init ucind CLI commands

cmd/ucind/main.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"github.com/docker/docker/client"
+	"github.com/spf13/cobra"
+	"uncloud/cmd/ucind/cluster"
+	"uncloud/internal/ucind"
+)
+
+func main() {
+	cmd := &cobra.Command{
+		Use:   "ucind",
+		Short: "A CLI tool for running Uncloud test clusters using Docker.",
+		Long: "A CLI tool for running Uncloud test clusters using Docker.\n" +
+			"Machines in a ucind cluster are Docker containers running a ucind image. All machines within a cluster " +
+			"are connected to the same Docker network.",
+		SilenceUsage:  true,
+		SilenceErrors: true,
+		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
+			cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
+			if err != nil {
+				return fmt.Errorf("create Docker client: %w", err)
+			}
+
+			p := ucind.NewProvisioner(cli)
+			// Persist the provisioner in the context so it can be used by subcommands.
+			cmd.SetContext(context.WithValue(cmd.Context(), "provisioner", p))
+			return nil
+		},
+	}
+
+	cmd.AddCommand(
+		cluster.NewRootCommand(),
+	)
+	cobra.CheckErr(cmd.Execute())
+}