tests/os: Add kernel - dtb overlap test

If a kernel or dtb overlap or overwrite is detected in u-boot,
a file named overlap_detected is created in the boot partition.

In this test we check for the presence of this file.

Signed-off-by: Alexandru Costache <alexandru@balena.io>

tests/suites/os/suite.js

@@ -403,6 +403,7 @@ module.exports = {
 		'./tests/secureboot',
 		'./tests/device-specific-tests/beaglebone-black',
 		'./tests/device-specific-tests/243390-rpi3',
+		'./tests/overlap_test/',
 		'./tests/fingerprint',
 		'./tests/fsck',
 		'./tests/os-release',

tests/suites/os/tests/overlap_test/index.js

@@ -0,0 +1,21 @@
+module.exports = {
+	title: 'Kernel and device-tree overlap test',
+	run: async function(test) {
+		test.comment(`Checking if the kernel or the device-tree have been overwritten`);
+		let result = '';
+		result = await this.context
+			.get()
+			.worker.executeCommandInHostOS(
+				`if [ -e /mnt/boot/overlap_detected ]; then echo "Test failed"; else echo "OK"; fi;`,
+				this.link,
+			);
+
+		if (result.includes('OK')) {
+			test.comment(`not ok! - kernel - dtb overlap detected`);
+		} else {
+			test.comment(`ok - no overlap detected`);
+		}
+
+		test.is(result.includes('OK'), true, 'Kernel - dtb overlap check completed');
+	},
+};