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cmd/tailscaled: add debug flag to print interfaces just once 

It previously only had a polling monitor mode.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-08-26 11:59:52 -07:00
parent b49d9bc74d
commit 4aab083cae
1 changed files with 13 additions and 3 deletions
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16
cmd/tailscaled/debug.go
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@ -35,6 +35,7 @@ import (
)
var debugArgs struct {
ifconfig bool // print network state once and exit
monitor bool
getURL string
derpCheck string
@ -45,6 +46,7 @@ var debugModeFunc = debugMode // so it can be addressable
func debugMode(args []string) error {
fs := flag.NewFlagSet("debug", flag.ExitOnError)
fs.BoolVar(&debugArgs.ifconfig, "ifconfig", false, "If true, print network interface state")
fs.BoolVar(&debugArgs.monitor, "monitor", false, "If true, run link monitor forever. Precludes all other options.")
fs.BoolVar(&debugArgs.portmap, "portmap", false, "If true, run portmap debugging. Precludes all other options.")
fs.StringVar(&debugArgs.getURL, "get-url", "", "If non-empty, fetch provided URL.")
@ -59,8 +61,11 @@ func debugMode(args []string) error {
if debugArgs.derpCheck != "" {
return checkDerp(ctx, debugArgs.derpCheck)
}
if debugArgs.ifconfig {
return runMonitor(ctx, false)
}
if debugArgs.monitor {
return runMonitor(ctx)
return runMonitor(ctx, true)
}
if debugArgs.portmap {
return debugPortmap(ctx)
@ -71,7 +76,7 @@ func debugMode(args []string) error {
return errors.New("only --monitor is available at the moment")
}
func runMonitor(ctx context.Context) error {
func runMonitor(ctx context.Context, loop bool) error {
dump := func(st *interfaces.State) {
j, _ := json.MarshalIndent(st, "", " ")
os.Stderr.Write(j)
@ -88,8 +93,13 @@ func runMonitor(ctx context.Context) error {
log.Printf("Link monitor fired. New state:")
dump(st)
})
log.Printf("Starting link change monitor; initial state:")
if loop {
log.Printf("Starting link change monitor; initial state:")
}
dump(mon.InterfaceState())
if !loop {
return nil
}
mon.Start()
log.Printf("Started link change monitor; waiting...")
select {}