[PULL,05/21] tests/functional: Add a base class for the TuxRun tests

diff --git a/tests/functional/qemu_test/tuxruntest.py b/tests/functional/qemu_test/tuxruntest.py
new file mode 100644
index 0000000000..904da6f609
--- /dev/null
+++ b/tests/functional/qemu_test/tuxruntest.py
@@ -0,0 +1,158 @@ 
+# Functional test that boots known good tuxboot images the same way
+# that tuxrun (www.tuxrun.org) does. This tool is used by things like
+# the LKFT project to run regression tests on kernels.
+#
+# Copyright (c) 2023 Linaro Ltd.
+#
+# Author:
+#  Alex Bennée <alex.bennee@linaro.org>
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+import os
+import time
+
+from qemu_test import QemuSystemTest
+from qemu_test import exec_command, exec_command_and_wait_for_pattern
+from qemu_test import wait_for_console_pattern
+from qemu_test import has_cmd, run_cmd, get_qemu_img
+
+class TuxRunBaselineTest(QemuSystemTest):
+
+    KERNEL_COMMON_COMMAND_LINE = 'printk.time=0'
+    # Tests are ~10-40s, allow for --debug/--enable-gcov overhead
+    timeout = 100
+
+    def get_tag(self, tagname, default=None):
+        """
+        Get the metadata tag or return the default.
+        """
+        utag = self._get_unique_tag_val(tagname)
+        print(f"{tagname}/{default} -> {utag}")
+        if utag:
+            return utag
+
+        return default
+
+    def setUp(self):
+        super().setUp()
+
+        # We need zstd for all the tuxrun tests
+        # See https://github.com/avocado-framework/avocado/issues/5609
+        (has_zstd, msg) = has_cmd('zstd')
+        if has_zstd is False:
+            self.skipTest(msg)
+        self.zstd = 'zstd'
+
+        # Pre-init TuxRun specific settings: Most machines work with
+        # reasonable defaults but we sometimes need to tweak the
+        # config. To avoid open coding everything we store all these
+        # details in the metadata for each test.
+
+        # The tuxboot tag matches the root directory
+        self.tuxboot = self.arch
+
+        # Most Linux's use ttyS0 for their serial port
+        self.console = "ttyS0"
+
+        # Does the machine shutdown QEMU nicely on "halt"
+        self.wait_for_shutdown = True
+
+        self.root = "vda"
+
+        # Occasionally we need extra devices to hook things up
+        self.extradev = None
+
+        self.qemu_img = get_qemu_img(self)
+
+    def wait_for_console_pattern(self, success_message, vm=None):
+        wait_for_console_pattern(self, success_message,
+                                 failure_message='Kernel panic - not syncing',
+                                 vm=vm)
+
+    def fetch_tuxrun_assets(self, kernel_asset, rootfs_asset, dtb_asset=None):
+        """
+        Fetch the TuxBoot assets.
+        """
+        kernel_image =  kernel_asset.fetch()
+        disk_image_zst = rootfs_asset.fetch()
+
+        run_cmd([self.zstd, "-f", "-d", disk_image_zst,
+                 "-o", self.workdir + "/rootfs.ext4"])
+
+        dtb = dtb_asset.fetch() if dtb_asset is not None else None
+
+        return (kernel_image, self.workdir + "/rootfs.ext4", dtb)
+
+    def prepare_run(self, kernel, disk, drive, dtb=None, console_index=0):
+        """
+        Setup to run and add the common parameters to the system
+        """
+        self.vm.set_console(console_index=console_index)
+
+        # all block devices are raw ext4's
+        blockdev = "driver=raw,file.driver=file," \
+            + f"file.filename={disk},node-name=hd0"
+
+        kcmd_line = self.KERNEL_COMMON_COMMAND_LINE
+        kcmd_line += f" root=/dev/{self.root}"
+        kcmd_line += f" console={self.console}"
+
+        self.vm.add_args('-kernel', kernel,
+                         '-append', kcmd_line,
+                         '-blockdev', blockdev)
+
+        # Sometimes we need extra devices attached
+        if self.extradev:
+            self.vm.add_args('-device', self.extradev)
+
+        self.vm.add_args('-device',
+                         f"{drive},drive=hd0")
+
+        # Some machines need an explicit DTB
+        if dtb:
+            self.vm.add_args('-dtb', dtb)
+
+    def run_tuxtest_tests(self, haltmsg):
+        """
+        Wait for the system to boot up, wait for the login prompt and
+        then do a few things on the console. Trigger a shutdown and
+        wait to exit cleanly.
+        """
+        self.wait_for_console_pattern("Welcome to TuxTest")
+        time.sleep(0.2)
+        exec_command(self, 'root')
+        time.sleep(0.2)
+        exec_command(self, 'cat /proc/interrupts')
+        time.sleep(0.1)
+        exec_command(self, 'cat /proc/self/maps')
+        time.sleep(0.1)
+        exec_command(self, 'uname -a')
+        time.sleep(0.1)
+        exec_command_and_wait_for_pattern(self, 'halt', haltmsg)
+
+        # Wait for VM to shut down gracefully if it can
+        if self.wait_for_shutdown:
+            self.vm.wait()
+        else:
+            self.vm.shutdown()
+
+    def common_tuxrun(self,
+                      kernel_asset,
+                      rootfs_asset,
+                      dtb_asset=None,
+                      drive="virtio-blk-device",
+                      haltmsg="reboot: System halted",
+                      console_index=0):
+        """
+        Common path for LKFT tests. Unless we need to do something
+        special with the command line we can process most things using
+        the tag metadata.
+        """
+        (kernel, disk, dtb) = self.fetch_tuxrun_assets(kernel_asset, rootfs_asset,
+                                                       dtb_asset)
+
+        self.prepare_run(kernel, disk, drive, dtb, console_index)
+        self.vm.launch()
+        self.run_tuxtest_tests(haltmsg)
+        os.remove(disk)