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Make Drv struct.

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To facilitate collecting and jsonifying derivations in different
contexts
This commit is contained in:
John Soo 2022-04-13 15:41:51 -07:00
parent 192fa87968
commit 8dd6426d15
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GPG key ID: D8A148F8CE4DDBC2
1 changed files with 65 additions and 36 deletions
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101
src/nix-eval-jobs.cc
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@ -173,6 +173,65 @@ Value * topLevelValue(EvalState & state, Bindings & autoArgs) {
: releaseExprTopLevelValue(state, autoArgs);
}
/* The fields of a derivation that are printed in json form */
struct Drv {
std::string name;
std::string system;
std::string drvPath;
std::map<std::string, std::string> outputs;
std::optional<nlohmann::json> meta;
Drv (EvalState & state, DrvInfo & drvInfo) {
if (drvInfo.querySystem() == "unknown")
throw EvalError("derivation must have a 'system' attribute");
auto localStore = state.store.dynamic_pointer_cast<LocalFSStore>();
for (auto out : drvInfo.queryOutputs(true)) {
if (out.second)
outputs[out.first] = localStore->printStorePath(*out.second);
}
if (myArgs.meta) {
nlohmann::json meta_;
for (auto & name : drvInfo.queryMetaNames()) {
PathSet context;
std::stringstream ss;
auto metaValue = drvInfo.queryMeta(name);
// Skip non-serialisable types
// TODO: Fix serialisation of derivations to store paths
if (metaValue == 0) {
continue;
}
printValueAsJSON(state, true, *metaValue, noPos, ss, context);
meta_[name] = nlohmann::json::parse(ss.str());
}
meta = meta_;
}
name = drvInfo.queryName();
system = drvInfo.querySystem();
drvPath = localStore->printStorePath(drvInfo.requireDrvPath());
}
};
static void to_json(nlohmann::json & json, const Drv & drv) {
json = nlohmann::json{
{ "name", drv.name },
{ "system", drv.system },
{ "drvPath", drv.drvPath },
{ "outputs", drv.outputs },
};
if (drv.meta.has_value())
json["meta"] = drv.meta.value();
}
static void worker(
EvalState & state,
Bindings & autoArgs,
@ -202,50 +261,20 @@ static void worker(
auto v = state.allocValue();
state.autoCallFunction(autoArgs, *vTmp, *v);
if (auto drv = getDerivation(state, *v, false)) {
if (drv->querySystem() == "unknown")
throw EvalError("derivation must have a 'system' attribute");
if (auto drvInfo = getDerivation(state, *v, false)) {
auto drv = Drv(state, *drvInfo);
auto localStore = state.store.dynamic_pointer_cast<LocalFSStore>();
auto drvPath = localStore->printStorePath(drv->requireDrvPath());
auto storePath = localStore->parseStorePath(drvPath);
auto outputs = drv->queryOutputs();
auto storePath = localStore->parseStorePath(drv.drvPath);
reply["name"] = drv->queryName();
reply["system"] = drv->querySystem();
reply["drvPath"] = drvPath;
for (auto out : outputs){
if (out.second) {
reply["outputs"][out.first] = localStore->printStorePath(*out.second);
}
}
if (myArgs.meta) {
nlohmann::json meta;
for (auto & name : drv->queryMetaNames()) {
PathSet context;
std::stringstream ss;
auto metaValue = drv->queryMeta(name);
// Skip non-serialisable types
// TODO: Fix serialisation of derivations to store paths
if (metaValue == 0) {
continue;
}
printValueAsJSON(state, true, *metaValue, noPos, ss, context);
nlohmann::json field = nlohmann::json::parse(ss.str());
meta[name] = field;
}
reply["meta"] = meta;
}
reply = drv;
reply["attr"] = attrPath;
/* Register the derivation as a GC root. !!! This
registers roots for jobs that we may have already
done. */
if (myArgs.gcRootsDir != "") {
Path root = myArgs.gcRootsDir + "/" + std::string(baseNameOf(drvPath));
Path root = myArgs.gcRootsDir + "/" + std::string(baseNameOf(drv.drvPath));
if (!pathExists(root))
localStore->addPermRoot(storePath, root);
}