From 4b71291cdbfa025a3e8fb978ee954a6d97777c93 Mon Sep 17 00:00:00 2001
From: Denton Gentry <dgentry@tailscale.com>
Date: Sun, 13 Jun 2021 07:31:52 -0700
Subject: [PATCH] hostinfo: detect when running in Azure App Service.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
---
 control/controlclient/hostinfo_linux.go | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/control/controlclient/hostinfo_linux.go b/control/controlclient/hostinfo_linux.go
index 187e0d36a..6a0c31dde 100644
--- a/control/controlclient/hostinfo_linux.go
+++ b/control/controlclient/hostinfo_linux.go
@@ -68,6 +68,9 @@ func osVersionLinux() string {
 	if inHerokuDyno() {
 		attrBuf.WriteString("; env=hr")
 	}
+	if inAzureAppService() {
+		attrBuf.WriteString("; env=az")
+	}
 	attr := attrBuf.String()
 
 	id := m["ID"]
@@ -138,6 +141,7 @@ func inAwsLambda() bool {
 	}
 	return false
 }
+
 func inHerokuDyno() bool {
 	// https://devcenter.heroku.com/articles/dynos#local-environment-variables
 	if os.Getenv("PORT") != "" && os.Getenv("DYNO") != "" {
@@ -145,3 +149,11 @@ func inHerokuDyno() bool {
 	}
 	return false
 }
+
+func inAzureAppService() bool {
+	if os.Getenv("APPSVC_RUN_ZIP") != "" && os.Getenv("WEBSITE_STACK") != "" &&
+		os.Getenv("WEBSITE_AUTH_AUTO_AAD") != "" {
+		return true
+	}
+	return false
+}