[Bug 1936640] Re: Download signed version from versioned URL

[Julian Andres Klode]

I checked the build logs for all releases (1.50, 1.40.6, and
1.37~18.04.10) and they all fetched via versioned URLs.

** Tags removed: verification-needed verification-needed-bionic verification-needed-focal verification-needed-hirsute
** Tags added: verification-done verification-done-bionic verification-done-focal verification-done-hirsute

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Title:
  Download signed version from versioned URL

Status in shim-signed package in Ubuntu:
  Fix Released
Status in shim-signed source package in Bionic:
  Fix Committed
Status in shim-signed source package in Focal:
  Fix Committed
Status in shim-signed source package in Hirsute:
  Fix Committed

Bug description:
  [Impact]
  shim-signed uploads FTBFS for a couple hours after upload on arm64, as the arm64 builders are behind a proxy with caching, and the proxy caches the old version for the current/ url.

  Switch the download-signed script to extract the current version from
  the apt cache and download from that instead of the unversioned
  symlink. This means it will 404 on first try, and then hopefully the
  404 is not cached for hours.

  [Test plan]
  Check it downloads versioned script during build

  [Where problems could occur]
  I can imagine that if the version number of "shim" contains special characters, they might need URL escaping. At the moment, we don't have special characters, so it should just work.

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