test: Add weak modules test

Signed-off-by: Rafal Stefanowski <rafal.stefanowski@intel.com>

test/functional/tests/misc/test_weak_modules.py

@@ -0,0 +1,104 @@
+#
+# Copyright(c) 2022 Intel Corporation
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+
+import os
+import re
+
+from api.cas.installer import clean_opencas_repo, rsync_opencas_sources
+from core.test_run import TestRun
+from test_tools.fs_utils import (
+    check_if_regular_file_exists,
+    check_if_symlink_exists,
+    readlink,
+    remove,
+)
+from test_tools.packaging import Packages
+
+
+modules_links_dir = "/lib/modules/$(uname -r)/weak-updates/block/opencas"
+modules_names = ["cas_cache.ko", "cas_disk.ko"]
+
+
+def test_weak_modules():
+    """
+    title: Test for weak-modules symlinks handling.
+    description: |
+      Test if symlinks for CAS modules in kernels's weak-updates directory
+      are properly created and removed during RPM package install/uninstall.
+    pass_criteria:
+      - working symlinks for CAS modules are created after installation
+      - no broken symlinks are left after uninstallation
+    """
+
+    with TestRun.step("Check for supported RPM based OS distribution"):
+        distro_id_like = TestRun.executor.run_expect_success(
+            "grep -i ID_LIKE /etc/os-release"
+        ).stdout
+
+        if not re.search("rhel|fedora", distro_id_like):
+            distro_id_like = distro_id_like.split("=")[1].strip("\"'")
+            TestRun.LOGGER.error(
+                f"OS type - {distro_id_like}: this distribution "
+                f"does not support weak-modules mechanism"
+            )
+            return
+
+    with TestRun.step("Create RPM packages"):
+        rsync_opencas_sources()
+        clean_opencas_repo()
+
+        cas_pkg = Packages()
+        cas_pkg.create(TestRun.usr.working_dir)
+
+    with TestRun.step("Remove any previous installations and cleanup"):
+        cas_pkg.uninstall("open-cas-linux")
+        remove(modules_links_dir, recursive=True, force=True)
+
+    with TestRun.step("Install RPM packages and check for module symlinks"):
+        cas_pkg.install()
+
+        missing_links = []
+        for module in modules_names:
+            module_link = os.path.join(modules_links_dir, module)
+            if not check_if_symlink_exists(module_link):
+                resolved_path = TestRun.executor.run_expect_success(f"echo {module_link}").stdout
+                missing_links.append(resolved_path)
+
+        if missing_links:
+            TestRun.fail(
+                f"No CAS modules links found in weak-updates directory "
+                f"after installation:\n{', '.join(missing_links)}"
+            )
+
+        broken_links = []
+        for module in modules_names:
+            module_link = os.path.join(modules_links_dir, module)
+            module_file = readlink(module_link)
+            if not check_if_regular_file_exists(module_file):
+                resolved_path = TestRun.executor.run_expect_success(f"echo {module_link}").stdout
+                broken_links.append(resolved_path)
+
+        if broken_links:
+            TestRun.fail(
+                f"Broken CAS modules links found in weak-updates directory "
+                f"after installation:\n{', '.join(broken_links)}"
+            )
+
+    with TestRun.step("Uninstall RPM packages and check if symlinks were removed"):
+        cas_pkg.uninstall()
+
+        existing_links = []
+        for module in modules_names:
+            module_link = os.path.join(modules_links_dir, module)
+            if check_if_symlink_exists(module_link):
+                resolved_path = TestRun.executor.run_expect_success(f"echo {module_link}").stdout
+                existing_links.append(resolved_path)
+
+        if existing_links:
+            TestRun.fail(
+                f"CAS modules links found in weak-updates directory "
+                f"after uninstallation:\n{', '.join(existing_links)}"
+            )