fix build: sdimage (#337886)

      # Make a crude approximation of the size of the target image.

      # If the script starts failing, increase the fudge factors here.

      numInodes=$(find ./rootImage | wc -l)

      numDataBlocks=$(du -s -c -B 4096 --apparent-size ./rootImage | tail -1 | awk '{ print int($1 * 1.10) }')

      numDataBlocks=$(du -s -c -B 4096 --apparent-size ./rootImage | tail -1 | awk '{ print int($1 * 1.20) }')

      bytes=$((2 * 4096 * $numInodes + 4096 * $numDataBlocks))

      echo "Creating an EXT4 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks)"

      mebibyte=$(( 1024 * 1024 ))

      # Round up to the nearest mebibyte.

      # This ensures whole 512 bytes sector sizes in the disk image

      # and helps towards aligning partitions optimally.

      if (( bytes % mebibyte )); then

        bytes=$(( ( bytes / mebibyte + 1) * mebibyte ))

      fi

      truncate -s $bytes $img

      faketime -f "1970-01-01 00:00:01" fakeroot mkfs.ext4 -L ${volumeLabel} -U ${uuid} -d ./rootImage $img