golink: add a --config-dir flag to override the default

By default, the directory chosen by tsnet is based on the name of the binary.
Allow the operator to set it explicitly, to avoid confusing deployments.

Signed-off-by: M. J. Fromberger <[email protected]>

Author: creachadair

golink.go

@@ -62,6 +62,7 @@ var (
 	useHTTPS          = flag.Bool("https", true, "serve golink over HTTPS if enabled on tailnet")
 	snapshot          = flag.String("snapshot", "", "file path of snapshot file")
 	hostname          = flag.String("hostname", defaultHostname, "service name")
+	configDir         = flag.String("config-dir", "", `tsnet configuration directory ("" to use default)`)
 	resolveFromBackup = flag.String("resolve-from-backup", "", "resolve a link from snapshot file and exit")
 	allowUnknownUsers = flag.Bool("allow-unknown-users", false, "allow unknown users to save links")
 )
@@ -176,6 +177,7 @@ func Run() error {
 	// create tsNet server and wait for it to be ready & connected.
 	srv := &tsnet.Server{
 		ControlURL:   *controlURL,
+		Dir:          *configDir,
 		Hostname:     *hostname,
 		Logf:         func(format string, args ...any) {},
 		RunWebClient: true,