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This was added to allow detection of duplicate files being installed by sstate. There is a much simpler way, just check if the file already exists. This effectively uses the kernel VFS as the cache which is much more efficient. This resolves a significant performance bottleneck (lock contention on a single file) when running builds that are just being generated from sstate cache files. (From OE-Core rev: 603daf343ad3f18c8adb799e3625ae2a18d94f56) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>