tests: add openEuler source metalink test to mock-core-configs

The openEuler metalink service exposes source repos only via the
``path=openeuler/<dir>/...`` form, which (unlike the ``repo=`` form)
does not translate the ``$releasever`` dnf variable into the full
mirror directory name.  A source metalink relying on ``$releasever``
therefore resolves to a non-existent path and silently breaks
``mock --sources``.

Add a lightweight test that parses the shipped openEuler templates
directly (no mock runtime, no network) and asserts that no ``path=``
metalink depends on ``$releasever``.  The test lives in
mock-core-configs, where the configs ship, so it runs in the package
%check rather than depending on the mock source tree.

BuildRequires python3-pytest and run the suite in %check.

Assisted-By: pi

Author: pkking

mock-core-configs/mock-core-configs.spec

@@ -16,6 +16,7 @@ URL:        https://github.com/rpm-software-management/mock/
 # tito build --tgz
 Source:     https://github.com/rpm-software-management/mock/releases/download/%{name}-%{version}-1/%{name}-%{version}.tar.gz
 BuildArch:  noarch
+BuildRequires: python3-pytest
 
 # The mock.rpm requires this.  Other packages may provide this if they tend to
 # replace the mock-core-configs.rpm functionality.
@@ -82,6 +83,11 @@ mock_docs=${mock_docs//mock-core-configs/mock}
 mock_docs=${mock_docs//-%version/-*}
 sed -i "s~@MOCK_DOCS@~$mock_docs~" %{buildroot}%{_sysconfdir}/mock/site-defaults.cfg
 
+%check
+# Validate the shipped templates directly from the source tree (the configs
+# live in mock-core-configs, not the mock package).
+PYTHONPATH=. python3 -m pytest tests
+
 %post
 if [ -s /etc/os-release ]; then
     # fedora and rhel7+

mock-core-configs/tests/__init__.py

@@ -0,0 +1,48 @@
+"""
+Tests for the openEuler chroot templates shipped in mock-core-configs.
+
+The openEuler metalink service exposes source repos only via the
+``path=openeuler/<dir>/...`` form.  Unlike the ``repo=`` form, ``path=`` does
+*not* translate the ``$releasever`` dnf variable into the full mirror
+directory name (e.g. ``24.03LTS_SP4`` -> ``openEuler-24.03-LTS-SP4``), so a
+source metalink that relies on ``$releasever`` resolves to a non-existent
+path and silently breaks ``mock --sources``.
+
+These tests parse the shipped templates directly (no mock runtime, no
+network) and assert that no ``path=`` metalink depends on ``$releasever``.
+"""
+
+import os
+
+import pytest
+
+# The tests live in mock-core-configs/tests/, the templates in
+# mock-core-configs/etc/mock/templates/.
+TEMPLATE_DIR = os.path.join(
+    os.path.dirname(os.path.dirname(os.path.realpath(__file__))),
+    "etc", "mock", "templates",
+)
+
+OPENEULER_TEMPLATES = [
+    f for f in os.listdir(TEMPLATE_DIR)
+    if f.startswith("openeuler-") and f.endswith(".tpl")
+]
+
+
+@pytest.mark.parametrize("template", [pytest.param(t, id=t) for t in OPENEULER_TEMPLATES])
+def test_path_metalink_does_not_use_releasever(template):
+    """``path=`` metalinks must not depend on ``$releasever``.
+
+    The metalink ``path=`` form is taken literally and is never translated,
+    so a ``$releasever`` in it would point at a path that does not exist.
+    """
+    with open(os.path.join(TEMPLATE_DIR, template), encoding="utf-8") as handle:
+        for line in handle:
+            stripped = line.strip()
+            if not stripped.startswith("metalink=") or "path=" not in stripped:
+                continue
+            assert "$releasever" not in line, (
+                f"{template}: source metalink uses the untranslated "
+                f"$releasever in a path= form, which the metalink service "
+                f"does not translate:\n  {stripped}"
+            )