feat: add logging framework

cmd/ocmTransfer.go

@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"github.com/openmcp-project/bootstrapper/internal/log"
 	ocmcli "github.com/openmcp-project/bootstrapper/internal/ocm-cli"
 
 	"github.com/spf13/cobra"
@@ -20,6 +21,10 @@ var ocmTransferCmd = &cobra.Command{
 		"target",
 	},
 	RunE: func(cmd *cobra.Command, args []string) error {
+		log := log.GetLogger()
+
+		log.Debugf("Executing ocmTransfer with source: %s, target: %s", args[0], args[1])
+
 		transferCommands := []string{
 			"transfer",
 			"componentversion",

cmd/root.go

@@ -4,9 +4,11 @@ import (
 	"os"
 
 	"github.com/spf13/cobra"
+
+	"github.com/openmcp-project/bootstrapper/internal/log"
 )
 
-// rootCmd represents the base command when called without any subcommands
+// RootCmd represents the base command when called without any subcommands
 var RootCmd = &cobra.Command{
 	Use:   "openmcp-bootstrapper",
 	Short: "The openMCP bootstrapper CLI",
@@ -27,13 +29,13 @@ func Execute() {
 }
 
 func init() {
-	// Here you will define your flags and configuration settings.
-	// Cobra supports persistent flags, which, if defined here,
-	// will be global for your application.
-
-	// rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.bootstrapper.yaml)")
-
-	// Cobra also supports local flags, which will only run
-	// when this action is called directly.
-	// RootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+	RootCmd.PersistentFlags().StringP("verbosity", "v", "info", "Set the verbosity level (panic, fatal, error, warn, info, debug, trace)")
+	cobra.OnInitialize(func() {
+		verbosity, err := RootCmd.PersistentFlags().GetString("verbosity")
+		if err != nil {
+			log.InitLogger("info")
+			return
+		}
+		log.InitLogger(verbosity)
+	})
 }

go.mod

@@ -3,6 +3,7 @@ module github.com/openmcp-project/bootstrapper
 go 1.25.0
 
 require (
+	github.com/sirupsen/logrus v1.9.3
 	github.com/spf13/cobra v1.9.1
 	github.com/stretchr/testify v1.10.0
 	k8s.io/utils v0.0.0-20250604170112-4c0f3b243397
@@ -15,5 +16,6 @@ require (
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/spf13/pflag v1.0.7 // indirect
 	go.yaml.in/yaml/v2 v2.4.2 // indirect
+	golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,4 +1,5 @@
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
@@ -8,19 +9,26 @@ github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLf
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
+github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
 github.com/spf13/cobra v1.9.1 h1:CXSaggrXdbHK9CF+8ywj8Amf7PBRmPCOJugH954Nnlo=
 github.com/spf13/cobra v1.9.1/go.mod h1:nDyEzZ8ogv936Cinf6g1RU9MRY64Ir93oCnqb9wxYW0=
 github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/pflag v1.0.7 h1:vN6T9TfwStFPFM5XzjsvmzZkLuaLX+HS+0SeFLRgU6M=
 github.com/spf13/pflag v1.0.7/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 go.yaml.in/yaml/v2 v2.4.2 h1:DzmwEr2rDGHl7lsFgAHxmNz/1NlQ7xLIrlN2h5d1eGI=
 go.yaml.in/yaml/v2 v2.4.2/go.mod h1:081UH+NErpNdqlCXm3TtEran0rJZGxAYx9hb/ELlsPU=
 go.yaml.in/yaml/v3 v3.0.3 h1:bXOww4E/J3f66rav3pX3m8w6jDE4knZjGOw8b5Y6iNE=
 go.yaml.in/yaml/v3 v3.0.3/go.mod h1:tBHosrYAkRZjRAOREWbDnBXUf08JOwYq++0QNwQiWzI=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 h1:0A+M6Uqn+Eje4kHMK80dtF3JCXC4ykBgQG4Fe06QRhQ=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 k8s.io/utils v0.0.0-20250604170112-4c0f3b243397 h1:hwvWFiBzdWw1FhfY1FooPn3kzWuJ8tmbZBHi4zVsl1Y=

internal/log/logger.go

@@ -0,0 +1,68 @@
+package log
+
+import (
+	"os"
+	"sync"
+
+	"github.com/sirupsen/logrus"
+)
+
+var (
+	logger          *logrus.Logger
+	loggerOnce      sync.Once
+	levelPrintNames = map[logrus.Level]string{
+		logrus.PanicLevel: "Panic",
+		logrus.FatalLevel: "Fatal",
+		logrus.ErrorLevel: "Error",
+		logrus.WarnLevel:  "Warn",
+		logrus.InfoLevel:  "Info",
+		logrus.DebugLevel: "Debug",
+		logrus.TraceLevel: "Trace",
+	}
+	levelFlagNames = map[string]logrus.Level{
+		"panic": logrus.PanicLevel,
+		"fatal": logrus.FatalLevel,
+		"error": logrus.ErrorLevel,
+		"warn":  logrus.WarnLevel,
+		"info":  logrus.InfoLevel,
+		"debug": logrus.DebugLevel,
+		"trace": logrus.TraceLevel,
+	}
+)
+
+// customFormatter implements logrus.Formatter to print errors in the format: Error: message
+// and other levels as usual.
+type customFormatter struct{}
+
+func (f *customFormatter) Format(entry *logrus.Entry) ([]byte, error) {
+	level, ok := levelPrintNames[entry.Level]
+	if !ok {
+		level = entry.Level.String()
+	}
+	return []byte(level + ": " + entry.Message + "\n"), nil
+}
+
+// GetLogger returns a singleton logrus.Logger instance
+func GetLogger() *logrus.Logger {
+	loggerOnce.Do(func() {
+		logger = logrus.New()
+		logger.SetLevel(logrus.InfoLevel)
+		logger.SetFormatter(&customFormatter{})
+	})
+	return logger
+}
+
+// SetLevel sets the log level for the logger
+func SetLevel(level logrus.Level) {
+	GetLogger().SetLevel(level)
+}
+
+// InitLogger sets the log level based on the verbosity string and exits on error
+func InitLogger(verbosity string) {
+	level, ok := levelFlagNames[verbosity]
+	if !ok {
+		GetLogger().Error("Unknown verbosity level: " + verbosity)
+		os.Exit(1)
+	}
+	SetLevel(level)
+}