From 0be777c0eb93dcbc7486e12bceeb51ceeb3a2cd0 Mon Sep 17 00:00:00 2001
From: Xiao Ma <xiaom@google.com>
Date: Wed, 22 Jun 2022 19:04:54 +0900
Subject: DeviceInfoUtils: add isKernelVersionAtLeast method.

Add a method to check if the current kernel version is at least from a
given version.

Bug: 236783925
Test: atest com.android.testutils.DeviceInfoUtilsTest --iterations
Change-Id: If0509b8ccad895c31d9447fee06789540002f666
---
 .../src/com/android/testutils/DeviceInfoUtilsTest.java    | 14 ++++++++++++++
 .../com/android/testutils/DeviceInfoUtils.java            | 15 +++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/common/tests/unit/src/com/android/testutils/DeviceInfoUtilsTest.java b/common/tests/unit/src/com/android/testutils/DeviceInfoUtilsTest.java
index 6f603d50..e46dd599 100644
--- a/common/tests/unit/src/com/android/testutils/DeviceInfoUtilsTest.java
+++ b/common/tests/unit/src/com/android/testutils/DeviceInfoUtilsTest.java
@@ -106,4 +106,18 @@ public final class DeviceInfoUtilsTest {
         assertFalse(v1.isAtLeast(v4));
         assertFalse(v1.isAtLeast(v5));
     }
+
+    @Test
+    public void testKernelVersionIsAtLeast() {
+        // Pick a lower kernel version 4.0 which was released at April 2015, the kernel
+        // version running on all test devices nowadays should be higher than it.
+        assertTrue(DeviceInfoUtils.isKernelVersionAtLeast("4.0"));
+
+        // Invalid kernel version.
+        assertTrue(DeviceInfoUtils.isKernelVersionAtLeast("0.0.0"));
+
+        // Pick a higher kernel version which isn't released yet, comparison should return false.
+        // Need to update the target version in the future to make sure the test still passes.
+        assertFalse(DeviceInfoUtils.isKernelVersionAtLeast("20.0.0"));
+    }
 }
diff --git a/common/testutils/devicetests/com/android/testutils/DeviceInfoUtils.java b/common/testutils/devicetests/com/android/testutils/DeviceInfoUtils.java
index 1925b559..ea89edaa 100644
--- a/common/testutils/devicetests/com/android/testutils/DeviceInfoUtils.java
+++ b/common/testutils/devicetests/com/android/testutils/DeviceInfoUtils.java
@@ -16,6 +16,7 @@
 
 package com.android.testutils;
 
+import android.os.VintfRuntimeInfo;
 import android.text.TextUtils;
 import android.util.Pair;
 
@@ -157,4 +158,18 @@ public class DeviceInfoUtils {
             return new KVersion(0, 0, 0);
         }
     }
+
+    /**
+     * Check if the current kernel version is at least satisfied with the given version.
+     *
+     * @param  version the start version to compare
+     * @return return true if the current version is at least satisfied with the given version.
+     *         otherwise, return false.
+     */
+    public static boolean isKernelVersionAtLeast(final String version) {
+        final String kernelVersion = VintfRuntimeInfo.getKernelVersion();
+        final KVersion current = DeviceInfoUtils.getMajorMinorSubminorVersion(kernelVersion);
+        final KVersion from = DeviceInfoUtils.getMajorMinorSubminorVersion(version);
+        return current.isAtLeast(from);
+    }
 }
-- 
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