Merge remote-tracking branch 'origin/master' into lazy-trees

src/libcmd/command.cc

@@ -127,6 +127,16 @@ ref<EvalState> EvalCommand::getEvalState()
     return ref<EvalState>(evalState);
 }
 
+MixOperateOnOptions::MixOperateOnOptions()
+{
+    addFlag({
+        .longName = "derivation",
+        .description = "Operate on the [store derivation](../../glossary.md#gloss-store-derivation) rather than its outputs.",
+        .category = installablesCategory,
+        .handler = {&operateOn, OperateOn::Derivation},
+    });
+}
+
 BuiltPathsCommand::BuiltPathsCommand(bool recursive)
     : recursive(recursive)
 {