[Nix-dev] file exists?

[Martin Bravenboer]

Hi Eelco,

What can I do about this?
--------------------------------------------------------------------
substituting path 
`/nix/store/71faljni7zxd6r0zjnad7bzrqlpdl6k0-zlib-1.2.2' using 
substituter `/nix/libexec/nix/download-using-

*** Trying to download/patch 
`/nix/store/71faljni7zxd6r0zjnad7bzrqlpdl6k0-zlib-1.2.2'

*** Step 1/3: using already present path 
`/nix/store/7fab41f044f49be69c9013499b2d0a42-zlib-1.2.1'

*** Step 2/3: applying patch 
`http://catamaran.labs.cs.uu.nl/dist/patches/d4a911566c17e9caa25b0c88f1448db9-zlib-1.2.1-to-1.2.1 
                       b41f044f49be69c9013499b2d0a42-zlib-1.2.1' to 
create `/nix/store/17d405c90decdd0989d15fe1db0e8802-zlib-1.2.1'
   downloading patch...
   packing base path...
   applying patch...
   unpacking patched archive...
error: creating directory 
/nix/store/17d405c90decdd0989d15fe1db0e8802-zlib-1.2.1: File exists
cannot unpack /tmp/nar2 into 
`/nix/store/17d405c90decdd0989d15fe1db0e8802-zlib-1.2.1' at 
/nix/libexec/nix/download-using-manif
substitution of path 
`/nix/store/71faljni7zxd6r0zjnad7bzrqlpdl6k0-zlib-1.2.2' using 
substituter `/nix/libexec/nix/download-usi                       r for 
`/nix/store/71faljni7zxd6r0zjnad7bzrqlpdl6k0-zlib-1.2.2' failed with 
exit code 1
--------------------------------------------------------------------

Thanks,
-- 
Martin Bravenboer
---------------------------------------------------------------------
Center for Software Technology
Institute of Information and Computing Sciences
Utrecht University