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Avery Pennarun 6d10655dc3 ipnlocal: accept a new opts.UpdatePrefs field. ... This is needed because the original opts.Prefs field was at some point subverted for use in frontend->backend state migration for backward compatibility on some platforms. We still need that feature, but we also need the feature of providing the full set of prefs from `tailscale up`, *not* including overwriting the prefs.Persist keys, so we can't use the original field from `tailscale up`. `tailscale up` had attempted to compensate for that by doing SetPrefs() before Start(), but that violates the ipn.Backend contract, which says you should call Start() before anything else (that's why it's called Start()). As a result, doing SetPrefs({ControlURL=..., WantRunning=true}) would cause a connection to the *previous* control server (because WantRunning=true), and then connect to the *new* control server only after running Start(). This problem may have been avoided before, but only by pure luck. It turned out to be relatively harmless since the connection to the old control server was immediately closed and replaced anyway, but it created a race condition that could have caused spurious notifications or rejected keys if the server responded quickly. As already covered by existing TODOs, a better fix would be to have Start() get out of the business of state migration altogether. But we're approaching a release so I want to make the minimum possible fix. Fixes #1840. Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>		3 years ago
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ipnlocal	ipnlocal: accept a new opts.UpdatePrefs field.	3 years ago
ipnserver	cmd/tailscaled: don't block ipnserver startup behind engine init on Windows	3 years ago
ipnstate	ipn/ipnlocal, etc: require file sharing capability to send/recv files	4 years ago
localapi	ipn/ipnlocal, etc: require file sharing capability to send/recv files	4 years ago
policy	ipn/policy: mark peerapi4 and peerapi6 as interesting services	4 years ago
backend.go	ipnlocal: accept a new opts.UpdatePrefs field.	3 years ago
doc.go	Move Linux client & common packages into a public repo.	5 years ago
fake_test.go	ipn{,/ipnlocal}, cmd/tailscale/cli: don't check pref reverts on initial up	4 years ago
handle.go	ipn{,/ipnlocal}, cmd/tailscale/cli: don't check pref reverts on initial up	4 years ago
message.go	ipn: define NewBackendServer nil as not affecting Backend's NotifyCallback	3 years ago
message_test.go	ipn: define NewBackendServer nil as not affecting Backend's NotifyCallback	3 years ago
prefs.go	ipnlocal: accept a new opts.UpdatePrefs field.	3 years ago
prefs_clone.go	Add prefs.LoggedOut to fix several state machine bugs.	3 years ago
prefs_test.go	Add prefs.LoggedOut to fix several state machine bugs.	3 years ago
store.go	wgkey: new package	4 years ago
store_test.go	Add tstest.PanicOnLog(), and fix various problems detected by this.	4 years ago