Broken PDF link for certner-mac_do-mdo-setcred (404 Not Found)

[Wang-Yan-Hao]

The link to the EuroBSDCon 2025 paper “Controlled credentials transitions without privileges (mac_do / mdo / setcred)” appears to be broken and returns a 404.

Broken url: https://papers.freebsd.org/2025/EuroBSDCon/certner-mac_do-mdo-setcred.files/certner-mac_do-mdo-setcred.pdf

[lwhsu]

cc @OlCe2

[OlCe2]

This appears to be some misconfiguration of nginx (or perhaps Hugo).

Some data that makes me say that and that will help find the bug:

• The link generated on the website, apparently from the presence of a sub-directory and a PDF file in it, does not work (this is the initial report above).
• The following alternate link, which is the non-working one but with "EuroBSDCon" turned into "eurobsdcon" all in lower case, works: https://papers.freebsd.org/2025/eurobsdcon/certner-mac_do-mdo-setcred.files/certner-mac_do-mdo-setcred.pdf
• I've checked that I did the same steps as in my earlier submissions and as others have recently being doing (Christos, Mateusz), which all work, and don't see that I did anything different.
• The PDF link on page https://papers.freebsd.org/2025/eurobsdcon/margiolis-re-de-centralizing-the-internet-with-bsd/ works, though it also produces "EuroBSDCon" in that exact case in the PDF URL.
• The PDF link on the https://papers.freebsd.org/2024/eurobsdcon/certner-scheduling_priorities_and_freebsd/ works, and produces "eurobsdcon" in the PDF URL. I suspect this comes from the fact that the directory in the git repository is eurobsdcon (under 2024), whereas for 2025 it is EuroBSDCon.
• But we have BSDCan under 2024 in the git repo, and if going, e.g., to https://papers.freebsd.org/2024/bsdcan/norris_openzfs-fsync-zil/, the PDF link works (and has "BSDCan" with this exact case).

So I don't know what to do from here, and I probably can't do anything to it by myself.

Renaming content/2025/EuroBSDCon to content/2025/eurobsdcon might work, but then why is the PDF URL pointing to a file in directory content/2025/EuroBSDCon/margiolis-Re-de-centralizing-the-Internet-with-BSD.files working, and not the one pointing to a file in content/2025/EuroBSDCon/certner-mac_do-mdo-setcred.files?

@lwhsu Are you administering the machine serving papers.freebsd.org? If not, who could we contact?

[OlCe2]

Oh, and I forgot, local tests with Python's http.server do not exhibit that problem (the reported links works out-of-the-box).

Any ideas?

[OlCe2]

@Wang-Yan-Hao In the meantime, you can use the following URL: https://papers.freebsd.org/2025/eurobsdcon/certner-mac_do-mdo-setcred.files/certner-mac_do-mdo-setcred.pdf.

[ppaeps]

I'm not sure if this fixes anything, but that's the only difference between your talk and Christos's.

[Wang-Yan-Hao]

@Wang-Yan-Hao In the meantime, you can use the following URL: https://papers.freebsd.org/2025/eurobsdcon/certner-mac_do-mdo-setcred.files/certner-mac_do-mdo-setcred.pdf.

Thanks @OlCe2, the lowercase workaround link works for me.

@ppaeps Thanks for the commit. I'll wait for the site to rebuild and check if removing the venue: field resolves the issue with the default link.