From e865a0e2b04b9d9a4480bc5e4f4a2683c5e5c2cc Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@tailscale.com>
Date: Mon, 29 Jul 2024 19:23:26 -0700
Subject: [PATCH] cmd/tailscale/cli: add 'debug go-buildinfo' subcommand

To dump runtime/debug.BuildInfo.

Updates #1866

Change-Id: I8810390858a03b7649f9b22ef3ab910d423388da
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
---
 cmd/tailscale/cli/debug.go | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/cmd/tailscale/cli/debug.go b/cmd/tailscale/cli/debug.go
index f40859006..e98a9e078 100644
--- a/cmd/tailscale/cli/debug.go
+++ b/cmd/tailscale/cli/debug.go
@@ -22,6 +22,7 @@ import (
 	"os"
 	"os/exec"
 	"runtime"
+	"runtime/debug"
 	"strconv"
 	"strings"
 	"time"
@@ -330,9 +331,25 @@ var debugCmd = &ffcli.Command{
 				return fs
 			})(),
 		},
+		{
+			Name:       "go-buildinfo",
+			ShortUsage: "tailscale debug go-buildinfo",
+			ShortHelp:  "Prints Go's runtime/debug.BuildInfo",
+			Exec:       runGoBuildInfo,
+		},
 	},
 }
 
+func runGoBuildInfo(ctx context.Context, args []string) error {
+	bi, ok := debug.ReadBuildInfo()
+	if !ok {
+		return errors.New("no Go build info")
+	}
+	e := json.NewEncoder(os.Stdout)
+	e.SetIndent("", "\t")
+	return e.Encode(bi)
+}
+
 var debugArgs struct {
 	file    string
 	cpuSec  int