Refactor installables

InstallableValue has children InstallableFlake and InstallableAttrPath, but InstallableFlake was overriding toDerivations, and usage was changed so that InstallableFlake didn't need cmd. So these changes were made:
InstallableValue::toDerivations() -> InstalllableAttrPath::toDerivations()
InstallableValue::cmd -> InstallableAttrPath::cmd

InstallableValue uses state instead of cmd

toBuildables() and toDerivations() were made abstract

src/nix/installables.cc

@@ -179,10 +179,8 @@ struct InstallableStorePath : Installable
     }
 };
 
-std::vector<InstallableValue::DerivationInfo> InstallableValue::toDerivations()
+std::vector<InstallableValue::DerivationInfo> InstallableAttrPath::toDerivations()
 {
-    auto state = cmd.getEvalState();
-
     auto v = toValue(*state).first;
 
     Bindings & autoArgs = *cmd.getAutoArgs(*state);
@@ -204,8 +202,6 @@ std::vector<InstallableValue::DerivationInfo> InstallableValue::toDerivations()
 
 Buildables InstallableValue::toBuildables()
 {
-    auto state = cmd.getEvalState();
-
     Buildables res;
 
     StorePathSet drvPaths;
@@ -239,11 +235,12 @@ Buildables InstallableValue::toBuildables()
 
 struct InstallableAttrPath : InstallableValue
 {
+    SourceExprCommand & cmd;
     RootValue v;
     std::string attrPath;
 
-    InstallableAttrPath(SourceExprCommand & cmd, Value * v, const std::string & attrPath)
-        : InstallableValue(cmd), v(allocRootValue(v)), attrPath(attrPath)
+    InstallableAttrPath(ref<EvalState> state, SourceExprCommand & cmd, Value * v, const std::string & attrPath)
+        : InstallableValue(state), cmd(cmd), v(allocRootValue(v)), attrPath(attrPath)
     { }
 
     std::string what() override { return attrPath; }
@@ -254,6 +251,8 @@ struct InstallableAttrPath : InstallableValue
         state.forceValue(*vRes);
         return {vRes, pos};
     }
+
+    virtual std::vector<InstallableValue::DerivationInfo> toDerivations() override;
 };
 
 std::vector<std::string> InstallableFlake::getActualAttrPaths()
@@ -313,10 +312,9 @@ ref<eval_cache::EvalCache> openEvalCache(
 
 std::tuple<std::string, FlakeRef, InstallableValue::DerivationInfo> InstallableFlake::toDerivation()
 {
-    auto state = cmd.getEvalState();
 
     auto lockedFlake = std::make_shared<flake::LockedFlake>(
-        lockFlake(*state, flakeRef, cmd.lockFlags));
+        lockFlake(*state, flakeRef, lockFlags));
 
     auto cache = openEvalCache(*state, lockedFlake, true);
     auto root = cache->getRoot();
@@ -362,7 +360,7 @@ std::vector<InstallableValue::DerivationInfo> InstallableFlake::toDerivations()
 
 std::pair<Value *, Pos> InstallableFlake::toValue(EvalState & state)
 {
-    auto lockedFlake = lockFlake(state, flakeRef, cmd.lockFlags);
+    auto lockedFlake = lockFlake(state, flakeRef, lockFlags);
 
     auto vOutputs = getFlakeOutputs(state, lockedFlake);
 
@@ -385,7 +383,7 @@ std::vector<std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>>
 InstallableFlake::getCursor(EvalState & state, bool useEvalCache)
 {
     auto evalCache = openEvalCache(state,
-        std::make_shared<flake::LockedFlake>(lockFlake(state, flakeRef, cmd.lockFlags)),
+        std::make_shared<flake::LockedFlake>(lockFlake(state, flakeRef, lockFlags)),
         useEvalCache);
 
     auto root = evalCache->getRoot();
@@ -423,7 +421,7 @@ std::vector<std::shared_ptr<Installable>> SourceExprCommand::parseInstallables(
         }
 
         for (auto & s : ss)
-            result.push_back(std::make_shared<InstallableAttrPath>(*this, vFile, s == "." ? "" : s));
+            result.push_back(std::make_shared<InstallableAttrPath>(state, *this, vFile, s == "." ? "" : s));
 
     } else {
 
@@ -433,9 +431,9 @@ std::vector<std::shared_ptr<Installable>> SourceExprCommand::parseInstallables(
             try {
                 auto [flakeRef, fragment] = parseFlakeRefWithFragment(s, absPath("."));
                 result.push_back(std::make_shared<InstallableFlake>(
-                        *this, std::move(flakeRef),
+                        getEvalState(), std::move(flakeRef),
                         fragment == "" ? getDefaultFlakeAttrPaths() : Strings{fragment},
-                        getDefaultFlakeAttrPathPrefixes()));
+                        getDefaultFlakeAttrPathPrefixes(), lockFlags));
                 continue;
             } catch (...) {
                 ex = std::current_exception();

src/nix/installables.hh

@@ -37,10 +37,7 @@ struct Installable
 
     virtual std::string what() = 0;
 
-    virtual Buildables toBuildables()
-    {
-        throw Error("argument '%s' cannot be built", what());
-    }
+    virtual Buildables toBuildables() = 0;
 
     Buildable toBuildable();
 
@@ -64,9 +61,9 @@ struct Installable
 
 struct InstallableValue : Installable
 {
-    SourceExprCommand & cmd;
+    ref<EvalState> state;
 
-    InstallableValue(SourceExprCommand & cmd) : cmd(cmd) { }
+    InstallableValue(ref<EvalState> state) : state(state) {}
 
     struct DerivationInfo
     {
@@ -75,7 +72,7 @@ struct InstallableValue : Installable
         std::string outputName;
     };
 
-    virtual std::vector<DerivationInfo> toDerivations();
+    virtual std::vector<DerivationInfo> toDerivations() = 0;
 
     Buildables toBuildables() override;
 };
@@ -85,11 +82,12 @@ struct InstallableFlake : InstallableValue
     FlakeRef flakeRef;
     Strings attrPaths;
     Strings prefixes;
+    const flake::LockFlags & lockFlags;
 
-    InstallableFlake(SourceExprCommand & cmd, FlakeRef && flakeRef,
-        Strings && attrPaths, Strings && prefixes)
-        : InstallableValue(cmd), flakeRef(flakeRef), attrPaths(attrPaths),
-          prefixes(prefixes)
+    InstallableFlake(ref<EvalState> state, FlakeRef && flakeRef,
+        Strings && attrPaths, Strings && prefixes, const flake::LockFlags & lockFlags)
+        : InstallableValue(state), flakeRef(flakeRef), attrPaths(attrPaths),
+          prefixes(prefixes), lockFlags(lockFlags)
     { }
 
     std::string what() override { return flakeRef.to_string() + "#" + *attrPaths.begin(); }

src/nix/profile.cc

@@ -336,7 +336,7 @@ struct CmdProfileUpgrade : virtual SourceExprCommand, MixDefaultProfile, MixProf
                 Activity act(*logger, lvlChatty, actUnknown,
                     fmt("checking '%s' for updates", element.source->attrPath));
 
-                InstallableFlake installable(*this, FlakeRef(element.source->originalRef), {element.source->attrPath}, {});
+                InstallableFlake installable(getEvalState(), FlakeRef(element.source->originalRef), {element.source->attrPath}, {}, lockFlags);
 
                 auto [attrPath, resolvedRef, drv] = installable.toDerivation();