[Nix-dev] read-only nix store

[roconnor at theorem.ca]

I'm surprised that derivations in the nix store are not read only.  I 
would have expected the last step of building a derivation would be to 
make the final result read only.

When making nix packages I keep encountering problems where the program 
writes into the store at runtime.  If derivations were made read only, 
finding these problems might be easier, and there would be less chance of 
derivations being "corrupted".

-- 
Russell O'Connor                                      <http://r6.ca/>
``All talk about `theft,''' the general counsel of the American Graphophone
Company wrote, ``is the merest claptrap, for there exists no property in
ideas musical, literary or artistic, except as defined by statute.''