Add NIC attachment hot-swap support to Host.app: VZNetworkDevice.attachment
is writable at runtime, so --disconnected-nic creates a NIC with no
attachment, and --attach-network hot-swaps it to a vnet dgram socket
after boot/restore. macOS detects link-up and does DHCP.
Refactor TailMacConfigHelper: extract createDgramAttachment() and
createDisconnectedNetworkDeviceConfiguration() from the monolithic
createSocketNetworkDeviceConfiguration().
Add --screenshot-port flag for headless mode. Host.app serves GET
/screenshot as JPEG via a localhost HTTP server, capturing the
VZVirtualMachineView via CGWindowListCreateImage. The Go test harness
polls these to push live thumbnails to the web dashboard.
Also: SIGINT handler in headless mode for clean VM state save.
Updates #13038
Change-Id: I42fba0ecd760371b4ec5b26a0557e3dd0ba9ecae
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Brad FitzpatrickandBrad Fitzpatrick
c0e6ffed0d