Dedup some derivation initialization logic, and test #14560
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| * | ||
| * @param store The store to use for validation | ||
| */ | ||
| void checkInvariants(Store & store) const; |
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Why is this version needed now?
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It is used in parseJsonAndValidate, we validate the derivation before we compute its drvPath now. The drvPath was just used for error messages, but it we can write a better error message --- since we just computed the drv path, it won't mean anything to the human reading the error anyways where ("derivation from JSON" or similar will)
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| # If we remove the input addressed to make it a deferred derivation, we | ||
| # still get the same result because Nix will see that need not be | ||
| # deferred and fill in the right input address for us. |
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Why is this a good thing? From reading checkInvariants, it looks like this is new behavior.
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checkInvariants doesn't do this, but fillInOutputPaths does. It is new behavior in the JSON code path, but not new behavior in the builtins.derivation code path.
src/libstore/derivations.cc
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| return; | ||
| } | ||
| auto & value = j->second; | ||
| if (value == "") { |
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Can this actually happen - I did not see it in the old code?
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The user-submitted JSON is arbitrary data, so yes it can happen. It also does happen in the builtins.derivationStrict code path already.
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These do a read/write test in the middles of some computation. They are an imperative way to test intermediate values rather than functionally testing end outputs.
`nix derivation add`, and its C API counterpart, now works a bit closer to `builtins.derivation` in that they don't require the user to fill-in input addressed paths correctly ahead of time. The logic for this is carefully deduplicated, between all 3 entry points, and also between the existing `checkInvariants` function. There are some more functional tests, and there are also many more unit tests. Co-authored-by: Sergei Zimmerman <[email protected]> Co-authored-by: edef <[email protected]>
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Motivation
nix derivation add, and its C API counterpart, now works a bit closer tobuiltins.derivationin that they don't require the user to fill-in input addressed paths correctly ahead of time.The logic for this is carefully deduplicated, between all 3 entry points, and also between the existing
checkInvariantsfunction. There are some more functional tests, and there are also many more unit tests.Context
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