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[Simon Chopin <2115573@xxxxxxxxxxxxxxxxxx>]

So, that was my idea for the algorithm:

1. We add the ability to generate a substvar-like output to the vendor script, e.g. --substvar. It goes to stdout, and defines 'dh-cargo:Vendored-Sources'
2. In the clean target in dh-cargo, we generate d/dh-cargo-source.substvars in d/rules.
3. In the configure target, where we previously did the sanity check, now the check is:
  If no field:
    error("add substvar support")
  If hardcoded field (== no mention of dh-cargo-source.substvars in d/source/options):
    warning("add substvar support")
  If field mismatch:
    previous error

HOWEVER that doesn't work for one really stupid reason: there is no long
option equivalent to -Tdh-cargo-source.substvars. And
debian/source/options only works for long options.

That would be the reason I didn't do it like this in the first place, I
guess.

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https://bugs.launchpad.net/bugs/2115573

Title:
  Have dh-cargo-vendored-sources update debian/control rather than just
  verify it

Status in dh-cargo package in Ubuntu:
  New

Bug description:
  It would be helpful for package update automation if dh-cargo-
  vendored-sources would be updated to directly update the XS-Vendored-
  Sources-Rust field in debian/control rather than only verifying that
  it is correct.

  If updating debian/control directly is undesirable, an alternative is
  to have a different command line option that directly outputs the
  expected XS-Vendored-Sources-Rust line. This would avoid users needing
  to parse stderr which feels awkward.

  My usecase is inclusion in a custom rule in debian/rules to update the
  vendoring of a package instead of a long list of instructions or
  commands. The custom rule would be run locally by the package
  contributor to prepare the updated package and not at buildtime. I
  believe every Rust package in main needs to have either a rule or
  script or documentation to do the vendoring, so I expect my requested
  feature here would be widely used.

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