scripts/sbom: setup sbom logging

Add logging infrastructure for warnings and errors.
Errors and warnings are accumulated and summarized in the end.

Assisted-by: Cursor:claude-sonnet-4-5
Assisted-by: OpenCode:GLM-4-7
Co-developed-by: Maximilian Huber <maximilian.huber@tngtech.com>
Signed-off-by: Maximilian Huber <maximilian.huber@tngtech.com>
Signed-off-by: Luis Augenstein <luis.augenstein@tngtech.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

scripts/sbom/sbom.py

@@ -6,9 +6,33 @@
 Compute software bill of materials in SPDX format describing a kernel build.
 """
 
+import logging
+import sys
+import sbom.sbom_logging as sbom_logging
+from sbom.config import get_config
+
+
+def _exit_with_summary(write_output_on_error: bool = False) -> None:
+    warning_summary = sbom_logging.summarize_warnings()
+    error_summary = sbom_logging.summarize_errors()
+    if warning_summary:
+        logging.warning(warning_summary)
+    if error_summary:
+        logging.error(error_summary)
+        sys.exit(1)
+
 
 def main():
-    pass
+    # Read config
+    config = get_config()
+
+    # Configure logging
+    logging.basicConfig(
+        level=logging.DEBUG if config.debug else logging.INFO,
+        format="[%(levelname)s] %(message)s",
+    )
+
+    _exit_with_summary(config.write_output_on_error)
 
 
 # Call main method

scripts/sbom/sbom/config.py

@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0-only OR MIT
+# Copyright (C) 2025 TNG Technology Consulting GmbH
+
+import argparse
+from dataclasses import dataclass
+
+
+@dataclass
+class KernelSbomConfig:
+    debug: bool
+    """Whether to enable debug logging."""
+
+
+def _parse_cli_arguments(parser: argparse.ArgumentParser) -> dict[str, bool]:
+    """
+    Parse command-line arguments using argparse.
+
+    Returns:
+        Dictionary of parsed arguments.
+    """
+    parser.add_argument(
+        "--debug",
+        action="store_true",
+        default=False,
+        help="Enable debug logs (default: False)",
+    )
+
+    args = vars(parser.parse_args())
+    return args
+
+
+def get_config() -> KernelSbomConfig:
+    """
+    Parse command-line arguments and construct the configuration object.
+
+    Returns:
+        KernelSbomConfig: Configuration object with all settings for SBOM generation.
+    """
+    parser = argparse.ArgumentParser(
+        description="Generate SPDX SBOM documents for kernel builds",
+    )
+    args = _parse_cli_arguments(parser)
+
+    debug = args["debug"]
+
+    return KernelSbomConfig(debug=debug)

scripts/sbom/sbom/sbom_logging.py

@@ -0,0 +1,94 @@
+# SPDX-License-Identifier: GPL-2.0-only OR MIT
+# Copyright (C) 2025 TNG Technology Consulting GmbH
+
+import logging
+import inspect
+from typing import Literal
+
+
+MessageTemplate = str
+
+
+class MessageLogger:
+    """Logger that suppresses repeated messages and stores a summary of all logged messages."""
+
+    _messages: dict[MessageTemplate, list[str]]
+    _message_counts: dict[MessageTemplate, int]
+    _repeated_logs_limit: int
+    """Maximum number of repeated messages of the same type to log before suppressing further output."""
+
+    def __init__(self, level: Literal["error", "warning"], repeated_logs_limit: int = 3) -> None:
+        self._level = level
+        self._messages = {}
+        self._message_counts = {}
+        self._repeated_logs_limit = repeated_logs_limit
+
+    def log(self, template: MessageTemplate, /, **kwargs: str) -> None:
+        """Log a message based on a template and optional variables. Example: `log("Missing {path}", path=str(p))`."""
+        message = template
+        for key, value in kwargs.items():
+            message = message.replace("{" + key + "}", value)
+        if template not in self._messages:
+            self._messages[template] = []
+            self._message_counts[template] = 0
+        self._message_counts[template] += 1
+        if self._message_counts[template] <= self._repeated_logs_limit:
+            if self._level == "error":
+                logging.error(message)
+            elif self._level == "warning":
+                logging.warning(message)
+            self._messages[template].append(message)
+
+    def get_summary(self) -> str:
+        if len(self._messages) == 0:
+            return ""
+        summary: list[str] = [f"Summarize {self._level}s:"]
+        for template, messages in self._messages.items():
+            for message in messages:
+                summary.append(message)
+            n_suppressed_messages = self._message_counts[template] - self._repeated_logs_limit
+            if n_suppressed_messages > 0:
+                instances = "instance" if n_suppressed_messages == 1 else "instances"
+                summary.append(f"... (Found {n_suppressed_messages} more {instances} of this {self._level})")
+        return "\n".join(summary)
+
+    def has_messages(self) -> bool:
+        return len(self._message_counts) > 0
+
+
+_warning_logger: MessageLogger
+_error_logger: MessageLogger
+
+
+def warning(msg_template: MessageTemplate, /, **kwargs: str) -> None:
+    _warning_logger.log(msg_template, **kwargs)
+
+
+def error(msg_template: MessageTemplate, /, **kwargs: str) -> None:
+    frame = inspect.currentframe()
+    caller_frame = frame.f_back if frame else None
+    info = inspect.getframeinfo(caller_frame) if caller_frame else None
+    if info:
+        msg_template = f'File "{info.filename}", line {info.lineno}, in {info.function}\n{msg_template}'
+    _error_logger.log(msg_template, **kwargs)
+
+
+def summarize_warnings() -> str:
+    return _warning_logger.get_summary()
+
+
+def summarize_errors() -> str:
+    return _error_logger.get_summary()
+
+
+def has_errors() -> bool:
+    return _error_logger.has_messages()
+
+
+def init() -> None:
+    global _warning_logger, _error_logger
+    _warning_logger = MessageLogger("warning")
+    _error_logger = MessageLogger("error")
+
+
+init()