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Copying files from the read-only /var/lib to tmpfs can be slow and waste memory. If the kernel supports the overlay file system, use it to mount a writable tmpfs on top of the read-only /var/lib and avoid the file copy. (From OE-Core rev: 370fda1b2e8d5dc011522131bba4106de26bfb19) Signed-off-by: Joshua Watt <JPEWhacker@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>