pre-commit/pre_commit/util.py at wip_progress_dots · pre-commit/pre-commit · GitHub

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from __future__ import unicode_literals

import contextlib

import errno

import os.path

import shutil

import stat

import subprocess

import sys

import tempfile

import six

from pre_commit import five

from pre_commit import parse_shebang

if sys.version_info >= (3, 7): # pragma: no cover (PY37+)

from importlib.resources import open_binary

from importlib.resources import read_text

else: # pragma: no cover (<PY37)

from importlib_resources import open_binary

from importlib_resources import read_text

def mkdirp(path):

try:

os.makedirs(path)

except OSError:

if not os.path.exists(path):

raise

@contextlib.contextmanager

def clean_path_on_failure(path):

"""Cleans up the directory on an exceptional failure."""

try:

yield

except BaseException:

if os.path.exists(path):

rmtree(path)

raise

@contextlib.contextmanager

def noop_context():

yield

@contextlib.contextmanager

def tmpdir():

"""Contextmanager to create a temporary directory. It will be cleaned up

afterwards.

"""

tempdir = tempfile.mkdtemp()

try:

yield tempdir

finally:

rmtree(tempdir)

def resource_bytesio(filename):

return open_binary('pre_commit.resources', filename)

def resource_text(filename):

return read_text('pre_commit.resources', filename)

def make_executable(filename):

original_mode = os.stat(filename).st_mode

os.chmod(

filename, original_mode | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH,

)

class CalledProcessError(RuntimeError):

def __init__(self, returncode, cmd, expected_returncode, output=None):

super(CalledProcessError, self).__init__(

returncode, cmd, expected_returncode, output,

)

self.returncode = returncode

self.cmd = cmd

self.expected_returncode = expected_returncode

self.output = output

def to_bytes(self):

output = []

for maybe_text in self.output:

if maybe_text:

output.append(

b'\n ' +

five.to_bytes(maybe_text).replace(b'\n', b'\n '),

)

else:

output.append(b'(none)')

return b''.join((

five.to_bytes(

'Command: {!r}\n'

'Return code: {}\n'

'Expected return code: {}\n'.format(

self.cmd, self.returncode, self.expected_returncode,

b'Output: ', output[0], b'\n',

b'Errors: ', output[1],

))

def to_text(self):

return self.to_bytes().decode('UTF-8')

if six.PY2: # pragma: no cover (py2)

__str__ = to_bytes

__unicode__ = to_text

else: # pragma: no cover (py3)

__bytes__ = to_bytes

__str__ = to_text

def _cmd_kwargs(*cmd, **kwargs):

# py2/py3 on windows are more strict about the types here

cmd = tuple(five.n(arg) for arg in cmd)

kwargs['env'] = {

five.n(key): five.n(value)

for key, value in kwargs.pop('env', {}).items()

} or None

for arg in ('stdin', 'stdout', 'stderr'):

kwargs.setdefault(arg, subprocess.PIPE)

return cmd, kwargs

def cmd_output_b(*cmd, **kwargs):

retcode = kwargs.pop('retcode', 0)

cmd, kwargs = _cmd_kwargs(*cmd, **kwargs)

try:

cmd = parse_shebang.normalize_cmd(cmd)

except parse_shebang.ExecutableNotFoundError as e:

returncode, stdout_b, stderr_b = e.to_output()

else:

proc = subprocess.Popen(cmd, **kwargs)

stdout_b, stderr_b = proc.communicate()

returncode = proc.returncode

if retcode is not None and retcode != returncode:

raise CalledProcessError(

returncode, cmd, retcode, output=(stdout_b, stderr_b),

)

return returncode, stdout_b, stderr_b

def cmd_output(*cmd, **kwargs):

returncode, stdout_b, stderr_b = cmd_output_b(*cmd, **kwargs)

stdout = stdout_b.decode('UTF-8') if stdout_b is not None else None

stderr = stderr_b.decode('UTF-8') if stderr_b is not None else None

return returncode, stdout, stderr

if os.name != 'nt': # pragma: windows no cover

from os import openpty

import termios

class Pty(object):

def __init__(self):

self.r = self.w = None

def __enter__(self):

self.r, self.w = openpty()

# tty flags normally change \n to \r\n

attrs = termios.tcgetattr(self.r)

attrs[1] &= ~(termios.ONLCR | termios.OPOST)

termios.tcsetattr(self.r, termios.TCSANOW, attrs)

return self

def close_w(self):

if self.w is not None:

os.close(self.w)

self.w = None

def close_r(self):

assert self.r is not None

os.close(self.r)

self.r = None

def __exit__(self, exc_type, exc_value, traceback):

self.close_w()

self.close_r()

def cmd_output_p(*cmd, **kwargs):

assert kwargs.pop('retcode') is None

assert kwargs['stderr'] == subprocess.STDOUT, kwargs['stderr']

cmd, kwargs = _cmd_kwargs(*cmd, **kwargs)

try:

cmd = parse_shebang.normalize_cmd(cmd)

except parse_shebang.ExecutableNotFoundError as e:

return e.to_output()

with open(os.devnull) as devnull, Pty() as pty:

kwargs.update({'stdin': devnull, 'stdout': pty.w, 'stderr': pty.w})

proc = subprocess.Popen(cmd, **kwargs)

pty.close_w()

buf = b''

while True:

try:

bts = os.read(pty.r, 4096)

except OSError as e:

if e.errno == errno.EIO:

bts = b''

else:

raise

else:

buf += bts

if not bts:

break

return proc.wait(), buf, None

else: # pragma: no cover

cmd_output_p = cmd_output_b

def rmtree(path):

"""On windows, rmtree fails for readonly dirs."""

def handle_remove_readonly(func, path, exc):

excvalue = exc[1]

if (

func in (os.rmdir, os.remove, os.unlink) and

excvalue.errno == errno.EACCES

for p in (path, os.path.dirname(path)):

os.chmod(p, os.stat(p).st_mode | stat.S_IWUSR)

func(path)

else:

raise

shutil.rmtree(path, ignore_errors=False, onerror=handle_remove_readonly)

def parse_version(s):

"""poor man's version comparison"""

return tuple(int(p) for p in s.split('.'))

pre-commit/pre_commit/util.py at wip_progress_dots · pre-commit/pre-commit · GitHub

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