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Brad Fitzpatrick 49808ae6ea ipn{,/ipnlocal}, cmd/tailscale/cli: don't check pref reverts on initial up ... The ipn.NewPrefs func returns a populated ipn.Prefs for historical reasons. It's not used or as important as it once was, but it hasn't yet been removed. Meanwhile, it contains some default values that are used on some platforms. Notably, for this bug (#1725), Windows/Mac use its Prefs.RouteAll true value (to accept subnets), but Linux users have always gotten a "false" value for that, because that's what cmd/tailscale's CLI default flag is _for all operating systems_. That meant that "tailscale up" was rightfully reporting that the user was changing an implicit setting: RouteAll was changing from true with false with the user explicitly saying so. An obvious fix might be to change ipn.NewPrefs to return Prefs.RouteAll == false on some platforms, but the logic is complicated by darwin: we want RouteAll true on windows, android, ios, and the GUI mac app, but not the CLI tailscaled-on-macOS mode. But even if we used build tags (e.g. the "redo" build tag) to determine what the default is, that then means we have duplicated and differing "defaults" between both the CLI up flags and ipn.NewPrefs. Furthering that complication didn't seem like a good idea. So, changing the NewPrefs defaults is too invasive at this stage of the release, as is removing the NewPrefs func entirely. Instead, tweak slightly the semantics of the ipn.Prefs.ControlURL field. This now defines that a ControlURL of the empty string means both "we're uninitialized" and also "just use the default". Then, once we have the "empty-string-means-unintialized" semantics, use that to suppress "tailscale up"'s recent implicit-setting-revert checking safety net, if we've never initialized Tailscale yet. And update/add tests. Fixes #1725 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>		5 years ago
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ipnlocal	ipn{,/ipnlocal}, cmd/tailscale/cli: don't check pref reverts on initial up	5 years ago
ipnserver	ipn, paths, cmd/tailscaled: remove LegacyConfigPath, relaynode migration	5 years ago
ipnstate	ipn/ipnlocal, etc: require file sharing capability to send/recv files	5 years ago
localapi	ipn/ipnlocal, etc: require file sharing capability to send/recv files	5 years ago
policy	ipn/policy: mark peerapi4 and peerapi6 as interesting services	5 years ago
backend.go	ipn/ipnlocal: add LocalBackend.SetDirectFileRoot	5 years ago
doc.go	Move Linux client & common packages into a public repo.	6 years ago
fake_test.go	ipn{,/ipnlocal}, cmd/tailscale/cli: don't check pref reverts on initial up	5 years ago
handle.go	ipn{,/ipnlocal}, cmd/tailscale/cli: don't check pref reverts on initial up	5 years ago
message.go	ipn: set BackendServer's notify earlier; don't require Start	5 years ago
message_test.go	ipn: move Options.Notify to its own method	5 years ago
prefs.go	ipn{,/ipnlocal}, cmd/tailscale/cli: don't check pref reverts on initial up	5 years ago
prefs_clone.go	ipn/ipnlocal,wgengine/router,cmd/tailscale: add flag to allow local lan access when routing traffic via an exit node.	5 years ago
prefs_test.go	ipn/ipnlocal,wgengine/router,cmd/tailscale: add flag to allow local lan access when routing traffic via an exit node.	5 years ago
store.go	wgkey: new package	5 years ago
store_test.go	Add tstest.PanicOnLog(), and fix various problems detected by this.	6 years ago