From b749548a9eb43b34cce64f8688107645411abc8c Mon Sep 17 00:00:00 2001
From: Eduardo Otubo <otubo@redhat.com>
Date: Tue, 18 Aug 2020 23:12:02 +0200
Subject: Detect kernel version before swap file creation (#428)

According to man page `man 8 swapon', "Preallocated swap files are
supported on XFS since Linux 4.18". This patch checks for kernel version
before attepting to create swapfile, using dd for XFS only on kernel
versions <= 4.18 or btrfs.

Add new func util.kernel_version which returns a tuple of ints (major, minor)

Signed-off-by: Eduardo Otubo otubo@redhat.com
---
 tests/unittests/test_util.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'tests/unittests/test_util.py')

diff --git a/tests/unittests/test_util.py b/tests/unittests/test_util.py
index aa5352e9..fc557469 100644
--- a/tests/unittests/test_util.py
+++ b/tests/unittests/test_util.py
@@ -968,6 +968,22 @@ class TestGetProcEnv(helpers.TestCase):
         self.assertEqual(my_ppid, util.get_proc_ppid(my_pid))
 
 
+class TestKernelVersion():
+    """test kernel version function"""
+
+    params = [
+        ('5.6.19-300.fc32.x86_64', (5, 6)),
+        ('4.15.0-101-generic', (4, 15)),
+        ('3.10.0-1062.12.1.vz7.131.10', (3, 10)),
+        ('4.18.0-144.el8.x86_64', (4, 18))]
+
+    @mock.patch('os.uname')
+    @pytest.mark.parametrize("uname_release,expected", params)
+    def test_kernel_version(self, m_uname, uname_release, expected):
+        m_uname.return_value.release = uname_release
+        assert expected == util.kernel_version()
+
+
 class TestFindDevs:
     @mock.patch('cloudinit.subp.subp')
     def test_find_devs_with(self, m_subp):
-- 
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