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For the purpose of image construction using du on a rootfs directory isn't entirely satisfactory. Bare "du" will report the actual disk usage so file systems which can compress the data will report less than the actual space required. Using "du --apparent-size" will report the actual space used, but as this simply sums the bytes used for content across an entire file system can result in significant under-reporting due to block size overhead. Attempt to solve these problems by implementing our own function to calculate how large a rootfs will be. This function handles hardlinks correctly but rounds up all sizes to multiples of the block size (currently, 4KB is the hard-coded block size). (From OE-Core rev: 6ca53ad7b26ee2b4e6d2c121c6f6d6eed7f6b56f) Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>