From dfa5e38fade0c6455435b05acda40da93102a8d9 Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@tailscale.com>
Date: Mon, 26 Jul 2021 14:53:42 -0700
Subject: [PATCH] control/controlclient: report whether we're in a snap package

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

diff --git a/control/controlclient/direct.go b/control/controlclient/direct.go
index 5037c25c9..595bfd23e 100644
--- a/control/controlclient/direct.go
+++ b/control/controlclient/direct.go
@@ -220,6 +220,13 @@ func packageType() string {
 		// Using tailscaled or IPNExtension?
 		exe, _ := os.Executable()
 		return filepath.Base(exe)
+	case "linux":
+		// Report whether this is in a snap.
+		// See https://snapcraft.io/docs/environment-variables
+		// We just look at two somewhat arbitrarily.
+		if os.Getenv("SNAP_NAME") != "" && os.Getenv("SNAP") != "" {
+			return "snap"
+		}
 	}
 	return ""
 }