Merge changes I29e66ad8,I77ea62cd,I7cd58d92 into main

* changes:
  treewide: make more settings conditionally available
  libstore/build: only send overridden settings to the build hook
  treewide: consistently mark overridden settings as such

src/libutil/config-impl.hh

@@ -65,6 +65,7 @@ void BaseSetting<T>::appendOrSet(T newValue, bool append, const ApplyConfigOptio
         "using default `appendOrSet` implementation with an appendable type");
     assert(!append);
 
+    overridden = true;
     value = std::move(newValue);
 }
 
@@ -85,6 +86,13 @@ void BaseSetting<T>::set(const std::string & str, bool append, const ApplyConfig
     }
 }
 
+template<typename T>
+void BaseSetting<T>::override(const T & v)
+{
+    overridden = true;
+    value = v;
+}
+
 template<> void BaseSetting<bool>::convertToArg(Args & args, const std::string & category);
 
 template<typename T>
@@ -95,7 +103,7 @@ void BaseSetting<T>::convertToArg(Args & args, const std::string & category)
         .description = fmt("Set the `%s` setting.", name),
         .category = category,
         .labels = {"value"},
-        .handler = {[this](std::string s) { overridden = true; set(s); }},
+        .handler = {[this](std::string s) { set(s); }},
         .experimentalFeature = experimentalFeature,
     });
 
@@ -105,7 +113,7 @@ void BaseSetting<T>::convertToArg(Args & args, const std::string & category)
             .description = fmt("Append to the `%s` setting.", name),
             .category = category,
             .labels = {"value"},
-            .handler = {[this](std::string s) { overridden = true; set(s, true); }},
+            .handler = {[this](std::string s) { set(s, true); }},
             .experimentalFeature = experimentalFeature,
         });
 }

src/libutil/config.cc

@@ -32,7 +32,6 @@ bool Config::set(const std::string & name, const std::string & value, const Appl
             return false;
     }
     i->second.setting->set(value, append, options);
-    i->second.setting->overridden = true;
     return true;
 }
 
@@ -46,7 +45,6 @@ void Config::addSetting(AbstractSetting * setting)
 
     if (auto i = unknownSettings.find(setting->name); i != unknownSettings.end()) {
         setting->set(std::move(i->second));
-        setting->overridden = true;
         unknownSettings.erase(i);
         set = true;
     }
@@ -58,7 +56,6 @@ void Config::addSetting(AbstractSetting * setting)
                     alias, setting->name);
             else {
                 setting->set(std::move(i->second));
-                setting->overridden = true;
                 unknownSettings.erase(i);
                 set = true;
             }
@@ -80,7 +77,7 @@ void AbstractConfig::reapplyUnknownSettings()
 {
     auto unknownSettings2 = std::move(unknownSettings);
     unknownSettings = {};
-    for (auto & s : unknownSettings2)
+        for (auto & s : unknownSettings2)
         set(s.first, s.second);
 }
 

src/libutil/config.hh

@@ -218,6 +218,7 @@ protected:
     virtual void convertToArg(Args & args, const std::string & category);
 
     bool isOverridden() const;
+
 };
 
 /**
@@ -267,16 +268,12 @@ public:
     { }
 
     operator const T &() const { return value; }
-    operator T &() { return value; }
     const T & get() const { return value; }
     template<typename U>
     bool operator ==(const U & v2) const { return value == v2; }
     template<typename U>
     bool operator !=(const U & v2) const { return value != v2; }
     template<typename U>
-    void operator =(const U & v) { assign(v); }
-    virtual void assign(const T & v) { value = v; }
-    template<typename U>
     void setDefault(const U & v) { if (!overridden) value = v; }
 
     /**
@@ -287,6 +284,8 @@ public:
      */
     void set(const std::string & str, bool append = false, const ApplyConfigOptions & options = {}) override final;
 
+    void override(const T & v);
+
     /**
      * C++ trick; This is template-specialized to compile-time indicate whether
      * the type is appendable.
@@ -299,12 +298,6 @@ public:
      */
     bool isAppendable() override final;
 
-    virtual void override(const T & v)
-    {
-        overridden = true;
-        value = v;
-    }
-
     std::string to_string() const override;
 
     void convertToArg(Args & args, const std::string & category) override;
@@ -349,8 +342,6 @@ public:
         : Setting(options, def, name, description, aliases, documentDefault, std::move(experimentalFeature), true)
     {
     }
-
-    void operator =(const T & v) { this->assign(v); }
 };
 
 /**
@@ -375,8 +366,6 @@ public:
     }
 
     T parse(const std::string & str, const ApplyConfigOptions & options) const override;
-
-    void operator =(const T & v) { this->assign(v); }
 };