[Bug 2137023] [NEW] Set debuginfourl in ELF package note metadata

[Jeremy Bícha]

Public bug reported:

I suggest that Ubuntu set debugInfoURL to https://debuginfod.ubuntu.com

I don't really use debuginfod so I'm unsure of the effect of this
change.

Background
==========
Ubuntu sets the package note metadata by default with dpkg since June 2024. Debian does not currently do this; however, some packages like libzstd add Build-Depends: dh-package-notes and add include /usr/share/debhelper/dh_package_notes/package-notes.mk to debian/rules to get the field.

According to
https://manpages.debian.org/unstable/dh_package_notes

that will set the debugInfoURL field to https://debuginfod.debian.net/
on Debian and to https://debuginfod.ubuntu.com on Ubuntu. (Not mentioned
in the current manpage is that it's actually a no-op on Ubuntu since
package-notes 0.14.)

The manpage also says that it will set the OS field to "Ubuntu", but
Ubuntu sets it to "ubuntu" instead.

With Ubuntu 26.04 LTS (devel)
=============================
$ readelf --notes /usr/lib/x86_64-linux-gnu/libzstd.so.1


[…]

Displaying notes found in: .note.package
  Owner                Data size 	Description
  FDO                  0x00000060	FDO_PACKAGING_METADATA
    Packaging Metadata: {"type":"deb","os":"ubuntu","name":"libzstd","version":"1.5.7+dfsg-2","architecture":"amd64"}


With Debian Testing
===================
sudo apt install binutils

$ readelf --notes /usr/lib/x86_64-linux-gnu/libzstd.so.1

[…]

Displaying notes found in: .note.package
  Owner                Data size 	Description
  FDO                  0x00000090	FDO_PACKAGING_METADATA
    Packaging Metadata: {"type":"deb","os":"Debian","name":"libzstd","version":"1.5.7+dfsg-2","architecture":"amd64","debugInfoUrl":"https://debuginfod.debian.net"}

** Affects: dpkg (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2137023

Title:
  Set debuginfourl in ELF package note metadata

Status in dpkg package in Ubuntu:
  New

Bug description:
  I suggest that Ubuntu set debugInfoURL to
  https://debuginfod.ubuntu.com

  I don't really use debuginfod so I'm unsure of the effect of this
  change.

  Background
  ==========
  Ubuntu sets the package note metadata by default with dpkg since June 2024. Debian does not currently do this; however, some packages like libzstd add Build-Depends: dh-package-notes and add include /usr/share/debhelper/dh_package_notes/package-notes.mk to debian/rules to get the field.

  According to
  https://manpages.debian.org/unstable/dh_package_notes

  that will set the debugInfoURL field to https://debuginfod.debian.net/
  on Debian and to https://debuginfod.ubuntu.com on Ubuntu. (Not
  mentioned in the current manpage is that it's actually a no-op on
  Ubuntu since package-notes 0.14.)

  The manpage also says that it will set the OS field to "Ubuntu", but
  Ubuntu sets it to "ubuntu" instead.

  With Ubuntu 26.04 LTS (devel)
  =============================
  $ readelf --notes /usr/lib/x86_64-linux-gnu/libzstd.so.1

  
  […]

  Displaying notes found in: .note.package
    Owner                Data size 	Description
    FDO                  0x00000060	FDO_PACKAGING_METADATA
      Packaging Metadata: {"type":"deb","os":"ubuntu","name":"libzstd","version":"1.5.7+dfsg-2","architecture":"amd64"}

  
  With Debian Testing
  ===================
  sudo apt install binutils

  $ readelf --notes /usr/lib/x86_64-linux-gnu/libzstd.so.1

  […]

  Displaying notes found in: .note.package
    Owner                Data size 	Description
    FDO                  0x00000090	FDO_PACKAGING_METADATA
      Packaging Metadata: {"type":"deb","os":"Debian","name":"libzstd","version":"1.5.7+dfsg-2","architecture":"amd64","debugInfoUrl":"https://debuginfod.debian.net"}

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