core: Add script to check for possible shared library duplication
Running dupcheck.sh after a build on an image performs two checks:
* Check for duplicate shared libraries by MD5.
* Check for possible duplicate shared libraries by comparing .note
and .text ELF sections.
This helps looking for unnecessary file duplication in the final images.
Test: after running the script, reports will be generated in the 'out'
directory.
Change-Id: I91c044a52002557fdc8dc65bfc9fd5f313ca00f3
This commit is contained in:
Carlos Eduardo Seo
parent
3cda7834aa
commit
6e6a95b606
1 changed files with 118 additions and 0 deletions
118
core/dupcheck.sh
Executable file
118
core/dupcheck.sh
Executable file
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#!/bin/bash
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# Find duplicate shared libraries by md5 checksum and possible duplicates by size.
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# Results will be available in the out directory of the build.
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# Usage:
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# ./dupcheck.sh <out_dir> <image>
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OUT_DIR="$1"
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IMG="$2"
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TMP_MD5="${OUT_DIR}/_dup_md5"
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TMP_SIZE="${OUT_DIR}/_dup_size"
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TMP_CHECK="${OUT_DIR}/_dup_tmp_check"
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TMP_SIZE_REAL="${OUT_DIR}/_dup_size_real"
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TMP_FILE1="${OUT_DIR}/_dup_f1"
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TMP_FILE2="${OUT_DIR}/_dup_f2"
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MD5_DUPLICATES="${OUT_DIR}/duplicate-libs-md5-${IMG}.txt"
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SIZE_DUPLICATES="${OUT_DIR}/duplicate-libs-size-${IMG}.txt"
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# Check arguments
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if [ "$#" -ne 2 ]; then
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echo "Usage: ./dupcheck.sh <out_dir> <image>"
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exit 1
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fi
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# Check host and toolchain version
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CHECK_HOST=$(uname)
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if [ "${CHECK_HOST}" == "Linux" ]; then
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ARCH="linux-x86"
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else
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ARCH="darwin-x86"
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fi
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BINUTILS_PATH="./prebuilts/clang/host/${ARCH}/llvm-binutils-stable"
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# Remove any old files if they exist.
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if [ -f "${MD5_DUPLICATES}" ]; then
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rm "${MD5_DUPLICATES}"
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fi
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if [ -f "${SIZE_DUPLICATES}" ]; then
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rm "${SIZE_DUPLICATES}"
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fi
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# Find all .so files and calculate their md5.
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find ./"${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
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if [ -s "${TMP_MD5}" ]; then
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while read -r list; do
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checksum=$(echo "${list}" | cut -f1 -d ' ')
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filename=$(echo "${list}" | cut -f2 -d ' ')
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# For each md5, list the file paths that match.
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{
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echo "MD5: ${checksum}"; \
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find ./"${OUT_DIR}"/${IMG}/ -name "${filename}" -type f -print0 | xargs -0 md5sum | grep "${checksum}" | sed 's/^.* //'; \
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echo ""; \
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} >> "${MD5_DUPLICATES}"
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done <"${TMP_MD5}"
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else
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echo "No duplicate files by md5 found." >> "${MD5_DUPLICATES}"
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fi
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# Cleanup
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rm "${TMP_MD5}"
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# Find possible duplicate .so files by size.
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find ./"${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
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if [ -s "${TMP_SIZE}" ]; then
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while read -r list; do
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size=$(echo "${list}" | cut -f2 -d ' ')
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filename=$(echo "${list}" | cut -f3 -d ' ')
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# Check if the files are not in the md5sum list and do nothing if that is the case.
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find ./"${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
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while read -r filepath; do
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found=$(grep -F "${filepath}" "${MD5_DUPLICATES}")
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if [ -z "${found}" ]; then
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echo "${filepath}" >> "${TMP_SIZE_REAL}"
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fi
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done<"${TMP_CHECK}"
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# For every duplication found, diff the .note and .text sections.
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if [ -s "${TMP_SIZE_REAL}" ]; then
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{
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echo "File: ${filename}, Size: ${size}"; \
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cat "${TMP_SIZE_REAL}"; \
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echo ""; \
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} >> "${SIZE_DUPLICATES}"
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count=$(wc -l "${TMP_SIZE_REAL}" | cut -f1 -d ' ')
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# Limitation: this only works for file pairs. If more than two possible duplications are found, the user need to check manually
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# all the possible combinations using the llvm-readelf and llvm-objdump commands below.
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if [ "${count}" = 2 ]; then
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file1=$(head -n 1 "${TMP_SIZE_REAL}")
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file2=$(tail -n 1 "${TMP_SIZE_REAL}")
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# Check .note section
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${BINUTILS_PATH}/llvm-readelf --wide --notes "${file1}" > "${TMP_FILE1}" 2>&1
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${BINUTILS_PATH}/llvm-readelf --wide --notes "${file2}" > "${TMP_FILE2}" 2>&1
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{
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diff -u "${TMP_FILE1}" "${TMP_FILE2}" | sed "1d;2d;3d"; \
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echo "";
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} >> "${SIZE_DUPLICATES}"
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# Check .text section
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${BINUTILS_PATH}/llvm-objdump --line-numbers --disassemble --demangle --reloc --no-show-raw-insn --section=.text "${file1}" | sed "1d;2d"> "${TMP_FILE1}" 2>&1
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${BINUTILS_PATH}/llvm-objdump --line-numbers --disassemble --demangle --reloc --no-show-raw-insn --section=.text "${file2}" | sed "1d;2d"> "${TMP_FILE2}" 2>&1
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{
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diff -u "${TMP_FILE1}" "${TMP_FILE2}" | sed "1d;2d;3d"; \
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echo "";
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} >> "${SIZE_DUPLICATES}"
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# Cleanup
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rm "${TMP_FILE1}" "${TMP_FILE2}"
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else
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echo "*Note: more than one duplicate. Manually verify all possible combinations." >> "${SIZE_DUPLICATES}"
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fi
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rm "${TMP_SIZE_REAL}"
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echo "" >> "${SIZE_DUPLICATES}"
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fi
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done <"${TMP_SIZE}"
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# Cleanup
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rm "${TMP_SIZE}" "${TMP_CHECK}"
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else
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echo "No duplicate files by size found." >> "${SIZE_DUPLICATES}"
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fi
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