refactor(internal/client): use flags instead of env vars

internal/client/client.go

@@ -6,6 +6,7 @@ import (
 	"crypto/rand"
 	"encoding/base64"
 	"errors"
+	"flag"
 	"fmt"
 	"io"
 	"log/slog"
@@ -48,20 +49,6 @@ func (c Conf) SlogLevel() slog.Level {
 	}
 }
 
-func loadConfigFromSystem(sys system.System) Conf {
-	var c Conf
-
-	c.ConfigDir = sys.GetEnv("DSFXCTL_CONFIG_DIR")
-	if c.ConfigDir == "" {
-		c.ConfigDir = DefaultConfigDir
-	}
-
-	// defaults are handled by Conf.SlogLevel.
-	c.LogLevel = sys.GetEnv("DSFXCTL_LOG_LEVEL")
-
-	return c
-}
-
 // Client represents the client application for dsfxctl.
 type Client struct {
 	// resources
@@ -76,7 +63,16 @@ type Client struct {
 // New creates a new Client instance with the provided disk, system, and
 // configuration.
 func New(disk disk.Disk, system system.System) *Client {
-	conf := loadConfigFromSystem(system)
+	flagConfig := flag.String("configDir", "/etc/dsfxctl", "Path to the configuration directory")
+	flagLogLevel := flag.String("logLevel", "info", "The log level (debug, info, warn, error)")
+
+	if !flag.Parsed() {
+		flag.Parse()
+	}
+	conf := Conf{
+		LogLevel:  *flagLogLevel,
+		ConfigDir: *flagConfig,
+	}
 
 	return &Client{
 		// resources