[hdf-forum] provenance

[Quincey Koziol]

Hi Dimitris,

On Mar 24, 2009, at 5:14 PM, Dimitris Servis wrote:

> Hi Quincey
>
> sorry it was not clear. I meant the UUID. If I copy the HDF5  
> "internal" UUID from one file to another along with the accessible  
> contents, I do not need to manipulate the time stamp of the target  
> file to be the same with that of the source file, so that  
> applications that depend on the stamp will not tell the difference.  
> I ask all applications to check the UUID.

	Hmm, I don't think copying the UUID to the new file is a good idea -  
the UUID for each file created by the HDF5 library should be unique.   
The new file should get its own UUID...

		Quincey

> thanks!
>
> -- dimitris
>
> 2009/3/24 Quincey Koziol <koziol at hdfgroup.org>
> Hi Dimitris,
>
>
> On Mar 24, 2009, at 3:41 PM, Dimitris Servis wrote:
>
> Hi Quincey
>
> if it would be possible to copy it, I would also be interested. My  
> use case is this: when deleting large objects from the file, I copy  
> all objects to a new file and delete the old one. But some  
> applications may depend on the time stamp of the file and therefore  
> I would have to modify the time stamp of the new file using OS  
> functions. Any unique ID would solve this.
>
>        Are you wanting to copy objects' access/modification/etc  
> times, or the UUID for the file?
>
>                Quincey
>
>
> thanks!
>
> -- dimitros
>
> 2009/3/24 Quincey Koziol <koziol at hdfgroup.org>
> Hi Matthew,
>
> On Mar 24, 2009, at 1:32 PM, Matthew Dougherty wrote:
>
> Is there a unique identifier internally within an HDF file when it  
> is created?
>
> Something that would distinguish it from another HDF file created  
> two seconds later, and cannot be disabled or modified.
> Do not want to use the operating system/file system creation date or  
> parameters in fstat, prefer a HDF api.
>
>       That's a good idea...  Would a UUID fit what you are  
> thinking?  (http://en.wikipedia.org/wiki/Uuid)
>
>               Quincey
>
> On Mar 24, 2009, at 5:11 AM, Quincey Koziol wrote:
>
>       BTW, tracking these time for an object can be disabled by  
> calling H5Pset_obj_track_times() with the 'track_times' parameter  
> set to FALSE.
>
>
>
>
>
>

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