From 70a8f589c664bd221f829623d6803eed6021dba5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Skytt=C3=A4?= <ville.skytta@iki.fi>
Date: Wed, 28 Dec 2022 23:12:58 +0200
Subject: [PATCH] Detect Docker also using /.dockerenv

---
 internal/common/common.go       | 4 ++++
 internal/common/common_linux.go | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/internal/common/common.go b/internal/common/common.go
index 9cb752b..323402d 100644
--- a/internal/common/common.go
+++ b/internal/common/common.go
@@ -364,6 +364,10 @@ func HostDev(combineWith ...string) string {
 	return GetEnv("HOST_DEV", "/dev", combineWith...)
 }
 
+func HostRoot(combineWith ...string) string {
+	return GetEnv("HOST_ROOT", "/", combineWith...)
+}
+
 // getSysctrlEnv sets LC_ALL=C in a list of env vars for use when running
 // sysctl commands (see DoSysctrl).
 func getSysctrlEnv(env []string) []string {
diff --git a/internal/common/common_linux.go b/internal/common/common_linux.go
index 3b4de8e..fa6373b 100644
--- a/internal/common/common_linux.go
+++ b/internal/common/common_linux.go
@@ -259,6 +259,11 @@ func VirtualizationWithContext(ctx context.Context) (string, string, error) {
 		}
 	}
 
+	if PathExists(HostRoot(".dockerenv")) {
+		system = "docker"
+		role = "guest"
+	}
+
 	// before returning for the first time, cache the system and role
 	cachedVirtOnce.Do(func() {
 		cachedVirtMutex.Lock()