[Bug 10379] New: rsync metadata files

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=10379

           Summary: rsync metadata files
           Product: rsync
           Version: 3.1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: core
        AssignedTo: wayned at samba.org
        ReportedBy: me at haravikk.com
         QAContact: rsync-qa at samba.org


This proposal is for an optional feature within rsync that will allow it to
create special metadata files within directories, in order to keep track of
additional information. The feature would be activated by setting a
--metadata-file or similar parameter, specifying the name of the metadata file.

Whenever rsync encounters a directory (or file within it) that is eligible for
special or optimised treatment, it will add suitable information in a metadata
file within that directory, using the provided file-name. When rsync operates
on that directory in future, it will open any metadata file and use this to
obtain hints as to how to handle the directory (and files within it). If the
modified time of the metadata file differs from that of the directory it is
within then it will be validated (to detect any hints that are no longer true).

This isn't a useful feature in its own right, but would allow for possible
future features to be implemented by allowing rsync to track useful
information, particularly information that can be used to optimise comparisons.

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