[Bug 1876875] Re: Improve download-signed script to support current & grub2

[Francis Ginther]

** Tags added: id-5eb1356d8ee9193c6cf7fc0b

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Title:
  Improve download-signed script to support current & grub2

Status in grub2-signed package in Ubuntu:
  New
Status in linux-signed package in Ubuntu:
  New
Status in s390-tools-signed package in Ubuntu:
  New

Bug description:
  [Impact]

   * Improve and generalise download-signed script to allow using it with any signed binaries we care about
   * Add support to download simply the most current version
   * Add support to download /uefi/ signed binaries
   * Clean up arg parsing, add help, drop unused statements & imports.

  [Test Case]

   * Test downloading signed kernel works with public & private archives
   * Test that rebuilt signed .debs are the same

  [Regression Potential]

   * This is a built time script, as long the binaries are downloaded &
  packaged up the same, there is no end-user facing impact.

  [Other Info]
   
   * With these changes, download-signed script can be used by s390-tools-signed & grub2-signed, as well as all the kernels.

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