** Tags added: id-5a9f9b96fff3bd2877ffa9de

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  [FFe] apt 1.6~rc1, zstd & hook support

Status in apt package in Ubuntu:

Bug description:
  As discussed previously, we want to have zstd support in 18.04 to evaluate 
and potentially enable it in later releases. We also want to add hooks for
  snap integration to apt, this release is supposed to add them too.

  The new features are not invasive - they are new code with a few
  places too hook them in. If no zstd is used, or if no hooks are
  registered, then there will be basically no change in behavior (or
  code paths).

  # FEATURE: zstd
  The zstd support adds a dependency on libzstd1 to libapt-pkg5.0. This should 
not have any effect on live images, since libzstd1 is part of the various live 
tasks, as btrfs-progs need it. For installed systems, this might be a new 
dependency (if they do not use btrfs, tor, or some other tools), so an increase 
of ~520 KB, as that's the size of the library and the library only depends on 

  This also depends on the zstd patch in dpkg being uploaded. If this
  unexpectedly does not happen, and I upload apt first, I'd revert it
  later before the release.

  # FEATURE: hooks
  The concrete code is still undergoing review, some option names might change 
for the hooks before release (e.g. pre-download might become 
pre-install-prompt, and the AptCli::Hooks config section only gets Install and 
Search lists for hooks to register, rather than individual pre-, post-, and 
fail- lists).

  # other changes
  We disable the seccomp sandbox for methods for the release, as it turns out 
there are still too many failure cases for it to be worthwhile to enable (NSS 
modules, weird libc functions calling weird syscalls, etc). People can 
re-enable it with a config option.

  the rest is bug fixes. some change translatable strings in
  documentation, but fix up the translation too. A few additional
  strings are added to the sources.list man page ("mention mirror method
  in sources.list (Closes: 679580)", but I'm happy to back them out.

  There are also some CI fixes, and the major cache version is bumped so
  we can issue updates independently for 1.5 and 1.6 apt release series.

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