[OE-core] [PATCH v2] oeqa/kerneldevelopment: Able to apply a single patch to the Linux kernel source

[mazliana.mohamad at intel.com]

From: Mazliana <mazliana.mohamad at intel.com>

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

Signed-off-by: Mazliana <mazliana.mohamad at intel.com>
---
 meta/lib/oeqa/selftest/cases/kerneldevelopment.py | 66 +++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 meta/lib/oeqa/selftest/cases/kerneldevelopment.py

diff --git a/meta/lib/oeqa/selftest/cases/kerneldevelopment.py b/meta/lib/oeqa/selftest/cases/kerneldevelopment.py
new file mode 100644
index 0000000..cde1ba2
--- /dev/null
+++ b/meta/lib/oeqa/selftest/cases/kerneldevelopment.py
@@ -0,0 +1,66 @@
+import os
+from oeqa.selftest.case import OESelftestTestCase
+from oeqa.utils.commands import bitbake, runCmd, get_bb_var
+from oeqa.utils.git import GitRepo, GitError
+
+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 = "%s"\n' % 'qemux86-64')
+
+    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 at intel.com>
+        AutomatedBy: Mazliana Mohamad <mazliana.mohamad at 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'
+        runCmd('echo %s >> %s' % (patch_content, readme))
+        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 cleansstate')
+        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)
\ No newline at end of file
-- 
2.7.4