test: add minimal test for ContainersStorageSource.from_args()

sources/test/test_container_storage_source.py

@@ -0,0 +1,28 @@
+#!/usr/bin/python3
+
+import os
+import random
+import socket
+import string
+import subprocess
+
+import pytest
+
+from osbuild.testutil import has_executable, make_container
+
+SOURCES_NAME = "org.osbuild.containers-storage"
+
+
+@pytest.mark.skipif(not has_executable("podman"), reason="no podman executable")
+@pytest.mark.skipif(os.getuid() != 0, reason="root only")
+def test_containers_storage_integration(tmp_path, sources_module):
+    base_tag = "container-" + "".join(random.choices(string.digits, k=12))
+    make_container(tmp_path, base_tag, {
+        "file1": "file1 content",
+    })
+    image_id = subprocess.check_output(["podman", "inspect", "-f", "{{ .Id }}", base_tag],
+                                       universal_newlines=True).strip()
+    checksum = f"sha256:{image_id}"
+    sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+    cnt_storage = sources_module.ContainersStorageSource.from_args(["--service-fd", str(sock.fileno())])
+    assert cnt_storage.exists(checksum, None)