6c3339402a
* Improve python 2/3 ABC fallback for pylint. * Allow longer method names in ansible-test.
521 lines
13 KiB
Python
521 lines
13 KiB
Python
"""Miscellaneous utility functions and classes."""
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from __future__ import absolute_import, print_function
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import errno
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import inspect
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import os
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import pipes
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import pkgutil
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import shutil
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import subprocess
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import re
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import sys
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import time
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try:
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from abc import ABC
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except ImportError:
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from abc import ABCMeta
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ABC = ABCMeta('ABC', (), {})
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def is_shippable():
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"""
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:rtype: bool
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"""
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return os.environ.get('SHIPPABLE') == 'true'
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def remove_file(path):
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"""
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:type path: str
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"""
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if os.path.isfile(path):
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os.remove(path)
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def find_executable(executable, cwd=None, path=None, required=True):
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"""
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:type executable: str
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:type cwd: str
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:type path: str
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:type required: bool | str
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:rtype: str | None
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"""
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match = None
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real_cwd = os.getcwd()
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if not cwd:
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cwd = real_cwd
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if os.path.dirname(executable):
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target = os.path.join(cwd, executable)
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if os.path.exists(target) and os.access(target, os.F_OK | os.X_OK):
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match = executable
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else:
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if path is None:
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path = os.environ.get('PATH', os.defpath)
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if path:
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path_dirs = path.split(os.pathsep)
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seen_dirs = set()
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for path_dir in path_dirs:
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if path_dir in seen_dirs:
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continue
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seen_dirs.add(path_dir)
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if os.path.abspath(path_dir) == real_cwd:
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path_dir = cwd
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candidate = os.path.join(path_dir, executable)
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if os.path.exists(candidate) and os.access(candidate, os.F_OK | os.X_OK):
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match = candidate
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break
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if not match and required:
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message = 'Required program "%s" not found.' % executable
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if required != 'warning':
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raise ApplicationError(message)
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display.warning(message)
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return match
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def run_command(args, cmd, capture=False, env=None, data=None, cwd=None, always=False, stdin=None, stdout=None,
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cmd_verbosity=1, str_errors='strict'):
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"""
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:type args: CommonConfig
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:type cmd: collections.Iterable[str]
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:type capture: bool
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:type env: dict[str, str] | None
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:type data: str | None
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:type cwd: str | None
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:type always: bool
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:type stdin: file | None
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:type stdout: file | None
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:type cmd_verbosity: int
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:type str_errors: str
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:rtype: str | None, str | None
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"""
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explain = args.explain and not always
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return raw_command(cmd, capture=capture, env=env, data=data, cwd=cwd, explain=explain, stdin=stdin, stdout=stdout,
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cmd_verbosity=cmd_verbosity, str_errors=str_errors)
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def raw_command(cmd, capture=False, env=None, data=None, cwd=None, explain=False, stdin=None, stdout=None,
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cmd_verbosity=1, str_errors='strict'):
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"""
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:type cmd: collections.Iterable[str]
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:type capture: bool
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:type env: dict[str, str] | None
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:type data: str | None
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:type cwd: str | None
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:type explain: bool
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:type stdin: file | None
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:type stdout: file | None
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:type cmd_verbosity: int
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:type str_errors: str
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:rtype: str | None, str | None
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"""
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if not cwd:
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cwd = os.getcwd()
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if not env:
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env = common_environment()
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cmd = list(cmd)
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escaped_cmd = ' '.join(pipes.quote(c) for c in cmd)
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display.info('Run command: %s' % escaped_cmd, verbosity=cmd_verbosity)
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display.info('Working directory: %s' % cwd, verbosity=2)
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program = find_executable(cmd[0], cwd=cwd, path=env['PATH'], required='warning')
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if program:
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display.info('Program found: %s' % program, verbosity=2)
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for key in sorted(env.keys()):
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display.info('%s=%s' % (key, env[key]), verbosity=2)
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if explain:
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return None, None
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communicate = False
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if stdin is not None:
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data = None
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communicate = True
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elif data is not None:
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stdin = subprocess.PIPE
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communicate = True
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if stdout:
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communicate = True
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if capture:
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stdout = stdout or subprocess.PIPE
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stderr = subprocess.PIPE
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communicate = True
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else:
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stderr = None
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start = time.time()
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try:
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process = subprocess.Popen(cmd, env=env, stdin=stdin, stdout=stdout, stderr=stderr, cwd=cwd)
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except OSError as ex:
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if ex.errno == errno.ENOENT:
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raise ApplicationError('Required program "%s" not found.' % cmd[0])
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raise
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if communicate:
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encoding = 'utf-8'
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data_bytes = data.encode(encoding) if data else None
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stdout_bytes, stderr_bytes = process.communicate(data_bytes)
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stdout_text = stdout_bytes.decode(encoding, str_errors) if stdout_bytes else u''
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stderr_text = stderr_bytes.decode(encoding, str_errors) if stderr_bytes else u''
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else:
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process.wait()
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stdout_text, stderr_text = None, None
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status = process.returncode
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runtime = time.time() - start
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display.info('Command exited with status %s after %s seconds.' % (status, runtime), verbosity=4)
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if status == 0:
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return stdout_text, stderr_text
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raise SubprocessError(cmd, status, stdout_text, stderr_text, runtime)
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def common_environment():
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"""Common environment used for executing all programs."""
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env = dict(
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LC_ALL='en_US.UTF-8',
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PATH=os.environ.get('PATH', os.defpath),
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)
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required = (
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'HOME',
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)
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optional = (
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'HTTPTESTER',
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'LD_LIBRARY_PATH',
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'SSH_AUTH_SOCK',
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# MacOS High Sierra Compatibility
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# http://sealiesoftware.com/blog/archive/2017/6/5/Objective-C_and_fork_in_macOS_1013.html
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'OBJC_DISABLE_INITIALIZE_FORK_SAFETY',
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)
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env.update(pass_vars(required=required, optional=optional))
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return env
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def pass_vars(required, optional):
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"""
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:type required: collections.Iterable[str]
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:type optional: collections.Iterable[str]
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:rtype: dict[str, str]
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"""
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env = {}
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for name in required:
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if name not in os.environ:
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raise MissingEnvironmentVariable(name)
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env[name] = os.environ[name]
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for name in optional:
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if name not in os.environ:
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continue
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env[name] = os.environ[name]
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return env
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def deepest_path(path_a, path_b):
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"""Return the deepest of two paths, or None if the paths are unrelated.
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:type path_a: str
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:type path_b: str
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:rtype: str | None
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"""
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if path_a == '.':
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path_a = ''
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if path_b == '.':
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path_b = ''
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if path_a.startswith(path_b):
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return path_a or '.'
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if path_b.startswith(path_a):
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return path_b or '.'
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return None
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def remove_tree(path):
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"""
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:type path: str
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"""
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try:
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shutil.rmtree(path)
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except OSError as ex:
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if ex.errno != errno.ENOENT:
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raise
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def make_dirs(path):
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"""
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:type path: str
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"""
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try:
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os.makedirs(path)
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except OSError as ex:
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if ex.errno != errno.EEXIST:
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raise
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def is_binary_file(path):
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"""
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:type path: str
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:rtype: bool
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"""
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with open(path, 'rb') as path_fd:
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return b'\0' in path_fd.read(1024)
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class Display(object):
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"""Manages color console output."""
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clear = '\033[0m'
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red = '\033[31m'
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green = '\033[32m'
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yellow = '\033[33m'
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blue = '\033[34m'
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purple = '\033[35m'
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cyan = '\033[36m'
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verbosity_colors = {
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0: None,
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1: green,
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2: blue,
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3: cyan,
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}
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def __init__(self):
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self.verbosity = 0
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self.color = True
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self.warnings = []
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self.warnings_unique = set()
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self.info_stderr = False
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def __warning(self, message):
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"""
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:type message: str
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"""
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self.print_message('WARNING: %s' % message, color=self.purple, fd=sys.stderr)
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def review_warnings(self):
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"""Review all warnings which previously occurred."""
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if not self.warnings:
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return
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self.__warning('Reviewing previous %d warning(s):' % len(self.warnings))
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for warning in self.warnings:
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self.__warning(warning)
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def warning(self, message, unique=False):
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"""
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:type message: str
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:type unique: bool
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"""
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if unique:
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if message in self.warnings_unique:
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return
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self.warnings_unique.add(message)
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self.__warning(message)
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self.warnings.append(message)
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def notice(self, message):
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"""
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:type message: str
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"""
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self.print_message('NOTICE: %s' % message, color=self.purple, fd=sys.stderr)
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def error(self, message):
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"""
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:type message: str
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"""
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self.print_message('ERROR: %s' % message, color=self.red, fd=sys.stderr)
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def info(self, message, verbosity=0):
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"""
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:type message: str
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:type verbosity: int
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"""
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if self.verbosity >= verbosity:
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color = self.verbosity_colors.get(verbosity, self.yellow)
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self.print_message(message, color=color, fd=sys.stderr if self.info_stderr else sys.stdout)
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def print_message(self, message, color=None, fd=sys.stdout): # pylint: disable=locally-disabled, invalid-name
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"""
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:type message: str
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:type color: str | None
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:type fd: file
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"""
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if color and self.color:
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# convert color resets in message to desired color
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message = message.replace(self.clear, color)
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message = '%s%s%s' % (color, message, self.clear)
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if sys.version_info[0] == 2 and isinstance(message, type(u'')):
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message = message.encode('utf-8')
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print(message, file=fd)
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fd.flush()
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class ApplicationError(Exception):
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"""General application error."""
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pass
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class ApplicationWarning(Exception):
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"""General application warning which interrupts normal program flow."""
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pass
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class SubprocessError(ApplicationError):
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"""Error resulting from failed subprocess execution."""
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def __init__(self, cmd, status=0, stdout=None, stderr=None, runtime=None):
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"""
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:type cmd: list[str]
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:type status: int
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:type stdout: str | None
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:type stderr: str | None
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:type runtime: float | None
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"""
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message = 'Command "%s" returned exit status %s.\n' % (' '.join(pipes.quote(c) for c in cmd), status)
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if stderr:
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message += '>>> Standard Error\n'
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message += '%s%s\n' % (stderr.strip(), Display.clear)
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if stdout:
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message += '>>> Standard Output\n'
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message += '%s%s\n' % (stdout.strip(), Display.clear)
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message = message.strip()
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super(SubprocessError, self).__init__(message)
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self.cmd = cmd
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self.status = status
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self.stdout = stdout
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self.stderr = stderr
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self.runtime = runtime
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class MissingEnvironmentVariable(ApplicationError):
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"""Error caused by missing environment variable."""
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def __init__(self, name):
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"""
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:type name: str
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"""
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super(MissingEnvironmentVariable, self).__init__('Missing environment variable: %s' % name)
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self.name = name
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class CommonConfig(object):
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"""Configuration common to all commands."""
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def __init__(self, args):
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"""
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:type args: any
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"""
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self.color = args.color # type: bool
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self.explain = args.explain # type: bool
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self.verbosity = args.verbosity # type: int
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self.debug = args.debug # type: bool
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def docker_qualify_image(name):
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"""
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:type name: str
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:rtype: str
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"""
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if not name or any((c in name) for c in ('/', ':')):
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return name
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return 'ansible/ansible:%s' % name
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def parse_to_dict(pattern, value):
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"""
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:type pattern: str
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:type value: str
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:return: dict[str, str]
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"""
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match = re.search(pattern, value)
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if match is None:
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raise Exception('Pattern "%s" did not match value: %s' % (pattern, value))
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return match.groupdict()
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def get_subclasses(class_type):
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"""
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:type class_type: type
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:rtype: set[str]
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"""
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subclasses = set()
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queue = [class_type]
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while queue:
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parent = queue.pop()
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for child in parent.__subclasses__():
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if child not in subclasses:
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if not inspect.isabstract(child):
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subclasses.add(child)
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queue.append(child)
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return subclasses
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def import_plugins(directory):
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"""
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:type directory: str
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"""
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path = os.path.join(os.path.dirname(__file__), directory)
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prefix = 'lib.%s.' % directory
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for (_, name, _) in pkgutil.iter_modules([path], prefix=prefix):
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__import__(name)
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def load_plugins(base_type, database):
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"""
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:type base_type: type
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:type database: dict[str, type]
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"""
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plugins = dict((sc.__module__.split('.')[2], sc) for sc in get_subclasses(base_type)) # type: dict [str, type]
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for plugin in plugins:
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database[plugin] = plugins[plugin]
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display = Display() # pylint: disable=locally-disabled, invalid-name
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