#! /bin/bash
set -x

if ! [ -d kernel -a -d Documentation ]
then
    echo >&2 "Not in kernel top level directory. Exiting"
    exit 1
fi
TOPPATCHDIR=/usr/src/kernel-patches/lustre
ARCHITECTURE=`dpkg --print-installation-architecture`

QUILT="quilt --quiltrc /dev/null"
export QUILT_PATCHES="$TOPPATCHDIR/patches"

[ -f debian/APPLIED_all_lustre ] && exit 0
VERSION=$(grep ^VERSION Makefile 2>/dev/null | \
        sed -e 's/[^0-9]*\([0-9]*\)/\1/')
PATCHLEVEL=$( grep ^PATCHLEVEL Makefile 2>/dev/null | \
        sed -e 's/[^0-9]*\([0-9]*\)/\1/')
SUBLEVEL=$(grep ^SUBLEVEL Makefile 2>/dev/null | \
        sed -e 's/[^0-9]*\([0-9]*\)/\1/')
#EXTRAVERSION=$(grep ^EXTRAVERSION Makefile | head -1 2>/dev/null | \
#        sed -e 's/EXTRAVERSION =[       ]*\([^  ]*\)$/\1/')
#KERNELBRANCHLET=${VERSION}.${PATCHLEVEL}.${SUBLEVEL}
#KERNELRELEASE=${KERNELBRANCHLET}${EXTRAVERSION}
KERNELRELEASE=${VERSION}.${PATCHLEVEL}.${SUBLEVEL}

cleanup() {
  echo >&2 Cleaning up
  if [ -e series ]; then
    echo >&2 Removing series file
    rm series
  fi
  if [ -e debian/APLLIED_all_lustre_tmp/series.orig ]; then
    echo >&1 Restoring orig series file
    mv debian/APLLIED_all_lustre_tmp/series.orig series
  fi
  if [ -e .pc ]; then
    echo >&2 Removing .pc dir
    rm -r .pc
  fi
  if [ -e debian/APPLIED_all_lustre_tmp/.pc.orig ]; then
    echo >&2 Restoring orig .pc dir
    mv debian/APPLIED_all_lustre_tmp/.pc.orig .pc
  fi
}

mkdir -p debian/APPLIED_all_lustre_tmp
if [ -e series ]; then
  echo >&2 Preserving existing series file
  mv series debian/APPLIED_all_lustre_tmp/series.orig
fi
if [ -e .pc ]; then
  echo >&2 Preserving existing .pc dir
  mv .pc debian/APPLIED_all_lustre_tmp/.pc.orig
fi

trap cleanup EXIT

echo >&2 Setting up quilt
$QUILT setup $TOPPATCHDIR/series/$KERNELRELEASE-vanilla.series 2>/dev/null
ERR=$?
if ! [ $ERR = 0 ]; then
  echo >&2 Quilt failed to initialize
  cleanup
  exit $ERR
fi

echo >&2 Applying lustre patches
$QUILT push -a
ERR=$?
if ! [ $ERR = 0 ]; then
  echo >&2 Lustre patched failed to apply
  echo >&2 Reverting partialy applied patch
  $QUILT pop -a
  cleanup
  exit $ERR
fi

echo >&2 Finalizing lustre patch
mv series debian/APPLIED_all_lustre_tmp/series.lustre
mv .pc debian/APPLIED_all_lustre_tmp/.pc.lustre
cleanup


echo >&2 "\"Lustre Filesystem patch for the Linux kernel\" patch for $KVERSION succeeded"

echo >&2 "Removing empty files:"
# make an exception for ./debian, or else the stamp files will go too.
find . -path ./debian -prune -o \
       -type f -size 0 ! -name 'APPLIED*' -exec rm {} \; -print
echo >&2 "Done."

mkdir -p debian
cat > 'debian/APPLIED_all_lustre' <<EOF
SERIES=$KERNELRELEASE-vanilla.series
EOF
mkdir -p debian/image.d
PKGNAME=`dpkg -S $TOPPATCHDIR/series/$KERNELRELEASE-vanilla.series | cut -d: -f1`
PKGVERS=`grep-dctrl -n -P $PKGNAME -s Version -X /var/lib/dpkg/status`
cat > 'debian/image.d/register-lustre' <<EOF
#!/bin/sh

# This scripts documents the "Lustre Filesystem patch for the Linux kernel" kernel patch into the
# kernel-image package, as being applied to the kernel.

docdir=\${IMAGE_TOP}/usr/share/doc/kernel-image-\${version}

mkdir -p \${docdir}

(
    printf 'Lustre Filesystem patch for the Linux kernel (lustre)${KPATCH_lustre:+ for kernel ${KPATCH_lustre}},'
    echo ' from package $PKGNAME, version $PKGVERS'
) >> \${docdir}/applied-patches
EOF
chmod +x 'debian/image.d/register-lustre'

echo >&2 "END applying lustre patch"