[Bug 1837254] Please test proposed package

[Timo Aaltonen]

Hello Robert, or anyone else affected,

Accepted livecd-rootfs into xenial-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/livecd-
rootfs/2.408.51 in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to livecd-rootfs in Ubuntu.
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 Committed
Status in livecd-rootfs source package in Bionic:
  Fix Committed
Status in livecd-rootfs source package in Disco:
  Fix Committed

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/1837254/+subscriptions