[Freeipa-devel] Adding GUID to the user

[Simo Sorce]

On Fri, 2007-09-28 at 10:02 -0600, Richard Megginson wrote:
> Simo Sorce wrote:
> > On Fri, 2007-09-28 at 09:10 -0600, Richard Megginson wrote:
> >   
> >> Simo Sorce wrote:
> >>     
> >>> On Fri, 2007-09-28 at 08:33 -0600, Richard Megginson wrote:
> >>>   
> >>>       
> >>>> Fedora DS generates the operational attribute nsUniqueID for each 
> >>>> entry.  It is a GUID/UUID but it is formatted a little bit differently
> >>>> e.g.
> >>>> xxxxxxxx-xxxxxxxx-xxxxxxxx-xxxxxxxx
> >>>> instead of the usual
> >>>> xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx 
> >>>>     
> >>>>         
> >>> For interoperability reasons we really need a real GUID, is it possible
> >>> to have that ?
> >>>   
> >>>       
> >> By real do you mean formatted as 8-4-4-4-12 instead of 8-8-8-8?  It is 
> >> possible, but it would require a lot of code changes.  Another 
> >> possibility is that we could deprecate nsUniqueID and instead use the 
> >> LDAP entryUUID attribute.
> >>     
> >
> > Is the format the only difference?
> >   
> Yes.
> > Aren't there rules on how to build the GUID in term of what data to use
> > etc ?
> >   
>  From the DS code:
> /* uuid.h - interface  to uuid layer. UUID is generated in accordance
>             with UUIDs and GUIDs IETF draft
>  */
> typedef struct _guid_t
> {
>     unsigned32 time_low;
>     unsigned16 time_mid;
>     unsigned16 time_hi_and_version;
>     unsigned8  clock_seq_hi_and_reserved;
>     unsigned8  clock_seq_low;
>     PRUint8    node[6];
> } guid_t;
> 
> I'm not sure why they chose (in 1999/2000) to format the string 
> representation as 8-8-8-8 instead of the 8-4-4-4-12 that the rest of the 
> world uses, but it is only the string representation that is different.

Then I guess that in the interim we may just copy and reformat the
string into a new attribute at object creation?
I guess it can even be just a post operation and the attribute may be
taken off replication as we can guarantee it is completely equivalent to
the UUID. Does it make sense?

Simo.