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Archiving sockets causes tar to report an error and return a nonzero exit status. Archiving a mounted filesystem is harmless, but may greatly bloat the size of the cache tarball, and wastes time on boot. To fix these issues, use `find` to only include the files we want, which are the file types that udev will create (block/char devices and symlinks) that are on the same filesystem as /dev. While we're at it, remove a subshell by archiving /dev as an absolute path. However, `tar` will complain about stripping the leading slash on stderr. To inhibit this, `cut` out the leading slash. An alternative solution is to use `tar --exclude`, but that is modestly more brittle, since we'd need to explicitly list every socket and filesystem to exclude. Note that `tar --one-file-system` is GNU-specific, and tar implementations generally have nothing equivalent to `find -type`. If using busybox `find`, this change requires CONFIG_FEATURE_FIND_TYPE=y and CONFIG_FEATURE_FIND_XDEV=y. If using busybox `tar`, this change requires CONFIG_FEATURE_TAR_FROM=y. (From OE-Core rev: e89df123e2ec516ae61763eab3c9e78e067e28d5) Signed-off-by: Richard Tollerton <rich.tollerton@ni.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>