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744 | @dataclass
class Worker:
"""Copier process state manager.
This class represents the state of a copier work, and contains methods to
actually produce the desired work.
To use it properly, instantiate it by filling properly all dataclass fields.
Then, execute one of its main methods, which are prefixed with `run_`:
- [run_copy][copier.main.Worker.run_copy] to copy a subproject.
- [run_update][copier.main.Worker.run_update] to update a subproject.
- [run_auto][copier.main.Worker.run_auto] to let it choose whether you
want to copy or update the subproject.
Attributes:
src_path:
String that can be resolved to a template path, be it local or remote.
See [copier.vcs.get_repo][].
If it is `None`, then it means that you are
[updating a project][updating-a-project], and the original
`src_path` will be obtained from
[the answers file][the-copier-answersyml-file].
dst_path:
Destination path where to render the subproject.
answers_file:
Indicates the path for [the answers file][the-copier-answersyml-file].
The path must be relative to `dst_path`.
If it is `None`, the default value will be obtained from
[copier.template.Template.answers_relpath][].
vcs_ref:
Specify the VCS tag/commit to use in the template.
data:
Answers to the questionary defined in the template.
exclude:
User-chosen additional [file exclusion patterns][exclude].
use_prereleases:
Consider prereleases when detecting the *latest* one?
See [use_prereleases][].
Useless if specifying a [vcs_ref][].
skip_if_exists:
User-chosen additional [file skip patterns][skip_if_exists].
cleanup_on_error:
Delete `dst_path` if there's an error?
See [cleanup_on_error][].
defaults:
When `True`, use default answers to questions, which might be null if not specified.
See [defaults][].
user_defaults:
Specify user defaults that may override a template's defaults during question prompts.
overwrite:
When `True`, Overwrite files that already exist, without asking.
See [overwrite][].
pretend:
When `True`, produce no real rendering.
See [pretend][].
quiet:
When `True`, disable all output.
See [quiet][].
"""
src_path: Optional[str] = None
dst_path: Path = field(default=Path("."))
answers_file: Optional[RelativePath] = None
vcs_ref: OptStr = None
data: AnyByStrDict = field(default_factory=dict)
exclude: StrSeq = ()
use_prereleases: bool = False
skip_if_exists: StrSeq = ()
cleanup_on_error: bool = True
defaults: bool = False
user_defaults: AnyByStrDict = field(default_factory=dict)
overwrite: bool = False
pretend: bool = False
quiet: bool = False
def _answers_to_remember(self) -> Mapping:
"""Get only answers that will be remembered in the copier answers file."""
# All internal values must appear first
answers: AnyByStrDict = {}
commit = self.template.commit
src = self.template.url
for key, value in (("_commit", commit), ("_src_path", src)):
if value is not None:
answers[key] = value
# Other data goes next
answers.update(
(str(k), v)
for (k, v) in self.answers.combined.items()
if not k.startswith("_")
and k not in self.template.secret_questions
and k in self.template.questions_data
and isinstance(k, JSONSerializable)
and isinstance(v, JSONSerializable)
)
return answers
def _execute_tasks(self, tasks: Sequence[Mapping]) -> None:
"""Run the given tasks.
Arguments:
tasks: The list of tasks to run.
"""
for i, task in enumerate(tasks):
task_cmd = task["task"]
use_shell = isinstance(task_cmd, str)
if use_shell:
task_cmd = self._render_string(task_cmd)
else:
task_cmd = [self._render_string(str(part)) for part in task_cmd]
if not self.quiet:
print(
colors.info
| f" > Running task {i + 1} of {len(tasks)}: {task_cmd}",
file=sys.stderr,
)
with local.cwd(self.subproject.local_abspath), local.env(
**task.get("extra_env", {})
):
subprocess.run(task_cmd, shell=use_shell, check=True, env=local.env)
def _render_context(self) -> Mapping:
"""Produce render context for Jinja."""
# Backwards compatibility
# FIXME Remove it?
conf = asdict(self)
conf.update(
{
"answers_file": self.answers_relpath,
"src_path": self.template.local_abspath,
"vcs_ref_hash": self.template.commit_hash,
}
)
return dict(
DEFAULT_DATA,
**self.answers.combined,
_copier_answers=self._answers_to_remember(),
_copier_conf=conf,
_folder_name=self.subproject.local_abspath.name,
_copier_python=sys.executable,
)
def _path_matcher(self, patterns: Iterable[str]) -> Callable[[Path], bool]:
"""Produce a function that matches against specified patterns."""
# TODO Is normalization really needed?
normalized_patterns = (normalize("NFD", pattern) for pattern in patterns)
spec = pathspec.PathSpec.from_lines("gitwildmatch", normalized_patterns)
return spec.match_file
def _solve_render_conflict(self, dst_relpath: Path):
"""Properly solve render conflicts.
It can ask the user if running in interactive mode.
"""
assert not dst_relpath.is_absolute()
printf(
"conflict",
dst_relpath,
style=Style.DANGER,
quiet=self.quiet,
file_=sys.stderr,
)
if self.match_skip(dst_relpath):
printf(
"skip",
dst_relpath,
style=Style.OK,
quiet=self.quiet,
file_=sys.stderr,
)
return False
if self.overwrite or dst_relpath == self.answers_relpath:
printf(
"overwrite",
dst_relpath,
style=Style.WARNING,
quiet=self.quiet,
file_=sys.stderr,
)
return True
return bool(ask(f" Overwrite {dst_relpath}?", default=True))
def _render_allowed(
self,
dst_relpath: Path,
is_dir: bool = False,
expected_contents: bytes = b"",
expected_permissions=None,
) -> bool:
"""Determine if a file or directory can be rendered.
Args:
dst_relpath:
Relative path to destination.
is_dir:
Indicate if the path must be treated as a directory or not.
expected_contents:
Used to compare existing file contents with them. Allows to know if
rendering is needed.
"""
assert not dst_relpath.is_absolute()
assert not expected_contents or not is_dir, "Dirs cannot have expected content"
dst_abspath = Path(self.subproject.local_abspath, dst_relpath)
if dst_relpath != Path("."):
if self.match_exclude(dst_relpath):
return False
try:
previous_content = dst_abspath.read_bytes()
except FileNotFoundError:
printf(
"create",
dst_relpath,
style=Style.OK,
quiet=self.quiet,
file_=sys.stderr,
)
return True
except (IsADirectoryError, PermissionError) as error:
# HACK https://bugs.python.org/issue43095
if isinstance(error, PermissionError):
if not (error.errno == 13 and platform.system() == "Windows"):
raise
if is_dir:
printf(
"identical",
dst_relpath,
style=Style.IGNORE,
quiet=self.quiet,
file_=sys.stderr,
)
return True
return self._solve_render_conflict(dst_relpath)
else:
if previous_content == expected_contents:
printf(
"identical",
dst_relpath,
style=Style.IGNORE,
quiet=self.quiet,
file_=sys.stderr,
)
return True
return self._solve_render_conflict(dst_relpath)
@cached_property
def answers(self) -> AnswersMap:
"""Container of all answers to the questionary.
It asks the user the 1st time it is called, if running interactively.
"""
result = AnswersMap(
default=self.template.default_answers,
user_defaults=self.user_defaults,
init=self.data,
last=self.subproject.last_answers,
metadata=self.template.metadata,
)
questions: List[Question] = []
for var_name, details in self.template.questions_data.items():
if var_name in result.init:
# Do not ask again
continue
questions.append(
Question(
answers=result,
ask_user=not self.defaults,
jinja_env=self.jinja_env,
var_name=var_name,
**details,
)
)
for question in questions:
# Display TUI and ask user interactively only without --defaults
try:
new_answer = (
question.get_default()
if self.defaults
else unsafe_prompt(
[question.get_questionary_structure()], answers=result.combined
)[question.var_name]
)
except KeyboardInterrupt as err:
raise CopierAnswersInterrupt(result, question, self.template) from err
previous_answer = result.combined.get(question.var_name)
# If question was skipped and it's the 1st
# run, you could be getting a raw templated value
default_answer = result.default.get(question.var_name)
if new_answer == default_answer:
new_answer = question.render_value(default_answer)
if new_answer != previous_answer:
result.user[question.var_name] = new_answer
return result
@cached_property
def answers_relpath(self) -> Path:
"""Obtain the proper relative path for the answers file.
It comes from:
1. User choice.
2. Template default.
3. Copier default.
"""
return self.answers_file or self.template.answers_relpath
@cached_property
def all_exclusions(self) -> StrSeq:
"""Combine default, template and user-chosen exclusions."""
return self.template.exclude + tuple(self.exclude)
@cached_property
def jinja_env(self) -> SandboxedEnvironment:
"""Return a pre-configured Jinja environment.
Respects template settings.
"""
paths = [str(self.template.local_abspath)]
loader = FileSystemLoader(paths)
default_extensions = [
"jinja2_ansible_filters.AnsibleCoreFiltersExtension",
]
extensions = default_extensions + list(self.template.jinja_extensions)
# We want to minimize the risk of hidden malware in the templates
# so we use the SandboxedEnvironment instead of the regular one.
# Of course we still have the post-copy tasks to worry about, but at least
# they are more visible to the final user.
try:
env = SandboxedEnvironment(
loader=loader, extensions=extensions, **self.template.envops
)
except ModuleNotFoundError as error:
raise ExtensionNotFoundError(
f"Copier could not load some Jinja extensions:\n{error}\n"
"Make sure to install these extensions alongside Copier itself.\n"
"See the docs at https://copier.readthedocs.io/en/latest/configuring/#jinja_extensions"
)
# patch the `to_json` filter to support Pydantic dataclasses
env.filters["to_json"] = partial(
env.filters["to_json"], default=pydantic_encoder
)
return env
@cached_property
def match_exclude(self) -> Callable[[Path], bool]:
"""Get a callable to match paths against all exclusions."""
return self._path_matcher(self.all_exclusions)
@cached_property
def match_skip(self) -> Callable[[Path], bool]:
"""Get a callable to match paths against all skip-if-exists patterns."""
return self._path_matcher(
map(
self._render_string,
tuple(chain(self.skip_if_exists, self.template.skip_if_exists)),
)
)
def _render_file(self, src_abspath: Path) -> None:
"""Render one file.
Args:
src_abspath:
The absolute path to the file that will be rendered.
"""
# TODO Get from main.render_file()
assert src_abspath.is_absolute()
src_relpath = src_abspath.relative_to(self.template.local_abspath).as_posix()
src_renderpath = src_abspath.relative_to(self.template_copy_root)
dst_relpath = self._render_path(src_renderpath)
if dst_relpath is None:
return
if src_abspath.name.endswith(self.template.templates_suffix):
try:
tpl = self.jinja_env.get_template(src_relpath)
except UnicodeDecodeError:
if self.template.templates_suffix:
# suffix is not empty, re-raise
raise
# suffix is empty, fallback to copy
new_content = src_abspath.read_bytes()
else:
new_content = tpl.render(**self._render_context()).encode()
else:
new_content = src_abspath.read_bytes()
dst_abspath = Path(self.subproject.local_abspath, dst_relpath)
if dst_abspath.is_dir():
return
src_mode = src_abspath.stat().st_mode
if not self._render_allowed(
dst_relpath,
expected_contents=new_content,
expected_permissions=src_mode,
):
return
if not self.pretend:
dst_abspath.write_bytes(new_content)
dst_abspath.chmod(src_mode)
def _render_folder(self, src_abspath: Path) -> None:
"""Recursively render a folder.
Args:
src_path:
Folder to be rendered. It must be an absolute path within
the template.
"""
assert src_abspath.is_absolute()
src_relpath = src_abspath.relative_to(self.template_copy_root)
dst_relpath = self._render_path(src_relpath)
if dst_relpath is None:
return
if not self._render_allowed(dst_relpath, is_dir=True):
return
dst_abspath = Path(self.subproject.local_abspath, dst_relpath)
if not self.pretend:
dst_abspath.mkdir(parents=True, exist_ok=True)
for file in src_abspath.iterdir():
if file.is_dir():
self._render_folder(file)
else:
self._render_file(file)
def _render_path(self, relpath: Path) -> Optional[Path]:
"""Render one relative path.
Args:
relpath:
The relative path to be rendered. Obviously, it can be templated.
"""
is_template = relpath.name.endswith(self.template.templates_suffix)
templated_sibling = (
self.template.local_abspath / f"{relpath}{self.template.templates_suffix}"
)
# With an empty suffix, the templated sibling always exists.
if templated_sibling.exists() and self.template.templates_suffix:
return None
rendered_parts = []
for part in relpath.parts:
# Skip folder if any part is rendered as an empty string
part = self._render_string(part)
if not part:
return None
rendered_parts.append(part)
with suppress(IndexError):
# With an empty suffix, the next instruction
# would erroneously empty the last rendered part
if is_template and self.template.templates_suffix:
rendered_parts[-1] = rendered_parts[-1][
: -len(self.template.templates_suffix)
]
result = Path(*rendered_parts)
if not is_template:
templated_sibling = (
self.template.local_abspath
/ f"{result}{self.template.templates_suffix}"
)
if templated_sibling.exists():
return None
return result
def _render_string(self, string: str) -> str:
"""Render one templated string.
Args:
string:
The template source string.
"""
tpl = self.jinja_env.from_string(string)
return tpl.render(**self._render_context())
@cached_property
def subproject(self) -> Subproject:
"""Get related subproject."""
return Subproject(
local_abspath=self.dst_path.absolute(),
answers_relpath=self.answers_file or Path(".copier-answers.yml"),
)
@cached_property
def template(self) -> Template:
"""Get related template."""
url = self.src_path
if not url:
if self.subproject.template is None:
raise TypeError("Template not found")
url = str(self.subproject.template.url)
return Template(url=url, ref=self.vcs_ref, use_prereleases=self.use_prereleases)
@cached_property
def template_copy_root(self) -> Path:
"""Absolute path from where to start copying.
It points to the cloned template local abspath + the rendered subdir, if any.
"""
subdir = self._render_string(self.template.subdirectory) or ""
return self.template.local_abspath / subdir
# Main operations
def run_auto(self) -> None:
"""Copy or update automatically.
If `src_path` was supplied, execute
[run_copy][copier.main.Worker.run_copy].
Otherwise, execute [run_update][copier.main.Worker.run_update].
"""
if self.src_path:
return self.run_copy()
return self.run_update()
def run_copy(self) -> None:
"""Generate a subproject from zero, ignoring what was in the folder.
If `dst_path` was missing, it will be
created. Otherwise, `src_path` be rendered
directly into it, without worrying about evolving what was there
already.
See [generating a project][generating-a-project].
"""
was_existing = self.subproject.local_abspath.exists()
src_abspath = self.template_copy_root
try:
if not self.quiet:
# TODO Unify printing tools
print(
f"\nCopying from template version {self.template.version}",
file=sys.stderr,
)
self._render_folder(src_abspath)
if not self.quiet:
# TODO Unify printing tools
print("") # padding space
self._execute_tasks(
[
{"task": t, "extra_env": {"STAGE": "task"}}
for t in self.template.tasks
],
)
except Exception:
if not was_existing and self.cleanup_on_error:
rmtree(self.subproject.local_abspath)
raise
if not self.quiet:
# TODO Unify printing tools
print("") # padding space
def run_update(self) -> None:
"""Update a subproject that was already generated.
See [updating a project][updating-a-project].
"""
# Check all you need is there
if self.subproject.vcs != "git":
raise UserMessageError(
"Updating is only supported in git-tracked subprojects."
)
if self.subproject.is_dirty():
raise UserMessageError(
"Destination repository is dirty; cannot continue. "
"Please commit or stash your local changes and retry."
)
if self.subproject.template is None or self.subproject.template.ref is None:
raise UserMessageError(
"Cannot update because cannot obtain old template references "
f"from `{self.subproject.answers_relpath}`."
)
if self.template.commit is None:
raise UserMessageError(
"Updating is only supported in git-tracked templates."
)
if not self.subproject.template.version:
raise UserMessageError(
"Cannot update: version from last update not detected."
)
if not self.template.version:
raise UserMessageError("Cannot update: version from template not detected.")
if self.subproject.template.version > self.template.version:
raise UserMessageError(
f"Your are downgrading from {self.subproject.template.version} to {self.template.version}. "
"Downgrades are not supported."
)
if not self.quiet:
# TODO Unify printing tools
print(
f"Updating to template version {self.template.version}", file=sys.stderr
)
# Copy old template into a temporary destination
with TemporaryDirectory(
prefix=f"{__name__}.update_diff."
) as old_copy, TemporaryDirectory(
prefix=f"{__name__}.recopy_diff."
) as new_copy:
old_worker = replace(
self,
dst_path=old_copy,
data=self.subproject.last_answers,
defaults=True,
quiet=True,
src_path=self.subproject.template.url,
vcs_ref=self.subproject.template.commit,
)
recopy_worker = replace(
self,
dst_path=new_copy,
data=self.subproject.last_answers,
defaults=True,
quiet=True,
src_path=self.subproject.template.url,
)
old_worker.run_copy()
recopy_worker.run_copy()
compared = dircmp(old_copy, new_copy)
# Extract diff between temporary destination and real destination
with local.cwd(old_copy):
subproject_top = git(
"-C",
self.subproject.local_abspath.absolute(),
"rev-parse",
"--show-toplevel",
).strip()
git("init", retcode=None)
git("add", ".")
git("config", "user.name", "Copier")
git("config", "user.email", "copier@copier")
# 1st commit could fail if any pre-commit hook reformats code
git("commit", "--allow-empty", "-am", "dumb commit 1", retcode=None)
git("commit", "--allow-empty", "-am", "dumb commit 2")
git("config", "--unset", "user.name")
git("config", "--unset", "user.email")
git("remote", "add", "real_dst", "file://" + subproject_top)
git("fetch", "--depth=1", "real_dst", "HEAD")
diff_cmd = git["diff-tree", "--unified=1", "HEAD...FETCH_HEAD"]
try:
diff = diff_cmd("--inter-hunk-context=-1")
except ProcessExecutionError:
print(
colors.warn
| "Make sure Git >= 2.24 is installed to improve updates.",
file=sys.stderr,
)
diff = diff_cmd("--inter-hunk-context=0")
# Run pre-migration tasks
self._execute_tasks(
self.template.migration_tasks("before", self.subproject.template)
)
# Clear last answers cache to load possible answers migration
with suppress(AttributeError):
del self.answers
with suppress(AttributeError):
del self.subproject.last_answers
# Do a normal update in final destination
self.run_copy()
# Try to apply cached diff into final destination
with local.cwd(self.subproject.local_abspath):
apply_cmd = git["apply", "--reject", "--exclude", self.answers_relpath]
for skip_pattern in chain(
self.skip_if_exists, self.template.skip_if_exists
):
apply_cmd = apply_cmd["--exclude", skip_pattern]
(apply_cmd << diff)(retcode=None)
# Trigger recursive removal of deleted files in last template version
_remove_old_files(self.subproject.local_abspath, compared)
# Run post-migration tasks
self._execute_tasks(
self.template.migration_tasks("after", self.subproject.template)
)
|