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Atomically write to a file on POSIX-compliant systems while preserving
permissions.
On most Unix systems, mv is an atomic operation. This makes it simple to
write to a file atomically just by using the mv operation. However, this
will destroy the permissions on the original file. This library does the
following to preserve permissions while atomically writing to a file:
* If an original file exists, take those permissions and apply them to the
temp file before mving the file into place.
* If the original file does not exist, create a following with default
permissions (based on the currently-active umask).
This way, when the file is mv'ed into place, the permissions will be the
ones held by the original file.
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