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In contrast to 'touching' a file without parameters 'touch -a' can only be performed by the file owner. In case of a shared sstate-cache served locally (e.g. over NFS), where the user running bitbake is not the owner of sstate-cache files, even if he has write access on group level, the sstate_unpack_package task will fail. Checking if the file is owned by the user before attempting to run 'touch -a' on it solves this. (From OE-Core rev: f1554e8bd40c640fd58daac18ecf7b458e754109) Signed-off-by: Norman Stetter <norman.stetter@garz-fricke.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>