mbedtls/tests/scripts/check-files.py

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#!/usr/bin/env python3
# This file is part of Mbed TLS (https://tls.mbed.org)
# Copyright (c) 2018, Arm Limited, All Rights Reserved
"""
This script checks the current state of the source code for minor issues,
including incorrect file permissions, presence of tabs, non-Unix line endings,
trailing whitespace, and presence of UTF-8 BOM.
Note: requires python 3, must be run from Mbed TLS root.
"""
import os
import argparse
import logging
import codecs
import re
import sys
class FileIssueTracker:
"""Base class for file-wide issue tracking.
To implement a checker that processes a file as a whole, inherit from
this class and implement `check_file_for_issue` and define ``heading``.
``suffix_exemptions``: files whose name ends with a string in this set
will not be checked.
``path_exemptions``: files whose path (relative to the root of the source
tree) matches this regular expression will not be checked. This can be
``None`` to match no path. Paths are normalized and converted to ``/``
separators before matching.
``heading``: human-readable description of the issue
"""
suffix_exemptions = frozenset()
path_exemptions = None
# heading must be defined in derived classes.
# pylint: disable=no-member
def __init__(self):
self.files_with_issues = {}
@staticmethod
def normalize_path(filepath):
"""Normalize ``filepath`` """
filepath = os.path.normpath(filepath)
seps = os.path.sep
if os.path.altsep is not None:
seps += os.path.altsep
return '/'.join(filepath.split(seps))
def should_check_file(self, filepath):
"""Whether the given file name should be checked.
Files whose name ends with a string listed in ``self.suffix_exemptions``
or whose path matches ``self.path_exemptions`` will not be checked.
"""
for files_exemption in self.suffix_exemptions:
if filepath.endswith(files_exemption):
return False
if self.path_exemptions and \
re.match(self.path_exemptions, self.normalize_path(filepath)):
return False
return True
def check_file_for_issue(self, filepath):
"""Check the specified file for the issue that this class is for.
Subclasses must implement this method.
"""
raise NotImplementedError
def record_issue(self, filepath, line_number):
"""Record that an issue was found at the specified location."""
if filepath not in self.files_with_issues.keys():
self.files_with_issues[filepath] = []
self.files_with_issues[filepath].append(line_number)
def output_file_issues(self, logger):
"""Log all the locations where the issue was found."""
if self.files_with_issues.values():
logger.info(self.heading)
for filename, lines in sorted(self.files_with_issues.items()):
if lines:
logger.info("{}: {}".format(
filename, ", ".join(str(x) for x in lines)
))
else:
logger.info(filename)
logger.info("")
BINARY_FILE_PATH_RE_LIST = [
r'docs/.*\.pdf\Z',
r'programs/fuzz/corpuses/[^.]+\Z',
r'tests/data_files/[^.]+\Z',
r'tests/data_files/.*\.(crt|csr|db|der|key|pubkey)\Z',
r'tests/data_files/.*\.req\.[^/]+\Z',
r'tests/data_files/.*malformed[^/]+\Z',
r'tests/data_files/format_pkcs12\.fmt\Z',
]
BINARY_FILE_PATH_RE = re.compile('|'.join(BINARY_FILE_PATH_RE_LIST))
class LineIssueTracker(FileIssueTracker):
"""Base class for line-by-line issue tracking.
To implement a checker that processes files line by line, inherit from
this class and implement `line_with_issue`.
"""
# Exclude binary files.
path_exemptions = BINARY_FILE_PATH_RE
def issue_with_line(self, line, filepath):
"""Check the specified line for the issue that this class is for.
Subclasses must implement this method.
"""
raise NotImplementedError
def check_file_line(self, filepath, line, line_number):
if self.issue_with_line(line, filepath):
self.record_issue(filepath, line_number)
def check_file_for_issue(self, filepath):
"""Check the lines of the specified file.
Subclasses must implement the ``issue_with_line`` method.
"""
with open(filepath, "rb") as f:
for i, line in enumerate(iter(f.readline, b"")):
self.check_file_line(filepath, line, i + 1)
def is_windows_file(filepath):
_root, ext = os.path.splitext(filepath)
return ext in ('.bat', '.dsp', '.sln', '.vcxproj')
class PermissionIssueTracker(FileIssueTracker):
"""Track files with bad permissions.
Files that are not executable scripts must not be executable."""
heading = "Incorrect permissions:"
def check_file_for_issue(self, filepath):
is_executable = os.access(filepath, os.X_OK)
should_be_executable = filepath.endswith((".sh", ".pl", ".py"))
if is_executable != should_be_executable:
self.files_with_issues[filepath] = None
class EndOfFileNewlineIssueTracker(FileIssueTracker):
"""Track files that end with an incomplete line
(no newline character at the end of the last line)."""
heading = "Missing newline at end of file:"
path_exemptions = BINARY_FILE_PATH_RE
def check_file_for_issue(self, filepath):
with open(filepath, "rb") as f:
if not f.read().endswith(b"\n"):
self.files_with_issues[filepath] = None
class Utf8BomIssueTracker(FileIssueTracker):
"""Track files that start with a UTF-8 BOM.
Files should be ASCII or UTF-8. Valid UTF-8 does not start with a BOM."""
heading = "UTF-8 BOM present:"
suffix_exemptions = frozenset([".vcxproj", ".sln"])
path_exemptions = BINARY_FILE_PATH_RE
def check_file_for_issue(self, filepath):
with open(filepath, "rb") as f:
if f.read().startswith(codecs.BOM_UTF8):
self.files_with_issues[filepath] = None
class UnixLineEndingIssueTracker(LineIssueTracker):
"""Track files with non-Unix line endings (i.e. files with CR)."""
heading = "Non-Unix line endings:"
def should_check_file(self, filepath):
if not super().should_check_file(filepath):
return False
return not is_windows_file(filepath)
def issue_with_line(self, line, _filepath):
return b"\r" in line
class WindowsLineEndingIssueTracker(LineIssueTracker):
"""Track files with non-Windows line endings (i.e. CR or LF not in CRLF)."""
heading = "Non-Windows line endings:"
def should_check_file(self, filepath):
if not super().should_check_file(filepath):
return False
return is_windows_file(filepath)
def issue_with_line(self, line, _filepath):
return not line.endswith(b"\r\n") or b"\r" in line[:-2]
class TrailingWhitespaceIssueTracker(LineIssueTracker):
"""Track lines with trailing whitespace."""
heading = "Trailing whitespace:"
suffix_exemptions = frozenset([".dsp", ".md"])
def issue_with_line(self, line, _filepath):
return line.rstrip(b"\r\n") != line.rstrip()
class TabIssueTracker(LineIssueTracker):
"""Track lines with tabs."""
heading = "Tabs present:"
suffix_exemptions = frozenset([
".sln",
"/Makefile",
"/Makefile.inc",
"/generate_visualc_files.pl",
])
def issue_with_line(self, line, _filepath):
return b"\t" in line
class MergeArtifactIssueTracker(LineIssueTracker):
"""Track lines with merge artifacts.
These are leftovers from a ``git merge`` that wasn't fully edited."""
heading = "Merge artifact:"
def issue_with_line(self, line, _filepath):
# Detect leftover git conflict markers.
if line.startswith(b'<<<<<<< ') or line.startswith(b'>>>>>>> '):
return True
if line.startswith(b'||||||| '): # from merge.conflictStyle=diff3
return True
if line.rstrip(b'\r\n') == b'=======' and \
not _filepath.endswith('.md'):
return True
return False
class IntegrityChecker:
"""Sanity-check files under the current directory."""
def __init__(self, log_file):
"""Instantiate the sanity checker.
Check files under the current directory.
Write a report of issues to log_file."""
self.check_repo_path()
self.logger = None
self.setup_logger(log_file)
self.excluded_directories = [
'.git',
'mbed-os',
]
self.excluded_paths = list(map(os.path.normpath, [
'cov-int',
'examples',
]))
self.issues_to_check = [
PermissionIssueTracker(),
EndOfFileNewlineIssueTracker(),
Utf8BomIssueTracker(),
UnixLineEndingIssueTracker(),
WindowsLineEndingIssueTracker(),
TrailingWhitespaceIssueTracker(),
TabIssueTracker(),
MergeArtifactIssueTracker(),
]
@staticmethod
def check_repo_path():
if not all(os.path.isdir(d) for d in ["include", "library", "tests"]):
raise Exception("Must be run from Mbed TLS root")
def setup_logger(self, log_file, level=logging.INFO):
self.logger = logging.getLogger()
self.logger.setLevel(level)
if log_file:
handler = logging.FileHandler(log_file)
self.logger.addHandler(handler)
else:
console = logging.StreamHandler()
self.logger.addHandler(console)
def prune_branch(self, root, d):
if d in self.excluded_directories:
return True
if os.path.normpath(os.path.join(root, d)) in self.excluded_paths:
return True
return False
def check_files(self):
for root, dirs, files in os.walk("."):
dirs[:] = sorted(d for d in dirs if not self.prune_branch(root, d))
for filename in sorted(files):
filepath = os.path.join(root, filename)
for issue_to_check in self.issues_to_check:
if issue_to_check.should_check_file(filepath):
issue_to_check.check_file_for_issue(filepath)
def output_issues(self):
integrity_return_code = 0
for issue_to_check in self.issues_to_check:
if issue_to_check.files_with_issues:
integrity_return_code = 1
issue_to_check.output_file_issues(self.logger)
return integrity_return_code
def run_main():
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument(
"-l", "--log_file", type=str, help="path to optional output log",
)
check_args = parser.parse_args()
integrity_check = IntegrityChecker(check_args.log_file)
integrity_check.check_files()
return_code = integrity_check.output_issues()
sys.exit(return_code)
if __name__ == "__main__":
run_main()