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#!/usr/bin/env python3

"""Check proposed changes for common issues."""

import sys

import os.path

import subprocess

import sysconfig

def get_python_source_dir():

src_dir = sysconfig.get_config_var('abs_srcdir')

if not src_dir:

src_dir = sysconfig.get_config_var('srcdir')

return os.path.abspath(src_dir)

SRCDIR = get_python_source_dir()

def n_files_str(count):

"""Return 'N file(s)' with the proper plurality on 'file'."""

s = "s" if count != 1 else ""

return f"{count} file{s}"

def status(message, modal=False, info=None):

"""Decorator to output status info to stdout."""

def decorated_fxn(fxn):

def call_fxn(*args, **kwargs):

sys.stdout.write(message + ' ... ')

sys.stdout.flush()

result = fxn(*args, **kwargs)

if not modal and not info:

print("done")

elif info:

print(info(result))

else:

print("yes" if result else "NO")

return result

return call_fxn

return decorated_fxn

def get_git_branch():

"""Get the symbolic name for the current git branch"""

cmd = "git rev-parse --abbrev-ref HEAD".split()

try:

return subprocess.check_output(cmd,

stderr=subprocess.DEVNULL,

cwd=SRCDIR,

encoding='UTF-8')

except subprocess.CalledProcessError:

return None

def get_git_upstream_remote():

"""

Get the remote name to use for upstream branches

Check for presence of "https://github.com/python/cpython" remote URL.

If only one is found, return that remote name. If multiple are found,

check for and return "upstream", "origin", or "python", in that

order. Raise an error if no valid matches are found.

"""

cmd = "git remote -v".split()

output = subprocess.check_output(

cmd,

stderr=subprocess.DEVNULL,

cwd=SRCDIR,

encoding="UTF-8"

)

# Filter to desired remotes, accounting for potential uppercasing

filtered_remotes = {

remote.split("\t")[0].lower() for remote in output.split('\n')

if "python/cpython" in remote.lower() and remote.endswith("(fetch)")

}

if len(filtered_remotes) == 1:

[remote] = filtered_remotes

return remote

for remote_name in ["upstream", "origin", "python"]:

if remote_name in filtered_remotes:

return remote_name

remotes_found = "\n".join(

{remote for remote in output.split('\n') if remote.endswith("(fetch)")}

)

raise ValueError(

f"Patchcheck was unable to find an unambiguous upstream remote, "

f"with URL matching 'https://github.com/python/cpython'. "

f"For help creating an upstream remote, see Dev Guide: "

f"https://devguide.python.org/getting-started/"

f"git-boot-camp/#cloning-a-forked-cpython-repository "

f"\nRemotes found: \n{remotes_found}"

)

def get_git_remote_default_branch(remote_name):

"""Get the name of the default branch for the given remote

It is typically called 'main', but may differ

"""

cmd = f"git remote show {remote_name}".split()

env = os.environ.copy()

env['LANG'] = 'C'

try:

remote_info = subprocess.check_output(cmd,

stderr=subprocess.DEVNULL,

cwd=SRCDIR,

encoding='UTF-8',

env=env)

except subprocess.CalledProcessError:

return None

for line in remote_info.splitlines():

if "HEAD branch:" in line:

base_branch = line.split(":")[1].strip()

return base_branch

return None

@status("Getting base branch for PR",

info=lambda x: x if x is not None else "not a PR branch")

def get_base_branch():

if not os.path.exists(os.path.join(SRCDIR, '.git')):

# Not a git checkout, so there's no base branch

return None

upstream_remote = get_git_upstream_remote()

version = sys.version_info

if version.releaselevel == 'alpha':

base_branch = get_git_remote_default_branch(upstream_remote)

else:

base_branch = "{0.major}.{0.minor}".format(version)

this_branch = get_git_branch()

if this_branch is None or this_branch == base_branch:

# Not on a git PR branch, so there's no base branch

return None

return upstream_remote + "/" + base_branch

@status("Getting the list of files that have been added/changed",

info=lambda x: n_files_str(len(x)))

def changed_files(base_branch=None):

"""Get the list of changed or added files from git."""

if os.path.exists(os.path.join(SRCDIR, '.git')):

# We just use an existence check here as:

# directory = normal git checkout/clone

# file = git worktree directory

if base_branch:

cmd = 'git diff --name-status ' + base_branch

else:

cmd = 'git status --porcelain'

filenames = []

with subprocess.Popen(cmd.split(),

stdout=subprocess.PIPE,

cwd=SRCDIR) as st:

git_file_status, _ = st.communicate()

if st.returncode != 0:

sys.exit(f'error running {cmd}')

for line in git_file_status.splitlines():

line = line.decode().rstrip()

status_text, filename = line.split(maxsplit=1)

status = set(status_text)

# modified, added or unmerged files

if not status.intersection('MAU'):

continue

if ' -> ' in filename:

# file is renamed

filename = filename.split(' -> ', 2)[1].strip()

filenames.append(filename)

else:

sys.exit('need a git checkout to get modified files')

return list(map(os.path.normpath, filenames))

@status("Docs modified", modal=True)

def docs_modified(file_paths):

"""Report if any file in the Doc directory has been changed."""

return bool(file_paths)

@status("Misc/NEWS.d updated with `blurb`", modal=True)

def reported_news(file_paths):

"""Check if Misc/NEWS.d has been changed."""

return any(p.startswith(os.path.join('Misc', 'NEWS.d', 'next'))

for p in file_paths)

@status("configure regenerated", modal=True, info=str)

def regenerated_configure(file_paths):

"""Check if configure has been regenerated."""

if 'configure.ac' in file_paths:

return "yes" if 'configure' in file_paths else "no"

else:

return "not needed"

@status("pyconfig.h.in regenerated", modal=True, info=str)

def regenerated_pyconfig_h_in(file_paths):

"""Check if pyconfig.h.in has been regenerated."""

if 'configure.ac' in file_paths:

return "yes" if 'pyconfig.h.in' in file_paths else "no"

else:

return "not needed"

def main():

base_branch = get_base_branch()

file_paths = changed_files(base_branch)

has_doc_files = any(fn for fn in file_paths if fn.startswith('Doc') and

fn.endswith(('.rst', '.inc')))

misc_files = {p for p in file_paths if p.startswith('Misc')}

# Docs updated.

docs_modified(has_doc_files)

# Misc/NEWS changed.

reported_news(misc_files)

# Regenerated configure, if necessary.

regenerated_configure(file_paths)

# Regenerated pyconfig.h.in, if necessary.

regenerated_pyconfig_h_in(file_paths)

# Test suite run and passed.

has_c_files = any(fn for fn in file_paths if fn.endswith(('.c', '.h')))

has_python_files = any(fn for fn in file_paths if fn.endswith('.py'))

print()

if has_c_files:

print("Did you run the test suite and check for refleaks?")

elif has_python_files:

print("Did you run the test suite?")

if __name__ == '__main__':

main()

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