Unify the printing of the logs between bar-with-logs and raw

Make the printing of the build logs systematically go through the
logger, and replicate the behavior of `no-build-output` by having two
different loggers (one that prints the build logs and one that doesn't)

src/libmain/loggers.cc

@@ -8,6 +8,8 @@ LogFormat defaultLogFormat = LogFormat::raw;
 LogFormat parseLogFormat(const string &logFormatStr) {
     if (logFormatStr == "raw")
         return LogFormat::raw;
+    else if (logFormatStr == "raw-with-logs")
+        return LogFormat::rawWithLogs;
     else if (logFormatStr == "internal-json")
         return LogFormat::internalJson;
     else if (logFormatStr == "bar")
@@ -21,7 +23,9 @@ LogFormat parseLogFormat(const string &logFormatStr) {
 Logger *makeDefaultLogger() {
     switch (defaultLogFormat) {
     case LogFormat::raw:
-        return makeSimpleLogger();
+        return makeSimpleLogger(false);
+    case LogFormat::rawWithLogs:
+        return makeSimpleLogger(true);
     case LogFormat::internalJson:
         return makeJSONLogger(*makeSimpleLogger());
     case LogFormat::bar:

src/libmain/loggers.hh

@@ -6,6 +6,7 @@ namespace nix {
 
 enum class LogFormat {
   raw,
+  rawWithLogs,
   internalJson,
   bar,
   barWithLogs,

src/libmain/shared.cc

@@ -2,6 +2,7 @@
 #include "shared.hh"
 #include "store-api.hh"
 #include "util.hh"
+#include "loggers.hh"
 
 #include <algorithm>
 #include <cctype>
@@ -169,7 +170,7 @@ LegacyArgs::LegacyArgs(const std::string & programName,
         .longName = "no-build-output",
         .shortName = 'Q',
         .description = "do not show build output",
-        .handler = {&settings.verboseBuild, false},
+        .handler = {[&]() {setLogFormat(LogFormat::raw); }},
     });
 
     addFlag({

src/libstore/build.cc

@@ -1642,7 +1642,7 @@ void DerivationGoal::buildDone()
                 worker.store.printStorePath(drvPath),
                 statusToString(status));
 
-            if (!settings.verboseBuild && !logTail.empty()) {
+            if (!logger->isVerbose() && !logTail.empty()) {
                 msg += (format("; last %d log lines:") % logTail.size()).str();
                 for (auto & line : logTail)
                     msg += "\n  " + line;
@@ -1691,11 +1691,7 @@ void DerivationGoal::buildDone()
                 }
 
                 void flushLine() {
-                    if (settings.verboseBuild) {
-                        printError("post-build-hook: " + currentLine);
-                    } else {
-                        act.result(resPostBuildLogLine, currentLine);
-                    }
+                    act.result(resPostBuildLogLine, currentLine);
                     currentLine.clear();
                 }
 
@@ -4155,13 +4151,8 @@ void DerivationGoal::flushLine()
         ;
 
     else {
-        if (settings.verboseBuild &&
-            (settings.printRepeatedBuilds || curRound == 1))
-            printError(currentLogLine);
-        else {
-            logTail.push_back(currentLogLine);
-            if (logTail.size() > settings.logLines) logTail.pop_front();
-        }
+        logTail.push_back(currentLogLine);
+        if (logTail.size() > settings.logLines) logTail.pop_front();
 
         act->result(resBuildLogLine, currentLogLine);
     }

src/libutil/logging.cc

@@ -18,7 +18,7 @@ void setCurActivity(const ActivityId activityId)
     curActivity = activityId;
 }
 
-Logger * logger = makeSimpleLogger();
+Logger * logger = makeSimpleLogger(true);
 
 void Logger::warn(const std::string & msg)
 {
@@ -35,13 +35,19 @@ class SimpleLogger : public Logger
 public:
 
     bool systemd, tty;
+    bool printBuildLogs;
 
-    SimpleLogger()
+    SimpleLogger(bool printBuildLogs)
+        : printBuildLogs(printBuildLogs)
     {
         systemd = getEnv("IN_SYSTEMD") == "1";
         tty = isatty(STDERR_FILENO);
     }
 
+    bool isVerbose() override {
+        return printBuildLogs;
+    }
+
     void log(Verbosity lvl, const FormatOrString & fs) override
     {
         if (lvl > verbosity) return;
@@ -70,6 +76,18 @@ public:
         if (lvl <= verbosity && !s.empty())
             log(lvl, s + "...");
     }
+
+    void result(ActivityId act, ResultType type, const Fields & fields) override
+    {
+        if (type == resBuildLogLine && printBuildLogs) {
+            auto lastLine = fields[0].s;
+            printError(lastLine);
+        }
+        else if (type == resPostBuildLogLine && printBuildLogs) {
+            auto lastLine = fields[0].s;
+            printError("post-build-hook: " + lastLine);
+        }
+    }
 };
 
 Verbosity verbosity = lvlInfo;
@@ -94,9 +112,9 @@ void writeToStderr(const string & s)
     }
 }
 
-Logger * makeSimpleLogger()
+Logger * makeSimpleLogger(bool printBuildLogs)
 {
-    return new SimpleLogger();
+    return new SimpleLogger(printBuildLogs);
 }
 
 std::atomic<uint64_t> nextId{(uint64_t) getpid() << 32};
@@ -114,6 +132,10 @@ struct JSONLogger : Logger
 
     JSONLogger(Logger & prevLogger) : prevLogger(prevLogger) { }
 
+    bool isVerbose() override {
+        return true;
+    }
+
     void addFields(nlohmann::json & json, const Fields & fields)
     {
         if (fields.empty()) return;

src/libutil/logging.hh

@@ -65,6 +65,9 @@ public:
 
     virtual void stop() { };
 
+    // Whether the logger prints the whole build log
+    virtual bool isVerbose() { return false; }
+
     virtual void log(Verbosity lvl, const FormatOrString & fs) = 0;
 
     void log(const FormatOrString & fs)
@@ -143,7 +146,7 @@ struct PushActivity
 
 extern Logger * logger;
 
-Logger * makeSimpleLogger();
+Logger * makeSimpleLogger(bool printBuildLogs = true);
 
 Logger * makeJSONLogger(Logger & prevLogger);
 

src/nix/progress-bar.cc

@@ -119,6 +119,10 @@ public:
         quitCV.notify_one();
     }
 
+    bool isVerbose() override {
+        return printBuildLogs;
+    }
+
     void log(Verbosity lvl, const FormatOrString & fs) override
     {
         auto state(state_.lock());