core: Add script to check for possible shared library duplication

#!/bin/bash

# Find duplicate shared libraries by md5 checksum and possible duplicates by size.

# Results will be available in the out directory of the build.

# Usage:

# ./dupcheck.sh <out_dir> <image>

OUT_DIR="$1"

IMG="$2"

TMP_MD5="${OUT_DIR}/_dup_md5"

TMP_SIZE="${OUT_DIR}/_dup_size"

TMP_CHECK="${OUT_DIR}/_dup_tmp_check"

TMP_SIZE_REAL="${OUT_DIR}/_dup_size_real"

TMP_FILE1="${OUT_DIR}/_dup_f1"

TMP_FILE2="${OUT_DIR}/_dup_f2"

MD5_DUPLICATES="${OUT_DIR}/duplicate-libs-md5-${IMG}.txt"

SIZE_DUPLICATES="${OUT_DIR}/duplicate-libs-size-${IMG}.txt"

# Check arguments

if [ "$#" -ne 2 ]; then

	echo "Usage: ./dupcheck.sh <out_dir> <image>"

	exit 1

fi

# Check host and toolchain version

CHECK_HOST=$(uname)

if [ "${CHECK_HOST}" == "Linux" ]; then

	ARCH="linux-x86"

else

	ARCH="darwin-x86"

fi

BINUTILS_PATH="./prebuilts/clang/host/${ARCH}/llvm-binutils-stable"

# Remove any old files if they exist.

if [ -f "${MD5_DUPLICATES}" ]; then

	rm "${MD5_DUPLICATES}"

fi

if [ -f "${SIZE_DUPLICATES}" ]; then

	rm "${SIZE_DUPLICATES}"

fi

# Find all .so files and calculate their md5.

find ./"${OUT_DIR}"/${IMG}/ -name "lib*.so" -type f -print0 | xargs -0 md5sum | sed -e "s# .*/# #" | sort | uniq -c | sort -g | sed "/^.*1 /d" | sed "s/^. *[0-9] //" > "${TMP_MD5}" 2>&1

if [ -s "${TMP_MD5}" ]; then

	while read -r list; do

		checksum=$(echo "${list}" | cut -f1 -d ' ')

		filename=$(echo "${list}" | cut -f2 -d ' ')

		# For each md5, list the file paths that match.

		{

			echo "MD5: ${checksum}";											                \

			find ./"${OUT_DIR}"/${IMG}/ -name "${filename}" -type f -print0 | xargs -0 md5sum | grep "${checksum}" | sed 's/^.* //';	\

			echo "";													                \

		} >> "${MD5_DUPLICATES}"

	done <"${TMP_MD5}"

else

	echo "No duplicate files by md5 found." >> "${MD5_DUPLICATES}"

fi

# Cleanup

rm "${TMP_MD5}"

# Find possible duplicate .so files by size.

find ./"${OUT_DIR}"/${IMG}/ -name "*.so" -type f -print0 | xargs -0 stat --format="%s %n" 2>/dev/null | sed -e "s# .*/# #" | sort | uniq -c | sort -g | sed "/^.*1 /d" > "${TMP_SIZE}" 2>&1

if [ -s "${TMP_SIZE}" ]; then

	while read -r list; do

		size=$(echo "${list}" | cut -f2 -d ' ')

		filename=$(echo "${list}" | cut -f3 -d ' ')

		# Check if the files are not in the md5sum list and do nothing if that is the case.

		find ./"${OUT_DIR}"/${IMG}/ -name "${filename}" -type f -print0 | xargs -0 stat --format="%s %n" 2>/dev/null | grep "${size}" | sed "s/^.* //" | sort > "${TMP_CHECK}" 2>&1

		while read -r filepath; do

			found=$(grep -F "${filepath}" "${MD5_DUPLICATES}")

			if [ -z "${found}" ]; then

				echo "${filepath}" >> "${TMP_SIZE_REAL}"

			fi

		done<"${TMP_CHECK}"

		# For every duplication found, diff the .note and .text sections.

		if [ -s "${TMP_SIZE_REAL}" ]; then

			{

				echo "File: ${filename}, Size: ${size}";	\

				cat "${TMP_SIZE_REAL}";				\

				echo "";					\

			} >> "${SIZE_DUPLICATES}"

			count=$(wc -l "${TMP_SIZE_REAL}" | cut -f1 -d ' ')

			# Limitation: this only works for file pairs. If more than two possible duplications are found, the user need to check manually

			# all the possible combinations using the llvm-readelf and llvm-objdump commands below.

			if [ "${count}" = 2 ]; then

				file1=$(head -n 1 "${TMP_SIZE_REAL}")

				file2=$(tail -n 1 "${TMP_SIZE_REAL}")

				# Check .note section

				${BINUTILS_PATH}/llvm-readelf --wide --notes "${file1}" > "${TMP_FILE1}" 2>&1

				${BINUTILS_PATH}/llvm-readelf --wide --notes "${file2}" > "${TMP_FILE2}" 2>&1

				{

					diff -u "${TMP_FILE1}" "${TMP_FILE2}" | sed "1d;2d;3d";	\

					echo "";

				} >> "${SIZE_DUPLICATES}"

				# Check .text section

				${BINUTILS_PATH}/llvm-objdump --line-numbers --disassemble --demangle --reloc --no-show-raw-insn --section=.text "${file1}" | sed "1d;2d"> "${TMP_FILE1}" 2>&1

				${BINUTILS_PATH}/llvm-objdump --line-numbers --disassemble --demangle --reloc --no-show-raw-insn --section=.text "${file2}" | sed "1d;2d"> "${TMP_FILE2}" 2>&1

				{

					diff -u "${TMP_FILE1}" "${TMP_FILE2}" | sed "1d;2d;3d";	\

					echo "";

				} >> "${SIZE_DUPLICATES}"

				# Cleanup

				rm "${TMP_FILE1}" "${TMP_FILE2}"

			else

				echo "*Note: more than one duplicate. Manually verify all possible combinations." >> "${SIZE_DUPLICATES}"

			fi

			rm "${TMP_SIZE_REAL}"

			echo "" >> "${SIZE_DUPLICATES}"

		fi

	done <"${TMP_SIZE}"

	# Cleanup

	rm "${TMP_SIZE}" "${TMP_CHECK}"

else

	echo "No duplicate files by size found." >> "${SIZE_DUPLICATES}"

fi