srcver_tag//-/.}" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"
}

build() {
    cd $_reponame
    make all
}

_package() {
    pkgdesc="The $pkgdesc kernel and modules $_pkgdesc_extra"
    depends=(
        coreutils
        kmod
        initramfs
        linux-firmware
        bcachefs-tools-git
    )
    optdepends=(
        "crda: to set the correct wireless channels of your country"
    )
    provides=(
        VIRTUALBOX-GUEST-MODULES
        WIREGUARD-MODULE
    )
    replaces=(
        virtualbox-guest-modules-arch
        wireguard-arch
    )

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

    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"

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

    msg2 "Installing modules..."
    make INSTALL_MOD_PATH="$pkgdir/usr" INSTALL_MOD_STRIP=1 modules_install

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

_package-headers() {
    pkgdesc="Headers and scripts for building modules for the $pkgdesc kernel $_pkgdesc_extra"
    depends=(pahole)

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

    msg2 "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 "$builddir/arch/x86" -m644 arch/x86/Makefile
    cp -t "$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}

    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)

    echo "Stripping vmlinux..."
    strip -v $STRIP_STATIC "$builddir/vmlinux"

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

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