mirror of https://github.com/status-im/consul.git
test: fix TestAgent.Start() to not segfault if the DNSServer cannot ListenAndServe (#6409)
The embedded `Server` field on a `DNSServer` is only set inside of the `ListenAndServe` method. If that method fails for reasons like the address being in use and is not bindable, then the `Server` field will not be set and the overall `Agent.Start()` will fail. This will trigger the inner loop of `TestAgent.Start()` to invoke `ShutdownEndpoints` which will attempt to pretty print the DNS servers using fields on that inner `Server` field. Because it was never set, this causes a nil pointer dereference and crashes the test.
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@ -1654,8 +1654,10 @@ func (a *Agent) ShutdownEndpoints() {
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}
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for _, srv := range a.dnsServers {
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a.logger.Printf("[INFO] agent: Stopping DNS server %s (%s)", srv.Server.Addr, srv.Server.Net)
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srv.Shutdown()
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if srv.Server != nil {
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a.logger.Printf("[INFO] agent: Stopping DNS server %s (%s)", srv.Server.Addr, srv.Server.Net)
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srv.Shutdown()
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}
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}
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a.dnsServers = nil
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@ -165,7 +165,7 @@ func (a *TestAgent) Start(t *testing.T) *TestAgent {
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a.Agent = agent
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break
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} else if i == 0 {
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require.Fail("%s %s Error starting agent: %s", id, a.Name, err)
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require.Failf("%s %s Error starting agent: %s", id, a.Name, err)
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} else if a.ExpectConfigError {
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// Panic the error since this can be caught if needed. Pretty gross way to
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// detect errors but enough for now and this is a tiny edge case that I'd
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