From 3ab587abe76aaab1e614b3341e860204bcb2b8bc Mon Sep 17 00:00:00 2001
From: Denton Gentry <dgentry@tailscale.com>
Date: Sat, 8 May 2021 07:40:45 -0700
Subject: [PATCH] hostinfo: detect Heroku Dyno.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
---
 control/controlclient/hostinfo_linux.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/control/controlclient/hostinfo_linux.go b/control/controlclient/hostinfo_linux.go
index 364e1098b..187e0d36a 100644
--- a/control/controlclient/hostinfo_linux.go
+++ b/control/controlclient/hostinfo_linux.go
@@ -65,6 +65,9 @@ func osVersionLinux() string {
 	if inAwsLambda() {
 		attrBuf.WriteString("; env=lm")
 	}
+	if inHerokuDyno() {
+		attrBuf.WriteString("; env=hr")
+	}
 	attr := attrBuf.String()
 
 	id := m["ID"]
@@ -135,3 +138,10 @@ func inAwsLambda() bool {
 	}
 	return false
 }
+func inHerokuDyno() bool {
+	// https://devcenter.heroku.com/articles/dynos#local-environment-variables
+	if os.Getenv("PORT") != "" && os.Getenv("DYNO") != "" {
+		return true
+	}
+	return false
+}