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#include "installables.hh"
#include "installable-derived-path.hh"
#include "installable-value.hh"
#include "store-api.hh"
#include "eval-inline.hh"
#include "eval-cache.hh"
#include "names.hh"
#include "command.hh"
#include "derivations.hh"
#include "downstream-placeholder.hh"
namespace nix {
/**
* Return the rewrites that are needed to resolve a string whose context is
* included in `dependencies`.
*/
StringPairs resolveRewrites(
Store & store,
const std::vector<BuiltPathWithResult> & dependencies)
{
StringPairs res;
if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
for (auto & dep : dependencies) {
if (auto drvDep = std::get_if<BuiltPathBuilt>(&dep.path)) {
for (auto & [ outputName, outputPath ] : drvDep->outputs) {
res.emplace(
DownstreamPlaceholder::fromSingleDerivedPathBuilt(
SingleDerivedPath::Built {
.drvPath = make_ref<SingleDerivedPath>(drvDep->drvPath->discardOutputPath()),
.output = outputName,
}).render(),
store.printStorePath(outputPath)
);
}
}
}
}
return res;
}
/**
* Resolve the given string assuming the given context.
*/
std::string resolveString(
Store & store,
const std::string & toResolve,
const std::vector<BuiltPathWithResult> & dependencies)
{
auto rewrites = resolveRewrites(store, dependencies);
return rewriteStrings(toResolve, rewrites);
}
UnresolvedApp InstallableValue::toApp(EvalState & state)
{
auto cursor = getCursor(state);
auto attrPath = cursor->getAttrPath();
auto type = cursor->getAttr("type")->getString();
std::string expected = !attrPath.empty() &&
(state.symbols[attrPath[0]] == "apps" || state.symbols[attrPath[0]] == "defaultApp")
? "app" : "derivation";
if (type != expected)
throw Error("attribute '%s' should have type '%s'", cursor->getAttrPathStr(), expected);
if (type == "app") {
auto [program, context] = cursor->getAttr("program")->getStringWithContext();
std::vector<DerivedPath> context2;
for (auto & c : context) {
context2.emplace_back(std::visit(overloaded {
[&](const NixStringContextElem::DrvDeep & d) -> DerivedPath {
/* We want all outputs of the drv */
return DerivedPath::Built {
.drvPath = makeConstantStorePathRef(d.drvPath),
.outputs = OutputsSpec::All {},
};
},
[&](const NixStringContextElem::Built & b) -> DerivedPath {
return DerivedPath::Built {
.drvPath = b.drvPath,
.outputs = OutputsSpec::Names { b.output },
};
},
[&](const NixStringContextElem::Opaque & o) -> DerivedPath {
return DerivedPath::Opaque {
.path = o.path,
};
},
}, c.raw));
}
return UnresolvedApp{App {
.context = std::move(context2),
.program = program,
}};
}
else if (type == "derivation") {
auto drvPath = cursor->forceDerivation();
auto outPath = cursor->getAttr(state.sOutPath)->getString();
auto outputName = cursor->getAttr(state.sOutputName)->getString();
auto name = cursor->getAttr(state.sName)->getString();
auto aPname = cursor->maybeGetAttr("pname");
auto aMeta = cursor->maybeGetAttr(state.sMeta);
auto aMainProgram = aMeta ? aMeta->maybeGetAttr("mainProgram") : nullptr;
auto mainProgram =
aMainProgram
? aMainProgram->getString()
: aPname
? aPname->getString()
: DrvName(name).name;
auto program = outPath + "/bin/" + mainProgram;
return UnresolvedApp { App {
.context = { DerivedPath::Built {
.drvPath = makeConstantStorePathRef(drvPath),
.outputs = OutputsSpec::Names { outputName },
} },
.program = program,
}};
}
else
throw Error("attribute '%s' has unsupported type '%s'", cursor->getAttrPathStr(), type);
}
// FIXME: move to libcmd
App UnresolvedApp::resolve(ref<Store> evalStore, ref<Store> store)
{
auto res = unresolved;
Installables installableContext;
for (auto & ctxElt : unresolved.context)
installableContext.push_back(
make_ref<InstallableDerivedPath>(store, DerivedPath { ctxElt }));
auto builtContext = Installable::build(evalStore, store, Realise::Outputs, installableContext);
res.program = resolveString(*store, unresolved.program, builtContext);
if (!store->isInStore(res.program))
throw Error("app program '%s' is not in the Nix store", res.program);
return res;
}
}
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