#!/usr/bin/env bash

BINARY_PATH=$1
BINARY_NAME=$(basename $BINARY_PATH)
DESTINATION_STRIPPED_DIR=$2
OBJCOPY_PATH=${3:objcopy}
READELF_PATH=${4:readelf}

BUILD_ID=$($READELF_PATH -n $1 | sed -n '/Build ID/ { s/.*: //p; q; }')
BUILD_ID_PREFIX=${BUILD_ID:0:2}
BUILD_ID_SUFFIX=${BUILD_ID:2}
TEMP_BINARY_PATH="${BINARY_PATH}_temp"

DESTINATION_DEBUG_INFO_DIR="$DESTINATION_STRIPPED_DIR/lib/debug/.build-id"
DESTINATION_STRIP_BINARY_DIR="$DESTINATION_STRIPPED_DIR/bin"

mkdir -p "$DESTINATION_DEBUG_INFO_DIR/$BUILD_ID_PREFIX"
mkdir -p "$DESTINATION_STRIP_BINARY_DIR"

$OBJCOPY_PATH --only-keep-debug "$BINARY_PATH" "$DESTINATION_DEBUG_INFO_DIR/$BUILD_ID_PREFIX/$BUILD_ID_SUFFIX.debug"

touch "$TEMP_BINARY_PATH"
$OBJCOPY_PATH --add-gnu-debuglink "$DESTINATION_DEBUG_INFO_DIR/$BUILD_ID_PREFIX/$BUILD_ID_SUFFIX.debug" "$BINARY_PATH" "$TEMP_BINARY_PATH"
$OBJCOPY_PATH --strip-all "$TEMP_BINARY_PATH" "$DESTINATION_STRIP_BINARY_DIR/$BINARY_NAME"
rm -f "$TEMP_BINARY_PATH"