2 files changed, 16 insertions, 1 deletions
diff --git a/src/libutil/logging.cc b/src/libutil/logging.cc
index 53f6260b7886..afcc2ec58543 100644
--- a/src/libutil/logging.cc
+++ b/src/libutil/logging.cc
@@ -5,6 +5,11 @@ namespace nix {
 
 Logger * logger = makeDefaultLogger();
 
+void Logger::warn(const std::string & msg)
+{
+    log(lvlInfo, ANSI_RED "warning:" ANSI_NORMAL " " + msg);
+}
+
 class SimpleLogger : public Logger
 {
 public:
@@ -52,7 +57,7 @@ Verbosity verbosity = lvlInfo;
 void warnOnce(bool & haveWarned, const FormatOrString & fs)
 {
     if (!haveWarned) {
-        printError(format("warning: %1%") % fs.s);
+        warn(fs.s);
         haveWarned = true;
     }
 }
diff --git a/src/libutil/logging.hh b/src/libutil/logging.hh
index 3f83664794f7..81aebccdca45 100644
--- a/src/libutil/logging.hh
+++ b/src/libutil/logging.hh
@@ -30,6 +30,8 @@ public:
         log(lvlInfo, fs);
     }
 
+    virtual void warn(const std::string & msg);
+
     virtual void setExpected(const std::string & label, uint64_t value = 1) { }
     virtual void setProgress(const std::string & label, uint64_t value = 1) { }
     virtual void incExpected(const std::string & label, uint64_t value = 1) { }
@@ -82,6 +84,14 @@ extern Verbosity verbosity; /* suppress msgs > this */
 #define debug(args...) printMsg(lvlDebug, args)
 #define vomit(args...) printMsg(lvlVomit, args)
 
+template<typename... Args>
+inline void warn(const std::string & fs, Args... args)
+{
+    boost::format f(fs);
+    formatHelper(f, args...);
+    logger->warn(f.str());
+}
+
 void warnOnce(bool & haveWarned, const FormatOrString & fs);
 
 void writeToStderr(const string & s);