[host] linux: detect docker and rkt correctly

host/host_linux.go

@@ -359,7 +359,7 @@ func Virtualization() (string, string, error) {
 		if common.PathExists(filename + "/capabilities") {
 			contents, err := common.ReadLines(filename + "/capabilities")
 			if err == nil {
-				if common.StringsHas(contents, "control_d") {
+				if common.StringsContains(contents, "control_d") {
 					role = "host"
 				}
 			}
@@ -387,9 +387,9 @@ func Virtualization() (string, string, error) {
 	if common.PathExists(filename) {
 		contents, err := common.ReadLines(filename)
 		if err == nil {
-			if common.StringsHas(contents, "QEMU Virtual CPU") ||
-				common.StringsHas(contents, "Common KVM processor") ||
-				common.StringsHas(contents, "Common 32-bit KVM processor") {
+			if common.StringsContains(contents, "QEMU Virtual CPU") ||
+				common.StringsContains(contents, "Common KVM processor") ||
+				common.StringsContains(contents, "Common 32-bit KVM processor") {
 				system = "kvm"
 				role = "guest"
 			}
@@ -410,8 +410,8 @@ func Virtualization() (string, string, error) {
 		contents, err := common.ReadLines(filename + "/self/status")
 		if err == nil {
 
-			if common.StringsHas(contents, "s_context:") ||
-				common.StringsHas(contents, "VxID:") {
+			if common.StringsContains(contents, "s_context:") ||
+				common.StringsContains(contents, "VxID:") {
 				system = "linux-vserver"
 			}
 			// TODO: guest or host
@@ -421,11 +421,16 @@ func Virtualization() (string, string, error) {
 	if common.PathExists(filename + "/self/cgroup") {
 		contents, err := common.ReadLines(filename + "/self/cgroup")
 		if err == nil {
-			if common.StringsHas(contents, "lxc") ||
-				common.StringsHas(contents, "docker") {
+			if common.StringsContains(contents, "lxc") {
 				system = "lxc"
 				role = "guest"
-			} else if common.PathExists("/usr/bin/lxc-version") { // TODO: which
+			} else if common.StringsContains(contents, "docker") {
+				system = "docker"
+				role = "guest"
+			} else if common.StringsContains(contents, "machine-rkt") {
+				system = "rkt"
+				role = "guest"
+			} else if common.PathExists("/usr/bin/lxc-version") {
 				system = "lxc"
 				role = "host"
 			}