using rsync with Mac OS X
cwg-dated-55c191e81afae8e9 at deepeddy.com
Tue Dec 18 02:17:44 EST 2001
> From: Mark Valence <kurash at sassafras.com>
> Date: Sun, 16 Dec 2001 22:26:04 -0500
> 1) convert (on the fly) all files to MacBinary before
> comparing/sending them to the destination. MacBinary is a well
> documented way to package an HFS file into a single data file. The
> benefits with this method are compatibility with existing rsync
> versions that are not MacBinary aware, while the drawbacks are speed,
> maintainability, and that directory metadata is not addressed at all.
> 2) Treat the two forks and metadata as three separate files for the
> purposes of comparison/sending, and then reassemble them on the
> destination. Same drawbacks and benefits of the MacBinary route.
> This would also take more memory (potentially three times the number
> of files in the flist).
> 3) Change the protocol and implementation to handle arbitrary
> metadata and multiple forks. This could be made sort-of compatible
> with existing rsync's by using various tricks, but the most efficient
> way would be to alter the protocol. Benefits are that this would
> make the protocol extensible. Metadata can be "tagged" so that you
> could add any values needed, and ignore those tags that are not
> understood or supported. Any number of forks could be supported,
> which gives a step up in supporting NTFS where a file can have any
> number of "data streams". In fact, forks and metadata could all be
> done in the same way in the protocol.
A quick thought about implementation details: It would be nice if this were
done in such a way that if I were to rsync from a non-OSX netatalk system
onto an OSX system the .AppleDouble directories would be merged back into the
files, and conversely if I were to rsync from an OSX system to a netatalk
system the resource forks would be split into .AppleDouble directories.
I guess this would be simplest with scheme 2 above.
Chris Garrigues http://www.DeepEddy.Com/~cwg/
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