Bug 1421185

Summary: Random attribute order in generated feeds
Product: [Fedora] Fedora Reporter: Georg Sauthoff <fedora>
Component: python-pelicanAssignee: Matthias Runge <mrunge>
Status: CLOSED EOL QA Contact: Fedora Extras Quality Assurance <extras-qa>
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Version: 25CC: jamielinux, marcelo.barbosa, mrunge
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Last Closed: 2017-12-12 10:25:45 UTC Type: Bug
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Description Georg Sauthoff 2017-02-10 14:57:36 UTC
Description of problem:
The order of XML attributes in the generated feeds is random. This is a regression to upstream pelican because the Fedora pelican package changes the used feed generator.

Upstream pelican uses the feedgenerator python package - which is a fork of django.utils.feedgenerator. The pelican package patches this dependency which django's version (cf. python-pelican.spec):

# substitute feedgenerator with it's original django
sed -i 's|feedgenerator|django.utils.feedgenerator|' pelican/writers.py
sed -i "s|'feedgenerator >= 1.6', ||" setup.py
sed -i "s|'pytz >= 0a'|'pytz'|" setup.py

Pelican's feedgenerator implemented reproducible feed generation in 2013:
https://github.com/getpelican/feedgenerator/commit/60ec738f2c0699b2babc7ff63eac0bece39bddfc


Version-Release number of selected component (if applicable):
python3-pelican-3.6.3-6.fc25.noarch

How reproducible:
always

Steps to Reproduce:
1. generate the feeds multiple times in a row
2.
3.

Actual results:
The generated bytes aren't byte identical because the order of XML attributes changes.

Expected results:
Reproducible feed generation, e.g. without other changes the generated feeds should be byte identical.

Additional info:
cf. this pull request for djanga.utils.feedgenerator that adds ordering:
https://github.com/django/django/pull/8044

main advantage of stable feed generation: better caching behavior

Comment 1 Matthias Runge 2017-08-14 07:02:27 UTC
I see, your pull request has been merged into Django. Congrats!

Comment 2 Fedora End Of Life 2017-11-16 19:12:07 UTC
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Comment 3 Fedora End Of Life 2017-12-12 10:25:45 UTC
Fedora 25 changed to end-of-life (EOL) status on 2017-12-12. Fedora 25 is
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