ci: print group section lines for GitHub workflow

Partially fixes: systemd#2361

.github/workflows/ci.yml

@@ -174,6 +174,7 @@ jobs:
             --tb=no \
             --capture=no \
             --verbose \
+            --ci-sections \
             -m integration \
             --distribution ${{ matrix.distro }} \
             --tools-tree-distribution ${{ matrix.tools }} \

tests/__init__.py

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: LGPL-2.1+
 
+import contextlib
 import os
 import subprocess
 import sys
@@ -167,3 +168,12 @@ def suspend_capture_stdin(pytestconfig: Any) -> Iterator[None]:
 
     if pytestconfig.getoption("capture") == "no":
         capmanager.resume_global_capture()
+
+
+@contextlib.contextmanager
+def ci_group(s: str) -> Iterator[None]:
+    print(f"\n::group::{s}", flush=True)
+    try:
+        yield
+    finally:
+        print("\n::endgroup::", flush=True)

tests/conftest.py

@@ -1,12 +1,14 @@
 # SPDX-License-Identifier: LGPL-2.1+
+import contextlib
+from collections.abc import Iterator
 from typing import Any, cast
 
 import pytest
 
 from mkosi.config import parse_config
 from mkosi.distributions import Distribution, detect_distribution
 
-from . import Image
+from . import Image, ci_group
 
 
 def pytest_addoption(parser: Any) -> None:
@@ -38,6 +40,11 @@ def pytest_addoption(parser: Any) -> None:
         help="Pass --debug-shell when running mkosi",
         action="store_true",
     )
+    parser.addoption(
+        "--ci-sections",
+        help="Print GitHub Workflow section markers before and after each test",
+        action="store_true",
+    )
 
 
 @pytest.fixture(scope="session")
@@ -50,3 +57,9 @@ def config(request: Any) -> Image.Config:
         tools_tree_distribution=cast(Distribution, request.config.getoption("--tools-tree-distribution")),
         debug_shell=request.config.getoption("--debug-shell"),
     )
+
+
+@pytest.fixture(autouse=True)
+def ci_sections(request: Any) -> Iterator[None]:
+    with ci_group(request.node.name) if request.config.getoption("--ci-sections") else contextlib.nullcontext():
+        yield

tests/test_initrd.py

@@ -8,6 +8,7 @@
 import time
 from collections.abc import Iterator
 from pathlib import Path
+from typing import Any
 
 import pytest
 
@@ -20,7 +21,7 @@
 from mkosi.user import INVOKING_USER
 from mkosi.versioncomp import GenericVersion
 
-from . import Image
+from . import Image, ci_group
 
 pytestmark = pytest.mark.integration
 
@@ -39,14 +40,21 @@ def passphrase() -> Iterator[Path]:
 
 
 @pytest.fixture(scope="module")
-def initrd(config: Image.Config) -> Iterator[Image]:
-    with Image(
-        config,
-        options=[
-            "--directory", "",
-            "--include=mkosi-initrd/",
-        ],
-    ) as initrd:
+def initrd(request: Any, config: Image.Config) -> Iterator[Image]:
+    with (
+        (
+            ci_group(f"Initrd image {config.distribution}/{config.release}")
+            if request.config.getoption("--ci-sections") else
+            contextlib.nullcontext()
+        ),
+        Image(
+            config,
+            options=[
+                "--directory", "",
+                "--include=mkosi-initrd/",
+            ],
+        ) as initrd
+    ):
         if initrd.config.distribution == Distribution.rhel_ubi:
             pytest.skip("Cannot build RHEL-UBI initrds")