[tahoe-dev] notes about DIR2:CHK deep immutability (maybe Tahoe-LAFS v1.6)

[Zooko Wilcox-O'Hearn]

I imagine that deep-immutability could be useful to folks.  For  
example, I could get a read-cap to a deep-immutable dir from someone,  
inspect it (manually or with a script) to make sure that all the  
files in it have some property, and then pass that cap on to someone  
else and know that whenever they use the cap, any files that they get  
will have that property.

Note that this assumes that either the Tahoe-LAFS gateway used by the  
recipient to whom I give the cap has the "ignore any mutable  
children" feature, or when I inspect the directory structure I have  
to make sure there aren't any mutable children in there.  It does not  
assume that the person who gave me the cap in the first place has a  
Tahoe-LAFS gateway that has the "refuse to insert mutable children"  
feature.

Regards,

Zooko