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Re: Metadata support

At 15:17 Uhr -0400 2006-06-27, Dan Shoop wrote:
ditto should (expectedly) mimic the Finder's copy functionality. As such an argument could be made that since the geometry of the files are different the ACL from one file shouldn't apply to the other.

what do you mean by geometry? I fail to see how ACLs should be handled any different from permissions.

- 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.

interesting. Judging from posts on the web there seem to be many subtle problems with rsync. I only listed the most obvious ones that I personally observed.

I haven't done any investigation of archive formats such as tar, so I can't tell how Apple's tools fare in that respect. 

I have.

Findings:
=========

 [...]
- creation dates maintained

unfortunately, you're wrong on this. The reason is the subtle way of Apple's creation date handling. All of cp -p, ditto, asr, AND tar set the creation date to the modification date. As I also wrote in my blog post yesterday, that behavior makes no sense whatsover by any practical definition of the semantics of creation dates. However, it also means that the bug does not become visible for files that have identical modification and creation dates. You tested just with such files.

The deficiency also becomes obbious if you study the relevant code in copyfile.c. Apple only archives ACLs, EAs, FinderInfo, and resource forks in the AppleDouble file, but fails to archive the creation date (which would be easy enough to do).

Cheers,

maurits
--
http://www.plasticsfuture.org
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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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