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d47c697748
If you run tailscaled without passing a `--statedir`, Tailnet Lock is
unavailable -- we don't have a folder to store the AUMs in.
This causes a lot of unnecessary requests to bootstrap TKA, because
every time the node receives a NetMap with some TKA state, it tries to
bootstrap, fetches the bootstrap TKA state from the control plane, then
fails with the error:
TKA sync error: bootstrap: network-lock is not supported in this
configuration, try setting --statedir
We can't prevent the error, but we can skip the control plane request
that immediately gets dropped on the floor.
In local testing, a new node joining a tailnet caused *three* control
plane requests which were unused.
Updates tailscale/corp#19441
Signed-off-by: Alex Chan <alexc@tailscale.com>