#!/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}

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"


cp "$BINARY_PATH" "$DESTINATION_STRIP_BINARY_DIR/$BINARY_NAME"

$OBJCOPY_PATH --only-keep-debug --compress-debug-sections "$DESTINATION_STRIP_BINARY_DIR/$BINARY_NAME" "$DESTINATION_DEBUG_INFO_DIR/$BUILD_ID_PREFIX/$BUILD_ID_SUFFIX.debug"
chmod 0644 "$DESTINATION_DEBUG_INFO_DIR/$BUILD_ID_PREFIX/$BUILD_ID_SUFFIX.debug"
chown 0:0 "$DESTINATION_DEBUG_INFO_DIR/$BUILD_ID_PREFIX/$BUILD_ID_SUFFIX.debug"

strip --remove-section=.comment --remove-section=.note "$DESTINATION_STRIP_BINARY_DIR/$BINARY_NAME"

$OBJCOPY_PATH --add-gnu-debuglink "$DESTINATION_DEBUG_INFO_DIR/$BUILD_ID_PREFIX/$BUILD_ID_SUFFIX.debug" "$DESTINATION_STRIP_BINARY_DIR/$BINARY_NAME"