rsync - Jun 2017 - [Bug 12835] New: Allow --link-dest to link to an optionally unexisting directory

https://bugzilla.samba.org/show_bug.cgi?id=12835

            Bug ID: 12835
           Summary: Allow --link-dest to link to an optionally unexisting
                    directory
           Product: rsync
           Version: 3.1.3
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: core
          Assignee: wayned at samba.org
          Reporter: julien+bugzilla-samba at palard.fr
        QA Contact: rsync-qa at samba.org

Found myself trying to hardlink between versions, but as I may rsync to a new
server I may not having an old version to point to, so I had to use:

  rsync -rl --link-dest=$(ssh prod "cd /var/www; readlink -e current ||
echo
.") static index.html prod:/var/www/$CI_COMMIT_SHA/
  ssh prod "ln -nfs $CI_COMMIT_SHA" current 

Which is ugly.

I'd prefer something like:

  rsync -rl --link-dest=current static index.html prod:/var/www/$CI_COMMIT_SHA/
  ssh prod "ln -nfs $CI_COMMIT_SHA" current

But warning / erroring on missing --link-dest sound legitimate, and we may not
want to change this. If not, why not introduce a --link-dest-if-exists? Or a
--ignore-missing-link-dest (in combination with the normal --link-dest)?

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