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Alex Chan 7953592f40 tstest/integration: get TestOneNodeUpAuth to pass when offline ... How TestOneNodeUpAuth works: * it starts a test version of tailscaled * it runs `tailscale up` * it checks that tailscaled becomes "Running" However, if the network is down, the test either fails or times out, because tailscaled never becomes Running. ## Why does the test fail? ipn only becomes Running when it sees at least one live peer or DERP connection: 0cc1b2ff76/ipn/ipnlocal/local.go (L5861-L5866) The test only uses a single node, so it's never going to see a peer -- it has to wait to see a DERP server. The test environment does have a DERP map of in-memory DERP nodes, but we aren't connecting to them. magicsock sets the preferred DERP server in `updateNetInfo()`, but this function returns early if the network is down. 0cc1b2ff76/wgengine/magicsock/magicsock.go (L1053-L1106) Because we're checking the real network, this prevents ipn from entering "Running" and causes the test to fail. ## What's the fix? In tests, we can assume the network is up unless we're explicitly testing the behaviour of tailscaled when the network is down. We do something similar in magicsock/derp.go, where we assume we're connected to control unless explicitly testing otherwise: 7d2101f352/wgengine/magicsock/derp.go (L166-L177) This is the template for the changes to `networkDown()`. Additionally, the `testenv.InTest()` function currently checks for the `-test.v` flag, but this isn't visible to the version of tailscaled running in the test environment. Instead, we add a new `TEST` env var so this process knows it's inside a test. Fixes #17122 Signed-off-by: Alex Chan <alexc@tailscale.com>		3 months ago
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blockforever_conn.go	wgengine/magicsock: improve don't fragment bit set/get support	2 years ago
cloudinfo.go	wgengine/magicsock: use cloud metadata to get public IPs	1 year ago
cloudinfo_nocloud.go	wgengine/magicsock: use cloud metadata to get public IPs	1 year ago
cloudinfo_test.go	wgengine/magicsock: use cloud metadata to get public IPs	1 year ago
debughttp.go	net/{batching,packet},wgengine/magicsock: export batchingConn (#16848)	4 months ago
debugknobs.go	wgengine/magicsock: add TS_DEBUG_NEVER_DIRECT_UDP debug knob (#17094)	3 months ago
debugknobs_stubs.go	wgengine/magicsock: add TS_DEBUG_NEVER_DIRECT_UDP debug knob (#17094)	3 months ago
derp.go	wgengine/magicsock: drop DERP queue from head rather than tail	3 months ago
derp_test.go	net/netcheck,wgengine/magicsock: align DERP frame receive time heuristics	2 years ago
discopingpurpose_string.go	wgengine/magicsock: implement probing of UDP path lifetime (#10844)	2 years ago
endpoint.go	wgengine/magicsock: add TS_DEBUG_NEVER_DIRECT_UDP debug knob (#17094)	3 months ago
endpoint_default.go	all: adjust some build tags for plan9	2 years ago
endpoint_stub.go	all: adjust some build tags for plan9	2 years ago
endpoint_test.go	net/{batching,packet},wgengine/magicsock: export batchingConn (#16848)	4 months ago
endpoint_tracker.go	wgengine/magicsock: only cache N most recent endpoints per-Addr	2 years ago
endpoint_tracker_test.go	all: use Go 1.22 range-over-int	2 years ago
magicsock.go	tstest/integration: get TestOneNodeUpAuth to pass when offline	3 months ago
magicsock_default.go	net/sockopts,wgengine/magicsock: export socket buffer sizing logic (#16909)	4 months ago
magicsock_linux.go	net/sockopts,wgengine/magicsock: export socket buffer sizing logic (#16909)	4 months ago
magicsock_linux_test.go	wgengine/magicsock: fix bpf fragmentation jump offsets (#16204)	6 months ago
magicsock_notplan9.go	wgengine/magicsock: refactor maybeRebindOnError	11 months ago
magicsock_plan9.go	wgengine/magicsock: refactor maybeRebindOnError	11 months ago
magicsock_test.go	tstest/integration: get TestOneNodeUpAuth to pass when offline	3 months ago
peermap.go	net/{batching,packet},wgengine/magicsock: export batchingConn (#16848)	4 months ago
peermap_test.go	net/{batching,packet},wgengine/magicsock: export batchingConn (#16848)	4 months ago
peermtu.go	magicsock: mute noisy expected peer mtu related error (#10870)	2 years ago
peermtu_darwin.go	wgengine/magicsock: improve don't fragment bit set/get support	2 years ago
peermtu_linux.go	wgengine/magicsock: improve don't fragment bit set/get support	2 years ago
peermtu_stubs.go	magicsock: mute noisy expected peer mtu related error (#10870)	2 years ago
peermtu_unix.go	wgengine/magicsock: replace CanPMTUD() with ShouldPMTUD()	2 years ago
rebinding_conn.go	net/{batching,packet},wgengine/magicsock: export batchingConn (#16848)	4 months ago
relaymanager.go	wgengine/magicsock: add relayManager event logs (#17091)	3 months ago
relaymanager_test.go	wgengine/magicsock,all: allocate peer relay over disco instead of PeerAPI (#16603)	5 months ago