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[Launchpad Bug Tracker <1837254@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package livecd-rootfs - 2.408.54

---------------
livecd-rootfs (2.408.54) xenial; urgency=medium

  * Revert exclusion of makedev from buildd chroots, as it turned out not to
    be the problem.  Instead, fix up /dev/ptmx to be a character device node
    rather than a symlink to /dev/pts/ptmx, in line with the discussion in
    https://bugs.debian.org/817236; I think this is safer than
    cherry-picking the fix to debootstrap at this point in a stable release
    cycle (LP: #1844504).

livecd-rootfs (2.408.53) xenial; urgency=medium

  * Fix exclusion of makedev from buildd chroots; debootstrap doesn't
    respect --exclude for "Priority: required" packages, so we have to purge
    makedev later (LP: #1844504).

livecd-rootfs (2.408.52) xenial; urgency=medium

  * Exclude makedev from buildd chroots, since it was historically excluded
    and apparently breaks some builds (e.g. mir; LP: #1844504).

livecd-rootfs (2.408.51) xenial; urgency=medium

  * ubuntu-cpc: Only produce explicitly specified artifacts (LP:
#1837254)

 -- Colin Watson <cjwatson@xxxxxxxxxx>  Thu, 26 Sep 2019 10:53:23 +0100

** Changed in: livecd-rootfs (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

** Bug watch added: Debian Bug tracker #817236
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=817236

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https://bugs.launchpad.net/bugs/1837254

Title:
  ubuntu-cpc parallel builds produce unused files

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Xenial:
  Fix Released
Status in livecd-rootfs source package in Bionic:
  Fix Released
Status in livecd-rootfs source package in Disco:
  Fix Released

Bug description:
  [Impact]

  In parallel builds where a list of image targets are provided, the build
  may produce binaries that are not part of the named set of targets but
  are created by series dependencies.  These implicitly created binaries
  may be generated by multiple builds but are unused as our convention for
  the ubuntu-cpc project is to only consume binaries from the explicitly
  named image targets; this avoids overwriting the same object by multiple
  parallel builds.  The problem is that as we build out parallel jobs for
  a number of image targets (multiplied by each supported architecture)
  we're wasting a lot of resources.

  [Test Case]

   * Specify an image target within the ubuntu-cpc project for a build

   * Observe artifacts in addition to the ones for the named image
  target are produced and downloaded

  [Regression Potential]

   * An artifact from an explicitly named artifact is missing and builds
  will begin to remove desired output.  Testing is being done to address
  this regression.

  [Other Info]

   * This has been running in production in Eoan for a few weeks and
  we're satisfied with the results.  We have seen overall time reduced
  by 20-50% on some builds.

  [Original Description]

  In parallel builds where a list of image targets are provided, the build
  may produce binaries that are not part of the named set of targets but
  are created by series dependencies.  These implicitly created binaries
  may be generated by multiple builds but are unused as our convention for
  the ubuntu-cpc project is to only consume binaries from the explicitly
  named image targets; this avoids overwriting the same object by multiple
  parallel builds.  The problem is that as we build out parallel jobs for
  a number of image targets (multiplied by each supported architecture)
  we're wasting a lot of resources.

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