[Rpm-maint] [rpm-software-management/rpm] option to disable fsync (#1401)

[Colin Walters]

For rpm-ostree, we rely on ostree for transactionality - ostree does fsync (or not) per its configuration.

As best I can tell, rpm doesn't offer an API to disable its use of fsync (for the database or for writing files, though I only really care about the former).  There are references to `nofsync` which I *think* is only parsed by the db3 backend?

I know about things like [libeatmydata](https://github.com/stewartsmith/libeatmydata) but the problem of course is that librpm is linked into the same process (rpm-ostree) as the code that is doing the ostree commit.

We already use FUSE for scripts, so I could probably intercept the writes with FUSE but I'd imagine adding an API for this would be fairly straighforward, right?



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