import builtins import ctypes import json import os import shutil import sys import tempfile import unittest.mock as mock from shutil import rmtree import pytest import yaml import dotbot.cli def get_long_path(path): """Get the long path for a given path.""" # Do nothing for non-Windows platforms. if sys.platform[:5] != "win32": return path buffer_size = 1000 buffer = ctypes.create_unicode_buffer(buffer_size) get_long_path_name = ctypes.windll.kernel32.GetLongPathNameW get_long_path_name(path, buffer, buffer_size) return buffer.value # On Linux, tempfile.TemporaryFile() requires unlink access. # This list is updated by a tempfile._mkstemp_inner() wrapper, # and its contents are checked by wrapped functions. allowed_tempfile_internal_unlink_calls = [] def wrap_function(function, function_path, arg_index, kwarg_key, root): def wrapper(*args, **kwargs): if kwarg_key in kwargs: value = kwargs[kwarg_key] else: value = args[arg_index] # Allow tempfile.TemporaryFile's internal unlink calls to work. if value in allowed_tempfile_internal_unlink_calls: return function(*args, **kwargs) msg = "The '{0}' argument to {1}() must be an absolute path" msg = msg.format(kwarg_key, function_path) assert value == os.path.abspath(value), msg msg = "The '{0}' argument to {1}() must be rooted in {2}" msg = msg.format(kwarg_key, function_path, root) assert value[: len(str(root))] == str(root), msg return function(*args, **kwargs) return wrapper def wrap_open(root): wrapped = getattr(builtins, "open") def wrapper(*args, **kwargs): if "file" in kwargs: value = kwargs["file"] else: value = args[0] mode = "r" if "mode" in kwargs: mode = kwargs["mode"] elif len(args) >= 2: mode = args[1] msg = "The 'file' argument to open() must be an absolute path" if value != os.devnull and "w" in mode: assert value == os.path.abspath(value), msg msg = "The 'file' argument to open() must be rooted in {0}" msg = msg.format(root) if value != os.devnull and "w" in mode: assert value[: len(str(root))] == str(root), msg return wrapped(*args, **kwargs) return wrapper def rmtree_error_handler(_, path, __): # Handle read-only files and directories. os.chmod(path, 0o777) if os.path.isdir(path): rmtree(path) else: os.unlink(path) @pytest.fixture(autouse=True, scope="session") def standardize_tmp(): r"""Standardize the temporary directory path. On MacOS, `/var` is a symlink to `/private/var`. This creates issues with link canonicalization and relative link tests, so this fixture rewrites environment variables and Python variables to ensure the tests work the same as on Linux and Windows. On Windows in GitHub CI, the temporary directory may be a short path. For example, `C:\Users\RUNNER~1\...` instead of `C:\Users\runneradmin\...`. This causes string-based path comparisons to fail. """ tmp = tempfile.gettempdir() # MacOS: `/var` is a symlink. tmp = os.path.abspath(os.path.realpath(tmp)) # Windows: The temporary directory may be a short path. if sys.platform[:5] == "win32": tmp = get_long_path(tmp) os.environ["TMP"] = tmp os.environ["TEMP"] = tmp os.environ["TMPDIR"] = tmp tempfile.tempdir = tmp yield @pytest.fixture(autouse=True) def root(standardize_tmp): """Create a temporary directory for the duration of each test.""" # Reset allowed_tempfile_internal_unlink_calls. global allowed_tempfile_internal_unlink_calls allowed_tempfile_internal_unlink_calls = [] # Dotbot changes the current working directory, # so this must be reset at the end of each test. current_working_directory = os.getcwd() # Create an isolated temporary directory from which to operate. current_root = tempfile.mkdtemp() functions_to_wrap = [ (os, "chflags", 0, "path"), (os, "chmod", 0, "path"), (os, "chown", 0, "path"), (os, "copy_file_range", 1, "dst"), (os, "lchflags", 0, "path"), (os, "lchmod", 0, "path"), (os, "link", 1, "dst"), (os, "makedirs", 0, "name"), (os, "mkdir", 0, "path"), (os, "mkfifo", 0, "path"), (os, "mknod", 0, "path"), (os, "remove", 0, "path"), (os, "removedirs", 0, "name"), (os, "removexattr", 0, "path"), (os, "rename", 0, "src"), # Check both (os, "rename", 1, "dst"), (os, "renames", 0, "old"), # Check both (os, "renames", 1, "new"), (os, "replace", 0, "src"), # Check both (os, "replace", 1, "dst"), (os, "rmdir", 0, "path"), (os, "setxattr", 0, "path"), (os, "splice", 1, "dst"), (os, "symlink", 1, "dst"), (os, "truncate", 0, "path"), (os, "unlink", 0, "path"), (os, "utime", 0, "path"), (shutil, "chown", 0, "path"), (shutil, "copy", 1, "dst"), (shutil, "copy2", 1, "dst"), (shutil, "copyfile", 1, "dst"), (shutil, "copymode", 1, "dst"), (shutil, "copystat", 1, "dst"), (shutil, "copytree", 1, "dst"), (shutil, "make_archive", 0, "base_name"), (shutil, "move", 0, "src"), # Check both (shutil, "move", 1, "dst"), (shutil, "rmtree", 0, "path"), (shutil, "unpack_archive", 1, "extract_dir"), ] patches = [] for module, function_name, arg_index, kwarg_key in functions_to_wrap: # Skip anything that doesn't exist in this version of Python. if not hasattr(module, function_name): continue # These values must be passed to a separate function # to ensure the variable closures work correctly. function_path = "{0}.{1}".format(module.__name__, function_name) function = getattr(module, function_name) wrapped = wrap_function(function, function_path, arg_index, kwarg_key, current_root) patches.append(mock.patch(function_path, wrapped)) # open() must be separately wrapped. function_path = "builtins.open" wrapped = wrap_open(current_root) patches.append(mock.patch(function_path, wrapped)) # Block all access to bad functions. if hasattr(os, "chroot"): patches.append(mock.patch("os.chroot", lambda *_, **__: None)) # Patch tempfile._mkstemp_inner() so tempfile.TemporaryFile() # can unlink files immediately. mkstemp_inner = tempfile._mkstemp_inner def wrap_mkstemp_inner(*args, **kwargs): (fd, name) = mkstemp_inner(*args, **kwargs) allowed_tempfile_internal_unlink_calls.append(name) return fd, name patches.append(mock.patch("tempfile._mkstemp_inner", wrap_mkstemp_inner)) [patch.start() for patch in patches] try: yield current_root finally: [patch.stop() for patch in patches] os.chdir(current_working_directory) rmtree(current_root, onerror=rmtree_error_handler) @pytest.fixture def home(monkeypatch, root): """Create a home directory for the duration of the test. On *nix, the environment variable "HOME" will be mocked. On Windows, the environment variable "USERPROFILE" will be mocked. """ home = os.path.abspath(os.path.join(root, "home/user")) os.makedirs(home) if sys.platform[:5] == "win32": monkeypatch.setenv("USERPROFILE", home) else: monkeypatch.setenv("HOME", home) yield home class Dotfiles: """Create and manage a dotfiles directory for a test.""" def __init__(self, root): self.root = root self.config = None self.config_filename = None self.directory = os.path.join(root, "dotfiles") os.mkdir(self.directory) def makedirs(self, path): os.makedirs(os.path.abspath(os.path.join(self.directory, path))) def write(self, path, content=""): path = os.path.abspath(os.path.join(self.directory, path)) if not os.path.exists(os.path.dirname(path)): os.makedirs(os.path.dirname(path)) with open(path, "w") as file: file.write(content) def write_config(self, config, serializer="yaml", path=None): """Write a dotbot config and return the filename.""" assert serializer in {"json", "yaml"}, "Only json and yaml are supported" if serializer == "yaml": serialize = yaml.dump else: # serializer == "json" serialize = json.dumps if path: msg = "The config file path must be an absolute path" assert path == os.path.abspath(path), msg msg = "The config file path must be rooted in {0}" msg = msg.format(root) assert path[: len(str(root))] == str(root), msg self.config_filename = path else: self.config_filename = os.path.join(self.directory, "install.conf.yaml") self.config = config with open(self.config_filename, "w") as file: file.write(serialize(config)) return self.config_filename @pytest.fixture def dotfiles(root): """Create a dotfiles directory.""" yield Dotfiles(root) @pytest.fixture def run_dotbot(dotfiles): """Run dotbot. When calling `runner()`, only CLI arguments need to be specified. If the keyword-only argument *custom* is True then the CLI arguments will not be modified, and the caller will be responsible for all CLI arguments. """ def runner(*argv, **kwargs): argv = ["dotbot"] + list(argv) if kwargs.get("custom", False) is not True: argv.extend(["-c", dotfiles.config_filename]) with mock.patch("sys.argv", argv): dotbot.cli.main() yield runner