On macOS, we link the CLI into the GUI executable so it can be included in
the Mac App Store build.
You then need to run it like:
/Applications/Tailscale.app/Contents/MacOS/Tailscale <command>
But our old detection of whether you're running that Tailscale binary
in CLI mode wasn't accurate and often bit people. For instance, when
they made a typo, it then launched in GUI mode and broke their
existing GUI connection (starting a new IPNExtension) and took down
their network.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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