test: add new target "coverage"

[giuseppe]

add a new target "make coverage" to generate the lcov coverage report for the tests suite.

Most of the changes were done with Claude Code.

It is the first step to get more coverage in our tests.

Summary by Sourcery

Add configurable code coverage support to the build and introduce richer, structured logging and skip reasons in the Python test suite.

Build:

• Introduce --enable-coverage configure option with gcov/lcov/gcovr integration and corresponding Makefile coverage targets and flags.

Tests:

• Enhance Python tests to return structured skip reasons and improve diagnostics via a shared logger and additional /tmp mount.
• Adjust many tests to hide container stderr by default to reduce noise while preserving detailed error logging.
• Add a tmpfs /tmp mount to the base test configuration and tweak some test setups/cleanup for robustness.

[sourcery-ai[bot]]

Reviewer's Guide

Adds optional code coverage support (configure flag, compiler/linker flags, and make coverage targets) and refactors the Python test suite to use a shared logger, structured skip reasons, quieter run_and_get_output calls, and more robust TAP-style diagnostics and cleanup behavior.

File-Level Changes

Change	Details	Files
Introduce configurable code coverage support and make targets driven by gcov/lcov/gcovr.	Add --enable-coverage configure flag that wires up GCOV/LCOV/GCOVR detection and exposes COVERAGE_CFLAGS/COVERAGE_LDFLAGS via autotools Apply coverage CFLAGS/LDFLAGS to libcrun, the crun binary, and the testing library when ENABLE_COVERAGE is set Add non-parallel coverage-* make targets (clean/reset/check/html/xml/summary) that run the test suite serially and post-process coverage data, plus hook coverage-clean into clean-local Adjust maint.mk coverage output directory and gen-coverage behavior, and mark coverage-related phony targets as non-parallel	configure.ac Makefile.am maint.mk
Standardize Python test logging, error reporting, and TAP output handling across the test suite.	Introduce a shared logger in tests_utils configured to emit TAP-style diagnostics to stderr, and export it for use in test modules Replace direct sys.stderr writes and some prints in tests with logger.info/logger.error calls to keep diagnostics consistent and parseable Extend the TAP runner in tests_utils to support timing-based slow-test warnings and richer exception diagnostics (including subprocess return codes, commands, and traces)	tests/tests_utils.py tests/test_devices.py tests/test_mounts.py tests/test_exec.py tests/test_delete.py tests/test_resources.py tests/test_uid_gid.py tests/test_capabilities.py tests/test_oci_features.py tests/test_hostname.py tests/test_mounts.py tests/test_oci_features.py tests/test_cwd.py tests/test_limits.py tests/test_seccomp.py tests/test_bpf_devices.py tests/test_domainname.py tests/test_pid.py tests/test_rlimits.py tests/test_time.py tests/test_tty.py tests/test_hooks.py tests/test_start.py tests/test_mempolicy.py
Make tests more automation-friendly by returning structured skip reasons and reducing noisy stderr from helpers.	Change many tests to return (77, "reason") instead of bare 77 and adjust the TAP runner to print the reason in the #SKIP annotation Pass hide_stderr=True into run_and_get_output in many tests to prevent command stderr from polluting TAP output while still logging via the shared logger Improve robustness in several tests (e.g., more careful cleanup, safer handling when prerequisites like NUMA hardware, systemd, BPF, or /dev/fuse are missing)	tests/tests_utils.py tests/test_mempolicy.py tests/test_start.py tests/test_devices.py tests/test_mounts.py tests/test_exec.py tests/test_delete.py tests/test_resources.py tests/test_uid_gid.py tests/test_capabilities.py tests/test_limits.py tests/test_seccomp.py tests/test_bpf_devices.py tests/test_time.py tests/test_tty.py tests/test_bpf_devices.py tests/test_update.py tests/test_pid_file.py tests/test_init.c (via tests_init_CFLAGS in Makefile.am)
Tighten and extend container test behavior (tmpfs /tmp, mounts, idmapped mounts, cgroups, etc.) to be more deterministic and debuggable.	Add a tmpfs /tmp mount with fixed mode/size to the default base_config to ensure predictable tmp directory behavior inside containers Refine various mount-, idmapped mount-, and device-related tests to use clearer expectations, better cleanup, and more structured logging of mismatches Add a small CFLAGS tweak for tests/init to enable debug info and optimization level suitable for coverage and debugging	tests/tests_utils.py tests/test_mounts.py tests/test_devices.py tests/test_update.py Makefile.am

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[packit-as-a-service[bot]]

Ephemeral COPR build failed. @containers/packit-build please check.

[packit-as-a-service[bot]]

TMT tests failed. @containers/packit-build please check.

[giuseppe]

fuzzing CI fixed here: https://github.com/containers/crun/pull/1922

[giuseppe]

@jnovy PTAL

[giuseppe]

@jnovy thanks! Fixed now

[jnovy]

The rest is looking good - it currently covers 29% but it's a good starting point. LGTM