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[Launchpad Bug Tracker <1694697@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package apt - 1.2.24

---------------
apt (1.2.24) xenial; urgency=medium

  * Microrelease covering fixes of 1.4.6
  * Fix parsing of or groups in build-deps with ignored packages (LP: #1694697)
  * apt.systemd.daily: Use unattended-ugrade --download-only if available.
    Instead of passing -d, which enables a debugging mode; check if
    unattended-upgrade supports an option --download-only (which is yet
    to be implemented) and use that (Closes: #863859)

apt (1.2.23) xenial; urgency=medium

  * Microrelease covering fixes of 1.4.4

  [ Alan Jenkins ]
  * apt.systemd.daily: fix error from locking code (Closes: #862567)

apt (1.2.22) xenial; urgency=medium

  [ Julian Andres Klode ]
  * Run unattended-upgrade -d in download part
  * apt.systemd.daily: Add locking
  * Split apt-daily timer into two (LP: #1686470)

  [ Matt Kraai ]
  * bash-completion: Fix spelling of autoclean (Closes: #861846)

apt (1.2.21) xenial; urgency=medium

  * Microrelease covering fixes of 1.4 and 1.4.1

  [ Julian Andres Klode ]
  * Ignore \.ucf-[a-z]+$ like we do for \.dpkg-[a-z]+$
  * systemd: Rework timing and add After=network-online (was LP #1615482)

  [ David Kalnischkies ]
  * Fix and avoid quoting in CommandLine::AsString (LP: #1672710)

  [ Unit 193 ]
  * apt-ftparchive: Support '.ddeb' dbgsym packages

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Mon, 19 Jun 2017 13:58:04
+0200

** Changed in: apt (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1694697

Title:
  build-depends keeps OR flag if end of or group is ignored

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Trusty:
  New
Status in apt source package in Xenial:
  Fix Released
Status in apt source package in Yakkety:
  Won't Fix
Status in apt source package in Zesty:
  Fix Committed

Bug description:
  [Impact]
  If the last alternative(s) of an Or group is ignored, because it does
  not match an architecture list, we would end up keeping the or flag,
  effectively making the next AND an OR.

  For example, when parsing (on amd64):

      debhelper (>= 9), libnacl-dev [amd64] | libnacl-dev [i386]
   => debhelper (>= 9), libnacl-dev |

  Which can cause python-apt and apt-get build-dep to crash.

  Even worse:

       debhelper (>= 9), libnacl-dev [amd64] | libnacl-dev [i386], foobar
    => debhelper (>= 9), libnacl-dev [amd64] | foobar

  [Test case]
  On amd64:

  cat > segv.dsc  << EOF
  Format: 3.0 (native)
  Source: foobar
  Binary: foobar
  Architecture: all
  Version: 1
  Maintainer: Joe Sixpack <joe@xxxxxxxxxxx>
  Build-Depends: build-essential [amd64] | build-essential [fancy]
  Standards-Version: 3.9.8
  EOF
  cat > failure.dsc  << EOF
  Format: 3.0 (native)
  Source: foobar
  Binary: foobar
  Architecture: all
  Version: 1
  Maintainer: Joe Sixpack <joe@xxxxxxxxxxx>
  Build-Depends: build-essential [amd64] | build-essential [fancy], a-non-existing-package
  Standards-Version: 3.9.8
  EOF

  (1) apt-get build-dep -s ./segv.dsc should succeed instead of crash
  (2) apt-get build-dep -s ./failure.dsc should complain about "Depends: a-non-existing-package but it is not installable" instead of succeeding.

  This is the same test as run by CI and autopkgtests, so if they pass
  the tests passed. You can also run apt-get build-dep -s dq for a real
  life example that should not segfault.

  [Regression Potential]
  apt-get build-dep and friends can now fail where they succeeded previously for packages that employ architecture-limited alternatives in their build depends, as in the second example given above, because now additional packages need to be installed (which is correct, though).

  [Other info]
  By setting the previous alternatives Or flag to the current Or flag
  if the current alternative is ignored, we solve the issue.

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