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Use more std::visit to prepare for new variant

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N.B. not using `std::visit` for fetchurl because there is no attempt to
handle all the cases (e.g. no `else`) and lambda complicates early
return.
This commit is contained in:
John Ericson 2020-07-12 16:12:21 +00:00
parent ffc18583b1
commit fedfc913ad
3 changed files with 32 additions and 18 deletions
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26
src/libstore/derivations.cc
View file

@ -283,13 +283,16 @@ string Derivation::unparse(const Store & store, bool maskOutputs,
if (first) first = false; else s += ',';
s += '('; printUnquotedString(s, i.first);
s += ','; printUnquotedString(s, maskOutputs ? "" : store.printStorePath(i.second.path(store, name)));
if (auto hash = std::get_if<DerivationOutputFixed>(&i.second.output)) {
s += ','; printUnquotedString(s, hash->hash.printMethodAlgo());
s += ','; printUnquotedString(s, hash->hash.hash.to_string(Base16, false));
} else {
std::visit(overloaded {
[&](DerivationOutputInputAddressed doi) {
s += ','; printUnquotedString(s, "");
s += ','; printUnquotedString(s, "");
}
},
[&](DerivationOutputFixed dof) {
s += ','; printUnquotedString(s, dof.hash.printMethodAlgo());
s += ','; printUnquotedString(s, dof.hash.hash.to_string(Base16, false));
},
}, i.second.output);
s += ')';
}
@ -503,12 +506,15 @@ void writeDerivation(Sink & out, const Store & store, const BasicDerivation & dr
for (auto & i : drv.outputs) {
out << i.first
<< store.printStorePath(i.second.path(store, drv.name));
if (auto hash = std::get_if<DerivationOutputFixed>(&i.second.output)) {
out << hash->hash.printMethodAlgo()
<< hash->hash.hash.to_string(Base16, false);
} else {
std::visit(overloaded {
[&](DerivationOutputInputAddressed doi) {
out << "" << "";
}
},
[&](DerivationOutputFixed dof) {
out << dof.hash.printMethodAlgo()
<< dof.hash.hash.to_string(Base16, false);
},
}, i.second.output);
}
writeStorePaths(store, out, drv.inputSrcs);
out << drv.platform << drv.builder << drv.args;

5
src/libstore/derivations.hh
View file

@ -25,7 +25,10 @@ struct DerivationOutputFixed
struct DerivationOutput
{
std::variant<DerivationOutputInputAddressed, DerivationOutputFixed> output;
std::variant<
DerivationOutputInputAddressed,
DerivationOutputFixed
> output;
StorePath path(const Store & store, std::string_view drvName) const;
};

13
src/nix/show-derivation.cc
View file

@ -70,10 +70,15 @@ struct CmdShowDerivation : InstallablesCommand
for (auto & output : drv.outputs) {
auto outputObj(outputsObj.object(output.first));
outputObj.attr("path", store->printStorePath(output.second.path(*store, drv.name)));
if (auto hash = std::get_if<DerivationOutputFixed>(&output.second.output)) {
outputObj.attr("hashAlgo", hash->hash.printMethodAlgo());
outputObj.attr("hash", hash->hash.hash.to_string(Base16, false));
}
std::visit(overloaded {
[&](DerivationOutputInputAddressed doi) {
},
[&](DerivationOutputFixed dof) {
outputObj.attr("hashAlgo", dof.hash.printMethodAlgo());
outputObj.attr("hash", dof.hash.hash.to_string(Base16, false));
},
}, output.second.output);
}
}