[Bug 2051155] [NEW] dh-cargo generating empty/invalid X-Cargo-Built-Using fields

[Steve Beattie]

Public bug reported:

dh-cargo as of 0.30ubuntu1 is generating not well formatted X-Cargo-
Built-Using: tag entries. Two examples of this are:

- helvum in mantic and noble, which apt show contains:

  Homepage: https://gitlab.freedesktop.org/ryuukyu/helvum
  X-Cargo-Built-Using: 
   ,
  Download-Size: 365 kB

- oxigraph-server in noble, which apt show contains:

  Homepage: https://github.com/oxigraph/oxigraph
  X-Cargo-Built-Using:
    (= ), rust-adler (= 1.0.2-2), rust-aho-corasick (= 1.1.2-1), [rest of build dependencies elided]

I'm assuming these are not intentional, and they cause tooling that
parses these entries to be more complex.

** Affects: dh-cargo (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2051155

Title:
  dh-cargo generating empty/invalid X-Cargo-Built-Using fields

Status in dh-cargo package in Ubuntu:
  New

Bug description:
  dh-cargo as of 0.30ubuntu1 is generating not well formatted X-Cargo-
  Built-Using: tag entries. Two examples of this are:

  - helvum in mantic and noble, which apt show contains:

    Homepage: https://gitlab.freedesktop.org/ryuukyu/helvum
    X-Cargo-Built-Using: 
     ,
    Download-Size: 365 kB

  - oxigraph-server in noble, which apt show contains:

    Homepage: https://github.com/oxigraph/oxigraph
    X-Cargo-Built-Using:
      (= ), rust-adler (= 1.0.2-2), rust-aho-corasick (= 1.1.2-1), [rest of build dependencies elided]

  I'm assuming these are not intentional, and they cause tooling that
  parses these entries to be more complex.

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