I try to use --fuzzy --fuzzy with --link-dest :
rsync -aR -yy --link-dest="../2016-12-28/" --link-dest="../2016-12-27/" /my/folder srv::daemon/computer/2016-12-29/
--fuzzy --fuzzy eligible files are not detected (--debug=FUZZY2 gives nothing at all).
Files are correctly linked, but for every file, rsync daemon logs the following :
file has vanished: "/computer/2016-12-29/2016-12-28/my/folder/file"
file has vanished: "/computer/2016-12-29/2016-12-27/my/folder/file"
I tried with the following command :
rsync -aR -yy --link-dest="/computer/2016-12-28/" --link-dest="/computer/2016-12-27/" /my/folder srv::daemon/computer/2016-12-29/
Which gives :
file has vanished: "/computer/2016-12-29/srvpath/computer/2016-12-28/my/folder/file"
file has vanished: "/computer/2016-12-29/srvpath/computer/2016-12-27/my/folder/file"
I don't have these error messages with only one --fuzzy.
I don't have the problem using a SSH server as the target instead of a Rsync daemon.
And I don't have the problem setting chroot to yes in the Rsync daemon.
So sounds like these are related to --fuzzy --fuzzy talking to a Rsync daemon with chroot=no.
Tested in several environments, with Rsync 3.1.1 and 3.1.2.
I'm also surprised that, according to these log lines, --fuzzy --fuzzy tries to reach every file in link-dest directories, even if they are absolutely not needed (simple test with destination already in-sync, or with all destination files to be simply linked (same name/date/perms etc...)).
Thank you for your support !
As a workaround I found a way to enable "use chroot = yes" in my production modules.
I then put the Importance of this bug report back to "normal", but keep it opened as the issue is real :)