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nix-env: always print output names in JSON and XML

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The current `--out-path` flag has two disadvantages when one is only
concerned with querying the names of outputs:
- it requires evaluating every output's `outPath`, which takes
  significantly more resources and runs into more failures
- it destroys the information of the order of outputs so we can't tell
  which one is the main output

This patch makes the output names always present (replacing paths with
`null` in JSON if `--out-path` isn't given), and adds an `outputName`
field.
This commit is contained in:
Naïm Favier 2022-03-12 13:47:01 +01:00
parent d5322698a2
commit 5736661922
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GPG key ID: 49B07322580B7EE2
4 changed files with 95 additions and 86 deletions
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28
src/libexpr/get-drvs.cc
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@ -102,7 +102,7 @@ StorePath DrvInfo::queryOutPath() const
}
DrvInfo::Outputs DrvInfo::queryOutputs(bool onlyOutputsToInstall)
DrvInfo::Outputs DrvInfo::queryOutputs(bool withPaths, bool onlyOutputsToInstall)
{
if (outputs.empty()) {
/* Get the ‘outputs’ list. */
@ -112,20 +112,24 @@ DrvInfo::Outputs DrvInfo::queryOutputs(bool onlyOutputsToInstall)
/* For each output... */
for (auto elem : i->value->listItems()) {
/* Evaluate the corresponding set. */
std::string name(state->forceStringNoCtx(*elem, *i->pos));
Bindings::iterator out = attrs->find(state->symbols.create(name));
if (out == attrs->end()) continue; // FIXME: throw error?
state->forceAttrs(*out->value, *i->pos);
std::string output(state->forceStringNoCtx(*elem, *i->pos));
/* And evaluate its ‘outPath’ attribute. */
Bindings::iterator outPath = out->value->attrs->find(state->sOutPath);
if (outPath == out->value->attrs->end()) continue; // FIXME: throw error?
PathSet context;
outputs.emplace(name, state->coerceToStorePath(*outPath->pos, *outPath->value, context));
if (withPaths) {
/* Evaluate the corresponding set. */
Bindings::iterator out = attrs->find(state->symbols.create(output));
if (out == attrs->end()) continue; // FIXME: throw error?
state->forceAttrs(*out->value, *i->pos);
/* And evaluate its ‘outPath’ attribute. */
Bindings::iterator outPath = out->value->attrs->find(state->sOutPath);
if (outPath == out->value->attrs->end()) continue; // FIXME: throw error?
PathSet context;
outputs.emplace(output, state->coerceToStorePath(*outPath->pos, *outPath->value, context));
} else
outputs.emplace(output, std::nullopt);
}
} else
outputs.emplace("out", queryOutPath());
outputs.emplace("out", withPaths ? std::optional{queryOutPath()} : std::nullopt);
}
if (!onlyOutputsToInstall || !attrs)
return outputs;