From cadd475940dd3b657a5fa60ffee981edb22ada66 Mon Sep 17 00:00:00 2001
From: Johanan Liebermann <jliebermann@microsoft.com>
Date: Mon, 11 Aug 2025 19:03:38 +0300
Subject: [PATCH] Add support for Flatcar Container Linux

Signed-off-by: Johanan Liebermann <jliebermann@microsoft.com>
---
 pkg/util/helpers_linux.go            |  2 ++
 pkg/util/helpers_linux_test.go       |  6 ++++++
 pkg/util/testdata/os-release-flatcar | 13 +++++++++++++
 3 files changed, 21 insertions(+)
 create mode 100644 pkg/util/testdata/os-release-flatcar

diff --git a/pkg/util/helpers_linux.go b/pkg/util/helpers_linux.go
index 425e1fa8b..6bd10b319 100644
--- a/pkg/util/helpers_linux.go
+++ b/pkg/util/helpers_linux.go
@@ -70,6 +70,8 @@ func getOSVersion(osReleasePath string) (string, error) {
 		return getDebianVersion(osReleaseMap), nil
 	case "azurelinux":
 		return getDebianVersion(osReleaseMap), nil
+	case "flatcar":
+		return getDebianVersion(osReleaseMap), nil
 	default:
 		return "", fmt.Errorf("Unsupported ID in /etc/os-release: %q", osReleaseMap["ID"])
 	}
diff --git a/pkg/util/helpers_linux_test.go b/pkg/util/helpers_linux_test.go
index 7eda0d961..78bd4660f 100644
--- a/pkg/util/helpers_linux_test.go
+++ b/pkg/util/helpers_linux_test.go
@@ -93,6 +93,12 @@ func TestGetOSVersionLinux(t *testing.T) {
 			expectedOSVersion: "azurelinux 3.0.20240328",
 			expectErr:         false,
 		},
+		{
+			name:              "flatcar",
+			fakeOSReleasePath: "testdata/os-release-flatcar",
+			expectedOSVersion: "flatcar 4372.0.1",
+			expectErr:         false,
+		},
 		{
 			name:              "Unknown",
 			fakeOSReleasePath: "testdata/os-release-unknown",
diff --git a/pkg/util/testdata/os-release-flatcar b/pkg/util/testdata/os-release-flatcar
new file mode 100644
index 000000000..92c582aec
--- /dev/null
+++ b/pkg/util/testdata/os-release-flatcar
@@ -0,0 +1,13 @@
+NAME="Flatcar Container Linux by Kinvolk"
+ID=flatcar
+ID_LIKE=coreos
+VERSION=4372.0.1
+VERSION_ID=4372.0.1
+BUILD_ID=2025-07-06-2244
+SYSEXT_LEVEL=1.0
+PRETTY_NAME="Flatcar Container Linux by Kinvolk 4372.0.1 (Oklo)"
+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:flatcar-linux:flatcar_linux:4372.0.1:*:*:*:*:*:*:*"