Re: [Buildroot] [PATCH 3/3] support/testing: add bpftrace test

[Thomas Perale via buildroot <buildroot@buildroot.org>]

In reply of:
> This commit adds a simple bpftrace test that ensures that not only it
> builds fine, but it also runs properly on a minimal test scenario.
> 
> Assisted-by: GPT-5.6
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

Applied to 2025.02.x & 2026.05.x. Thanks

> ---
>  DEVELOPERS                                    |  2 +
>  .../testing/tests/package/test_bpftrace.py    | 66 +++++++++++++++++++
>  .../test_bpftrace/linux-bpftrace.fragment     |  4 ++
>  3 files changed, 72 insertions(+)
>  create mode 100644 support/testing/tests/package/test_bpftrace.py
>  create mode 100644 support/testing/tests/package/test_bpftrace/linux-bpftrace.fragment
> 
> diff --git a/DEVELOPERS b/DEVELOPERS
> index 5eb438906f..080aaac5e0 100644
> --- a/DEVELOPERS
> +++ b/DEVELOPERS
> @@ -3297,6 +3297,8 @@ F:	support/testing/tests/package/sample_python_flask_expects_json.py
>  F:	support/testing/tests/package/sample_python_git.py
>  F:	support/testing/tests/package/sample_python_pyudev.py
>  F:	support/testing/tests/package/sample_python_unittest_xml_reporting.py
> +F:	support/testing/tests/package/test_bpftrace.py
> +F:	support/testing/tests/package/test_bpftrace/linux-bpftrace.fragment
>  F:	support/testing/tests/package/test_nodejs.py
>  F:	support/testing/tests/package/test_python_augeas.py
>  F:	support/testing/tests/package/test_python_crccheck.py
> diff --git a/support/testing/tests/package/test_bpftrace.py b/support/testing/tests/package/test_bpftrace.py
> new file mode 100644
> index 0000000000..70ccfe8b20
> --- /dev/null
> +++ b/support/testing/tests/package/test_bpftrace.py
> @@ -0,0 +1,66 @@
> +import os
> +
> +import infra.basetest
> +
> +
> +# gitlab-runner: 2xlarge
> +class TestBpftrace(infra.basetest.BRTest):
> +    kern_fragment = infra.filepath(
> +        "tests/package/test_bpftrace/linux-bpftrace.fragment"
> +    )
> +    config = f"""
> +        BR2_aarch64=y
> +        BR2_TOOLCHAIN_EXTERNAL=y
> +        BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
> +        BR2_LINUX_KERNEL=y
> +        BR2_LINUX_KERNEL_CUSTOM_VERSION=y
> +        BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.6.32"
> +        BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
> +        BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/aarch64-virt/linux.config"
> +        BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="{kern_fragment}"
> +        BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
> +        BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
> +        BR2_PACKAGE_BPFTRACE=y
> +        BR2_PACKAGE_TAR=y
> +        BR2_TARGET_ROOTFS_EXT2=y
> +        BR2_TARGET_ROOTFS_EXT2_4=y
> +        BR2_TARGET_ROOTFS_EXT2_SIZE="256M"
> +        # BR2_TARGET_ROOTFS_TAR is not set
> +        """
> +
> +    def test_run(self):
> +        drive = os.path.join(self.builddir, "images", "rootfs.ext4")
> +        kern = os.path.join(self.builddir, "images", "Image")
> +        self.emulator.boot(
> +            arch="aarch64",
> +            kernel=kern,
> +            kernel_cmdline=["root=/dev/vda console=ttyAMA0"],
> +            options=[
> +                "-M",
> +                "virt",
> +                "-cpu",
> +                "cortex-a57",
> +                "-m",
> +                "256M",
> +                "-drive",
> +                f"file={drive},if=virtio,format=raw",
> +            ],
> +        )
> +        self.emulator.login()
> +
> +        self.assertRunOk("mount -t debugfs none /sys/kernel/debug/")
> +
> +        # Check that bpftrace can find a syscall tracepoint.
> +        self.assertRunOk("bpftrace -l 'tracepoint:syscalls:sys_enter_execve'")
> +
> +        # Compile and attach a tracepoint program, then trigger it with the
> +        # command executed by bpftrace. The marker avoids matching volatile
> +        # fields such as PIDs or command names.
> +        cmd = (
> +            "bpftrace -e 'tracepoint:syscalls:sys_enter_execve "
> +            '{ printf("buildroot-bpftrace-test\\n"); exit(); }\' '
> +            "-c /bin/true"
> +        )
> +        output, ret = self.emulator.run(cmd)
> +        self.assertEqual(ret, 0)
> +        self.assertIn("buildroot-bpftrace-test", "\n".join(output))
> diff --git a/support/testing/tests/package/test_bpftrace/linux-bpftrace.fragment b/support/testing/tests/package/test_bpftrace/linux-bpftrace.fragment
> new file mode 100644
> index 0000000000..35359b08f6
> --- /dev/null
> +++ b/support/testing/tests/package/test_bpftrace/linux-bpftrace.fragment
> @@ -0,0 +1,4 @@
> +CONFIG_FTRACE=y
> +CONFIG_FTRACE_SYSCALLS=y
> +CONFIG_FUNCTION_TRACER=y
> +CONFIG_KPROBES=y
> -- 
> 2.55.0
> 
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