def __init__(self,
path: os.PathLike = pathlib.Path.home() / ".scidd_cache",
name: str = "_SciDD_API_Cache.sqlite"):
self._dbFilepath = path / name # the full path + filename for the cache
# create database path if needed
if not path.exists():
try:
os.makedirs(path)
except FileExistsError as e:
logger.debug(
f"Path '{path}' appears not to exist, but 'os.makedirs(path)' is raising FileExistsError: {e}"
)
except OSError as e:
raise OSError(
f"Unable to create specified path '{path}'; error: {e} ")
if path.is_symlink(): # or os.path.islink(fp)
if not os.path.exists(os.readlink(path)):
# broken link
raise Exception(
f"The path where the SciDD cache is expected ('{path}') is symlink pointing to a target that is no longer there. "
+ "Either remove the symlink or fix the destination.")
self._initialize_database()
def create_symlink(source_filename: PathLike,
symlink_filename: PathLike,
relative: bool = False):
"""
:param source_filename: path to point to
:param symlink_filename: path at which to create symlink
:param relative: make symlink relative to source location
"""
if not isinstance(source_filename, Path):
source_filename = Path(source_filename)
if not isinstance(symlink_filename, Path):
symlink_filename = Path(symlink_filename)
if symlink_filename.is_symlink():
logging.debug(f'removing symlink "{symlink_filename}"')
os.remove(symlink_filename)
symlink_filename = symlink_filename.parent.absolute().resolve(
) / symlink_filename.name
starting_directory = None
if relative:
starting_directory = Path().cwd().resolve()
os.chdir(symlink_filename.parent)
if source_filename.is_absolute():
try:
source_filename = source_filename.relative_to(
symlink_filename.parent)
except ValueError as error:
warnings.warn(error)
os.chdir(starting_directory)
else:
source_filename = source_filename.absolute()
try:
symlink_filename.symlink_to(source_filename)
except Exception as error:
warnings.warn(f'could not create symbolic link: {error}')
shutil.copyfile(source_filename, symlink_filename)
if starting_directory is not None:
os.chdir(starting_directory)