From 6990a314f52c59139d1b33075365175bd5961516 Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@tailscale.com>
Date: Sun, 22 Aug 2021 21:15:30 -0700
Subject: [PATCH] hostinfo: set DeviceModel from Linux devicetree model

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
---
 hostinfo/hostinfo_linux.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/hostinfo/hostinfo_linux.go b/hostinfo/hostinfo_linux.go
index 45b368780..cb8ee2aed 100644
--- a/hostinfo/hostinfo_linux.go
+++ b/hostinfo/hostinfo_linux.go
@@ -11,6 +11,7 @@ import (
 	"bytes"
 	"fmt"
 	"io/ioutil"
+	"os"
 	"strings"
 	"syscall"
 
@@ -20,6 +21,12 @@ import (
 
 func init() {
 	osVersion = osVersionLinux
+
+	if v, _ := os.ReadFile("/sys/firmware/devicetree/base/model"); len(v) > 0 {
+		// Look up "Raspberry Pi 4 Model B Rev 1.2",
+		// etc. Usually set on ARM SBCs.
+		SetDeviceModel(strings.Trim(string(v), "\x00\r\n\t "))
+	}
 }
 
 func osVersionLinux() string {