docker-autotag/dockerautotag/utils.py

60 lines
1.2 KiB
Python

"""Global utility methods and classes."""
import os
def normalize_path(path):
if path:
return os.path.abspath(os.path.expanduser(os.path.expandvars(path)))
return None
def strtobool(value):
"""Convert a string representation of truth to true or false."""
_map = {
"y": True,
"yes": True,
"t": True,
"true": True,
"on": True,
"1": True,
"n": False,
"no": False,
"f": False,
"false": False,
"off": False,
"0": False
}
try:
return _map[str(value).lower()]
except KeyError as err:
raise ValueError(f'"{value}" is not a valid bool value') from err
def to_bool(string):
return bool(strtobool(str(string)))
def trim_prefix(text, prefix):
if text.startswith(prefix):
return text[len(prefix):]
return text
def to_prerelease(tup):
return ".".join(tup)
class Singleton(type):
"""Meta singleton class."""
_instances = {}
def __call__(cls, *args, **kwargs):
if cls not in cls._instances:
cls._instances[cls] = super().__call__(*args, **kwargs)
return cls._instances[cls]