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Re: Metadata support


On Jun 27, 2006, at 12:17 PM, Dan Shoop wrote:

- rsync -aE doesn't preserve BSD flags, locked flag, modification date of files with resource forks, ACLs (I'm sure there's gazillions of rdars)

It also doesn't appear to be able to copy files with both ACLs and resource forks. It appears to only work if you have one or the other. At least that was the last time I checked.

That's not true. rsync copies all EAs, of which ACLs are simply examples of. It also copies a couple of "synthetic EAs", namely the old-style resource fork information and the finderInfo. As far as rsync (and tar and anyone else using copyfile()) is concerned, however, it's just a list of EAs scattered across several different namespaces (for various reasons, ACL-containing EAs are logically segregated). If you want to do more digging for yourself, simply check out the source code for copyfile() and the behavior of the getxattr() call.

The creation date information you and maurits have been referring to (as copied by the Finder) is another bit of information in the HFS catalog which isn't currently exposed via stat(), but we have other ways to get at it and will probably end up storing it as another "synthetic EA" for portability purposes, though that's not a firm decision yet.

Thanks to everyone for sparking an interesting discussion. It's led us to renew internal discussion on this topic and we're currently engaged in trying to work out ways of making Finder copies and tar/cp/ rsync copies more genuinely equivalent as a result.

- Jordan

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References: 
 >Metadata support (From: Tomas Zahradnicky <email@hidden>)
 >Re: Metadata support (From: Q <email@hidden>)
 >Re: Metadata support (From: Dan Shoop <email@hidden>)
 >Re: Metadata support (From: Boyd Waters <email@hidden>)
 >Re: Metadata support (From: "Jordan K. Hubbard" <email@hidden>)
 >Re: Metadata support (From: Dan Shoop <email@hidden>)
 >Re: Metadata support (From: "Jordan K. Hubbard" <email@hidden>)
 >Re: Metadata support (From: Dan Shoop <email@hidden>)
 >Re: Metadata support (From: maurits <email@hidden>)
 >Re: Metadata support (From: Dan Shoop <email@hidden>)



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