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Simplify nix develop "gathering derivation environment"

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Before, had some funny logic with an unnecessary is CA enabled branch,
and erroneous use of the comma operator. Now, take advantage of the new
`Derivation::fillInOutputPaths` to fill in input addresses (and output
path env vars) in a much-more lightweight manner.

Also, fix `nix develop` on fixed-output derivations so that weird things
don't happen when we have that experimental feature enabled.

As a slight behavior change, if the original derivation was
content-addressing this one will be too, but I really don't think that
matters --- if anything, it is a slight improvement for users that have
already opted into content-addressing anyways.
This commit is contained in:
John Ericson 2025-11-24 23:27:00 -05:00
parent e91b7d1732
commit 801cb16131
2 changed files with 20 additions and 24 deletions
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36
src/nix/develop.cc
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@ -272,26 +272,24 @@ static StorePath getDerivationEnvironment(ref<Store> store, ref<Store> evalStore
drv.name += "-env";
drv.env.emplace("name", drv.name);
drv.inputSrcs.insert(std::move(getEnvShPath));
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
for (auto & output : drv.outputs) {
output.second = DerivationOutput::Deferred{}, drv.env[output.first] = hashPlaceholder(output.first);
}
} else {
for (auto & output : drv.outputs) {
output.second = DerivationOutput::Deferred{};
drv.env[output.first] = "";
}
auto hashesModulo = hashDerivationModulo(*evalStore, drv, true);
for (auto & output : drv.outputs) {
Hash h = hashesModulo.hashes.at(output.first);
auto outPath = store->makeOutputPath(output.first, h, drv.name);
output.second = DerivationOutput::InputAddressed{
.path = outPath,
};
drv.env[output.first] = store->printStorePath(outPath);
}
for (auto & [outputName, output] : drv.outputs) {
std::visit(
overloaded{
[&](const DerivationOutput::InputAddressed &) {
output = DerivationOutput::Deferred{};
drv.env[outputName] = "";
},
[&](const DerivationOutput::CAFixed &) {
output = DerivationOutput::Deferred{};
drv.env[outputName] = "";
},
[&](const auto &) {
// Do nothing for other types (CAFloating, Deferred, Impure)
},
},
output.raw);
}
drv.fillInOutputPaths(*evalStore);
auto shellDrvPath = writeDerivation(*evalStore, drv);