Fix 500 error when using flatpak with reclaimed content

fixes: #1887
(cherry picked from commit 88b2002)

Author: gerrod3

Diff for: CHANGES/1887.bugfix

@@ -0,0 +1 @@
+Fixed flatpak index returning 500 when Manifest content was on_demand or had been reclaimed.

Diff for: pulp_container/app/registry_api.py

@@ -580,6 +580,32 @@ def recurse_through_manifest_lists(self, tag, manifest, oss, architectures, mani
                     tag, mlm.manifest_list, oss, architectures, manifests
                 )
 
+    def get_manifest_config(self, manifest):
+        # Special handling for the manifest's config options not being fully stored on the model yet
+        # See migrations 38 & 43
+        config = {
+            "labels": manifest.labels,
+            "architecture": manifest.architecture,
+            "os": manifest.os,
+        }
+        if any(not config[value] for value in ("labels", "architecture", "os")):
+            # Try to read the original config blob, could be missing if user did a reclaim :(
+            if manifest.config_blob:
+                try:
+                    config_artifact = manifest.config_blob._artifacts.get()
+                except Artifact.DoesNotExist:
+                    log.warning(f"Manifest {manifest.pk}'s config blob was not found.")
+                else:
+                    with storage.open(config_artifact.file.name) as file:
+                        raw_data = file.read()
+                    config_data = json.loads(raw_data)
+                    config["labels"] = config_data.get("config", {}).get("Labels")
+                    config["os"] = config_data["os"]
+                    config["architecture"] = config_data["architecture"]
+            else:
+                log.warning(f"Manifest {manifest.pk} has no config blob.")
+        return config
+
     def get(self, request):
         req_repositories = None
         req_tags = None
@@ -636,10 +662,8 @@ def get(self, request):
                     tag.name, tag.tagged_manifest, req_oss, req_architectures, manifests
                 )
             for manifest, tagged in manifests.items():
-                with storage.open(manifest.config_blob._artifacts.get().file.name) as file:
-                    raw_data = file.read()
-                config_data = json.loads(raw_data)
-                labels = config_data.get("config", {}).get("Labels")
+                config_data = self.get_manifest_config(manifest)
+                labels = config_data["labels"]
                 if not labels:
                     continue
                 if any(label not in labels.keys() for label in req_label_exists):

Diff for: pulp_container/tests/functional/api/test_flatpak.py

@@ -3,47 +3,18 @@
 import pytest
 import subprocess
 
-from django.conf import settings
-
 from pulp_container.tests.functional.constants import REGISTRY_V2
 
 
-def test_flatpak_install(
-    add_to_cleanup,
-    registry_client,
-    local_registry,
-    container_namespace_api,
-    container_push_repository_api,
-    container_tag_api,
-    container_manifest_api,
-):
-    if not settings.FLATPAK_INDEX:
-        pytest.skip("This test requires FLATPAK_INDEX to be enabled")
-
-    image_path1 = f"{REGISTRY_V2}/pulp/oci-net.fishsoup.busyboxplatform:latest"
-    registry_client.pull(image_path1)
-    local_registry.tag_and_push(image_path1, "pulptest/oci-net.fishsoup.busyboxplatform:latest")
-    image_path2 = f"{REGISTRY_V2}/pulp/oci-net.fishsoup.hello:latest"
-    registry_client.pull(image_path2)
-    local_registry.tag_and_push(image_path2, "pulptest/oci-net.fishsoup.hello:latest")
-    namespace = container_namespace_api.list(name="pulptest").results[0]
-    add_to_cleanup(container_namespace_api, namespace.pulp_href)
-
-    repo = container_push_repository_api.list(name="pulptest/oci-net.fishsoup.hello").results[0]
-    tag = container_tag_api.list(repository_version=repo.latest_version_href).results[0]
-    manifest = container_manifest_api.read(tag.tagged_manifest)
-
-    assert manifest.is_flatpak
-    assert not manifest.is_bootable
-
+def run_flatpak_commands(pulp_settings):
     # Install flatpak:
     subprocess.check_call(
         [
             "flatpak",
             "--user",
             "remote-add",
             "pulptest",
-            "oci+" + settings.CONTENT_ORIGIN,
+            "oci+" + pulp_settings.CONTENT_ORIGIN,
         ]
     )
     # See <https://pagure.io/fedora-lorax-templates/c/cc1155372046baa58f9d2cc27a9e5473bf05a3fb>
@@ -81,3 +52,86 @@ def test_flatpak_install(
         ]
     )
     subprocess.run(["flatpak", "--user", "remote-delete", "pulptest"])
+
+
+def test_flatpak_install(
+    add_to_cleanup,
+    registry_client,
+    local_registry,
+    container_namespace_api,
+    container_push_repository_api,
+    container_tag_api,
+    container_manifest_api,
+    pulp_settings,
+):
+    if not pulp_settings.FLATPAK_INDEX:
+        pytest.skip("This test requires FLATPAK_INDEX to be enabled")
+
+    image_path1 = f"{REGISTRY_V2}/pulp/oci-net.fishsoup.busyboxplatform:latest"
+    registry_client.pull(image_path1)
+    local_registry.tag_and_push(image_path1, "pulptest/oci-net.fishsoup.busyboxplatform:latest")
+    image_path2 = f"{REGISTRY_V2}/pulp/oci-net.fishsoup.hello:latest"
+    registry_client.pull(image_path2)
+    local_registry.tag_and_push(image_path2, "pulptest/oci-net.fishsoup.hello:latest")
+    namespace = container_namespace_api.list(name="pulptest").results[0]
+    add_to_cleanup(container_namespace_api, namespace.pulp_href)
+
+    repo = container_push_repository_api.list(name="pulptest/oci-net.fishsoup.hello").results[0]
+    tag = container_tag_api.list(repository_version=repo.latest_version_href).results[0]
+    manifest = container_manifest_api.read(tag.tagged_manifest)
+
+    assert manifest.is_flatpak
+    assert not manifest.is_bootable
+
+    run_flatpak_commands(pulp_settings)
+
+
+def test_flatpak_on_demand(
+    container_tag_api,
+    container_manifest_api,
+    container_repository_factory,
+    container_remote_factory,
+    container_sync,
+    container_distribution_factory,
+    container_namespace_api,
+    pulpcore_bindings,
+    monitor_task,
+    add_to_cleanup,
+    pulp_settings,
+):
+    if not pulp_settings.FLATPAK_INDEX:
+        pytest.skip("This test requires FLATPAK_INDEX to be enabled")
+
+    # Set up repositories with immediate sync
+    remote1 = container_remote_factory(
+        upstream_name="pulp/oci-net.fishsoup.busyboxplatform", include_tags=["latest"]
+    )
+    remote2 = container_remote_factory(
+        upstream_name="pulp/oci-net.fishsoup.hello", include_tags=["latest"]
+    )
+    repo1 = container_repository_factory(remote=remote1.pulp_href)
+    repo2 = container_repository_factory(remote=remote2.pulp_href)
+    container_sync(repo1)
+    container_sync(repo2)
+    container_distribution_factory(
+        base_path="pulptest/oci-net.fishsoup.busyboxplatform", repository=repo1.pulp_href
+    )
+    container_distribution_factory(
+        base_path="pulptest/oci-net.fishsoup.hello", repository=repo2.pulp_href
+    )
+    namespace = container_namespace_api.list(name="pulptest").results[0]
+    add_to_cleanup(container_namespace_api, namespace.pulp_href)
+
+    # Assert the repos were set up correctly
+    tag = container_tag_api.list(repository_version=f"{repo2.versions_href}1/").results[0]
+    manifest = container_manifest_api.read(tag.tagged_manifest)
+    assert manifest.is_flatpak
+    assert not manifest.is_bootable
+
+    # reclaim disk space to turn the manifests + config-blogs into on-demand
+    reclaim_response = pulpcore_bindings.RepositoriesReclaimSpaceApi.reclaim(
+        {"repo_hrefs": [repo1.pulp_href, repo2.pulp_href]}
+    )
+    monitor_task(reclaim_response.task)
+
+    run_flatpak_commands(pulp_settings)

Diff for: pulp_container/tests/functional/conftest.py

@@ -434,6 +434,17 @@ def _sync(repo, remote=None):
     return _sync
 
 
+@pytest.fixture
+def container_distribution_factory(container_distribution_api, gen_object_with_cleanup):
+    def _container_distribution_factory(**kwargs):
+        distro = {"name": str(uuid4()), "base_path": str(uuid4())}
+        if kwargs:
+            distro.update(kwargs)
+        return gen_object_with_cleanup(container_distribution_api, distro)
+
+    return _container_distribution_factory
+
+
 @pytest.fixture
 def pull_through_distribution(
     gen_object_with_cleanup,