server: fixed log level setting which wasn't working properly

src/server/config/config.go

 package config
 
 import (
+	"nexus-common/buildversion"
 	"nexus-server/logger"
+	"nexus-server/version"
 	"os"
+	"path"
 	"path/filepath"
 	"strings"
 	"sync"
@@ -64,6 +67,12 @@ var once sync.Once
 
 func GetInstance() *Config {
 	once.Do(func() {
+		log.SetLevel(logrus.InfoLevel)
+		var appname = path.Base(os.Args[0])
+		serverVersion := version.Get()
+		log.Info(appname + " version " + serverVersion.String() + " (commit " + buildversion.GitCommit() + ")")
+		log.Info("Built on " + buildversion.BuildDate())
+
 		certsDir := "../certs"
 		configDir := "../config"
 		dataDir := "../data"
@@ -125,14 +134,19 @@ func sanityChecks(c *Config) {
 	switch loglevelStr {
 	case "debug":
 		log.SetLevel(logrus.DebugLevel)
+		log.Debug("Using DEBUG log level")
 	case "info":
 		log.SetLevel(logrus.InfoLevel)
+		log.Info("Using INFO log level")
 	case "warn":
 		log.SetLevel(logrus.WarnLevel)
+		log.Warn("Using WARN log level")
 	case "error":
 		log.SetLevel(logrus.ErrorLevel)
+		log.Error("Using ERROR log level")
 	case "fatal":
 		log.SetLevel(logrus.FatalLevel)
+		log.Fatal("Using debug log level")
 	default:
 		log.Fatal("Config file error: invalid \"log_level\" value")
 	}

src/server/nexus-server.go

 package main
 
 import (
-	"nexus-common/buildversion"
 	"nexus-server/cleaner"
 	"nexus-server/config"
 	"nexus-server/exec"
@@ -9,23 +8,13 @@ import (
 	"nexus-server/router"
 	"nexus-server/users"
 	"nexus-server/utils"
-	"nexus-server/version"
 	"nexus-server/vms"
-	"os"
-	"path"
-
-	"github.com/sirupsen/logrus"
 )
 
 var log = logger.GetInstance()
 
 func main() {
-	log.SetLevel(logrus.InfoLevel)
-
-	var appname = path.Base(os.Args[0])
-	serverVersion := version.Get()
-	log.Info(appname + " version " + serverVersion.String() + " (commit " + buildversion.GitCommit() + ")")
-	log.Info("Built on " + buildversion.BuildDate())
+	conf := config.GetInstance()
 
 	// Initialize the RNG' seed to the current time.
 	utils.RandInit()
@@ -58,7 +47,6 @@ func main() {
 
 	cleaner.Start()
 
-	conf := config.GetInstance()
 	log.Info("Using port range [", conf.Core.VMSpiceMinPort, "-", conf.Core.VMSpiceMaxPort, "]")
 	log.Info("Tmp directory: ", conf.Core.TmpDir)
 

src/server/vms/templates.go

@@ -66,6 +66,7 @@ func InitTemplates() error {
 			continue
 		}
 
+		log.Debug("Found template " + templateDir)
 		templates.m[templateDir] = template
 	}