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"""
utils
"""
from __future__ import annotations
import os
import platform
import shlex
import subprocess
import sys
import textwrap
import warnings
from types import CodeType
from types import FunctionType
from typing import Iterator
from typing import Mapping
from typing import NamedTuple
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from . import _types as _t
DEBUG = bool(os.environ.get("SETUPTOOLS_SCM_DEBUG"))
IS_WINDOWS = platform.system() == "Windows"
class _CmdResult(NamedTuple):
out: str
err: str
returncode: int
def no_git_env(env: Mapping[str, str]) -> dict[str, str]:
# adapted from pre-commit
# Too many bugs dealing with environment variables and GIT:
# https://github.com/pre-commit/pre-commit/issues/300
# In git 2.6.3 (maybe others), git exports GIT_WORK_TREE while running
# pre-commit hooks
# In git 1.9.1 (maybe others), git exports GIT_DIR and GIT_INDEX_FILE
# while running pre-commit hooks in submodules.
# GIT_DIR: Causes git clone to clone wrong thing
# GIT_INDEX_FILE: Causes 'error invalid object ...' during commit
for k, v in env.items():
if k.startswith("GIT_"):
trace(k, v)
return {
k: v
for k, v in env.items()
if not k.startswith("GIT_")
or k in ("GIT_EXEC_PATH", "GIT_SSH", "GIT_SSH_COMMAND")
}
def avoid_pip_isolation(env: Mapping[str, str]) -> dict[str, str]:
"""
pip build isolation can break Mercurial
(see https://github.com/pypa/pip/issues/10635)
pip uses PYTHONNOUSERSITE and a path in PYTHONPATH containing "pip-build-env-".
"""
new_env = {k: v for k, v in env.items() if k != "PYTHONNOUSERSITE"}
if "PYTHONPATH" not in new_env:
return new_env
new_env["PYTHONPATH"] = os.pathsep.join(
[
path
for path in new_env["PYTHONPATH"].split(os.pathsep)
if "pip-build-env-" not in path
]
)
return new_env
def trace(*k: object, indent: bool = False) -> None:
if DEBUG:
if indent and len(k) > 1:
k = (k[0],) + tuple(textwrap.indent(str(s), " ") for s in k[1:])
print(*k, file=sys.stderr, flush=True)
def ensure_stripped_str(str_or_bytes: str | bytes) -> str:
if isinstance(str_or_bytes, str):
return str_or_bytes.strip()
else:
return str_or_bytes.decode("utf-8", "surrogateescape").strip()
def _run(cmd: _t.CMD_TYPE, cwd: _t.PathT) -> subprocess.CompletedProcess[str]:
return subprocess.run(
cmd,
capture_output=True,
cwd=str(cwd),
env=dict(
avoid_pip_isolation(no_git_env(os.environ)),
# os.environ,
# try to disable i18n
LC_ALL="C",
LANGUAGE="",
HGPLAIN="1",
),
text=True,
)
def do_ex(cmd: _t.CMD_TYPE, cwd: _t.PathT = ".") -> _CmdResult:
if not DEBUG or not isinstance(cmd, list):
cmd_4_trace = cmd
else:
# give better results than shlex.join in our cases
cmd_4_trace = " ".join(
[s if all(c not in s for c in " {[:") else f'"{s}"' for s in cmd]
)
trace("----\ncmd:\n", cmd_4_trace, indent=True)
trace(" in:", cwd)
if os.name == "posix" and not isinstance(cmd, (list, tuple)):
cmd = shlex.split(cmd)
res = _run(cmd, cwd)
if res.stdout:
trace("out:\n", res.stdout, indent=True)
if res.stderr:
trace("err:\n", res.stderr, indent=True)
if res.returncode:
trace("ret:", res.returncode)
return _CmdResult(
ensure_stripped_str(res.stdout), ensure_stripped_str(res.stderr), res.returncode
)
def do(cmd: list[str] | str, cwd: str | _t.PathT = ".") -> str:
out, err, ret = do_ex(cmd, cwd)
if ret and not DEBUG:
print(err)
return out
def data_from_mime(path: _t.PathT) -> dict[str, str]:
with open(path, encoding="utf-8") as fp:
content = fp.read()
trace("content", repr(content))
# the complex conditions come from reading pseudo-mime-messages
data = dict(x.split(": ", 1) for x in content.splitlines() if ": " in x)
trace("data", data)
return data
def function_has_arg(fn: object | FunctionType, argname: str) -> bool:
assert isinstance(fn, FunctionType)
code: CodeType = fn.__code__
return argname in code.co_varnames
def has_command(name: str, args: list[str] | None = None, warn: bool = True) -> bool:
try:
cmd = [name, "help"] if args is None else [name, *args]
p = _run(cmd, ".")
except OSError:
trace(*sys.exc_info())
res = False
else:
res = not p.returncode
if not res and warn:
warnings.warn("%r was not found" % name, category=RuntimeWarning)
return res
def require_command(name: str) -> None:
if not has_command(name, warn=False):
raise OSError("%r was not found" % name)
def iter_entry_points(
group: str, name: str | None = None
) -> Iterator[_t.EntrypointProtocol]:
from ._entrypoints import iter_entry_points
return iter_entry_points(group, name)
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