FUSE: Implement rclone integration

[efimsky]

Parent Issue

Part of #118 (FUSE-based Archive & Remote Browsing Feature)

Summary

Add rclone support for browsing FTP, S3, GCS, Azure, Dropbox and 40+ other cloud providers.

Dependencies

Requires #122 (SFTP remote connections)

Tasks

MountManager

• Implement list_rclone_remotes() -> list[str]

  • Run rclone listremotes
  • Parse output (one remote per line, with trailing colon)
  • Return list of remote names

• Implement mount_rclone(remote_spec: str) -> Path | None

  • Parse remote spec (e.g., "myremote:", "myremote:bucket/path")
  • Generate mount point using hash
  • Execute rclone mount remote_spec /mount/point --daemon
  • Wait briefly for mount to establish
  • Track in active_mounts with mount_type='rclone'
  • Return mount point or None on failure

• Implement setup_rclone_remote(name: str, type: str, config: dict) -> bool

  • Create new rclone remote via rclone config create
  • Return success boolean

• Implement can_mount_rclone() -> bool

  • Return self.tools.rclone

Menu Integration

• Add new Action enum values:

  RCLONE_REMOTES = auto()
  RCLONE_S3 = auto()
  RCLONE_GCS = auto()
  RCLONE_AZURE = auto()
  RCLONE_FTP = auto()

• Expand Connect menu:

  Menu('Connect', [
      MenuItem('SFTP...', 'connect_sftp'),
      MenuItem('─────────────', '', enabled=False),  # Separator
      MenuItem('Saved remotes...', 'rclone_remotes'),
      MenuItem('New S3...', 'rclone_s3'),
      MenuItem('New GCS...', 'rclone_gcs'),
      MenuItem('New Azure...', 'rclone_azure'),
      MenuItem('New FTP...', 'rclone_ftp'),
      MenuItem('─────────────', '', enabled=False),  # Separator
      MenuItem('Unmount current', 'unmount'),  # For Phase 6
  ])

• Add action mappings to MENU_ACTION_MAP

App Methods

• Handle Action.RCLONE_REMOTES - show list of configured remotes

• Handle Action.RCLONE_S3 - prompt for S3 credentials

• Handle Action.RCLONE_GCS - prompt for GCS credentials

• Handle Action.RCLONE_AZURE - prompt for Azure credentials

• Handle Action.RCLONE_FTP - prompt for FTP host/credentials

• Implement App._show_rclone_remotes():

  • Get list from mount_manager.list_rclone_remotes()
  • Show selection dialog
  • Mount selected remote
  • Navigate to mount point

• Implement App._prompt_rclone_setup(type: str):

  • Show guided prompts for remote type
  • Collect required credentials
  • Call mount_manager.setup_rclone_remote()

Dynamic Menu State

• Disable rclone menu items when rclone not available
• Show remote count in "Saved remotes..." item if remotes exist

Testing

• Test list_rclone_remotes() parses output correctly
• Test mount_rclone() calls rclone with correct arguments
• Test mount_rclone() tracks mount with mount_type='rclone'
• Test setup_rclone_remote() creates remote config
• Test rclone menu items exist in Connect menu
• Test menu items disabled when rclone unavailable

Files

• Modify: tnc/mount.py
• Modify: tnc/app.py
• Modify: tnc/menu.py
• Modify: tests/test_mount.py