oeqa/kerneldevelopment: Able to apply a single patch to the Linux kernel source

Purpose of kernel development is basically to customize our
own recipes kernel by reused existing recipes.
 
This is an initiative of automating manual kernel development
test cases. Applying a single patch to the Linux kernel source
is one of the manual test cases of kernel development.

Objective of this test is as a developer we can make changes of
a file in kernel source and able to apply a single patch to
the kernel source.
 
ref:https://wiki.yoctoproject.org/wiki/Kernel_Development_Test_Cases

(From OE-Core rev: 00a5df641b94ef47eec36e742630db7b659102a4)

Signed-off-by: Mazliana <mazliana.mohamad@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 67 insertions, 0 deletions

diff --git a/meta/lib/oeqa/selftest/cases/kerneldevelopment.py b/meta/lib/oeqa/selftest/cases/kerneldevelopment.py
new file mode 100644
index 0000000000..a61876ee61
--- /dev/null
+++ b/meta/lib/oeqa/selftest/cases/kerneldevelopment.py
@@ -0,0 +1,67 @@
+import os
+from oeqa.selftest.case import OESelftestTestCase
+from oeqa.utils.commands import runCmd, get_bb_var
+from oeqa.utils.git import GitRepo
+
+class KernelDev(OESelftestTestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        super(KernelDev, cls).setUpClass()
+        # Create the recipe directory structure inside the created layer
+        cls.layername = 'meta-kerneltest'
+        runCmd('bitbake-layers create-layer %s' % cls.layername)
+        runCmd('mkdir -p %s/recipes-kernel/linux/linux-yocto' % cls.layername)
+        cls.recipes_linuxyocto_dir = os.path.join \
+            (cls.builddir, cls.layername, 'recipes-kernel', 'linux', 'linux-yocto')
+        cls.recipeskernel_dir = os.path.dirname(cls.recipes_linuxyocto_dir)
+        runCmd('bitbake-layers add-layer %s' % cls.layername)
+
+    @classmethod
+    def tearDownClass(cls):
+        runCmd('bitbake-layers remove-layer %s' % cls.layername, ignore_status=True)
+        runCmd('rm -rf %s' % cls.layername)
+        super(KernelDev, cls).tearDownClass()
+
+    def setUp(self):
+        super(KernelDev, self).setUp()
+        self.set_machine_config('MACHINE = "qemux86-64"\n')
+
+    def test_apply_patches(self):
+        """
+        Summary:     Able to apply a single patch to the Linux kernel source
+        Expected:    The README file should exist and the patch changes should be
+                     displayed at the end of the file.
+        Product:     Kernel Development
+        Author:      Yeoh Ee Peng <ee.peng.yeoh@intel.com>
+        AutomatedBy: Mazliana Mohamad <mazliana.mohamad@intel.com>
+        """
+        runCmd('bitbake virtual/kernel -c patch')
+        kernel_source = get_bb_var('STAGING_KERNEL_DIR')
+        readme = os.path.join(kernel_source, 'README')
+
+        # This test step adds modified file 'README' to git and creates a
+        # patch file '0001-KERNEL_DEV_TEST_CASE.patch' at the same location as file
+        patch_content = 'This is a test to apply a patch to the kernel'
+        with open(readme, 'a+') as f:
+            f.write(patch_content)
+        repo = GitRepo('%s' % kernel_source, is_topdir=True)
+        repo.run_cmd('add %s' % readme)
+        repo.run_cmd(['commit', '-m', 'KERNEL_DEV_TEST_CASE'])
+        repo.run_cmd(['format-patch', '-1'])
+        patch_name = '0001-KERNEL_DEV_TEST_CASE.patch'
+        patchpath = os.path.join(kernel_source, patch_name)
+        runCmd('mv %s %s' % (patchpath, self.recipes_linuxyocto_dir))
+        runCmd('rm %s ' % readme)
+        self.assertFalse(os.path.exists(readme))
+
+        recipe_append = os.path.join(self.recipeskernel_dir, 'linux-yocto_%.bbappend')
+        with open(recipe_append, 'w+') as fh:
+            fh.write('SRC_URI += "file://%s"\n' % patch_name)
+            fh.write('FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"')
+
+        runCmd('bitbake virtual/kernel -c clean')
+        runCmd('bitbake virtual/kernel -c patch')
+        self.assertTrue(os.path.exists(readme))
+        result = runCmd('tail -n 1 %s' % readme)
+        self.assertEqual(result.output, patch_content)