# vim: set syn=sh:
#Maintainer: JRD <jrd@enialis.net>
# Use fake-uname to match the kernel version you want to compile

KVER=$(uname -r)
pkgname=kernelive
pkgver=$(echo $KVER|tr - .)
pkgrel=1cp
#arch=noarch
source=(config-$KVER.live config-$KVER.live.patch aufs2-standalone-$(echo $KVER|sed 's/\([^.]*\.[^.]*\.[^.]*\)\..*/\1/').tar.gz modules.conf 01-Squashfs-Move_zlib_decompression_wrapper_code_into_a_separate_file.patch 02-Squashfs-Factor_out_remaining_zlib_dependencies_into_separate_wrapper_file.patch 03-Squashfs-Add_a_decompressor_framework.patch 04-Squashfs-Add_decompressor_entries_for_lzma_and_lzo.patch 05-Squashfs-Add_support_for_LZMA_compressed_filesystems.patch 06-lzma-Make_lzma_available_to_non_initramfs_initrd_code.patch 07-Squashfs-Select_DECOMPRESS_LZMA_NEEDED_when_including_support_for_lzma.patch 08-lzma-Make_lzma_reentrant.patch)
sourcetemplate=http://enialis.net/~jrd/salix/$pkgname/$pkgver-\$arch-$pkgrel/
docs=("INFOS" "readme" "copying")

slackdesc=\
(
#|-----handy-ruler------------------------------------------------------|
"$pkgname (Linux kernel for Salix Live)"
"Linux kernel for Salix Live is compiled with support for"
"squashfs, lzma & aufs2 as well as for most hardware, "
"including SCSI, USB booting devices, etc.. "
""
"This is the same kernel config as kernel-huge but with aufs2 FS and"
"squashfs+lzma FS patches."
)


build() {
  export KVEREXTRA=$(uname -r)
  export KVER=$(echo $KVEREXTRA|sed 's/\(.*\)-.*/\1/')
  export SRC=$startdir/src
  export DEST=$startdir/pkg
  export nbthreads=$(cat /proc/cpuinfo | grep ^processor | wc -l)
  # clone the kernel
  echo '########################################'
  echo "Cloning /usr/src/linux-$KVER..."
  echo '########################################'
  cp -a /usr/src/linux-$KVER $SRC/linuxsrc || exit 1
  (
    ARCH_BAK=$ARCH
    [ "$ARCH" = "i486" ] && ARCH=x86
    cd $SRC/linuxsrc
    # clean the kernel
    make mrproper || exit 1
    # patch the kernel to use a new FS : aufs (an unionfs like filesystem)
    echo '* Applying aufs2-kbuild.patch... *'
    patch -p1 < $SRC/aufs2-standalone/aufs2-kbuild.patch || exit 1
    echo '* Applying aufs2-base.patch... *'
    patch -p1 < $SRC/aufs2-standalone/aufs2-base.patch || exit 1
    cp -r $SRC/aufs2-standalone/{Documentation,fs,include} . || exit 1
    # patch the squashfs to use a decompressor wrapper and in particular lzma.
    # patch for lzma to be used outside initrd/initramfs.
    echo '* Applying squashfs-lzam patches... *'
    patch -p1 < $SRC/01-Squashfs-Move_zlib_decompression_wrapper_code_into_a_separate_file.patch || exit 1
    patch -p1 < $SRC/02-Squashfs-Factor_out_remaining_zlib_dependencies_into_separate_wrapper_file.patch || exit 1
    patch -p1 < $SRC/03-Squashfs-Add_a_decompressor_framework.patch || exit 1
    patch -p1 < $SRC/04-Squashfs-Add_decompressor_entries_for_lzma_and_lzo.patch || exit 1
    patch -p1 < $SRC/05-Squashfs-Add_support_for_LZMA_compressed_filesystems.patch || exit 1
    patch -p1 < $SRC/06-lzma-Make_lzma_available_to_non_initramfs_initrd_code.patch || exit 1
    patch -p1 < $SRC/07-Squashfs-Select_DECOMPRESS_LZMA_NEEDED_when_including_support_for_lzma.patch || exit 1
    patch -p1 < $SRC/08-lzma-Make_lzma_reentrant.patch || exit 1
    # use a suitable configuration for live environnement.
    cp $SRC/config-$KVEREXTRA.live .config
    make oldconfig scripts prepare || exit 1
    # compile the kernel (without squashfs for now)
    echo '########################################'
    echo "Compiling modules..."
    echo '########################################'
    make -j $nbthreads modules || exit 1
    echo '########################################'
    echo "Compiling kernel image..."
    echo '########################################'
    make -j $nbthreads bzImage || exit 1
    export INSTALL_MOD_PATH=$DEST
    echo '########################################'
    echo "Installing modules..."
    echo '########################################'
    make modules_install || exit 1
    unset INSTALL_MOD_PATH
    ARCH=$ARCH_BAK
  )
  # copy the kernel
  cd $DEST
  mkdir -p boot
  (
    cd boot
    cp $SRC/linuxsrc/.config config-$KVEREXTRA
    cp $SRC/linuxsrc/System.map System.map-$KVEREXTRA
    cp $SRC/linuxsrc/arch/x86/boot/bzImage vmlinuz-$KVEREXTRA
    ln -s config-$KVEREXTRA config
    ln -s System.map-$KVEREXTRA System.map
    ln -s vmlinuz-$KVEREXTRA vmlinuz
  )
  # create rc.modules
  mkdir -p etc/rc.d
  cat << EOF > etc/rc.d/rc.modules
#!/bin/sh
# rc.modules   $(date) <Generated by kernelive>
#
# This file loads extra drivers into the Linux kernel.
# As kmod and udev handle module loading, this file will be mostly
# commented out, but is still useful for loading selected modules at boot time.
#

RELEASE=\$(uname -r)

echo "Updating module dependencies for Linux \$RELEASE"

/sbin/depmod -A

EOF
  sed -e "s@_ROOT_@$DEST@ ; s/_KVER_/${KVEREXTRA}/" $SRC/modules.conf > $DEST/modules.conf
  export MODULECONF=$DEST/modules.conf
  depmod -a -b $DEST -F $DEST/boot/System.map $KVEREXTRA || exit 1
  modprobe -l | sed -e "s/^.*\/\(.*\)\.ko$/# \/sbin\/modprobe \1/m ; s/# \(.* ac$\)/\1/ ; s/# \(.* battery$\)/\1/ ; s/# \(.* button$\)/\1/ ; s/# \(.* fan$\)/\1/ ; s/# \(.* fuse$\)/\1/ ; s/# \(.* processor$\)/\1/ ; s/# \(.* thermal$\)/\1/ ; s/# \(.* video$\)/\1/ ; s/# \(.* lp$\)/\1/ ; s/# \(.* parport$\)/\1/ ; s/# \(.* parport_pc$\)/\1/ " | sort >> etc/rc.d/rc.modules
  chmod 755 etc/rc.d/rc.modules
  rm -rf $DEST/modules.conf $DEST/persist
  unset MODULECONF
  # copy the kernel source outside the SLKBUILD tree to keep it.
  cp -r $SRC/linuxsrc $startdir/
  # copy files necessary for later builds, like nvidia and vmware
  (
    cd $SRC/linuxsrc
    mkdir -p $DEST/usr/src/linux-$KVER/include
    mkdir -p $DEST/usr/src/linux-$KVER/arch
    for i in acpi asm-generic config drm generated linux math-emu media net pcmcia scsi sound trace video; do
      cp -rf include/$i $DEST/usr/src/linux-$KVER/include/
    done
    cp -rf arch/x86 $DEST/usr/src/linux-$KVER/arch/
    cp -rf scripts Makefile KBuild Module.symvers .config $DEST/usr/src/linux-$KVER/
    # fix permissions on scripts dir
    chmod 755 -R $DEST/usr/src/linux-$KVER/scripts
    # add media/video headers
    mkdir -p $DEST/usr/src/linux-$KVER/drivers/media/video
    for i in $(find drivers/media/video -name "*.h"); do
      mkdir -p $DEST/usr/src/linux-$KVER/$(dirname $i)
      cp $i $DEST/usr/src/linux-$KVER/$i
    done
    # add md headers
    mkdir -p $DEST/usr/src/linux-$KVER/drivers/md
    cp drivers/md/*.h $DEST/usr/src/linux-$KVER/drivers/md
    # add wireless headers
    mkdir -p $DEST/usr/src/linux-$KVER/net/mac80211/
    cp net/mac80211/*.h $DEST/usr/src/linux-$KVER/net/mac80211/
    # add CLUSTERIP file for iptables
    mkdir -p $DEST/usr/src/linux-$KVER/net/ipv4/netfilter/
    cp net/ipv4/netfilter/ipt_CLUSTERIP.c $DEST/usr/src/linux-$KVER/net/ipv4/netfilter/
    # copy Kconfig files
    for i in $(find . -name "Kconfig*"); do
      mkdir -p $DEST/usr/src/linux-$KVER/$(dirname $i)
      cp $i $DEST/usr/src/linux-$KVER/$i
    done
    # delete the kernel binary in the sources
    rm -f $DEST/usr/src/linux-$KVER/arch/x86/boot/compressed/vmlinux $DEST/usr/src/linux-$KVER/arch/x86/boot/compressed/vmlinux.bin* $DEST/usr/src/linux-$KVER/arch/x86/boot/vmlinux.bin $DEST/usr/src/linux-$KVER/arch/x86/boot/bzImage
    # delete all .o files
    for i in $(find $DEST/usr/src/linux-$KVER -name '*.o'); do
      rm -f $i
    done
  )
  # fix build and source link in /lib/modules/XXX/
  (
    cd $DEST/lib/modules/$KVEREXTRA/
    rm -f build && ln -s /usr/src/linux-$KVER build
    rm -f source && ln -s /usr/src/linux-$KVER source
  )
}