hashed-mirrors: Use parsed derivation output rather than reconstructing it #3729
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…ng it Now the derivation outputs are parsed up front, we can avoid a reparse by doing it. Also, this just feels a bit better as the `output*` env vars are more of a `libnixexpr` interface than `libnixstore` interface: ultimately, it's the derivation outputs that decide whether the derivation is fixed-output. Yes, hashed mirrors might go away with NixOS#3689, but this bit of code would be moved rather than deleted, so it's worth doing a cleanup anyways I think.
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Now the derivation outputs are parsed up front, we can avoid a reparse
by doing it. Also, this just feels a bit better as the
output*envvars are more of a
libnixexprinterface thanlibnixstoreinterface:ultimately, it's the derivation outputs that decide whether the
derivation is fixed-output.
Yes, hashed mirrors might go away with #3689, but this bit of code would
be moved rather than deleted, so it's worth doing a cleanup anyways I
think.