rsync - Mar 2016 - [Bug 11800] New: smarter "safe" symlink detection

https://bugzilla.samba.org/show_bug.cgi?id=11800

            Bug ID: 11800
           Summary: smarter "safe" symlink detection
           Product: rsync
           Version: 3.1.1
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: core
          Assignee: wayned at samba.org
          Reporter: world.locus at gmail.com
        QA Contact: rsync-qa at samba.org

Hi,

We are using --copy-unsafe-links to sync a complex file/directory tree that
spans over multiple nfs drives to another site. However, --copy-unsafe-links
considers the following subdir1_link symlink as "unsafe":

/nfs/dir1/subdir1/
|-- file1
|-- subdir1_link -> /nfs/dir1/subdir1
`-- subdir2
    `-- file2


subdir1_link is detected as unsafe and therefore its content is synced over and
over and therefore we get the following:

/nfs/dir1/subdir1/subdir1_link/subdir1_link/subdir1_link/...


Is it possible to detect that subdir1_link is actually a "safe"
symlink and
sync it as:

subdir1_link -> .

Regards,
Mak

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https://bugzilla.samba.org/show_bug.cgi?id=11800

--- Comment #1 from world.locus at gmail.com ---
a simpler enhancement would be to add an exclude switch for excluding
files/dirs from unsafe link detection so that we can exclude circular symlinks
manually.

e.g. --exclude-unsafe-link '*parent*'

these excluded symlinks would be synced as symlinks

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