config.cc: extract parts of applyConfigFile into applyConfig

This moves the actual parsing of configuration contents into applyConfig
which applyConfigFile is then going to call. By changing this we can now
test the configuration file parsing without actually create a file on
disk.

src/libutil/config.cc

@@ -65,11 +65,7 @@ void Config::getSettings(std::map<std::string, SettingInfo> & res, bool override
             res.emplace(opt.first, SettingInfo{opt.second.setting->to_string(), opt.second.setting->description});
 }
 
-void AbstractConfig::applyConfigFile(const Path & path)
+void AbstractConfig::applyConfig(const std::string & contents, const std::string & path) {
-{
-    try {
-        string contents = readFile(path);
-
     unsigned int pos = 0;
 
     while (pos < contents.size()) {
@@ -119,6 +115,13 @@ void AbstractConfig::applyConfigFile(const Path & path)
 
         set(name, concatStringsSep(" ", Strings(i, tokens.end()))); // FIXME: slow
     };
+}
+
+void AbstractConfig::applyConfigFile(const Path & path)
+{
+    try {
+        string contents = readFile(path);
+        applyConfig(contents, path);
     } catch (SysError &) { }
 }
 

src/libutil/config.hh

@@ -33,6 +33,7 @@ public:
 
     virtual void getSettings(std::map<std::string, SettingInfo> & res, bool overridenOnly = false) = 0;
 
+    void applyConfig(const std::string & contents, const std::string & path = "<unknown>");
     void applyConfigFile(const Path & path);
 
     virtual void resetOverriden() = 0;