oeqa rtc.py: skip if read-only-rootfs

hwclock command fails on read-only-rootfs:

AssertionError: 1 != 0 : Failed to reset RTC time, output: hwclock: cannot open /etc/adjtime: Read-only file system

(From OE-Core rev: 017bf8c160f6ab67d9f8e8d9e30b15bf84f73807)

Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/runtime/cases/rtc.py

@@ -5,6 +5,7 @@
 #
 from oeqa.runtime.case import OERuntimeTestCase
 from oeqa.core.decorator.depends import OETestDepends
+from oeqa.core.decorator.data import skipIfFeature
 from oeqa.runtime.decorator.package import OEHasPackage
 
 import re
@@ -21,12 +22,14 @@ class RTCTest(OERuntimeTestCase):
             self.logger.debug('Starting systemd-timesyncd daemon')
             self.target.run('systemctl enable --now --runtime systemd-timesyncd')
 
+    @skipIfFeature('read-only-rootfs',
+                   'Test does not work with read-only-rootfs in IMAGE_FEATURES')
     @OETestDepends(['ssh.SSHTest.test_ssh'])
     @OEHasPackage(['coreutils', 'busybox'])
     def test_rtc(self):
         (status, output) = self.target.run('hwclock -r')
         self.assertEqual(status, 0, msg='Failed to get RTC time, output: %s' % output)
-        
+
         (status, current_datetime) = self.target.run('date +"%m%d%H%M%Y"')
         self.assertEqual(status, 0, msg='Failed to get system current date & time, output: %s' % current_datetime)
 
@@ -37,7 +40,6 @@ class RTCTest(OERuntimeTestCase):
 
         (status, output) = self.target.run('date %s' % current_datetime)
         self.assertEqual(status, 0, msg='Failed to reset system date & time, output: %s' % output)
-        
+
         (status, output) = self.target.run('hwclock -w')
         self.assertEqual(status, 0, msg='Failed to reset RTC time, output: %s' % output)
-