[Bug 1632047] Update Released

[Chris J Arges]

The verification of the Stable Release Update for ubuntu-release-
upgrader has completed successfully and the package has now been
released to -updates.  Subsequently, the Ubuntu Stable Release Updates
Team is being unsubscribed and will not receive messages about this bug
report.  In the event that you encounter a regression using the package
from -updates please report a new bug using ubuntu-bug and tag the bug
report regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1632047

Title:
  DistUpgradeViewNonInteractive except hook hides the traceback

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Xenial:
  Fix Released
Status in ubuntu-release-upgrader source package in Yakkety:
  Fix Released

Bug description:
  Test Case
  ---------
  This is a pretty obvious fix to just log more information when there is a crash.

  Regression Potential
  --------------------
  Little as we are just logging more information.

  The non-interactive version of the dist upgrade process has its own
  special except hook handler, but that handler ends up hiding the
  traceback.  This should be fixed so that we have more details about
  why the upgrade failed.  Here's the code in question:

  249 class DistUpgradeViewNonInteractive(DistUpgradeView):
  250     " non-interactive version of the upgrade view "
  251     def __init__(self, datadir=None, logdir=None):
  252         DistUpgradeView.__init__(self)
  253         self.config = DistUpgradeConfig(".")
  254         self._acquireProgress = NonInteractiveAcquireProgress()
  255         self._installProgress = NonInteractiveInstallProgress(logdir)
  256         self._opProgress = apt.progress.base.OpProgress()
  257         sys.__excepthook__ = self.excepthook
  258     def excepthook(self, type, value, traceback):
  259         " on uncaught exceptions -> print error and reboot "
  260         logging.exception("got exception '%s': %s " % (type, value))
  261         #sys.excepthook(type, value, traceback)
  262         self.confirmRestart()

  Notice nothing is done with traceback in line 260.

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