Merge "bazel apex: clean up gen_ndk_usedby_apex.sh to work in bazel sandbox."

# For example, current line llvm-readelf output is:

# 1: 00000000     0     FUNC      GLOBAL  DEFAULT   UND   dlopen@LIBC

# After the parse function below "dlopen" would be write to the output file.

printHelp() {

    echo "**************************** Usage Instructions ****************************"

    echo "This script is used to generate the Mainline modules used-by NDK symbols."

}

parseReadelfOutput() {

  local readelfOutput=$1; shift

  local ndkApisOutput=$1; shift

  while IFS= read -r line

  do

      if [[ $line = *FUNC*GLOBAL*UND*@* ]] ;

      then

          echo "$line" | sed -r 's/.*UND (.*@.*)/\1/g' >> "$2"

          echo "$line" | sed -r 's/.*UND (.*@.*)/\1/g' >> "${ndkApisOutput}"

      fi

  done < "$1"

  echo "" >> "$2"

  done < "${readelfOutput}"

  echo "" >> "${ndkApisOutput}"

}

unzipJarAndApk() {

  tmpUnzippedDir="$1"/tmpUnzipped

  [[ -e "$tmpUnzippedDir" ]] && rm -rf "$tmpUnzippedDir"

  mkdir -p "$tmpUnzippedDir"

  find "$1" -name "*.jar" -exec unzip -o {} -d "$tmpUnzippedDir" \;

  find "$1" -name "*.apk" -exec unzip -o {} -d "$tmpUnzippedDir" \;

  find "$tmpUnzippedDir" -name "*.MF" -exec rm {} \;

  local dir="$1"; shift

  local tmpUnzippedDir="$1"; shift

  mkdir -p "${tmpUnzippedDir}"

  find "$dir" -name "*.jar" -exec unzip -o {} -d "${tmpUnzippedDir}" \;

  find "$dir" -name "*.apk" -exec unzip -o {} -d "${tmpUnzippedDir}" \;

  find "${tmpUnzippedDir}" -name "*.MF" -exec rm {} \;

}

lookForExecFile() {

  dir="$1"

  readelf="$2"

  find "$dir" -type f -name "*.so"  -exec "$2" --dyn-symbols {} >> "$dir"/../tmpReadelf.txt \;

  find "$dir" -type f -perm /111 ! -name "*.so"  -exec "$2" --dyn-symbols {} >> "$dir"/../tmpReadelf.txt \;

  local dir="$1"; shift

  local readelf="$1"; shift

  local tmpOutput="$1"; shift

  find -L "$dir" -type f -name "*.so"  -exec "${readelf}" --dyn-symbols {} >> "${tmpOutput}" \;

  find -L "$dir" -type f -perm /111 ! -name "*.so" -exec "${readelf}" --dyn-symbols {} >> "${tmpOutput}" \;

}

if [[ "$1" == "help" ]]

then

  echo "Wrong argument length. Expecting 3 argument representing image file directory, llvm-readelf tool path, output path."

else

  unzipJarAndApk "$1"

  lookForExecFile "$1" "$2"

  tmpReadelfOutput="$1/../tmpReadelf.txt"

  [[ -e "$3" ]] && rm "$3"

  parseReadelfOutput "$tmpReadelfOutput" "$3"

  [[ -e "$tmpReadelfOutput" ]] && rm "$tmpReadelfOutput"

  rm -rf "$1/tmpUnzipped"

  imageDir="$1"; shift

  readelf="$1"; shift

  outputFile="$1"; shift

  tmpReadelfOutput=$(mktemp /tmp/temporary-file.XXXXXXXX)

  tmpUnzippedDir=$(mktemp -d /tmp/temporary-dir.XXXXXXXX)

  trap 'rm -rf -- "${tmpReadelfOutput}" "${tmpUnzippedDir}"' EXIT

  # If there are any jars or apks, unzip them to surface native files.

  unzipJarAndApk "${imageDir}" "${tmpUnzippedDir}"

  # Analyze the unzipped files.

  lookForExecFile "${tmpUnzippedDir}" "${readelf}" "${tmpReadelfOutput}"

  # Analyze the apex image staging dir itself.

  lookForExecFile "${imageDir}" "${readelf}" "${tmpReadelfOutput}"

  [[ -e "${outputFile}" ]] && rm "${outputFile}"

  parseReadelfOutput "${tmpReadelfOutput}" "${outputFile}"

fi