[Bug 1668285] Re: [SRU] Update apt/xenial to 1.2.20

[Julian Andres Klode]

I've been doing a middle-large upgrade today, alongside some other more
focused tests, and everything seems to have worked fine. Let's mark this
as verified.

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

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Title:
  [SRU] Update apt/xenial to 1.2.20

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

Bug description:
  [Impact]
  Subset of bug #1668280 basically, to the extend the apply to 1.2. This is a far saner amount of changes than in 1.3.5, because we don't have the installation ordering changes as the new installation ordering was introduced in 1.3.

    [ David Kalnischkies ]
    * don't install new deps of candidates for kept back pkgs
    * keep Release.gpg on untrusted to trusted IMS-Hit (Closes: 838779)
      (LP: #1657440)
    * reset HOME, USER(NAME), TMPDIR & SHELL in DropPrivileges (Closes: 842877)
    * add TMP/TEMP/TEMPDIR to the TMPDIR DropPrivileges dance
    * let {dsc,tar,diff}-only implicitly enable download-only
    * don't show update stats if cache generation is disabled
    * don't lock dpkg in 'apt-get clean'
    * don't lock dpkg in update commands
    * avoid validate/delete/load race in cache generation
    * remove 'old' FAILED files in the next acquire call (Closes: 846476)
    * stop rred from leaking debug messages on recovered errors (Closes: #850759)

    [ Paul Wise ]
    * show output as documented for APT::Periodic::Verbose 2 (Closes: 845599)

    [ John R. Lenton ]
    * bash-completion: Only complete understood file paths for install
      (LP: #1645815)

    [ Lukasz Kawczynski ]
    * Honour Acquire::ForceIPv4/6 in the https transport

    [ Julian Andres Klode ]
    * basehttp: Only read Content-Range on 416 and 206 responses (LP: #1657567)
    * Only merge acquire items with the same meta key (Closes: #838441)
    * Do not package names representing .dsc/.deb/... files (Closes: #854794)
    * Don't use -1 fd and AT_SYMLINK_NOFOLLOW for faccessat()
      Thanks to James Clarke for debugging these issues

  [Test case]
  Mentioned launchpad bugs have their own test case sections. The rest is checked in the CI, so we should just do some updates upgrades and check that everything works.

  [Regression Potential]
  In #1668280, about 80% of the code changes are covered by test cases. This leaves out most code changes that are not covered, so code coverage should be higher, reducing the regression potential enormously.

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