move Docker manager to docker package

internal/machine/docker/manager.go

@@ -0,0 +1,55 @@
+package docker
+
+import (
+	"context"
+	"fmt"
+	"github.com/docker/docker/client"
+	"log/slog"
+	"time"
+	"uncloud/internal/machine/store"
+)
+
+const (
+	NetworkName = "uncloud"
+	UserChain   = "DOCKER-USER"
+)
+
+type Manager struct {
+	client *client.Client
+	store  *store.Store
+}
+
+func NewManager(client *client.Client, store *store.Store) *Manager {
+	return &Manager{
+		client: client,
+		store:  store,
+	}
+}
+
+// WaitDaemonReady waits for the Docker daemon to start and be ready to serve requests.
+func (d *Manager) WaitDaemonReady(ctx context.Context) error {
+	ticker := time.NewTicker(1 * time.Second)
+	defer ticker.Stop()
+
+	ready, waitingLogged := false, false
+	for !ready {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		case <-ticker.C:
+			_, err := d.client.Ping(ctx)
+			if err == nil {
+				ready = true
+				break
+			}
+			if !client.IsErrConnectionFailed(err) {
+				return fmt.Errorf("connect to Docker daemon: %w", err)
+			}
+			if !waitingLogged {
+				slog.Info("Waiting for Docker daemon to start and be ready.")
+				waitingLogged = true
+			}
+		}
+	}
+	return nil
+}