uncloud CLI tool and 'machine add' command to bootstrap a new cluster

cmd/uncloud/main.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"github.com/spf13/cobra"
+	"os"
+	"strings"
+	"uncloud/cmd/uncloud/machine"
+	"uncloud/internal/cli"
+)
+
+func main() {
+	var configPath string
+	cmd := &cobra.Command{
+		Use:           "uncloud",
+		Short:         "A CLI tool for managing Uncloud resources such as clusters, machines, and services.",
+		SilenceUsage:  true,
+		SilenceErrors: true,
+		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
+			if strings.HasPrefix(configPath, "~/") {
+				home, err := os.UserHomeDir()
+				if err != nil {
+					return fmt.Errorf("get user home directory to resolve %q: %w", configPath, err)
+				}
+				configPath = strings.Replace(configPath, "~", home, 1)
+			}
+
+			uncli, err := cli.New(configPath)
+			if err != nil {
+				return fmt.Errorf("initialize CLI: %w", err)
+			}
+			cmd.SetContext(context.WithValue(cmd.Context(), "cli", uncli))
+			return nil
+		},
+	}
+	// TODO: allow to override using UNCLOUD_CONFIG env var.
+	cmd.PersistentFlags().StringVar(&configPath, "uncloud-config", "~/.config/uncloud/config.toml",
+		"path to the Uncloud configuration file")
+	_ = cmd.MarkPersistentFlagFilename("uncloud-config", "toml")
+
+	cmd.AddCommand(
+		machine.NewRootCommand(),
+	)
+	cobra.CheckErr(cmd.Execute())
+}