rsync: New version 3.4.4

[eschnett]

No description provided.

[fingolfin]

Apparently this version has a lot of regressions... looking at https://github.com/RsyncProject/rsync/issues

There was also RsyncProject/rsync#929 which made the rounds on HackerNews and elsewhere; I am not exactly happy with the tone and approach, but it does seem this has an unusual amount of breaking changes, so it might be best to wait for 3.4.4 or so.

[eschnett]

As the new patches show, this version of rsync uses some advanced system calls that avoid certain kinds of race conditions. Unfortunately, our build systems (both for Linux and Macos) are too old to support these, and I had to add patches to make this work. For Linux the syscall number is known, so that was easy, but for Macos I am basically disabling this new feature. I wish rsync had well-tested compile-time fallbacks instead of one person designing patches.

[fingolfin]

Since I posted some links to discussions about the rsync upgrade, I think it is only fair to also post the author's (very reasonable!) reply: https://medium.com/@tridge60/rsync-and-outrage-d9849599e5a0