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

[Julian Andres Klode]

Public bug reported:

[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.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

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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:
  New

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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