Binary cache - improve error message when trying to copy partial closure #2958
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Since 0207272#diff-4fb7d3254df1c8894c7014adc990dfa1 copying a partial closure isn't allowed, but the error message is a bit misleading: "the reference is not valid" might mean that there's something wrong on the local store (missing path, invalid signature, ...).
Just out of curiosity, why isn't it possible to partially copy a closure to a binary cache? Shouldn't nix be able to pull a closure from different substituters? Isn't this a bit at odd with the
nix copy --no-recursive
option?