Thanks Helix (Ivan),

I've run the checksum checker and studied the output when a file is manually 
changed in the assetstore. It seems that it flags the change but does nothing 
else.

That's what I wanted to know.

Best regards

Ian

------------

Ian Wellaway

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-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of helix84
Sent: 15 June 2012 11:52
To: Wellaway, Ian
Cc: [email protected]
Subject: Re: [Dspace-tech] Submitting to Dspace by reference

On Fri, Jun 15, 2012 at 12:39 PM, Wellaway, Ian <[email protected]> 
wrote:
> Does anyone know that if you submit to DSpace by reference, and 
> subsequently change the file (overwrite it with another for instance) 
> after the item has been entered into the archive, does this produce an error?
>
> We tried it and it seems OK but we’re worried that DSpace may notice 
> that the checksum doesn’t match the file contents at some later point 
> or after some sort of integrity check.

Hi Ian,

I believe by "submit to DSpace by reference" you mean registering bitstreams 
(<https://wiki.duraspace.org/display/DSDOC18/Registering+(not+Importing)+Bitstreams+via+Simple+Archive+Format>).
I haven't used it in production, but I played around with it.

Someone correct me if I'm wrong, but I don't think that checksums are used for 
anything else other than the checksum checker 
(<https://wiki.duraspace.org/display/DSDOC18/Validating+CheckSums+of+Bitstreams>).
This is also how you can get a list of these changed files.

In any case, if your file chages, you should deregister it (--delete) and 
register it again. You may also look at --replace, it might do the same.

Regards,
~~helix84
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