add: fetch metadata archives

depinspect/fetch/__init__.py

@@ -0,0 +1,21 @@
+# MIT License
+
+# Copyright (c) 2023 Artem Burashnikov <artem.burashnikov@gmail.com>
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.

depinspect/fetch/fetch.py

@@ -0,0 +1,14 @@
+from pathlib import Path
+from urllib import request
+import time
+
+# url = "http://ports.ubuntu.com/dists/jammy/main/binary-riscv64/Packages.xz"
+# target_path = Path.joinpath(Path(__file__).parent, "riscv64Packages.xz")
+
+
+def fetch_packages_metadata(metadata_url: str, local_target_path: Path):
+    # https://docs.python.org/3/library/urllib.request.html#urllib.request.Request
+    # NOTE: Transfer-Encoding: chunked (streaming) will be auto-selected
+    with request.urlopen(request.Request(metadata_url), timeout=15.0) as response:
+        if response.status == 200:
+            request.urlretrieve(metadata_url, local_target_path)