Add longhorn-instance-manager:v1.7.0 build procedure and tests. (#13)

---------

Signed-off-by: Nashwan Azhari <nazhari@cloudbasesolutions.com>

tests/sanity/test_longhorn_instance_manager.py

@@ -0,0 +1,80 @@
+#
+# Copyright 2024 Canonical, Ltd.
+#
+
+import logging
+import sys
+
+import pytest
+from k8s_test_harness.util import docker_util, env_util, platform_util
+
+LOG: logging.Logger = logging.getLogger(__name__)
+
+LOG.addHandler(logging.FileHandler(f"{__name__}.log"))
+LOG.addHandler(logging.StreamHandler(sys.stdout))
+
+
+IMAGE_NAME = "longhorn-instance-manager"
+IMAGE_VERSIONS = ["v1.7.0"]
+
+
+@pytest.mark.abort_on_fail
+@pytest.mark.parametrize("image_version", IMAGE_VERSIONS)
+def test_check_rock_image_contents(image_version):
+    """Test ROCK contains same fileset as original image."""
+
+    architecture = platform_util.get_current_rockcraft_platform_architecture()
+
+    rock_meta = env_util.get_build_meta_info_for_rock_version(
+        IMAGE_NAME, image_version, architecture
+    )
+    rock_image = rock_meta.image
+    original_image = f"longhornio/longhorn-instance-manager:{image_version}"
+
+    dir_to_check = "/usr/local/bin"
+
+    original_image_files = docker_util.list_files_under_container_image_dir(
+        original_image, root_dir=dir_to_check
+    )
+    rock_image_files = docker_util.list_files_under_container_image_dir(
+        rock_image, root_dir=dir_to_check
+    )
+
+    rock_fileset = set(rock_image_files)
+    original_fileset = set(original_image_files)
+
+    original_extra_files = original_fileset - rock_fileset
+    if original_extra_files:
+        pytest.fail(
+            f"Missing some files from the original image: " f"{original_extra_files}"
+        )
+
+    rock_extra_files = rock_fileset - original_fileset
+    if rock_extra_files:
+        pytest.fail(
+            f"Rock has extra files not present in original image: "
+            f"{rock_extra_files}"
+        )
+
+    # Check auxiliary binaries:
+    binary_paths_to_check = [
+        f"/usr/sbin/{bin}"
+        for bin in [
+            "tgt-admin",
+            "tgt-setup-lun",
+            "tgtadm",
+            "tgtd",
+            "tgtimg",
+        ]
+    ]
+    binary_paths_to_check.append("/usr/local/sbin/nvme")
+    binary_paths_to_check.append("/tini")
+
+    docker_util.ensure_image_contains_paths(
+        rock_image,
+        binary_paths_to_check,
+    )
+
+    process = docker_util.run_in_docker(rock_image, ["nvme", "version"])
+    assert "nvme version 2.9.1" in process.stdout
+    assert "libnvme version 1.9" in process.stdout