228d99b57e
The abi_check script has common false positives. Document the intent of each family of checks and typical cases of false positives that can be overridden. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
673 lines
28 KiB
Python
Executable file
673 lines
28 KiB
Python
Executable file
#!/usr/bin/env python3
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"""This script compares the interfaces of two versions of Mbed TLS, looking
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for backward incompatibilities between two different Git revisions within
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an Mbed TLS repository. It must be run from the root of a Git working tree.
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### How the script works ###
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For the source (API) and runtime (ABI) interface compatibility, this script
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is a small wrapper around the abi-compliance-checker and abi-dumper tools,
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applying them to compare the header and library files.
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For the storage format, this script compares the automatically generated
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storage tests and the manual read tests, and complains if there is a
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reduction in coverage. A change in test data will be signaled as a
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coverage reduction since the old test data is no longer present. A change in
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how test data is presented will be signaled as well; this would be a false
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positive.
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The results of the API/ABI comparison are either formatted as HTML and stored
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at a configurable location, or are given as a brief list of problems.
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Returns 0 on success, 1 on non-compliance, and 2 if there is an error
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while running the script.
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### How to interpret non-compliance ###
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This script has relatively common false positives. In many scenarios, it only
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reports a pass if there is a strict textual match between the old version and
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the new version, and it reports problems where there is a sufficient semantic
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match but not a textual match. This section lists some common false positives.
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This is not an exhaustive list: in the end what matters is whether we are
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breaking a backward compatibility goal.
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**API**: the goal is that if an application works with the old version of the
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library, it can be recompiled against the new version and will still work.
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This is normally validated by comparing the declarations in `include/*/*.h`.
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A failure is a declaration that has disappeared or that now has a different
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type.
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* It's ok to change or remove macros and functions that are documented as
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for internal use only or as experimental.
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* It's ok to rename function or macro parameters as long as the semantics
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has not changed.
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* It's ok to change or remove structure fields that are documented as
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private.
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* It's ok to add fields to a structure that already had private fields
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or was documented as extensible.
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**ABI**: the goal is that if an application was built against the old version
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of the library, the same binary will work when linked against the new version.
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This is normally validated by comparing the symbols exported by `libmbed*.so`.
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A failure is a symbol that is no longer exported by the same library or that
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now has a different type.
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* All ABI changes are acceptable if the library version is bumped
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(see `scripts/bump_version.sh`).
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* ABI changes that concern functions which are declared only inside the
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library directory, and not in `include/*/*.h`, are acceptable only if
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the function was only ever used inside the same library (libmbedcrypto,
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libmbedx509, libmbedtls). As a counter example, if the old version
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of libmbedtls calls mbedtls_foo() from libmbedcrypto, and the new version
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of libmbedcrypto no longer has a compatible mbedtls_foo(), this does
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require a version bump for libmbedcrypto.
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**Storage format**: the goal is to check that persistent keys stored by the
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old version can be read by the new version. This is normally validated by
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comparing the `*read*` test cases in `test_suite*storage_format*.data`.
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A failure is a storage read test case that is no longer present with the same
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function name and parameter list.
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* It's ok if the same test data is present, but its presentation has changed,
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for example if a test function is renamed or has different parameters.
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* It's ok if redundant tests are removed.
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**Generated test coverage**: the goal is to check that automatically
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generated tests have as much coverage as before. This is normally validated
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by comparing the test cases that are automatically generated by a script.
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A failure is a generated test case that is no longer present with the same
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function name and parameter list.
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* It's ok if the same test data is present, but its presentation has changed,
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for example if a test function is renamed or has different parameters.
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* It's ok if redundant tests are removed.
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"""
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# Copyright The Mbed TLS Contributors
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import glob
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import os
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import re
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import sys
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import traceback
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import shutil
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import subprocess
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import argparse
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import logging
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import tempfile
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import fnmatch
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from types import SimpleNamespace
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import xml.etree.ElementTree as ET
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class AbiChecker:
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"""API and ABI checker."""
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def __init__(self, old_version, new_version, configuration):
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"""Instantiate the API/ABI checker.
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old_version: RepoVersion containing details to compare against
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new_version: RepoVersion containing details to check
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configuration.report_dir: directory for output files
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configuration.keep_all_reports: if false, delete old reports
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configuration.brief: if true, output shorter report to stdout
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configuration.check_abi: if true, compare ABIs
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configuration.check_api: if true, compare APIs
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configuration.check_storage: if true, compare storage format tests
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configuration.skip_file: path to file containing symbols and types to skip
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"""
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self.repo_path = "."
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self.log = None
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self.verbose = configuration.verbose
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self._setup_logger()
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self.report_dir = os.path.abspath(configuration.report_dir)
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self.keep_all_reports = configuration.keep_all_reports
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self.can_remove_report_dir = not (os.path.exists(self.report_dir) or
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self.keep_all_reports)
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self.old_version = old_version
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self.new_version = new_version
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self.skip_file = configuration.skip_file
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self.check_abi = configuration.check_abi
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self.check_api = configuration.check_api
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if self.check_abi != self.check_api:
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raise Exception('Checking API without ABI or vice versa is not supported')
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self.check_storage_tests = configuration.check_storage
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self.brief = configuration.brief
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self.git_command = "git"
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self.make_command = "make"
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@staticmethod
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def check_repo_path():
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if not all(os.path.isdir(d) for d in ["include", "library", "tests"]):
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raise Exception("Must be run from Mbed TLS root")
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def _setup_logger(self):
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self.log = logging.getLogger()
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if self.verbose:
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self.log.setLevel(logging.DEBUG)
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else:
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self.log.setLevel(logging.INFO)
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self.log.addHandler(logging.StreamHandler())
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@staticmethod
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def check_abi_tools_are_installed():
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for command in ["abi-dumper", "abi-compliance-checker"]:
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if not shutil.which(command):
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raise Exception("{} not installed, aborting".format(command))
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def _get_clean_worktree_for_git_revision(self, version):
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"""Make a separate worktree with version.revision checked out.
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Do not modify the current worktree."""
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git_worktree_path = tempfile.mkdtemp()
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if version.repository:
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self.log.debug(
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"Checking out git worktree for revision {} from {}".format(
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version.revision, version.repository
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)
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)
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fetch_output = subprocess.check_output(
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[self.git_command, "fetch",
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version.repository, version.revision],
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cwd=self.repo_path,
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stderr=subprocess.STDOUT
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)
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self.log.debug(fetch_output.decode("utf-8"))
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worktree_rev = "FETCH_HEAD"
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else:
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self.log.debug("Checking out git worktree for revision {}".format(
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version.revision
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))
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worktree_rev = version.revision
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worktree_output = subprocess.check_output(
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[self.git_command, "worktree", "add", "--detach",
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git_worktree_path, worktree_rev],
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cwd=self.repo_path,
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stderr=subprocess.STDOUT
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)
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self.log.debug(worktree_output.decode("utf-8"))
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version.commit = subprocess.check_output(
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[self.git_command, "rev-parse", "HEAD"],
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cwd=git_worktree_path,
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stderr=subprocess.STDOUT
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).decode("ascii").rstrip()
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self.log.debug("Commit is {}".format(version.commit))
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return git_worktree_path
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def _update_git_submodules(self, git_worktree_path, version):
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"""If the crypto submodule is present, initialize it.
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if version.crypto_revision exists, update it to that revision,
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otherwise update it to the default revision"""
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update_output = subprocess.check_output(
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[self.git_command, "submodule", "update", "--init", '--recursive'],
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cwd=git_worktree_path,
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stderr=subprocess.STDOUT
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)
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self.log.debug(update_output.decode("utf-8"))
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if not (os.path.exists(os.path.join(git_worktree_path, "crypto"))
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and version.crypto_revision):
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return
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if version.crypto_repository:
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fetch_output = subprocess.check_output(
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[self.git_command, "fetch", version.crypto_repository,
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version.crypto_revision],
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cwd=os.path.join(git_worktree_path, "crypto"),
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stderr=subprocess.STDOUT
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)
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self.log.debug(fetch_output.decode("utf-8"))
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crypto_rev = "FETCH_HEAD"
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else:
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crypto_rev = version.crypto_revision
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checkout_output = subprocess.check_output(
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[self.git_command, "checkout", crypto_rev],
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cwd=os.path.join(git_worktree_path, "crypto"),
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stderr=subprocess.STDOUT
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)
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self.log.debug(checkout_output.decode("utf-8"))
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def _build_shared_libraries(self, git_worktree_path, version):
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"""Build the shared libraries in the specified worktree."""
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my_environment = os.environ.copy()
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my_environment["CFLAGS"] = "-g -Og"
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my_environment["SHARED"] = "1"
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if os.path.exists(os.path.join(git_worktree_path, "crypto")):
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my_environment["USE_CRYPTO_SUBMODULE"] = "1"
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make_output = subprocess.check_output(
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[self.make_command, "lib"],
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env=my_environment,
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cwd=git_worktree_path,
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stderr=subprocess.STDOUT
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)
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self.log.debug(make_output.decode("utf-8"))
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for root, _dirs, files in os.walk(git_worktree_path):
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for file in fnmatch.filter(files, "*.so"):
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version.modules[os.path.splitext(file)[0]] = (
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os.path.join(root, file)
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)
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@staticmethod
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def _pretty_revision(version):
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if version.revision == version.commit:
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return version.revision
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else:
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return "{} ({})".format(version.revision, version.commit)
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def _get_abi_dumps_from_shared_libraries(self, version):
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"""Generate the ABI dumps for the specified git revision.
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The shared libraries must have been built and the module paths
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present in version.modules."""
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for mbed_module, module_path in version.modules.items():
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output_path = os.path.join(
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self.report_dir, "{}-{}-{}.dump".format(
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mbed_module, version.revision, version.version
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)
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)
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abi_dump_command = [
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"abi-dumper",
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module_path,
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"-o", output_path,
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"-lver", self._pretty_revision(version),
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]
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abi_dump_output = subprocess.check_output(
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abi_dump_command,
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stderr=subprocess.STDOUT
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)
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self.log.debug(abi_dump_output.decode("utf-8"))
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version.abi_dumps[mbed_module] = output_path
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@staticmethod
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def _normalize_storage_test_case_data(line):
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"""Eliminate cosmetic or irrelevant details in storage format test cases."""
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line = re.sub(r'\s+', r'', line)
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return line
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def _read_storage_tests(self,
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directory,
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filename,
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is_generated,
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storage_tests):
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"""Record storage tests from the given file.
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Populate the storage_tests dictionary with test cases read from
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filename under directory.
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"""
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at_paragraph_start = True
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description = None
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full_path = os.path.join(directory, filename)
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with open(full_path) as fd:
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for line_number, line in enumerate(fd, 1):
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line = line.strip()
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if not line:
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at_paragraph_start = True
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continue
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if line.startswith('#'):
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continue
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if at_paragraph_start:
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description = line.strip()
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at_paragraph_start = False
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continue
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if line.startswith('depends_on:'):
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continue
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# We've reached a test case data line
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test_case_data = self._normalize_storage_test_case_data(line)
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if not is_generated:
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# In manual test data, only look at read tests.
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function_name = test_case_data.split(':', 1)[0]
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if 'read' not in function_name.split('_'):
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continue
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metadata = SimpleNamespace(
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filename=filename,
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line_number=line_number,
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description=description
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)
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storage_tests[test_case_data] = metadata
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@staticmethod
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def _list_generated_test_data_files(git_worktree_path):
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"""List the generated test data files."""
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output = subprocess.check_output(
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['tests/scripts/generate_psa_tests.py', '--list'],
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cwd=git_worktree_path,
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).decode('ascii')
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return [line for line in output.split('\n') if line]
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def _get_storage_format_tests(self, version, git_worktree_path):
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"""Record the storage format tests for the specified git version.
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The storage format tests are the test suite data files whose name
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contains "storage_format".
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The version must be checked out at git_worktree_path.
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This function creates or updates the generated data files.
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"""
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# Existing test data files. This may be missing some automatically
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# generated files if they haven't been generated yet.
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storage_data_files = set(glob.glob(
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'tests/suites/test_suite_*storage_format*.data'
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))
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# Discover and (re)generate automatically generated data files.
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to_be_generated = set()
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for filename in self._list_generated_test_data_files(git_worktree_path):
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if 'storage_format' in filename:
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storage_data_files.add(filename)
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to_be_generated.add(filename)
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subprocess.check_call(
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['tests/scripts/generate_psa_tests.py'] + sorted(to_be_generated),
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cwd=git_worktree_path,
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)
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for test_file in sorted(storage_data_files):
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self._read_storage_tests(git_worktree_path,
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test_file,
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test_file in to_be_generated,
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version.storage_tests)
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def _cleanup_worktree(self, git_worktree_path):
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"""Remove the specified git worktree."""
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shutil.rmtree(git_worktree_path)
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worktree_output = subprocess.check_output(
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[self.git_command, "worktree", "prune"],
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cwd=self.repo_path,
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stderr=subprocess.STDOUT
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)
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self.log.debug(worktree_output.decode("utf-8"))
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def _get_abi_dump_for_ref(self, version):
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"""Generate the interface information for the specified git revision."""
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git_worktree_path = self._get_clean_worktree_for_git_revision(version)
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self._update_git_submodules(git_worktree_path, version)
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if self.check_abi:
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self._build_shared_libraries(git_worktree_path, version)
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self._get_abi_dumps_from_shared_libraries(version)
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if self.check_storage_tests:
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self._get_storage_format_tests(version, git_worktree_path)
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self._cleanup_worktree(git_worktree_path)
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def _remove_children_with_tag(self, parent, tag):
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children = parent.getchildren()
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for child in children:
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if child.tag == tag:
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parent.remove(child)
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else:
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self._remove_children_with_tag(child, tag)
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def _remove_extra_detail_from_report(self, report_root):
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for tag in ['test_info', 'test_results', 'problem_summary',
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'added_symbols', 'affected']:
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self._remove_children_with_tag(report_root, tag)
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for report in report_root:
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for problems in report.getchildren()[:]:
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if not problems.getchildren():
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report.remove(problems)
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def _abi_compliance_command(self, mbed_module, output_path):
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"""Build the command to run to analyze the library mbed_module.
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The report will be placed in output_path."""
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abi_compliance_command = [
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"abi-compliance-checker",
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"-l", mbed_module,
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"-old", self.old_version.abi_dumps[mbed_module],
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"-new", self.new_version.abi_dumps[mbed_module],
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"-strict",
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"-report-path", output_path,
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]
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if self.skip_file:
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abi_compliance_command += ["-skip-symbols", self.skip_file,
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"-skip-types", self.skip_file]
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if self.brief:
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abi_compliance_command += ["-report-format", "xml",
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"-stdout"]
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return abi_compliance_command
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def _is_library_compatible(self, mbed_module, compatibility_report):
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"""Test if the library mbed_module has remained compatible.
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Append a message regarding compatibility to compatibility_report."""
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output_path = os.path.join(
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self.report_dir, "{}-{}-{}.html".format(
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mbed_module, self.old_version.revision,
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self.new_version.revision
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)
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)
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try:
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subprocess.check_output(
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self._abi_compliance_command(mbed_module, output_path),
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stderr=subprocess.STDOUT
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)
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except subprocess.CalledProcessError as err:
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if err.returncode != 1:
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raise err
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if self.brief:
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self.log.info(
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"Compatibility issues found for {}".format(mbed_module)
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)
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report_root = ET.fromstring(err.output.decode("utf-8"))
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self._remove_extra_detail_from_report(report_root)
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self.log.info(ET.tostring(report_root).decode("utf-8"))
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else:
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self.can_remove_report_dir = False
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compatibility_report.append(
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"Compatibility issues found for {}, "
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"for details see {}".format(mbed_module, output_path)
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)
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return False
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compatibility_report.append(
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"No compatibility issues for {}".format(mbed_module)
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)
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if not (self.keep_all_reports or self.brief):
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os.remove(output_path)
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return True
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|
@staticmethod
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def _is_storage_format_compatible(old_tests, new_tests,
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compatibility_report):
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"""Check whether all tests present in old_tests are also in new_tests.
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|
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|
Append a message regarding compatibility to compatibility_report.
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"""
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missing = frozenset(old_tests.keys()).difference(new_tests.keys())
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for test_data in sorted(missing):
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metadata = old_tests[test_data]
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compatibility_report.append(
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'Test case from {} line {} "{}" has disappeared: {}'.format(
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metadata.filename, metadata.line_number,
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metadata.description, test_data
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)
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)
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compatibility_report.append(
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'FAIL: {}/{} storage format test cases have changed or disappeared.'.format(
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len(missing), len(old_tests)
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) if missing else
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'PASS: All {} storage format test cases are preserved.'.format(
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len(old_tests)
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)
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)
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compatibility_report.append(
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'Info: number of storage format tests cases: {} -> {}.'.format(
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len(old_tests), len(new_tests)
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)
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)
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return not missing
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def get_abi_compatibility_report(self):
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"""Generate a report of the differences between the reference ABI
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and the new ABI. ABI dumps from self.old_version and self.new_version
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must be available."""
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compatibility_report = ["Checking evolution from {} to {}".format(
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self._pretty_revision(self.old_version),
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self._pretty_revision(self.new_version)
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)]
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compliance_return_code = 0
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if self.check_abi:
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shared_modules = list(set(self.old_version.modules.keys()) &
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set(self.new_version.modules.keys()))
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for mbed_module in shared_modules:
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if not self._is_library_compatible(mbed_module,
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compatibility_report):
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compliance_return_code = 1
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|
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if self.check_storage_tests:
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if not self._is_storage_format_compatible(
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self.old_version.storage_tests,
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self.new_version.storage_tests,
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compatibility_report):
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compliance_return_code = 1
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for version in [self.old_version, self.new_version]:
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for mbed_module, mbed_module_dump in version.abi_dumps.items():
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os.remove(mbed_module_dump)
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if self.can_remove_report_dir:
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os.rmdir(self.report_dir)
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self.log.info("\n".join(compatibility_report))
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return compliance_return_code
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def check_for_abi_changes(self):
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"""Generate a report of ABI differences
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|
between self.old_rev and self.new_rev."""
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self.check_repo_path()
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if self.check_api or self.check_abi:
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self.check_abi_tools_are_installed()
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self._get_abi_dump_for_ref(self.old_version)
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self._get_abi_dump_for_ref(self.new_version)
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return self.get_abi_compatibility_report()
|
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|
|
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def run_main():
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try:
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parser = argparse.ArgumentParser(
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|
description=__doc__
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)
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|
parser.add_argument(
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|
"-v", "--verbose", action="store_true",
|
|
help="set verbosity level",
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|
)
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parser.add_argument(
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|
"-r", "--report-dir", type=str, default="reports",
|
|
help="directory where reports are stored, default is reports",
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|
)
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parser.add_argument(
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|
"-k", "--keep-all-reports", action="store_true",
|
|
help="keep all reports, even if there are no compatibility issues",
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|
)
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|
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()
|