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ipn/ipnlocal: add logging and locking to c2n /update (#9290)
Log some progress info to make updates more debuggable. Also, track whether an active update is already started and return an error if a concurrent update is attempted. Some planned future PRs: * add JSON output to `tailscale update` * use JSON output from `tailscale update` to provide a more detailed status of in-progress update (stage, download progress, etc) Updates #6907 Signed-off-by: Andrew Lytvynov <awly@tailscale.com>
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@@ -39,7 +39,7 @@ type C2NSSHUsernamesResponse struct {
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// its Tailscale installation.
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type C2NUpdateResponse struct {
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// Err is the error message, if any.
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Err string
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Err string `json:",omitempty"`
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// Enabled indicates whether the user has opted in to updates triggered from
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// control.
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