#Maintainer: JRD <jrd@salixos.org>
# vim: set syn=sh ft=sh et sw=2 sts=2 ts=2 tw=0:

_kver=3.10.17
_aufscommit=ce9cff
pkgname=kernelive
pkgver=$(echo $_kver|tr - .)
pkgrel=1cp
_configname=config-huge$(uname -m|grep -q 64 || echo '-smp')-$_kver$(uname -m|grep -q 64 && echo '.x64' || echo '-smp').live
source=(https://www.kernel.org/pub/linux/kernel/v3.x/linux-$_kver.tar.xz CVE-2004-0038.diff $_configname.xz $_configname.patch aufs3-standalone-$_aufscommit.tar.xz)
sourcetemplate=http://people.salixos.org/jrd/salix/$pkgname/$pkgver-\$arch-$pkgrel/
docs=("readme" "copying")
options=('nostrip')

slackdesc=\
(
#|-----handy-ruler------------------------------------------------------|
"$pkgname (Linux kernel for Salix Live)"
"Linux kernel for Salix Live is compiled with support for"
"squashfs, xz & aufs3 as well as for most hardware, "
"including SCSI, USB booting devices, etc.. "
""
"This is the same kernel config as kernel-huge but with aufs3 FS patch."
)

build() {
  export KVER=$_kver
  export KVEREXTRA=$KVER$(uname -m|grep -q 64 || echo '-smp')
  mv $SRC/linux-$KVER $SRC/linuxsrc
  ARCH_BAK=$ARCH
  unset ARCH
  cd $SRC/linuxsrc
  echo '* Applying CVE-2004-0038.diff... *'
  patch -p1 -i $SRC/CVE-2004-0038.diff || exit 1
  # patch the kernel to use a new FS : aufs (an unionfs like filesystem)
  for f in Documentation fs include/uapi/linux/aufs_type.h; do
    mkdir -p $(dirname $f) || exit 1
    cp -r $SRC/aufs3-standalone-$_aufscommit/$f $(dirname $f)/ || exit 1
  done
  echo '* Applying aufs3-kbuild.patch... *'
  patch -p1 -i $SRC/aufs3-standalone-$_aufscommit/aufs3-kbuild.patch || exit 1
  echo '* Applying aufs3-base.patch... *'
  patch -p1 -i $SRC/aufs3-standalone-$_aufscommit/aufs3-base.patch || exit 1
  echo '* Applying aufs3-mmap.patch... *'
  # mm/freemap.c has been changed and the patch for it cannot be applied.
  # So patch it with sed and remove the patch chunk from the patch file
  sed -ri "/mmap_region/ {
    i \
			vma_get_file(vma);
    N;
    a \
			vma_fput(vma);
    }" mm/fremap.c || exit 1
  sed -ri '\:^diff --git a/mm/fremap.c:,+13 d' $SRC/aufs3-standalone-$_aufscommit/aufs3-mmap.patch || exit 1
  patch -p1 -i $SRC/aufs3-standalone-$_aufscommit/aufs3-mmap.patch || exit 1
  # use a suitable configuration for live environnement.
  cp $SRC/$_configname .config || exit 1
  make oldconfig scripts prepare || exit 1
  # compile the kernel
  echo '########################################'
  echo "Compiling modules..."
  echo '########################################'
  make -j $numjobs modules || exit 1
  echo '########################################'
  echo "Compiling kernel image..."
  echo '########################################'
  make -j $numjobs bzImage || exit 1
  export INSTALL_MOD_PATH=$PKG
  echo '########################################'
  echo "Installing modules..."
  echo '########################################'
  make -j $numjobs modules_install || exit 1
  unset INSTALL_MOD_PATH
  ARCH=$ARCH_BAK
  # copy the kernel
  cd $PKG
  mkdir -p boot
  (
    cd boot
    cp $SRC/linuxsrc/.config config-huge-$KVEREXTRA
    cp $SRC/linuxsrc/System.map System.map-huge-$KVEREXTRA
    cp $SRC/linuxsrc/arch/x86/boot/bzImage vmlinuz-huge-$KVEREXTRA
    ln -s config-huge-$KVEREXTRA config
    ln -s System.map-huge-$KVEREXTRA System.map
    ln -s vmlinuz-huge-$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>
#
RELEASE=\$(uname -r)
echo "Updating module dependencies for Linux \$RELEASE:"
/sbin/depmod -A
#### ACPI support ###
EOF
  modules_enabled="fuse ac battery button video fan dock bay processor thermal memory asus_acpi thinkpad_acpi toshiba_acpi pcspkr parport_pc lp agpgart"
  for m in $(find $PKG/lib/modules/$KVEREXTRA -name '*.ko' -exec basename '{}' .ko \;|sort); do
    if echo " $modules_enabled "|grep -q " $m "; then
      echo "/sbin/modprobe -q $m >/dev/null 2>&1" >> etc/rc.d/rc.modules
    else
      echo "# /bin/modprobe $m" >> etc/rc.d/rc.modules
    fi
  done
  cat << 'EOF' >> etc/rc.d/rc.modules
### Filesystem Quota support ###
if /bin/grep -q quota /etc/fstab ; then
  # /sbin/modprobe quota_v1
  /sbin/modprobe quota_v2
fi
### Network device support ###
# Most of these drivers will probe automatically for the card if you don't
# specify an I/O address and IRQ.  
#
# First, if setup probing found a network card, there may be an 'rc.netdevice'
# file that we should run to load the network module:
if [ -x /etc/rc.d/rc.netdevice ]; then
  . /etc/rc.d/rc.netdevice
fi
### CPU frequency scaling support
#
# Below, set CPUFREQ to enable CPU frequency scaling to save system power.
#
# To always try to use CPU frequency scaling, set to:  on
# To never use CPU frequency scaling, set to:  off
# To use it only when the battery module is loaded (this will cause it to
# be used by default with most laptops), set to:  battery
#
CPUFREQ=battery

# If CPUFREQ=battery and the battery module is loaded, turn on CPUfreq.
if [ "$CPUFREQ" = "battery" ]; then
  if /sbin/lsmod | grep -wq battery ; then
    # CPUFREQ=battery and a battery was detected, so change CPUFREQ
    # to 'on' so that the block of script below will try to enable it.
    CPUFREQ=on
  fi
fi

### Enable CPU frequency scaling if requested:
if [ "$CPUFREQ" = "on" ]; then
  ### CPU frequency scaling modules for the Linux kernel CPUfreq subsystem.
  #
  # Clock scaling allows you to change the clock speed of the CPUs on the fly.
  # This is a nice method to save battery power, because the lower the clock
  # speed is, the less power the CPU consumes.
  # 
  # It should not hurt anything to try to load these modules.
  #
  # generic ACPI P-States based driver:
  /sbin/modprobe acpi-cpufreq 2>/dev/null
  # AMD mobile K6-2/3+ PowerNow!:
  /sbin/modprobe powernow-k6 2>/dev/null
  # AMD mobile Athlon PowerNow!:
  /sbin/modprobe powernow-k7 2>/dev/null
  # AMD Cool&Quiet PowerNow!:
  /sbin/modprobe powernow-k8 2>/dev/null
  # Intel SpeedStep using the SMI BIOS interface:
  /sbin/modprobe speedstep-smi 2>/dev/null
  # Intel SpeedStep on ICH-based chipsets:
  /sbin/modprobe speedstep-ich 2>/dev/null
  # Intel Enhanced SpeedStep :
  /sbin/modprobe speedstep-centrino 2>/dev/null
  # Intel Pentium4/Xeon clock modulation is not enabled by default.
  # The kernel documentation says "This adds the CPUFreq driver for Intel
  # Pentium 4 / XEON processors.  When enabled it will lower CPU temperature
  # by skipping clocks.  This driver should be only used in exceptional
  # circumstances when very low power is needed because it causes severe
  # slowdowns and noticeable latencies.  Normally Speedstep should be used
  # instead."
  # If you still want to try the Pentium4/Xeon module, uncomment the next line:
  #/sbin/modprobe p4-clockmod 2>/dev/null
  # NatSemi Geode GX / Cyrix MediaGXm:
  /sbin/modprobe gx-suspmod  2>/dev/null
  # Transmeta Crusoe / Efficeon LongRun:
  /sbin/modprobe longrun  2>/dev/null
  # VIA Cyrix Longhaul:
  /sbin/modprobe longhaul  2>/dev/null
  # nForce2 FSB changing cpufreq driver:
  /sbin/modprobe cpufreq-nforce2 2>/dev/null
  # Enhanced PowerSaver driver for VIA C7 CPUs:
  /sbin/modprobe e_powersaver 2>/dev/null

  ### CPU frequency scaling policies:
  #
  # Use the CPUFreq governor 'powersave' as default.  This sets the
  # frequency statically to the lowest frequency supported by the CPU.
  #/sbin/modprobe cpufreq_powersave
  #
  # Use the CPUFreq governor 'performance' as default. This sets the
  # frequency statically to the highest frequency supported by the CPU.
  #/sbin/modprobe cpufreq_performance
  #
  # Use the CPUFreq governor 'conservative' as default.  This allows you
  # to get a full dynamic frequency capable system by simply loading your
  # cpufreq low-level hardware driver.  Be aware that not all cpufreq
  # drivers support the 'conservative' governor -- the fallback governor
  # will be the 'performance' governor.
  #/sbin/modprobe cpufreq_conservative
  #
  # Use the CPUFreq governor 'ondemand' as default.  This allows you to
  # get a full dynamic frequency capable system by simply loading your
  # cpufreq low-level hardware driver.  Be aware that not all cpufreq
  # drivers support the 'ondemand' governor -- the fallback governor will
  # be the performance governor.  This seems to be the most-recommended
  # scaling policy, so rc.modules will try to load this by default.
  /sbin/modprobe cpufreq_ondemand 2>/dev/null

  ### CPU scaling governor:
  #
  # Set the default scaling_governor to be used (such as userspace or ondemand)
  # if there is a CPUFreq scaling policy module loaded that supports it:
  SCALING_GOVERNOR=ondemand
  #
  # Try to enable the scaling_governor selected above:
  if [ -r /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors ]; then
    if grep -wq "$SCALING_GOVERNOR" /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors ; then
      if [ -r /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor ]; then
        for SYSCPUFILE in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor ; do
          echo "$SCALING_GOVERNOR" > $SYSCPUFILE
        done
      fi
    fi
  fi

fi # End enabling CPU scaling support

# We are done with these variables now:
unset NEWMODS RELEASE CPUFREQ SCALING_GOVERNOR SYSCPUFILE
EOF



  cat <<'EOF' >> etc/rc.d/rc.modules
#!/bin/sh
RELEASE=\$(uname -r)
if [ -x /usr/bin/find -a -e /lib/modules/$RELEASE/modules.dep \
     -a /lib/modules/$RELEASE/modules.dep -nt /etc/modules.conf ]; then
  NEWMODS="$(/usr/bin/find /lib/modules/$RELEASE -mindepth 2 -type f -newer /lib/modules/$RELEASE/modules.dep)"
  # Only rebuild dependencies if new module(s) are found:
  if [ ! "" = "$NEWMODS" ]; then
    echo "Updating module dependencies for Linux $RELEASE:"
    /sbin/depmod -a
  else
    echo "Module dependencies up to date (no new kernel modules found)."
  fi
else # we don't have find, or there is no existing modules.dep, or it is out of date.
  echo "Updating module dependencies for Linux $RELEASE:"
  /sbin/depmod -A
fi
EOF
  modules_enabled="fuse ac battery button video fan dock bay processor thermal asus_acpi thinkpad_acpi toshiba_acpi parport_pc lp agpgart"
  find $PKG/lib/modules/$KVER -name '*.ko' | sed "s,$PKG/lib/modules/$KVER/,," | sed -e 's,^.*/\([^/]*\)\.ko$,# /sbin/modprobe \1,; s,# \(.*\) \('"$(echo "$modules_enabled"|sed 's/ /\\|/g')"'\)$,\1 -q \2,;' | sort >> etc/rc.d/rc.modules
  cat << 'EOF' >> etc/rc.d/rc.modules
### Filesystem Quota support ###
if /bin/grep -q quota /etc/fstab ; then
  # /sbin/modprobe quota_v1
  /sbin/modprobe quota_v2
fi
### Network device support ###
# Most of these drivers will probe automatically for the card if you don't
# specify an I/O address and IRQ.  
#
# First, if setup probing found a network card, there may be an 'rc.netdevice'
# file that we should run to load the network module:
if [ -x /etc/rc.d/rc.netdevice ]; then
  . /etc/rc.d/rc.netdevice
fi
### CPU frequency scaling support
#
# Below, set CPUFREQ to enable CPU frequency scaling to save system power.
#
# To always try to use CPU frequency scaling, set to:  on
# To never use CPU frequency scaling, set to:  off
# To use it only when the battery module is loaded (this will cause it to
# be used by default with most laptops), set to:  battery
#
CPUFREQ=on

EOF
  /sbin/depmod -a -b $PKG -F $PKG/boot/System.map $KVEREXTRA || exit 1
  find $PKG/lib/modules/$KVEREXTRA -name '*.ko' -exec basename '{}' .ko \; | sort | sed 's,.*,# /sbin/modprobe -q &,' >> etc/rc.d/rc.modules
  for m in ac agpgart battery button fan fuse lp parport parport_pc processor thermal video acpi-cpufreq powernow-k6 powernow-k7 powernow-k8 speedstep-smi speedstep-ich speedstep-centrino gx-suspmod longrun longhaul cpufreq-nforce2 e_powersaver cpufreq_ondemand; do
    sed -ri 's,# (.* '$m'$),\1 2>/dev/null,' etc/rc.d/rc.modules
  done
  cat << 'EOF' >> etc/rc.d/rc.modules

SCALING_GOVERNOR=ondemand
# Try to enable the scaling_governor selected above:
if [ -r /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors ]; then
  if grep -wq "$SCALING_GOVERNOR" /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors ; then
    if [ -r /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor ]; then
      for SYSCPUFILE in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor ; do
        echo "$SCALING_GOVERNOR" > $SYSCPUFILE
      done
    fi
  fi
fi
EOF
  chmod 755 etc/rc.d/rc.modules
  # copy files necessary for later builds, like nvidia, ati, vbox and vmware
  (
    cd $SRC/linuxsrc
    mkdir -p $PKG/usr/src/linux-$KVER/include
    mkdir -p $PKG/usr/src/linux-$KVER/arch
    for i in acpi asm-generic config drm generated linux math-emu media net pcmcia scsi sound trace video xen; do
      cp -rf include/$i $PKG/usr/src/linux-$KVER/include/
    done
    cp -rf arch/x86 $PKG/usr/src/linux-$KVER/arch/
    cp -rf scripts Makefile Kbuild Module.symvers .config $PKG/usr/src/linux-$KVER/
    # fix permissions on scripts dir
    chmod 755 -R $PKG/usr/src/linux-$KVER/scripts
    # add video headers
    mkdir -p $PKG/usr/src/linux-$KVER/drivers/video
    for i in $(find drivers/video -name "*.h"); do
      mkdir -p $PKG/usr/src/linux-$KVER/$(dirname $i)
      cp $i $PKG/usr/src/linux-$KVER/$i
    done
    # add md headers
    mkdir -p $PKG/usr/src/linux-$KVER/drivers/md
    cp drivers/md/*.h $PKG/usr/src/linux-$KVER/drivers/md
    # add wireless headers
    mkdir -p $PKG/usr/src/linux-$KVER/net/mac80211/
    cp net/mac80211/*.h $PKG/usr/src/linux-$KVER/net/mac80211/
    # add CLUSTERIP file for iptables
    mkdir -p $PKG/usr/src/linux-$KVER/net/ipv4/netfilter/
    cp net/ipv4/netfilter/ipt_CLUSTERIP.c $PKG/usr/src/linux-$KVER/net/ipv4/netfilter/
    # copy Kconfig files
    for i in $(find . -name "Kconfig*"); do
      mkdir -p $PKG/usr/src/linux-$KVER/$(dirname $i)
      cp $i $PKG/usr/src/linux-$KVER/$i
    done
    # delete the kernel binary in the sources
    rm -f $PKG/usr/src/linux-$KVER/arch/x86/boot/compressed/vmlinux $PKG/usr/src/linux-$KVER/arch/x86/boot/compressed/vmlinux.bin* $PKG/usr/src/linux-$KVER/arch/x86/boot/vmlinux.bin $PKG/usr/src/linux-$KVER/arch/x86/boot/bzImage
    # delete all .o files
    for i in $(find $PKG/usr/src/linux-$KVER -name '*.o'); do
      rm -f $i
    done
  )
  # fix build and source link in /lib/modules/XXX/
  (
    cd $PKG/lib/modules/$KVEREXTRA/
    rm -f build && ln -s /usr/src/linux-$KVER build
    rm -f source && ln -s /usr/src/linux-$KVER source
  )
}