cp: restrict permissions when copying FIFO #4211
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When copying the contents of a named pipe (also known as a FIFO) via
cp --preserve=ownership --copy-contents fifo fifo-copy
limit the permissions of the destination file while the contents are
being copied, and then restore the permissions to match those of the
source FIFO when all contents have been copied successfully.
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When copying the contents of a named pipe (also known as a FIFO) via
limit the permissions of the destination file while the contents are being copied, and then restore the permissions to match those of the source FIFO when all contents have been copied successfully.
This should cause the GNU test suite file
tests/cp/file-perm-race.shto pass.