# Maintainer: Sébastien Luttringer <seblu@aur.archlinux.org>
# Customized version of linux for seblu computers

shopt -s nullglob

# WARNING:
# Always use 3 dot versionning here! (e.g: 3.11.0, not 3.11)
# Althought tarball release are not nammed with the third number, the kernel
# built version contains it. Thus, modules and identifiers are with the last 0.
kernelver=3.11-rc6
kernelsuf=-seblu
pkgname=linux
pkgver=1
pkgrel=1
arch=('x86_64')
license=('GPL2')
url='http://www.kernel.org'
options=('!strip')
makedepends=('kmod' 'bc' 'xmlto' 'docbook-xsl')
source=("config.$CARCH.$kernelver")
md5sums=('SKIP')

# major kernel version (first number)
kernelmaj=${kernelver%%.*}
# base url for kernel related tarballs (full, patch, etc)
kernelurl="https://www.kernel.org/pub/linux/kernel/v$kernelmaj.x"

# here we have a Linus kernel
if [[ $kernelver =~ $kernelmaj\.[[:digit:]]+\.0 ]]; then
  # kernel base is the version of the full kernel tarball to download
  kernelbase=${kernelver%.0}
# here we have a Linus rc kernel
elif [[ $kernelver =~ -rc ]]; then
  kernelbase=${kernelver%-rc*}
  kernelbase=$kernelmaj.$((${kernelbase#*.} - 1))
  patchurl="testing/patch-$kernelver.xz"
# here we have stable kernel schema (probably Greg)
elif [[ $kernelver =~ $kernelmaj\.[[:digit:]]+\.[[:digit:]]+ ]]; then
  # kernel base is the version of the full kernel tarball to download
  kernelbase=${kernelver%.*}
  patchurl="patch-$kernelver.xz"
else
  # we are in error, probably the last version number is not here
  error "Invalid kernel number: $kernelver, read warning before \$kernelver!"
  exit 2
fi

# adding base kernel to sources
# we doesn't use .sign as kernel.org provide only .sign for raw tarball (no xz)
# makepkg doesn't handle this correctly
source+=("$kernelurl/linux-$kernelbase.tar.xz")
md5sums+=('SKIP')

# adding patch to sources
if [[ -n $patchurl ]]; then
  source+=("$kernelurl/$patchurl")
  md5sums+=('SKIP')
fi

# we can now guess real package name. Useful to avoid overwrite
pkgname=$pkgname$kernelsuf-$kernelver

# small hack to avoid makepkg to check checksum
#SKIPCHECKSUMS=1

# Because kernel compilation is heavy IO process we are nice people
_nice='nice -n 19'

prepare() {
  # priorize upstream patch
  if [[ -e patch-$kernelver ]]; then
    ln -sf patch-$kernelver 00-patch-$kernelver.patch
  fi

  # apply patches
  cd linux-$kernelbase
  for _f in "$srcdir"/*.patch; do
    [[ -r "$_f" ]] || continue
    msg2 "Applying patch: ${_f##*/}"
    $_nice patch -N -p1 -i "$_f"
  done

	# loading default config
  # use make localmodconfig to check .config is correct
  msg2 'Copying config'
  install "$srcdir/config.$CARCH.$kernelver" .config

	# removing last dot if zero
	#sed -ri 's/^SUBLEVEL = 0$/SUBLEVEL =/' Makefile

	# force suffixe in config (must be the right!)
	msg2 'Setting kernel suffix'
	sed -i "s|CONFIG_LOCALVERSION=.*|CONFIG_LOCALVERSION=\"$kernelsuf\"|g" .config
}

build() {
  msg2 "Kernel version: $kernelver"
  msg2 "Kernel suffix: $kernelsuf"

  cd linux-$kernelbase

  # define current build version
  echo $((pkgver - 1)) > .version

  # Preapre compilation
  msg2 'Preparing compilation'
  yes '' | $_nice make config &>/dev/null
  $_nice make prepare &>/dev/null

  # Compiling sources
  msg2 'Compiling'
  $_nice make bzImage modules
}

package() {
  cd linux-$kernelbase
  # get real compiled kernel version
  compver=$(make kernelrelease)
  pkgdesc="The Linux Kernel, version $compver"
  provides=("linux=$kernelver" "linux-headers=$kernelver" "linux-docs=$kernelver")
  depends=('coreutils' 'linux-firmware' 'kmod' 'mkinitcpio')
  install='install'

  sed -ri "s/pkgname=.*/pkgname='$pkgname'/" "$startdir/$install"

  # installing modules
  # disable DEPMOD because it fail due to poor hack in scripts/depmod.sh
  $_nice make INSTALL_MOD_PATH="$pkgdir/usr" DEPMOD=/bin/true modules_install

  # do manual depmod call
  $_nice depmod -b "$pkgdir/usr" -- "$compver"

  # install kernel and map
  $_nice install -D -m644 arch/x86/boot/bzImage "$pkgdir/boot/vmlinuz-$compver"

  # install mkinitcpio preset file for kernel
  install -d "$pkgdir/etc/mkinitcpio.d/"
  cat > "$pkgdir/etc/mkinitcpio.d/$pkgname.preset" << EOF
# mkinitcpio preset file for $pkgname

ALL_config="/etc/mkinitcpio.conf"
ALL_kver="/boot/vmlinuz-$compver"

PRESETS=('default' 'fallback')

#default_config="/etc/mkinitcpio.conf"
default_image="/boot/initramfs-$compver.img"
#default_options=""

#fallback_config="/etc/mkinitcpio.conf"
fallback_image="/boot/initramfs-$compver-fallback.img"
fallback_options="-S autodetect"
EOF

  # setup current version package (used by install script)
  install -d "$pkgdir/usr/share/$pkgname"
  cat > "$pkgdir/usr/share/$pkgname/info" << EOF
KERNEL_NAME=$pkgname
KERNEL_VERSION=$kernelver
KERNEL_SUFFIX=$kernelsuf
KERNEL_BUILD=$compver
EOF

  # remove build and source links
  rm -f "$pkgdir/usr/lib/modules/$compver"/{source,build}

  # remove the firmware (avoiding conflict with 2.6
  rm -rf "$pkgdir/usr/lib/firmware"

  # copy documentation
  install -d "$pkgdir/usr/src/linux-$compver"
  $_nice cp -r Documentation "$pkgdir/usr/src/linux-$compver"

  # copy headers
  copy_headers

  # check rights
  chown -R root.root "$pkgdir/usr/src/linux-$compver"
  chmod -R u=rwX,go=rX "$pkgdir/usr/src/linux-$compver"

  # gzip -9 all modules to safe 100MB of space
  msg2 'Gzip modules harder'
  $_nice find "$pkgdir" -name '*.ko' -exec gzip -9 {} \;
}

copy_headers() {
  # create build symlink into /usr/lib/modules
  ln -sf ../../../src/linux-$compver "$pkgdir/usr/lib/modules/$compver/build"

  # Copy kernel config files
  cd "$srcdir/linux-$kernelbase"
  install -D -m644 Makefile "$pkgdir/usr/src/linux-$compver/Makefile"
  install -D -m644 kernel/Makefile "$pkgdir/usr/src/linux-$compver/kernel/Makefile"
  install -D -m644 .config "$pkgdir/usr/src/linux-$compver/.config"
  for i in localversion*; do
    install -m644 "$i" "$pkgdir/usr/src/linux-$compver/$i"
  done

  # create include directory
  install -d "$pkgdir/usr/src/linux-$compver/include"

  for i in acpi asm-generic config crypto drm generated linux math-emu \
    media net pcmcia scsi sound trace uapi video xen; do
    cp -a include/$i "$pkgdir/usr/src/linux-$compver/include/"
  done

  # copy arch includes for external modules
  install -d "$pkgdir/usr/src/linux-$compver/arch/x86"
  cp -a arch/x86/include "$pkgdir/usr/src/linux-$compver/arch/x86/"

  # copy files necessary for later builds, like nvidia and vmware
  cp Module.symvers "$pkgdir/usr/src/linux-$compver"
  cp -a scripts "$pkgdir/usr/src/linux-$compver"

  # fix permissions on scripts dir
  chmod og-w -R "$pkgdir/usr/src/linux-$compver/scripts"
  install -d "$pkgdir/usr/src/linux-$compver/.tmp_versions"

  install -d "$pkgdir/usr/src/linux-$compver/arch/x86/kernel"

  cp arch/x86/Makefile "$pkgdir/usr/src/linux-$compver/arch/x86/"
  cp arch/x86/kernel/asm-offsets.s "$pkgdir/usr/src/linux-$compver/arch/x86/kernel/"

  # add headers for lirc package
  # pci
  for i in bt8xx cx88 saa7134; do
    install -d "$pkgdir/usr/src/linux-$compver/drivers/media/pci/$i"
    cp -a drivers/media/pci/$i/*.h "$pkgdir/usr/src/linux-$compver/drivers/media/pci/$i"
  done
  # usb
  for i in cpia2 em28xx pwc sn9c102; do
    install -d "$pkgdir/usr/src/linux-$compver/drivers/media/usb/$i"
    cp -a drivers/media/usb/$i/*.h "$pkgdir/usr/src/linux-$compver/drivers/media/usb/$i"
  done
  # i2c
  mkdir -p "$pkgdir/usr/src/linux-$compver/drivers/media/i2c"
  cp drivers/media/i2c/*.h  "$pkgdir/usr/src/linux-$compver/drivers/media/i2c/"
  for i in cx25840; do
    install -d "$pkgdir/usr/src/linux-$compver/drivers/media/i2c/$i"
    cp -a drivers/media/i2c/$i/*.h "$pkgdir/usr/src/linux-$compver/drivers/media/i2c/$i"
  done

  # add docbook makefile
  install -D -m644 Documentation/DocBook/Makefile \
    "$pkgdir/usr/src/linux-$compver/Documentation/DocBook/Makefile"

  # add dm headers
  install -d "$pkgdir/usr/src/linux-$compver/drivers/md"
  cp drivers/md/*.h  "$pkgdir/usr/src/linux-$compver/drivers/md"

  # add inotify.h
  install -d "$pkgdir/usr/src/linux-$compver/include/linux"
  cp include/linux/inotify.h "$pkgdir/usr/src/linux-$compver/include/linux/"

  # add wireless headers
  install -d "$pkgdir/usr/src/linux-$compver/net/mac80211/"
  cp net/mac80211/*.h "$pkgdir/usr/src/linux-$compver/net/mac80211/"

  # add dvb headers for external modules
  # in reference to:
  # http://bugs.archlinux.org/task/9912
  install -d "$pkgdir/usr/src/linux-$compver/drivers/media/dvb-core"
  cp drivers/media/dvb-core/*.h "$pkgdir/usr/src/linux-$compver/drivers/media/dvb-core/"

  # add dvb headers for external modules
  # in reference to:
  # http://bugs.archlinux.org/task/11194
  install -d "$pkgdir/usr/src/linux-$compver/include/config/dvb/"
  cp include/config/dvb/*.h "$pkgdir/usr/src/linux-$compver/include/config/dvb/"

  # add dvb headers for http://mcentral.de/hg/~mrec/em28xx-new
  # in reference to:
  # http://bugs.archlinux.org/task/13146
  install -d "$pkgdir/usr/src/linux-$compver/drivers/media/dvb-frontends/"
  cp drivers/media/dvb-frontends/lgdt330x.h "$pkgdir/usr/src/linux-$compver/drivers/media/dvb-frontends/"
  cp drivers/media/i2c/msp3400-driver.h "$pkgdir/usr/src/linux-$compver/drivers/media/i2c/"

  # add dvb headers
  # in reference to:
  # http://bugs.archlinux.org/task/20402
  install -d "$pkgdir/usr/src/linux-$compver/drivers/media/usb/dvb-usb"
  cp drivers/media/usb/dvb-usb/*.h "$pkgdir/usr/src/linux-$compver/drivers/media/usb/dvb-usb/"
  install -d "$pkgdir/usr/src/linux-$compver/drivers/media/dvb-frontends"
  cp drivers/media/dvb-frontends/*.h "$pkgdir/usr/src/linux-$compver/drivers/media/dvb-frontends/"
  install -d "$pkgdir/usr/src/linux-$compver/drivers/media/tuners"
  cp drivers/media/tuners/*.h "$pkgdir/usr/src/linux-$compver/drivers/media/tuners/"

  # add xfs and shmem for aufs building
  install -d "$pkgdir/usr/src/linux-$compver/fs/xfs"
  install -d "$pkgdir/usr/src/linux-$compver/mm"
  cp fs/xfs/xfs_sb.h "$pkgdir/usr/src/linux-$compver/fs/xfs/xfs_sb.h"

  # copy in Kconfig files
  for i in $(find . -name "Kconfig*"); do
    install -d "$pkgdir/usr/src/linux-$compver"/$(echo $i | sed 's|/Kconfig.*||')
    cp "$i" "$pkgdir/usr/src/linux-$compver/$i"
  done

  # strip scripts directory
  find "$pkgdir/usr/src/linux-$compver/scripts" -type f -perm -u+w 2>/dev/null | while read binary ; do
    case "$(file -bi "$binary")" in
      *application/x-sharedlib*) # Libraries (.so)
        $_nice strip $STRIP_SHARED "$binary";;
      *application/x-archive*) # Libraries (.a)
        $_nice strip $STRIP_STATIC "$binary";;
      *application/x-executable*) # Binaries
        $_nice strip $STRIP_BINARIES "$binary";;
    esac
  done

  # remove unneeded architectures
  $_nice rm -rf "${pkgdir}"/usr/src/linux-${_kernver}/arch/{alpha,arm,arm26,avr32,blackfin,c6x,cris,frv,h8300,hexagon,ia64,m32r,m68k,m68knommu,mips,microblaze,mn10300,openrisc,parisc,powerpc,ppc,s390,score,sh,sh64,sparc,sparc64,tile,unicore32,um,v850,xtensa}
}

# vim:set ts=2 sw=2 ft=sh et: