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cmd/tailscale/cli: fix panic in netcheck print when no DERP home

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Fixes #8016

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2023-07-13 08:04:07 -07:00 committed by Brad Fitzpatrick
parent 9ee173c256
commit 668a0dd5ab
1 changed files with 5 additions and 1 deletions
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6
cmd/tailscale/cli/netcheck.go
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@ -153,7 +153,11 @@ func printReport(dm *tailcfg.DERPMap, report *netcheck.Report) error {
if len(report.RegionLatency) == 0 { if len(report.RegionLatency) == 0 {
printf("\t* Nearest DERP: unknown (no response to latency probes)\n") printf("\t* Nearest DERP: unknown (no response to latency probes)\n")
} else { } else {
printf("\t* Nearest DERP: %v\n", dm.Regions[report.PreferredDERP].RegionName) if report.PreferredDERP != 0 {
printf("\t* Nearest DERP: %v\n", dm.Regions[report.PreferredDERP].RegionName)
} else {
printf("\t* Nearest DERP: [none]\n")
}
printf("\t* DERP latency:\n") printf("\t* DERP latency:\n")
var rids []int var rids []int
for rid := range dm.Regions { for rid := range dm.Regions {