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import contextlib, subprocess, tempfile, shutil, re, os
class UserError(Exception):
def __init__(self, message, *args):
super(UserError, self).__init__(message.format(*args))
def rename_atomic(source_path, target_path):
"""
Move the file at source_path to target_path.
If both paths reside on the same device, os.rename() is used, otherwise the file is copied to a temporary name next to target_path and moved from there using os.rename().
"""
source_dir_stat = os.stat(os.path.dirname(source_path))
target_dir_stat = os.stat(os.path.dirname(target_path))
if source_dir_stat.st_dev == target_dir_stat.st_dev:
os.rename(source_path, target_path)
else:
temp_path = target_path + '~'
shutil.copyfile(source_path, temp_path)
os.rename(temp_path, target_path)
@contextlib.contextmanager
def TemporaryDirectory():
dir = tempfile.mkdtemp()
try:
yield dir
finally:
shutil.rmtree(dir)
def command(args, remove_env = [], set_env = { }):
env = dict(os.environ)
for i in remove_env:
del env[i]
for k, v in set_env.items():
env[k] = v
try:
process = subprocess.Popen(args, env = env)
process.wait()
except OSError as e:
raise UserError('Error running {}: {}', args[0], e)
if process.returncode:
raise UserError('Command failed: {}', ' '.join(args))
def bash_escape_string(string):
return "'{}'".format(re.sub("'", "'\"'\"'", string))
def write_file(path, data):
temp_path = path + '~'
with open(temp_path, 'wb') as file:
file.write(data)
os.rename(temp_path, path)
def read_file(path):
with open(path, 'rb') as file:
return file.read()
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