Support deprecated licenses for download

CHANGELOG.md

@@ -58,6 +58,7 @@ The versions follow [semantic versioning](https://semver.org).
 ### Fixed
 
 - Sanitize xargs input in scripts documentation
+- Support deprecated licences for `reuse download`. (#606)
 - License identifiers in comments with symmetrical ASCII art frames are now
   properly detected (#560)
 - Fixed an error where copyright statements contained within a multi-line

src/reuse/download.py

@@ -38,6 +38,8 @@ def download_license(spdx_identifier: str) -> str:
     :raises requests.RequestException: if the license could not be downloaded.
     :return: The license text.
     """
+    if spdx_identifier not in ALL_NON_DEPRECATED_MAP:
+        spdx_identifier = f"deprecated_{spdx_identifier}"
     # This is fairly naive, but I can't see anything wrong with it.
     url = urljoin(_SPDX_REPOSITORY_BASE_URL, "".join((spdx_identifier, ".txt")))
     # TODO: Cache result?

tests/test_download.py

@@ -5,6 +5,7 @@
 """All tests for reuse.download"""
 
 from pathlib import Path
+from unittest.mock import MagicMock
 
 import pytest
 import requests
@@ -49,6 +50,14 @@ def raise_exception(_):
         download_license("hello world")
 
 
+def test_download_deprecated(monkeypatch):
+    """Adjust the requested file for deprecated licenses."""
+    mocked = MagicMock(return_value=MockResponse("hello", 200))
+    monkeypatch.setattr(requests, "get", mocked)
+    download_license("GPL-3.0")
+    assert "deprecated_GPL-3.0" in mocked.call_args[0][0]
+
+
 def test_put_simple(fake_repository, monkeypatch):
     """Straightforward test."""
     monkeypatch.setattr(requests, "get", lambda _: MockResponse("hello\n", 200))