defconfig

#!/bin/sh
#
# defconfig - Manages the $EV3DEV_DEFCONFIG file in the kernel tree.
#

. ./setup-env

kernel_src_path="$EV3DEV_KERNEL"
obj_path="$EV3DEV_OBJ"
make_args="$EV3DEV_MAKE_ARGS -C $kernel_src_path KBUILD_OUTPUT=$obj_path ARCH=arm CROSS_COMPILE=$EV3DEV_ABI"

show_usage()
  echo "Usage: ./defconfig load | merge | update [-i]"
  echo
  echo "COMMANDS"
  echo "--------"
  echo "load     Replaces the current kernel configuration with the configuration"
  echo "         specified $EV3DEV_DEFCONFIG. WARNING: You will lose any changes"
  echo "         that you made to the local kernel configuration."
  echo
  echo "merge    Calls a merge tool to merges the contents of $EV3DEV_DEFCONFIG"
  echo "         into the current kernel configuration"
  echo
  echo "update   Calls a merge tool to the current kernel configuration into"
  echo "         arch/arm/configs/$EV3DEV_DEFCONFIG with the current"
  echo
  echo "REMARKS"
  echo "-------"
  echo "$EV3DEV_DEFCONFIG is located at arch/arm/configs/$EV3DEV_DEFCONFIG in the"
  echo "kernel tree. The current configuration is located at $obj_path/.config"
  echo
  echo "The merge tool is specified by the EV3DEV_MERGE_CMD environment variable."
  echo "You can override this in ./local-env."

check_for_local_config()
  if [ ! -f $obj_path/.config ]; then
    echo "There is no local kernel configuration at $obj_path/.config"
    exit 1
  fi

if [ $# -gt 1 ]; then
  show_usage
  exit 1
fi

case "$1" in
  load)
    if [ -f $obj_path/.config ]
    then
      echo "This will overwrite your existing kernel configuration!"
      echo "Are you sure you want to do this? (y/[n])"
      read yes_no
      if [[ $yes_no != "y" ]]; then
        echo "Canceling..."
        exit 1
      fi
    fi
    rm -f $obj_path/.config
    make $make_args defconfig KBUILD_DEFCONFIG=$EV3DEV_DEFCONFIG
    exit $?
  ;;
  merge)
    check_for_local_config
    mv $obj_path/.config $obj_path/.config.old
    make $make_args defconfig KBUILD_DEFCONFIG=$EV3DEV_DEFCONFIG
    mv $obj_path/.config $obj_path/.config.new
    mv $obj_path/.config.old $obj_path/.config
    export file1=$obj_path/.config.new
    export file2=$obj_path/.config
    eval $EV3DEV_MERGE_CMD
    rm -f $obj_path/.config.new
  ;;
  update)
    check_for_local_config
    make $make_args savedefconfig || exit $?
    export file1=$obj_path/defconfig
    export file2=$kernel_src_path/arch/arm/configs/$EV3DEV_DEFCONFIG
    eval $EV3DEV_MERGE_CMD
    rm -f $file1
    exit $?
  ;;
  *)
    show_usage
    exit 1
  ;;
esac