Source code for craft_parts.sources.zip_source

# -*- Mode:Python; indent-tabs-mode:nil; tab-width:4 -*-
#
# Copyright 2015-2022 Canonical Ltd.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License version 3 as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""Implement the zip file source handler."""

import os
import zipfile
from pathlib import Path
from typing import Literal

from .base import (
    BaseFileSourceModel,
    FileSourceHandler,
    get_json_extra_schema,
    get_model_config,
)




class ZipSourceModel(BaseFileSourceModel, frozen=True):  # type: ignore[misc]
    """Pydantic model for a zip file source."""

    pattern = r"\.zip$"
    model_config = get_model_config(get_json_extra_schema(pattern))
    source_type: Literal["zip"] = "zip"





class ZipSource(FileSourceHandler):
    """The zip file source handler."""

    source_model = ZipSourceModel



    def provision(
        self,
        dst: Path,
        keep: bool = False,  # noqa: FBT001, FBT002
        src: Path | None = None,
    ) -> None:
        """Extract zip file contents to the part source dir."""
        zip_file = src if src else self.part_src_dir / os.path.basename(self.source)

        # Workaround for: https://bugs.python.org/issue15795
        with zipfile.ZipFile(zip_file, "r") as zipf:
            for info in zipf.infolist():
                extracted_file = zipf.extract(info.filename, path=dst)

                # Extract the mode from the file. Note that external_attr is
                # a four-byte value, where the high two bytes represent UNIX
                # permissions and file type bits, and the low two bytes contain
                # MS-DOS FAT file attributes. Keep the mode to permissions
                # only-- no sticky bit, uid bit, or gid bit.
                mode = info.external_attr >> 16 & 0x1FF

                # If the zip file was created on a non-unix system, it's
                # possible for the mode to end up being zero. That makes it
                # pretty useless, so ignore it if so.
                if mode:
                    os.chmod(extracted_file, mode)

        if not keep:
            os.remove(zip_file)