feat(push): stub for 'image push' command and Dialer interface for cluster connectors

cmd/uncloud/image/push.go

@@ -0,0 +1,47 @@
+package image
+
+import (
+	"fmt"
+
+	"github.com/psviderski/uncloud/internal/cli"
+	"github.com/spf13/cobra"
+)
+
+type pushOptions struct {
+	machines []string
+}
+
+func NewPushCommand() *cobra.Command {
+	opts := pushOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "push IMAGE",
+		Short: "Upload a local Docker image to the cluster.",
+		Long: `Upload a local Docker image to the cluster transferring only the missing layers.
+The image is uploaded to the machine which CLI is connected to (default) or the specified machine(s).`,
+		Example: `  # Push image to the currently connected machine.
+  uc image push myapp:latest
+
+  # Push image to specific machine.
+  uc image push myapp:latest -m machine1
+
+  # Push image to multiple machines.
+  uc image push myapp:latest -m machine1,machine2,machine3`,
+		Args: cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			image := args[0]
+
+			machines := cli.ExpandCommaSeparatedValues(opts.machines)
+
+			// TODO: Implement image push logic
+			fmt.Printf("Would push image %q to machines: %v\n", image, machines)
+			return fmt.Errorf("image push not yet implemented")
+		},
+	}
+
+	cmd.Flags().StringSliceVarP(&opts.machines, "machine", "m", nil,
+		"Machine names to push the image to. Can be specified multiple times or as a comma-separated "+
+			"list of machine names. (default is connected machine)")
+
+	return cmd
+}

cmd/uncloud/image/root.go

@@ -0,0 +1,18 @@
+package image
+
+import (
+	"github.com/spf13/cobra"
+)
+
+func NewRootCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "image",
+		Short: "Manage Docker images in a cluster.",
+	}
+
+	cmd.AddCommand(
+		NewPushCommand(),
+	)
+
+	return cmd
+}