Issue with gitignore

Author: MatteoMori

.gitignore

@@ -8,8 +8,8 @@
 *.so
 *.dylib
 
-# Project binary
-sentinel
+# Project binary (only in root directory)
+/sentinel
 
 # Test binary, built with `go test -c`
 *.test

cmd/sentinel/root.go

@@ -0,0 +1,24 @@
+package sentinel
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+var rootCmd = &cobra.Command{
+	Use:   "sentinel",
+	Short: "Sentinel is a Kubernetes controller that tracks container images across workloads",
+	Long:  `Sentinel is a Kubernetes controller that tracks container images across your cluster and exposes them as Prometheus metrics`,
+	Run: func(cmd *cobra.Command, args []string) {
+
+	},
+}
+
+func Execute() {
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Fprintf(os.Stderr, "Whoops. There was an error while executing your CLI '%s'", err)
+		os.Exit(1)
+	}
+}

cmd/sentinel/start.go

@@ -0,0 +1,76 @@
+package sentinel
+
+import (
+	"log/slog"
+
+	"github.com/MatteoMori/sentinel/pkg/sentinel"
+	sentinelShared "github.com/MatteoMori/sentinel/pkg/shared"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var config sentinelShared.Config
+
+var startSentinel = &cobra.Command{
+	Use:     "start",
+	Aliases: []string{"start"},
+	Short:   "Start Sentinel controller",
+	Args:    cobra.ExactArgs(0), // 0 arguments
+	Run: func(cmd *cobra.Command, args []string) {
+		sentinel.Start(config)
+	},
+}
+
+func init() {
+	cobra.OnInitialize(initConfig)
+	rootCmd.PersistentFlags().IntP("verbosity", "v", 0, "verbosity level (0-2)")
+
+	// Viper bindings to Flags
+	// This allows Viper to read the flags set by Cobra and use them in the configuration
+	viper.BindPFlag("namespaceSelector", rootCmd.PersistentFlags().Lookup("namespaceSelector"))
+	viper.BindPFlag("metricsPort", rootCmd.PersistentFlags().Lookup("metricsPort"))
+	viper.BindPFlag("verbosity", rootCmd.PersistentFlags().Lookup("verbosity"))
+
+	// Viper defaults
+	viper.SetDefault("namespaceSelector", map[string]string{"sentinel.io/controlled": "enabled"})
+	viper.SetDefault("metricsPort", "9090") // Default port for Prometheus metrics endpoint
+	viper.SetDefault("verbosity", 0)
+	viper.SetDefault("extraLabels", []sentinelShared.ExtraLabel{}) // Empty by default
+
+	// Start the sentinel command
+	rootCmd.AddCommand(startSentinel)
+}
+
+/*
+	Sentinel Config
+
+Here is where we initialize the Sentinel configuration.
+This configuration is used to set up the controller, metrics, and other parameters.
+- Ideally, all Sentinel parameters should have an equivalent here so that humans can override as they want.
+*/
+func initConfig() {
+	viper.SetConfigName("sentinel") // Name of config file without extension
+	viper.SetConfigType("yaml")
+	viper.AddConfigPath("/etc/sentinel") // Config file expected location
+
+	/*
+		Viper will read environment variables and use them as configuration values if they match your config keys.
+		EXAMPLE:
+		export METRICSPORT=12345 --> Viper will use the value from the environment variable instead of the default or config file.
+	*/
+	viper.AutomaticEnv()
+
+	if err := viper.ReadInConfig(); err == nil {
+		slog.Info("Config file loaded", "file", viper.ConfigFileUsed())
+	} else {
+		slog.Warn("No config file found, using environment variables and defaults", "err", err)
+	}
+
+	// Load into config struct
+	if err := viper.Unmarshal(&config); err != nil {
+		slog.Error("Unable to decode config into struct", "err", err)
+	}
+
+	// Apply fallback defaults if any field is missing
+	//shared.ApplyDefaultConfig(&config)
+}