tests/functional: Convert the linux_initrd avocado test into a standalone test

While we're at it, update the SHA1 hashes to SHA256 hashes since
SHA1 should not be used anymore nowadays.

Message-ID: <20240830133841.142644-32-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/functional/test_linux_initrd.py

@@ -0,0 +1,96 @@
+#!/usr/bin/env python3
+#
+# Linux initrd integration test.
+#
+# Copyright (c) 2018 Red Hat, Inc.
+#
+# Author:
+#  Wainer dos Santos Moschetta <wainersm@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or
+# later.  See the COPYING file in the top-level directory.
+
+import os
+import logging
+import tempfile
+
+from qemu_test import QemuSystemTest, Asset
+from unittest import skipUnless
+
+
+class LinuxInitrd(QemuSystemTest):
+    """
+    Checks QEMU evaluates correctly the initrd file passed as -initrd option.
+    """
+
+    timeout = 300
+
+    ASSET_F18_KERNEL = Asset(
+        ('https://archives.fedoraproject.org/pub/archive/fedora/linux/'
+         'releases/18/Fedora/x86_64/os/images/pxeboot/vmlinuz'),
+        '1a27cb42559ce29237ac186699d063556ad69c8349d732bb1bd8d614e5a8cc2e')
+
+    ASSET_F28_KERNEL = Asset(
+        ('https://archives.fedoraproject.org/pub/archive/fedora/linux/'
+         'releases/28/Everything/x86_64/os/images/pxeboot/vmlinuz'),
+        'd05909c9d4a742a6fcc84dcc0361009e4611769619cc187a07107579a035f24e')
+
+    def test_with_2gib_file_should_exit_error_msg_with_linux_v3_6(self):
+        """
+        Pretends to boot QEMU with an initrd file with size of 2GiB
+        and expect it exits with error message.
+        Fedora-18 shipped with linux-3.6 which have not supported xloadflags
+        cannot support more than 2GiB initrd.
+        """
+        self.set_machine('pc')
+        kernel_path = self.ASSET_F18_KERNEL.fetch()
+        max_size = 2 * (1024 ** 3) - 1
+
+        with tempfile.NamedTemporaryFile() as initrd:
+            initrd.seek(max_size)
+            initrd.write(b'\0')
+            initrd.flush()
+            self.vm.add_args('-kernel', kernel_path, '-initrd', initrd.name,
+                             '-m', '4096')
+            self.vm.set_qmp_monitor(enabled=False)
+            self.vm.launch()
+            self.vm.wait()
+            self.assertEqual(self.vm.exitcode(), 1)
+            expected_msg = r'.*initrd is too large.*max: \d+, need %s.*' % (
+                max_size + 1)
+            self.assertRegex(self.vm.get_log(), expected_msg)
+
+    @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
+    def test_with_2gib_file_should_work_with_linux_v4_16(self):
+        """
+        QEMU has supported up to 4 GiB initrd for recent kernel
+        Expect guest can reach 'Unpacking initramfs...'
+        """
+        self.set_machine('pc')
+        kernel_path = self.ASSET_F28_KERNEL.fetch()
+        max_size = 2 * (1024 ** 3) + 1
+
+        with tempfile.NamedTemporaryFile() as initrd:
+            initrd.seek(max_size)
+            initrd.write(b'\0')
+            initrd.flush()
+
+            self.vm.set_console()
+            kernel_command_line = 'console=ttyS0'
+            self.vm.add_args('-kernel', kernel_path,
+                             '-append', kernel_command_line,
+                             '-initrd', initrd.name,
+                             '-m', '5120')
+            self.vm.launch()
+            console = self.vm.console_socket.makefile()
+            console_logger = logging.getLogger('console')
+            while True:
+                msg = console.readline()
+                console_logger.debug(msg.strip())
+                if 'Unpacking initramfs...' in msg:
+                    break
+                if 'Kernel panic - not syncing' in msg:
+                    self.fail("Kernel panic reached")
+
+if __name__ == '__main__':
+    QemuSystemTest.main()