Add name to BasicDerivation

We always have a name for BasicDerivation, since we have a derivation
store path that has a name.

src/libexpr/primops.cc

@@ -102,9 +102,11 @@ static void prim_scopedImport(EvalState & state, const Pos & pos, Value * * args
 
     Path realPath = state.checkSourcePath(state.toRealPath(path, context));
 
+    StorePath storePath = state.store->parseStorePath(path);
+
     // FIXME
-    if (state.store->isStorePath(path) && state.store->isValidPath(state.store->parseStorePath(path)) && isDerivation(path)) {
-        Derivation drv = readDerivation(*state.store, realPath);
+    if (state.store->isStorePath(path) && state.store->isValidPath(storePath) && isDerivation(path)) {
+        Derivation drv = readDerivation(*state.store, realPath, std::string(storePath.name()));
         Value & w = *state.allocValue();
         state.mkAttrs(w, 3 + drv.outputs.size());
         Value * v2 = state.allocAttr(w, state.sDrvPath);

src/libstore/daemon.cc

@@ -474,7 +474,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
     case wopBuildDerivation: {
         auto drvPath = store->parseStorePath(readString(from));
         BasicDerivation drv;
-        readDerivation(from, *store, drv);
+        readDerivation(from, *store, drv, std::string(drvPath.name()));
         BuildMode buildMode = (BuildMode) readInt(from);
         logger->startWork();
         if (!trusted)

src/libstore/derivations.cc

@@ -129,9 +129,11 @@ static DerivationOutput parseDerivationOutput(const Store & store, istringstream
 }
 
 
-static Derivation parseDerivation(const Store & store, const string & s)
+static Derivation parseDerivation(const Store & store, const string & s, string name)
 {
     Derivation drv;
+    drv.name = name;
+
     istringstream_nocopy str(s);
     expect(str, "Derive([");
 
@@ -175,10 +177,10 @@ static Derivation parseDerivation(const Store & store, const string & s)
 }
 
 
-Derivation readDerivation(const Store & store, const Path & drvPath)
+Derivation readDerivation(const Store & store, const Path & drvPath, std::string name)
 {
     try {
-        return parseDerivation(store, readFile(drvPath));
+        return parseDerivation(store, readFile(drvPath), name);
     } catch (FormatError & e) {
         throw Error("error parsing derivation '%1%': %2%", drvPath, e.msg());
     }
@@ -196,7 +198,7 @@ Derivation Store::readDerivation(const StorePath & drvPath)
 {
     auto accessor = getFSAccessor();
     try {
-        return parseDerivation(*this, accessor->readFile(printStorePath(drvPath)));
+        return parseDerivation(*this, accessor->readFile(printStorePath(drvPath)), std::string(drvPath.name()));
     } catch (FormatError & e) {
         throw Error("error parsing derivation '%s': %s", printStorePath(drvPath), e.msg());
     }
@@ -369,7 +371,7 @@ Hash hashDerivationModulo(Store & store, const Derivation & drv, bool maskOutput
         if (h == drvHashes.end()) {
             assert(store.isValidPath(i.first));
             h = drvHashes.insert_or_assign(i.first, hashDerivationModulo(store,
-                store.readDerivation(i.first), false)).first;
+                    store.readDerivation(i.first), false)).first;
         }
         inputs2.insert_or_assign(h->second.to_string(Base16, false), i.second);
     }
@@ -435,8 +437,10 @@ StringSet BasicDerivation::outputNames() const
 }
 
 
-Source & readDerivation(Source & in, const Store & store, BasicDerivation & drv)
+Source & readDerivation(Source & in, const Store & store, BasicDerivation & drv, string name)
 {
+    drv.name = name;
+
     drv.outputs.clear();
     auto nr = readNum<size_t>(in);
     for (size_t n = 0; n < nr; n++) {

src/libstore/derivations.hh

@@ -35,6 +35,7 @@ struct BasicDerivation
     Path builder;
     Strings args;
     StringPairs env;
+    string name;
 
     BasicDerivation() { }
     virtual ~BasicDerivation() { };
@@ -76,7 +77,7 @@ StorePath writeDerivation(ref<Store> store,
     const Derivation & drv, std::string_view name, RepairFlag repair = NoRepair);
 
 /* Read a derivation from a file. */
-Derivation readDerivation(const Store & store, const Path & drvPath);
+Derivation readDerivation(const Store & store, const Path & drvPath, string name);
 
 // FIXME: remove
 bool isDerivation(const string & fileName);
@@ -93,7 +94,7 @@ bool wantOutput(const string & output, const std::set<string> & wanted);
 struct Source;
 struct Sink;
 
-Source & readDerivation(Source & in, const Store & store, BasicDerivation & drv);
+Source & readDerivation(Source & in, const Store & store, BasicDerivation & drv, string name);
 void writeDerivation(Sink & out, const Store & store, const BasicDerivation & drv);
 
 std::string hashPlaceholder(const std::string & outputName);

src/nix-store/nix-store.cc

@@ -914,9 +914,9 @@ static void opServe(Strings opFlags, Strings opArgs)
 
                 if (!writeAllowed) throw Error("building paths is not allowed");
 
-                auto drvPath = store->parseStorePath(readString(in)); // informational only
+                auto drvPath = store->parseStorePath(readString(in));
                 BasicDerivation drv;
-                readDerivation(in, *store, drv);
+                readDerivation(in, *store, drv, std::string(drvPath.name()));
 
                 getBuildSettings();
 

src/nix/repl.cc

@@ -483,7 +483,7 @@ bool NixRepl::processLine(string line)
                but doing it in a child makes it easier to recover from
                problems / SIGINT. */
             if (runProgram(settings.nixBinDir + "/nix", Strings{"build", "--no-link", drvPath}) == 0) {
-                auto drv = readDerivation(*state->store, drvPath);
+                auto drv = readDerivation(*state->store, drvPath, std::string(state->store->parseStorePath(drvPath).name()));
                 std::cout << std::endl << "this derivation produced the following outputs:" << std::endl;
                 for (auto & i : drv.outputs)
                     std::cout << fmt("  %s -> %s\n", i.first, state->store->printStorePath(i.second.path));