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cmd/tailscale,net/netcheck: add debug feature to force preferred DERP

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This provides an interface for a user to force a preferred DERP outcome
for all future netchecks that will take precedence unless the forced
region is unreachable.

The option does not persist and will be lost when the daemon restarts.

Updates tailscale/corp#18997
Updates tailscale/corp#24755

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker
2024-12-04 12:02:59 -08:00
committed by James Tucker
parent 74069774be
commit 7f9ebc0a83
7 changed files with 140 additions and 1 deletions
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6
ipn/ipnlocal/local.go
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@@ -2920,6 +2920,12 @@ func (b *LocalBackend) DebugPickNewDERP() error {
return b.sys.MagicSock.Get().DebugPickNewDERP()
}
// DebugForcePreferDERP forwards to netcheck.DebugForcePreferDERP.
// See its docs.
func (b *LocalBackend) DebugForcePreferDERP(n int) {
b.sys.MagicSock.Get().DebugForcePreferDERP(n)
}
// send delivers n to the connected frontend and any API watchers from
// LocalBackend.WatchNotifications (via the LocalAPI).
//