Re: Fibration questions

[Hans Reiser <reiser@namesys.com>]

Vitaly Fertman wrote:

>>wait -- what does this do:
>>echo -e "tea\0" > somedir/metas/plugin/hash
>>    
>>
>
>will set the hash tea in 'somedir' if it is empty.
>if it has 'subdir' already, nothing happens.
>
>  
>
>>echo -e "something_differenet\0" > somedir/subdir/metas/plugins/hash
>>    
>>
>
>will set the hash 'something_differenet' if any of [r5 | tea | fnv1 | 
>rupasov | degenerate hash | all future hash plugins] in 'somedir/subdir' 
>if 'subdir' is empty.
>  
>
is something_different constrained to

 [r5 | tea | fnv1 | rupasov | degenerate hash | some future hash plugin existing at time of command]

?

(I hope so.)

>  
>
>>echo -e "r5\0" > somedir/metas/plugins/hash
>>    
>>
>
>nothing happens as 'subdir' exists.
>
>  
>
>>What is the hash of "subdir" now?
>>    
>>
>
>'somthing_different'
>
>  
>
>>What about new subdirs?  What hash will they get?
>>    
>>
>
>new subobjects inherit all plugins from the object they are created 
>in at the creation time. future changes of plugins of the object will 
>not be applied to already created subobjects, only to new subobjects.
>
>Note: if a plugin is used for rendering the object content then its 
>changing needs a convertion method. Thus if you create a file in 
>the dir then the hash plugin gets used, and you need to convert the 
>dir to change the hash successfully. As there is no such convertion 
>methods yet, you cannot change the hash of not empty dir.
>
>  
>