[issue8604] Adding an atomic FS write API

[Milko Krachounov]

Milko Krachounov <python at milko.3mhz.net> added the comment:

> Something's missing in all the implementations presented:
> to make sure that the new version of the file is available afer 
> a crash, fsync must be called on the containing directory after 
> the rename.

I upgraded my proposed approach to include dir fsync, and to do a copy when backing up instead of rename (is that good?)

http://bazaar.launchpad.net/~exabyte/blackherd/async-refactor/view/66/blackherd/misc.py#L498

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