fix: stabilize RSS feed GUIDs for multi-arch wheel publication - #1382
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📝 WalkthroughWalkthroughRSS release queries now collect package filenames. Feed GUIDs use distinct PEP 427 wheel build tags instead of publication timestamps. Both feed renderers pass filenames to GUID generation, with unit and functional tests covering tagged, untagged, and multi-architecture inputs. ChangesRSS GUID stability
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: 🔵 Low · up to This change correctly stabilizes RSS GUIDs using wheel build tags instead of timestamps, matching the stated objective, and functional/unit tests validate the common stable and changing GUID scenarios. One narrow edge case remains: a build tag containing a comma (technically permitted by the wheel filename spec, though rare in practice) could cause the GUID fragment to collide with a different set of build tags, silently hiding a real rebuild from RSS subscribers. This is a low-risk, easily fixable gap and does not block merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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In `@pulp_python/tests/functional/api/test_pypi_feeds.py`:
- Line 193: Update the fixture download using requests.get in the relevant test
setup to pass an explicit timeout shorter than the suite’s 300-second
pytest-timeout, while preserving the existing PYTHON_WHEEL_URL request and
response handling.
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Base GUIDs on PEP 427 build tags instead of timestamps so that additional platform wheels for the same build do not cause feed readers to show duplicate entries. Closes pulp#1381 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Signed-off-by: Ryan Petrello <ryan@ryanpetrello.com>
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Inline comments:
In `@pulp_python/app/pypi/feeds.py`:
- Line 111: Update the build-tag formatting in the function containing the
“#builds=” return so each tag is percent-encoded before sorting/joining,
preserving commas as separators while distinguishing embedded commas. Add a unit
test covering a single “1,2” build tag and its encoded output.
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ryanpetrello
changed the title
| def _build_tag_fragment(filenames): | ||
| """Extract sorted distinct build tags from wheel filenames for GUID stability. | ||
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| Returns a fragment like ``#builds=1,2`` when build tags are present, |
| # Duplicated here to avoid importing feeds.py, which pulls in Django/DRF and | ||
| # requires a configured Django settings module that the unit test runner lacks. |
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If you add pytest-django to unittest_requirements.txt then you could import this constant with no issue.
| @@ -0,0 +1 @@ | |||
| RSS feed GUIDs are now stable when additional platform wheels arrive for the same release. GUIDs only change when a new PEP 427 build tag is introduced, preventing feed readers from showing duplicate entries for multi-architecture builds. | |||
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I know this feature is one you requested, but I wonder if we are deviating from PyPI's behavior. Can you show me an example of a package on PyPI that updates their entries based on build-tags?
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That's a pretty good point 🤔 - we may be coloring this RSS implementation with our desired behavior, and not with parity in terms of what PyPI actually does.
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Yea, @mprpic, we may actually be at an impasse here. Looking at what PyPI actually exposes in its RSS feed, it doesn't provide a <guid> element, which means it just falls back to the <link>.
PyPI's link is https://pypi.org/project/{name}/{version}/ -- one entry per (name, version), no timestamp, no build tag.
So if we're modeling this after the way that PyPI behaves, the link is the GUID; adding more wheels to an existing release doesn't create a new RSS entry.
So even though the original limitation you discovered doesn't work the way we expected it to, it matches what PyPI does (and I understand why Pulp maintainers would want to mirror the PyPI implementation).
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Looking at an example it seems that PyPI doesn't even use GUID: https://pypi.org/rss/project/tensorflow/releases.xml
On the other hand maybe this is a limitation of PyPI and their RSS feeds would be more useful with this.
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Summary
Fixes #1381
Test plan
#builds=1; add tag 2 -> GUID#builds=1,2; add new arch for tag 2 -> GUID stable_build_tag_fragment🤖 Generated with Claude Code
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