add support for Azure Container Linux

Signed-off-by: Mayank Singh <mayansingh@microsoft.com>

Author: Mayank Singh

pkg/util/helpers_linux.go

@@ -72,6 +72,8 @@ func getOSVersion(osReleasePath string) (string, error) {
 		return getDebianVersion(osReleaseMap), nil
 	case "flatcar":
 		return getDebianVersion(osReleaseMap), nil
+	case "acl":
+		return getDebianVersion(osReleaseMap), nil
 	default:
 		return "", fmt.Errorf("unsupported ID in /etc/os-release: %q", osReleaseMap["ID"])
 	}

pkg/util/helpers_linux_test.go

@@ -100,6 +100,12 @@ func TestGetOSVersionLinux(t *testing.T) {
 			expectedOSVersion: "flatcar 4372.0.1",
 			expectErr:         false,
 		},
+		{
+			name:              "acl",
+			fakeOSReleasePath: "testdata/os-release-acl",
+			expectedOSVersion: "acl 4459.2.2",
+			expectErr:         false,
+		},
 		{
 			name:              "Unknown",
 			fakeOSReleasePath: "testdata/os-release-unknown",

pkg/util/testdata/os-release-acl

@@ -0,0 +1,13 @@
+NAME="Azure Container Linux"
+ID=acl
+ID_LIKE=flatcar
+VERSION=4459.2.2
+VERSION_ID=4459.2.2
+BUILD_ID=97-g545e29b39d
+SYSEXT_LEVEL=1.0
+PRETTY_NAME="Azure Container Linux 4459.2.2+97-g545e29b39d (ACL)"
+ANSI_COLOR="38;5;75"
+HOME_URL="https://flatcar.org/"
+BUG_REPORT_URL="https://issues.flatcar.org"
+FLATCAR_BOARD="amd64-usr"
+CPE_NAME="cpe:2.3:o:acl-linux:acl_linux:4459.2.2+97-g545e29b39d:*:*:*:*:*:*:*"