[Bug 1928100] Re: TLS handshake is fatal, not transient - hence not retried

[Julian Andres Klode]

autopkgtest have passed, so verified

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

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https://bugs.launchpad.net/bugs/1928100

Title:
  TLS handshake is fatal, not transient - hence not retried

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Hirsute:
  Fix Committed

Bug description:
  [Impact]
  TLS handshakes are reported as fatal errors rather than transient errors like other connection errors on unencrypted connections. This seems wrong - a server may just be spinning up or down and fail during the handshake, and prevents retrying such downloads

  [Test plan]

  A test case has been added to the integration test suite that ensures
  handshake errors are retried upon configuration.

  [Where problems could occur]
  Transient errors do not cause an error exit from apt update, so scripts relying on errors from TLS handshakes in such situations will fail.

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