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tstest/tailmac: add headless mode for automated VM testing

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Add a --headless flag to the Host.app Run subcommand for running
macOS VMs without a GUI, enabling use from test frameworks.

Key changes:

  - HostCli.swift: When --headless is set, run the VM via VMController
    + RunLoop.main.run() instead of NSApplicationMain. Using the
    RunLoop (not dispatchMain) is required because VZ framework
    callbacks depend on RunLoop sources.

  - VMController.swift: Add headless parameter to createVirtualMachine
    that configures a single socket-based NIC (no NAT NIC). This
    matches the NIC configuration used when creating/saving VMs, so
    saved state restoration works correctly. A NIC count mismatch
    causes VZ to silently fail to execute guest code.

  - TailMacConfigHelper.swift: Clean up socket network device logging.

  - Config.swift: Move VM storage from ~/VM.bundle to
    ~/.cache/tailscale/vmtest/macos/.

  - TailMac.swift: Fix dispatchMain→RunLoop.main.run() in the create
    command (same VZ RunLoop requirement).

Updates #13038

Change-Id: Iea51c043aa92e8fc6257139b9f0e2e7677072fa2
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2026-04-10 13:22:24 -07:00
committed by Brad Fitzpatrick
parent 0e8ae9d60c
commit 674f866ecc
5 changed files with 36 additions and 10 deletions
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tstest/tailmac/Swift/Common/Config.swift
+3 -3
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@@ -103,10 +103,10 @@ class Config: Codable {
}
// The VM Bundle URL holds the restore image and a set of VM images
// By default, VM's are persisted at ~/VM.bundle
// The VM Bundle URL holds the restore image and a set of VM images.
// VMs are stored under ~/.cache/tailscale/vmtest/macos/.
var vmBundleURL: URL = {
let vmBundlePath = NSHomeDirectory() + "/VM.bundle/"
let vmBundlePath = NSHomeDirectory() + "/.cache/tailscale/vmtest/macos/"
createDir(vmBundlePath)
let bundleURL = URL(fileURLWithPath: vmBundlePath)
return bundleURL