mirror of
https://github.com/crystalidea/qt6windows7.git
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398 lines
15 KiB
Python
398 lines
15 KiB
Python
#!/usr/bin/env python3
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# Copyright (C) 2019 The Qt Company Ltd.
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# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
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"""
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This is a helper script that takes care of reapplying special case
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modifications when regenerating a CMakeLists.txt file using
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pro2cmake.py or configure.cmake with configurejson2cmake.py.
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It has two modes of operation:
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1) Dumb "special case" block removal and re-application.
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2) Smart "special case" diff application, using a previously generated
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"clean" CMakeLists.txt/configure.cmake as a source. "clean" in this
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case means a generated file which has no "special case" modifications.
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Both modes use a temporary git repository to compute and reapply
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"special case" diffs.
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For the first mode to work, the developer has to mark changes
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with "# special case" markers on every line they want to keep. Or
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enclose blocks of code they want to keep between "# special case begin"
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and "# special case end" markers.
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For example:
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SOURCES
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foo.cpp
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bar.cpp # special case
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SOURCES
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foo1.cpp
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foo2.cpp
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# special case begin
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foo3.cpp
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foo4.cpp
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# special case end
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The second mode, as mentioned, requires a previous "clean"
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CMakeLists.txt/configure.cmake file.
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The script can then compute the exact diff between
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a "clean" and "modified" (with special cases) file, and reapply that
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diff to a newly generated "CMakeLists.txt"/"configure.cmake" file.
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This implies that we always have to keep a "clean" file alongside the
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"modified" project file for each project (corelib, gui, etc.) So we
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have to commit both files to the repository.
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If there is no such "clean" file, we can use the first operation mode
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to generate one. After that, we only have to use the second operation
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mode for the project file in question.
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When the script is used, the developer only has to take care of fixing
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the newly generated "modified" file. The "clean" file is automatically
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handled and git add'ed by the script, and will be committed together
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with the "modified" file.
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"""
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import re
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import os
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import subprocess
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import filecmp
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import time
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import typing
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import stat
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from shutil import copyfile
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from shutil import rmtree
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from textwrap import dedent
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def remove_special_cases(original: str) -> str:
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# Remove content between the following markers
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# '# special case begin' and '# special case end'.
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# This also remove the markers.
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replaced = re.sub(
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r"\n[^#\n]*?#[^\n]*?special case begin.*?#[^\n]*special case end[^\n]*?\n",
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"\n",
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original,
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0,
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re.DOTALL,
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)
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# Remove individual lines that have the "# special case" marker.
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replaced = re.sub(r"\n.*#.*special case[^\n]*\n", "\n", replaced)
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return replaced
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def read_content_from_file(file_path: str) -> str:
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with open(file_path, "r") as file_fd:
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content = file_fd.read()
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return content
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def write_content_to_file(file_path: str, content: str) -> None:
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with open(file_path, "w") as file_fd:
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file_fd.write(content)
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def resolve_simple_git_conflicts(file_path: str, debug=False) -> None:
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content = read_content_from_file(file_path)
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# If the conflict represents the addition of a new content hunk,
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# keep the content and remove the conflict markers.
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if debug:
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print("Resolving simple conflicts automatically.")
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replaced = re.sub(r"\n<<<<<<< HEAD\n=======(.+?)>>>>>>> master\n", r"\1", content, 0, re.DOTALL)
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write_content_to_file(file_path, replaced)
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def copyfile_log(src: str, dst: str, debug=False):
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if debug:
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print(f"Copying {src} to {dst}.")
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copyfile(src, dst)
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def check_if_git_in_path() -> bool:
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is_win = os.name == "nt"
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for path in os.environ["PATH"].split(os.pathsep):
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git_path = os.path.join(path, "git")
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if is_win:
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git_path += ".exe"
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if os.path.isfile(git_path) and os.access(git_path, os.X_OK):
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return True
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return False
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def run_process_quiet(args_string: str, debug=False) -> bool:
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if debug:
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print(f'Running command: "{args_string}"')
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args_list = args_string.split()
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try:
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subprocess.run(args_list, check=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
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except subprocess.CalledProcessError as e:
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# git merge with conflicts returns with exit code 1, but that's not
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# an error for us.
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if "git merge" not in args_string:
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if debug:
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print(
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dedent(
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f"""\
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Error while running: "{args_string}"
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{e.stdout}"""
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)
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)
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return False
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return True
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def does_file_have_conflict_markers(file_path: str, debug=False) -> bool:
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if debug:
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print(f"Checking if {file_path} has no leftover conflict markers.")
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content_actual = read_content_from_file(file_path)
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if "<<<<<<< HEAD" in content_actual:
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print(f"Conflict markers found in {file_path}. " "Please remove or solve them first.")
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return True
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return False
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def create_file_with_no_special_cases(
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original_file_path: str, no_special_cases_file_path: str, debug=False
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):
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"""
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Reads content of original CMakeLists.txt/configure.cmake, removes all content
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between "# special case" markers or lines, saves the result into a
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new file.
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"""
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content_actual = read_content_from_file(original_file_path)
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if debug:
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print(f"Removing special case blocks from {original_file_path}.")
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content_no_special_cases = remove_special_cases(content_actual)
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if debug:
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print(
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f"Saving original contents of {original_file_path} "
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f"with removed special case blocks to {no_special_cases_file_path}"
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)
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write_content_to_file(no_special_cases_file_path, content_no_special_cases)
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def rm_tree_on_error_handler(func: typing.Callable[..., None], path: str, exception_info: tuple):
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# If the path is read only, try to make it writable, and try
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# to remove the path again.
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if not os.access(path, os.W_OK):
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os.chmod(path, stat.S_IWRITE)
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func(path)
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else:
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print(f"Error while trying to remove path: {path}. Exception: {exception_info}")
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class SpecialCaseHandler(object):
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def __init__(
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self,
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original_file_path: str,
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generated_file_path: str,
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base_dir: str,
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keep_temporary_files=False,
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debug=False,
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) -> None:
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self.base_dir = base_dir
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self.original_file_path = original_file_path
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self.generated_file_path = generated_file_path
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self.keep_temporary_files = keep_temporary_files
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self.use_heuristic = False
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self.debug = debug
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@property
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def prev_file_path(self) -> str:
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filename = ".prev_" + os.path.basename(self.original_file_path)
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return os.path.join(self.base_dir, filename)
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@property
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def post_merge_file_path(self) -> str:
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original_file_name = os.path.basename(self.original_file_path)
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(original_file_basename, original_file_ext) = os.path.splitext(original_file_name)
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filename = original_file_basename + "-post-merge" + original_file_ext
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return os.path.join(self.base_dir, filename)
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@property
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def no_special_file_path(self) -> str:
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original_file_name = os.path.basename(self.original_file_path)
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(original_file_basename, original_file_ext) = os.path.splitext(original_file_name)
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filename = original_file_basename + ".no-special" + original_file_ext
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return os.path.join(self.base_dir, filename)
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def apply_git_merge_magic(self, no_special_cases_file_path: str) -> None:
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# Create new folder for temporary repo, and ch dir into it.
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repo = os.path.join(self.base_dir, "tmp_repo")
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repo_absolute_path = os.path.abspath(repo)
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txt = os.path.basename(self.original_file_path)
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try:
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os.mkdir(repo)
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current_dir = os.getcwd()
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os.chdir(repo)
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except Exception as e:
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print(f"Failed to create temporary directory for temporary git repo. Exception: {e}")
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raise e
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generated_file_path = os.path.join("..", self.generated_file_path)
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original_file_path = os.path.join("..", self.original_file_path)
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no_special_cases_file_path = os.path.join("..", no_special_cases_file_path)
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post_merge_file_path = os.path.join("..", self.post_merge_file_path)
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try:
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# Create new repo with the "clean" CMakeLists.txt/configure.cmake file.
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run_process_quiet("git init .", debug=self.debug)
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run_process_quiet("git config user.name fake", debug=self.debug)
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run_process_quiet("git config user.email fake@fake", debug=self.debug)
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copyfile_log(no_special_cases_file_path, txt, debug=self.debug)
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run_process_quiet(f"git add {txt}", debug=self.debug)
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run_process_quiet("git commit -m no_special", debug=self.debug)
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run_process_quiet("git checkout -b no_special", debug=self.debug)
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# Copy the original "modified" file (with the special cases)
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# and make a new commit.
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run_process_quiet("git checkout -b original", debug=self.debug)
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copyfile_log(original_file_path, txt, debug=self.debug)
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run_process_quiet(f"git add {txt}", debug=self.debug)
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run_process_quiet("git commit -m original", debug=self.debug)
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# Checkout the commit with "clean" file again, and create a
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# new branch.
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run_process_quiet("git checkout no_special", debug=self.debug)
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run_process_quiet("git checkout -b newly_generated", debug=self.debug)
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# Copy the new "modified" file and make a commit.
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copyfile_log(generated_file_path, txt, debug=self.debug)
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run_process_quiet(f"git add {txt}", debug=self.debug)
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run_process_quiet("git commit -m newly_generated", debug=self.debug)
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# Merge the "old" branch with modifications into the "new"
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# branch with the newly generated file.
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run_process_quiet("git merge original", debug=self.debug)
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# Resolve some simple conflicts (just remove the markers)
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# for cases that don't need intervention.
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resolve_simple_git_conflicts(txt, debug=self.debug)
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# Copy the resulting file from the merge.
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copyfile_log(txt, post_merge_file_path)
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except Exception as e:
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print(f"Git merge conflict resolution process failed. Exception: {e}")
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raise e
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finally:
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os.chdir(current_dir)
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# Remove the temporary repo.
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try:
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if not self.keep_temporary_files:
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rmtree(repo_absolute_path, onerror=rm_tree_on_error_handler)
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except Exception as e:
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print(f"Error removing temporary repo. Exception: {e}")
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def save_next_clean_file(self):
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files_are_equivalent = filecmp.cmp(self.generated_file_path, self.post_merge_file_path)
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if not files_are_equivalent:
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# Before overriding the generated file with the post
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# merge result, save the new "clean" file for future
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# regenerations.
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copyfile_log(self.generated_file_path, self.prev_file_path, debug=self.debug)
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# Attempt to git add until we succeed. It can fail when
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# run_pro2cmake executes pro2cmake in multiple threads, and git
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# has acquired the index lock.
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success = False
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failed_once = False
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i = 0
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while not success and i < 20:
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success = run_process_quiet(f"git add {self.prev_file_path}", debug=self.debug)
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if not success:
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failed_once = True
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i += 1
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time.sleep(0.1)
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if failed_once and not success:
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if self.debug:
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print("Retrying git add, the index.lock was probably acquired.")
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if failed_once and success:
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if self.debug:
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print("git add succeeded.")
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elif failed_once and not success:
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print(f"git add failed. Make sure to git add {self.prev_file_path} yourself.")
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def handle_special_cases_helper(self) -> bool:
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"""
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Uses git to reapply special case modifications to the "new"
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generated CMakeLists.gen.txt/configure.cmake.gen file.
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If use_heuristic is True, a new file is created from the
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original file, with special cases removed.
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If use_heuristic is False, an existing "clean" file with no
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special cases is used from a previous conversion. The "clean"
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file is expected to be in the same folder as the original one.
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"""
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try:
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if does_file_have_conflict_markers(self.original_file_path):
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return False
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if self.use_heuristic:
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create_file_with_no_special_cases(
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self.original_file_path, self.no_special_file_path
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)
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no_special_cases_file_path = self.no_special_file_path
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else:
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no_special_cases_file_path = self.prev_file_path
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if self.debug:
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print(
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f"Using git to reapply special case modifications to newly "
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f"generated {self.generated_file_path} file"
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)
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self.apply_git_merge_magic(no_special_cases_file_path)
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self.save_next_clean_file()
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copyfile_log(self.post_merge_file_path, self.generated_file_path)
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if not self.keep_temporary_files:
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os.remove(self.post_merge_file_path)
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if self.debug:
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print(
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"Special case reapplication using git is complete. "
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"Make sure to fix remaining conflict markers."
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)
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except Exception as e:
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print(f"Error occurred while trying to reapply special case modifications: {e}")
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return False
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finally:
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if not self.keep_temporary_files and self.use_heuristic:
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os.remove(self.no_special_file_path)
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return True
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def handle_special_cases(self) -> bool:
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original_file_exists = os.path.isfile(self.original_file_path)
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prev_file_exists = os.path.isfile(self.prev_file_path)
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self.use_heuristic = not prev_file_exists
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git_available = check_if_git_in_path()
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keep_special_cases = original_file_exists and git_available
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if not git_available:
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print(
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"You need to have git in PATH in order to reapply the special "
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"case modifications."
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)
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copy_generated_file = True
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if keep_special_cases:
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copy_generated_file = self.handle_special_cases_helper()
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return copy_generated_file
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