#!/usr/bin/env python3 """ Purpose This script compares the interfaces of two versions of Mbed TLS, looking for backward incompatibilities between two different Git revisions within an Mbed TLS repository. It must be run from the root of a Git working tree. For the source (API) and runtime (ABI) interface compatibility, this script is a small wrapper around the abi-compliance-checker and abi-dumper tools, applying them to compare the header and library files. For the storage format, this script compares the automatically generated storage tests, and complains if there is a reduction in coverage. The results of the comparison are either formatted as HTML and stored at a configurable location, or are given as a brief list of problems. Returns 0 on success, 1 on ABI/API non-compliance, and 2 if there is an error while running the script. """ # Copyright The Mbed TLS Contributors # SPDX-License-Identifier: Apache-2.0 # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import os import re import sys import traceback import shutil import subprocess import argparse import logging import tempfile import fnmatch from types import SimpleNamespace import xml.etree.ElementTree as ET class AbiChecker: """API and ABI checker.""" def __init__(self, old_version, new_version, configuration): """Instantiate the API/ABI checker. old_version: RepoVersion containing details to compare against new_version: RepoVersion containing details to check configuration.report_dir: directory for output files configuration.keep_all_reports: if false, delete old reports configuration.brief: if true, output shorter report to stdout configuration.check_api: if true, compare ABIs configuration.check_api: if true, compare APIs configuration.check_storage: if true, compare storage format tests configuration.skip_file: path to file containing symbols and types to skip """ self.repo_path = "." self.log = None self.verbose = configuration.verbose self._setup_logger() self.report_dir = os.path.abspath(configuration.report_dir) self.keep_all_reports = configuration.keep_all_reports self.can_remove_report_dir = not (os.path.exists(self.report_dir) or self.keep_all_reports) self.old_version = old_version self.new_version = new_version self.skip_file = configuration.skip_file self.check_abi = configuration.check_abi self.check_api = configuration.check_api if self.check_abi != self.check_api: raise Exception('Checking API without ABI or vice versa is not supported') self.check_storage_tests = configuration.check_storage self.brief = configuration.brief self.git_command = "git" self.make_command = "make" @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): self.log = logging.getLogger() if self.verbose: self.log.setLevel(logging.DEBUG) else: self.log.setLevel(logging.INFO) self.log.addHandler(logging.StreamHandler()) @staticmethod def check_abi_tools_are_installed(): for command in ["abi-dumper", "abi-compliance-checker"]: if not shutil.which(command): raise Exception("{} not installed, aborting".format(command)) def _get_clean_worktree_for_git_revision(self, version): """Make a separate worktree with version.revision checked out. Do not modify the current worktree.""" git_worktree_path = tempfile.mkdtemp() if version.repository: self.log.debug( "Checking out git worktree for revision {} from {}".format( version.revision, version.repository ) ) fetch_output = subprocess.check_output( [self.git_command, "fetch", version.repository, version.revision], cwd=self.repo_path, stderr=subprocess.STDOUT ) self.log.debug(fetch_output.decode("utf-8")) worktree_rev = "FETCH_HEAD" else: self.log.debug("Checking out git worktree for revision {}".format( version.revision )) worktree_rev = version.revision worktree_output = subprocess.check_output( [self.git_command, "worktree", "add", "--detach", git_worktree_path, worktree_rev], cwd=self.repo_path, stderr=subprocess.STDOUT ) self.log.debug(worktree_output.decode("utf-8")) version.commit = subprocess.check_output( [self.git_command, "rev-parse", "HEAD"], cwd=git_worktree_path, stderr=subprocess.STDOUT ).decode("ascii").rstrip() self.log.debug("Commit is {}".format(version.commit)) return git_worktree_path def _update_git_submodules(self, git_worktree_path, version): """If the crypto submodule is present, initialize it. if version.crypto_revision exists, update it to that revision, otherwise update it to the default revision""" update_output = subprocess.check_output( [self.git_command, "submodule", "update", "--init", '--recursive'], cwd=git_worktree_path, stderr=subprocess.STDOUT ) self.log.debug(update_output.decode("utf-8")) if not (os.path.exists(os.path.join(git_worktree_path, "crypto")) and version.crypto_revision): return if version.crypto_repository: fetch_output = subprocess.check_output( [self.git_command, "fetch", version.crypto_repository, version.crypto_revision], cwd=os.path.join(git_worktree_path, "crypto"), stderr=subprocess.STDOUT ) self.log.debug(fetch_output.decode("utf-8")) crypto_rev = "FETCH_HEAD" else: crypto_rev = version.crypto_revision checkout_output = subprocess.check_output( [self.git_command, "checkout", crypto_rev], cwd=os.path.join(git_worktree_path, "crypto"), stderr=subprocess.STDOUT ) self.log.debug(checkout_output.decode("utf-8")) def _build_shared_libraries(self, git_worktree_path, version): """Build the shared libraries in the specified worktree.""" my_environment = os.environ.copy() my_environment["CFLAGS"] = "-g -Og" my_environment["SHARED"] = "1" if os.path.exists(os.path.join(git_worktree_path, "crypto")): my_environment["USE_CRYPTO_SUBMODULE"] = "1" make_output = subprocess.check_output( [self.make_command, "lib"], env=my_environment, cwd=git_worktree_path, stderr=subprocess.STDOUT ) self.log.debug(make_output.decode("utf-8")) for root, _dirs, files in os.walk(git_worktree_path): for file in fnmatch.filter(files, "*.so"): version.modules[os.path.splitext(file)[0]] = ( os.path.join(root, file) ) @staticmethod def _pretty_revision(version): if version.revision == version.commit: return version.revision else: return "{} ({})".format(version.revision, version.commit) def _get_abi_dumps_from_shared_libraries(self, version): """Generate the ABI dumps for the specified git revision. The shared libraries must have been built and the module paths present in version.modules.""" for mbed_module, module_path in version.modules.items(): output_path = os.path.join( self.report_dir, "{}-{}-{}.dump".format( mbed_module, version.revision, version.version ) ) abi_dump_command = [ "abi-dumper", module_path, "-o", output_path, "-lver", self._pretty_revision(version), ] abi_dump_output = subprocess.check_output( abi_dump_command, stderr=subprocess.STDOUT ) self.log.debug(abi_dump_output.decode("utf-8")) version.abi_dumps[mbed_module] = output_path @staticmethod def _normalize_storage_test_case_data(line): """Eliminate cosmetic or irrelevant details in storage format test cases.""" line = re.sub(r'\s+', r'', line) return line def _read_storage_tests(self, directory, filename, storage_tests): """Record storage tests from the given file. Populate the storage_tests dictionary with test cases read from filename under directory. """ at_paragraph_start = True description = None full_path = os.path.join(directory, filename) for line_number, line in enumerate(open(full_path), 1): line = line.strip() if not line: at_paragraph_start = True continue if line.startswith('#'): continue if at_paragraph_start: description = line.strip() at_paragraph_start = False continue if line.startswith('depends_on:'): continue # We've reached a test case data line test_case_data = self._normalize_storage_test_case_data(line) metadata = SimpleNamespace( filename=filename, line_number=line_number, description=description ) storage_tests[test_case_data] = metadata def _get_storage_format_tests(self, version, git_worktree_path): """Generate and record the storage format tests for the specified git version. The version must be checked out at git_worktree_path. """ full_test_list = subprocess.check_output( ['tests/scripts/generate_psa_tests.py', '--list'], cwd=git_worktree_path, ).decode('ascii') storage_test_list = [test_file for test_file in full_test_list.split() # If you change the following condition, update # generate_psa_tests.py accordingly. if 'storage_format' in test_file] subprocess.check_call( ['tests/scripts/generate_psa_tests.py'] + storage_test_list, cwd=git_worktree_path, ) for test_file in storage_test_list: self._read_storage_tests(git_worktree_path, test_file, version.storage_tests) def _cleanup_worktree(self, git_worktree_path): """Remove the specified git worktree.""" shutil.rmtree(git_worktree_path) worktree_output = subprocess.check_output( [self.git_command, "worktree", "prune"], cwd=self.repo_path, stderr=subprocess.STDOUT ) self.log.debug(worktree_output.decode("utf-8")) def _get_abi_dump_for_ref(self, version): """Generate the interface information for the specified git revision.""" git_worktree_path = self._get_clean_worktree_for_git_revision(version) self._update_git_submodules(git_worktree_path, version) if self.check_abi: self._build_shared_libraries(git_worktree_path, version) self._get_abi_dumps_from_shared_libraries(version) if self.check_storage_tests: self._get_storage_format_tests(version, git_worktree_path) self._cleanup_worktree(git_worktree_path) def _remove_children_with_tag(self, parent, tag): children = parent.getchildren() for child in children: if child.tag == tag: parent.remove(child) else: self._remove_children_with_tag(child, tag) def _remove_extra_detail_from_report(self, report_root): for tag in ['test_info', 'test_results', 'problem_summary', 'added_symbols', 'affected']: self._remove_children_with_tag(report_root, tag) for report in report_root: for problems in report.getchildren()[:]: if not problems.getchildren(): report.remove(problems) def _abi_compliance_command(self, mbed_module, output_path): """Build the command to run to analyze the library mbed_module. The report will be placed in output_path.""" abi_compliance_command = [ "abi-compliance-checker", "-l", mbed_module, "-old", self.old_version.abi_dumps[mbed_module], "-new", self.new_version.abi_dumps[mbed_module], "-strict", "-report-path", output_path, ] if self.skip_file: abi_compliance_command += ["-skip-symbols", self.skip_file, "-skip-types", self.skip_file] if self.brief: abi_compliance_command += ["-report-format", "xml", "-stdout"] return abi_compliance_command def _is_library_compatible(self, mbed_module, compatibility_report): """Test if the library mbed_module has remained compatible. Append a message regarding compatibility to compatibility_report.""" output_path = os.path.join( self.report_dir, "{}-{}-{}.html".format( mbed_module, self.old_version.revision, self.new_version.revision ) ) try: subprocess.check_output( self._abi_compliance_command(mbed_module, output_path), stderr=subprocess.STDOUT ) except subprocess.CalledProcessError as err: if err.returncode != 1: raise err if self.brief: self.log.info( "Compatibility issues found for {}".format(mbed_module) ) report_root = ET.fromstring(err.output.decode("utf-8")) self._remove_extra_detail_from_report(report_root) self.log.info(ET.tostring(report_root).decode("utf-8")) else: self.can_remove_report_dir = False compatibility_report.append( "Compatibility issues found for {}, " "for details see {}".format(mbed_module, output_path) ) return False compatibility_report.append( "No compatibility issues for {}".format(mbed_module) ) if not (self.keep_all_reports or self.brief): os.remove(output_path) return True @staticmethod def _is_storage_format_compatible(old_tests, new_tests, compatibility_report): """Check whether all tests present in old_tests are also in new_tests. Append a message regarding compatibility to compatibility_report. """ missing = frozenset(old_tests.keys()).difference(new_tests.keys()) for test_data in sorted(missing): metadata = old_tests[test_data] compatibility_report.append( 'Test case from {} line {} "{}" has disappeared: {}'.format( metadata.filename, metadata.line_number, metadata.description, test_data ) ) compatibility_report.append( 'FAIL: {}/{} storage format test cases have changed or disappeared.'.format( len(missing), len(old_tests) ) if missing else 'PASS: All {} storage format test cases are preserved.'.format( len(old_tests) ) ) compatibility_report.append( 'Info: number of storage format tests cases: {} -> {}.'.format( len(old_tests), len(new_tests) ) ) return not missing def get_abi_compatibility_report(self): """Generate a report of the differences between the reference ABI and the new ABI. ABI dumps from self.old_version and self.new_version must be available.""" compatibility_report = ["Checking evolution from {} to {}".format( self._pretty_revision(self.old_version), self._pretty_revision(self.new_version) )] compliance_return_code = 0 if self.check_abi: shared_modules = list(set(self.old_version.modules.keys()) & set(self.new_version.modules.keys())) for mbed_module in shared_modules: if not self._is_library_compatible(mbed_module, compatibility_report): compliance_return_code = 1 if self.check_storage_tests: if not self._is_storage_format_compatible( self.old_version.storage_tests, self.new_version.storage_tests, compatibility_report): compliance_return_code = 1 for version in [self.old_version, self.new_version]: for mbed_module, mbed_module_dump in version.abi_dumps.items(): os.remove(mbed_module_dump) if self.can_remove_report_dir: os.rmdir(self.report_dir) self.log.info("\n".join(compatibility_report)) return compliance_return_code def check_for_abi_changes(self): """Generate a report of ABI differences between self.old_rev and self.new_rev.""" self.check_repo_path() self.check_abi_tools_are_installed() self._get_abi_dump_for_ref(self.old_version) self._get_abi_dump_for_ref(self.new_version) return self.get_abi_compatibility_report() def run_main(): try: parser = argparse.ArgumentParser( description=( """This script is a small wrapper around the abi-compliance-checker and abi-dumper tools, applying them to compare the ABI and API of the library files from two different Git revisions within an Mbed TLS repository. The results of the comparison are either formatted as HTML and stored at a configurable location, or are given as a brief list of problems. Returns 0 on success, 1 on ABI/API non-compliance, and 2 if there is an error while running the script. Note: must be run from Mbed TLS root.""" ) ) parser.add_argument( "-v", "--verbose", action="store_true", help="set verbosity level", ) parser.add_argument( "-r", "--report-dir", type=str, default="reports", help="directory where reports are stored, default is reports", ) parser.add_argument( "-k", "--keep-all-reports", action="store_true", help="keep all reports, even if there are no compatibility issues", ) parser.add_argument( "-o", "--old-rev", type=str, help="revision for old version.", required=True, ) parser.add_argument( "-or", "--old-repo", type=str, help="repository for old version." ) parser.add_argument( "-oc", "--old-crypto-rev", type=str, help="revision for old crypto submodule." ) parser.add_argument( "-ocr", "--old-crypto-repo", type=str, help="repository for old crypto submodule." ) parser.add_argument( "-n", "--new-rev", type=str, help="revision for new version", required=True, ) parser.add_argument( "-nr", "--new-repo", type=str, help="repository for new version." ) parser.add_argument( "-nc", "--new-crypto-rev", type=str, help="revision for new crypto version" ) parser.add_argument( "-ncr", "--new-crypto-repo", type=str, help="repository for new crypto submodule." ) parser.add_argument( "-s", "--skip-file", type=str, help=("path to file containing symbols and types to skip " "(typically \"-s identifiers\" after running " "\"tests/scripts/list-identifiers.sh --internal\")") ) parser.add_argument( "--check-abi", action='store_true', default=True, help="Perform ABI comparison (default: yes)" ) parser.add_argument("--no-check-abi", action='store_false', dest='check_abi') parser.add_argument( "--check-api", action='store_true', default=True, help="Perform API comparison (default: yes)" ) parser.add_argument("--no-check-api", action='store_false', dest='check_api') parser.add_argument( "--check-storage", action='store_true', default=True, help="Perform storage tests comparison (default: yes)" ) parser.add_argument("--no-check-storage", action='store_false', dest='check_storage') parser.add_argument( "-b", "--brief", action="store_true", help="output only the list of issues to stdout, instead of a full report", ) abi_args = parser.parse_args() if os.path.isfile(abi_args.report_dir): print("Error: {} is not a directory".format(abi_args.report_dir)) parser.exit() old_version = SimpleNamespace( version="old", repository=abi_args.old_repo, revision=abi_args.old_rev, commit=None, crypto_repository=abi_args.old_crypto_repo, crypto_revision=abi_args.old_crypto_rev, abi_dumps={}, storage_tests={}, modules={} ) new_version = SimpleNamespace( version="new", repository=abi_args.new_repo, revision=abi_args.new_rev, commit=None, crypto_repository=abi_args.new_crypto_repo, crypto_revision=abi_args.new_crypto_rev, abi_dumps={}, storage_tests={}, modules={} ) configuration = SimpleNamespace( verbose=abi_args.verbose, report_dir=abi_args.report_dir, keep_all_reports=abi_args.keep_all_reports, brief=abi_args.brief, check_abi=abi_args.check_abi, check_api=abi_args.check_api, check_storage=abi_args.check_storage, skip_file=abi_args.skip_file ) abi_check = AbiChecker(old_version, new_version, configuration) return_code = abi_check.check_for_abi_changes() sys.exit(return_code) except Exception: # pylint: disable=broad-except # Print the backtrace and exit explicitly so as to exit with # status 2, not 1. traceback.print_exc() sys.exit(2) if __name__ == "__main__": run_main()