[Bug 1511831] [NEW] dist upgrade quirk for linux metapackage crashes if package is not in cache

[Brian Murray]

Public bug reported:

The Ubuntu Error Tracker has some reports indicating the release
upgrader can crash when running the install_linux_metapackage quirk.
Here is the Traceback:

Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-tsk6132y/wily", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeMain.py", line 240, in main
    if app.run():
  File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeController.py", line 1837, in run
    return self.fullUpgrade()
  File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeController.py", line 1790, in fullUpgrade
    if not self.askDistUpgrade():
  File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeController.py", line 978, in askDistUpgrade
    if not self.cache.distUpgrade(self._view, self.serverMode, self._partialUpgrade):
  File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeCache.py", line 215, in wrapper
    res = f(*args, **kwargs)
  File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeCache.py", line 624, in distUpgrade
    self.post_upgrade_rule()
  File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeCache.py", line 463, in post_upgrade_rule
    self.quirks.run("PostDistUpgradeCache")
  File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeQuirks.py", line 102, in run
    func()
  File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeQuirks.py", line 136, in wilyPostDistUpgradeCache
    self._install_linux_metapackage()
  File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeQuirks.py", line 660, in _install_linux_metapackage
    if not cache[linux_metapackage].is_installed:
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 205, in __getitem__
    raise KeyError('The cache has no package named %r' % key)
KeyError: "The cache has no package named 'linux-rpi2'"

These are the buckets:
https://errors.ubuntu.com/problem/37aa9dc242cd00bad6a1f3b598e883b860754d29
https://errors.ubuntu.com/problem/ab6522ce1b227b12711e3d624d0cf780660e0b23
https://errors.ubuntu.com/problem/994bf05fae85fbcd44f721495db6518f2d5a126d

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: High
         Status: Triaged


** Tags: wily xenial

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => High

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Triaged

** Tags added: wily xenial

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https://bugs.launchpad.net/bugs/1511831

Title:
  dist upgrade quirk for linux metapackage crashes if package is not in
  cache

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged

Bug description:
  The Ubuntu Error Tracker has some reports indicating the release
  upgrader can crash when running the install_linux_metapackage quirk.
  Here is the Traceback:

  Traceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-tsk6132y/wily", line 8, in <module>
      sys.exit(main())
    File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeMain.py", line 240, in main
      if app.run():
    File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeController.py", line 1837, in run
      return self.fullUpgrade()
    File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeController.py", line 1790, in fullUpgrade
      if not self.askDistUpgrade():
    File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeController.py", line 978, in askDistUpgrade
      if not self.cache.distUpgrade(self._view, self.serverMode, self._partialUpgrade):
    File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeCache.py", line 215, in wrapper
      res = f(*args, **kwargs)
    File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeCache.py", line 624, in distUpgrade
      self.post_upgrade_rule()
    File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeCache.py", line 463, in post_upgrade_rule
      self.quirks.run("PostDistUpgradeCache")
    File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeQuirks.py", line 102, in run
      func()
    File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeQuirks.py", line 136, in wilyPostDistUpgradeCache
      self._install_linux_metapackage()
    File "/tmp/ubuntu-release-upgrader-tsk6132y/DistUpgrade/DistUpgradeQuirks.py", line 660, in _install_linux_metapackage
      if not cache[linux_metapackage].is_installed:
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 205, in __getitem__
      raise KeyError('The cache has no package named %r' % key)
  KeyError: "The cache has no package named 'linux-rpi2'"

  These are the buckets:
  https://errors.ubuntu.com/problem/37aa9dc242cd00bad6a1f3b598e883b860754d29
  https://errors.ubuntu.com/problem/ab6522ce1b227b12711e3d624d0cf780660e0b23
  https://errors.ubuntu.com/problem/994bf05fae85fbcd44f721495db6518f2d5a126d

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