#!/bin/bash
#
# Create a patch file between the base version and the current kernel-source
# Run on kernel-source.git repository:
# % make_diff.sh /somewhere/linux-glibc-devel-6.4.tar.xz
#

set -e

if [ -z "$1" ]; then
    echo "usage: make_diff.sh base-tarball [patchfile]"
    exit 1
fi

base="$1"
case "$base" in
  */linux-glibc-devel-*.tar.*)
    ;;
  *)
    echo "Invalid base tarball $1"
    exit 1;;
esac
if [ ! -f "$base" ]; then
  echo "Invalid base tarball $base"
  exit 1
fi
basever=${base##*/}
basever=${basever%.tar.*}

test -z "$SCRATCH_AREA" && export SCRATCH_AREA=/dev/shm/scratch
mkdir -p $SCRATCH_AREA
destdir="$SCRATCH_AREA/linux-glibc-devel"

patchfile="$2"
test -z "$patchfile" && patchfile=linux-glibc-devel-current.patch
case "$patchfile" in
  /*)
    ;;
  *)
    patchfile="$PWD/$patchfile";;
esac

susecommit=$(git rev-parse HEAD)
scripts/sequence-patch.sh --rapid --patch-dir "$destdir" || exit 1

cd "$destdir" || exit 1
kernel_dir="$PWD"
header_dir="$PWD/linux-glibc-devel-current"
mkdir -p "$header_dir"
remove="arc csky h8300 hexagon microblaze nds32 nios2 openrisc sh xtensa um"
archs=$(cd "$kernel_dir/arch" &&
	  for arch in *; do
	    test -d $arch || continue
	    case " $remove " in *" $arch "*) continue;; esac
	    echo $arch
	  done)
pushd "$kernel_dir"
for arch in $archs; do
  mkdir "$header_dir/$arch"
  cp Makefile "$header_dir/$arch"
  make O="$header_dir/$arch" headers_install ARCH=$arch
done
popd
pushd "$header_dir"
find -type f \( -name ".*.cmd" -o -name Makefile \) -exec rm -f {} +
for arch in $archs; do
  cd $arch
  #-------------------------------------------------------------------
  #Fri Sep  5 10:43:49 CEST 2008 - matz@suse.de

  #- Remove the kernel version of drm headers, they conflict
  #  with the libdrm ones, and those are slightly newer.
  #
  rm -rf usr/include/drm/
  # Remove confusing empty uapi directory
  test ! -d usr/include/uapi || rmdir usr/include/uapi
  for dir in *; do
    case "$dir" in
      usr) ;;
      *) 
	if test -d "$dir"; then
	  rm -rf "$dir"
	fi
	;;
    esac
  done
  cd ..
done
popd

tar xf "$base"
echo "kernel-source.git: $susecommit" > "$patchfile"
echo >> "$patchfile"

diff -ruN "$basever" linux-glibc-devel-current >> "$patchfile"

exit 0