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Use std::optional

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This commit is contained in:
Eelco Dolstra 2020-09-18 13:39:17 +02:00
parent 73176ab160
commit f731443384
1 changed files with 5 additions and 5 deletions
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10
src/nix/build.cc
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@ -8,7 +8,7 @@ using namespace nix;
struct CmdBuild : InstallablesCommand, MixDryRun, MixProfile
{
Path outLink = "result";
std::optional<Path> outLink = "result";
BuildMode buildMode = bmNormal;
CmdBuild()
@ -25,7 +25,7 @@ struct CmdBuild : InstallablesCommand, MixDryRun, MixProfile
addFlag({
.longName = "no-link",
.description = "do not create a symlink to the build result",
.handler = {&outLink, Path("")},
.handler = {&outLink, {}},
});
addFlag({
@ -64,19 +64,19 @@ struct CmdBuild : InstallablesCommand, MixDryRun, MixProfile
if (dryRun) return;
if (outLink != "")
if (outLink)
if (auto store2 = store.dynamic_pointer_cast<LocalFSStore>())
for (size_t i = 0; i < buildables.size(); ++i)
std::visit(overloaded {
[&](BuildableOpaque bo) {
std::string symlink = outLink;
std::string symlink = *outLink;
if (i) symlink += fmt("-%d", i);
store2->addPermRoot(bo.path, absPath(symlink));
},
[&](BuildableFromDrv bfd) {
auto builtOutputs = store->queryDerivationOutputMap(bfd.drvPath);
for (auto & output : builtOutputs) {
std::string symlink = outLink;
std::string symlink = *outLink;
if (i) symlink += fmt("-%d", i);
if (output.first != "out") symlink += fmt("-%s", output.first);
store2->addPermRoot(output.second, absPath(symlink));