[Bug 2080233] [NEW] [wsl] do-release-upgrade fails with systemd disabled

[Jean-Baptiste Lallement]

Public bug reported:

Original report: https://github.com/ubuntu/WSL/issues/493

On WSL, systemd is not always enabled. This is the case on WSL1 where it
cannot be enabled and on WSL2 when it's been disabled or not enabled by
default.

When systemd is not available do-release-upgrade fails with the error
below and upgrade is cancelled:

"""
Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-uqmd8iby/noble", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeMain.py", line 241, in main
    if app.run():
  File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeController.py", line 2642, in run
    return self.fullUpgrade()
  File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeController.py", line 2447, in fullUpgrade
    if not self.doPostInitialUpdate():
  File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeController.py", line 1438, in doPostInitialUpdate
    self.quirks.run("PostInitialUpdate")
  File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeQuirks.py", line 102, in run
    func()
  File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeQuirks.py", line 127, in noblePostInitialUpdate
    self._test_and_fail_on_tpm_fde()
  File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeQuirks.py", line 1898, in _test_and_fail_on_tpm_fde
    snap_list = subprocess.check_output(['snap', 'list'])
  File "/usr/lib/python3.10/subprocess.py", line 421, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/usr/lib/python3.10/subprocess.py", line 526, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['snap', 'list']' returned non-zero exit status 1.
"""

This error should be ignored when systemd is not running.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2080233

Title:
  [wsl] do-release-upgrade fails with systemd disabled

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

Bug description:
  Original report: https://github.com/ubuntu/WSL/issues/493

  On WSL, systemd is not always enabled. This is the case on WSL1 where
  it cannot be enabled and on WSL2 when it's been disabled or not
  enabled by default.

  When systemd is not available do-release-upgrade fails with the error
  below and upgrade is cancelled:

  """
  Traceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-uqmd8iby/noble", line 8, in <module>
      sys.exit(main())
    File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeMain.py", line 241, in main
      if app.run():
    File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeController.py", line 2642, in run
      return self.fullUpgrade()
    File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeController.py", line 2447, in fullUpgrade
      if not self.doPostInitialUpdate():
    File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeController.py", line 1438, in doPostInitialUpdate
      self.quirks.run("PostInitialUpdate")
    File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeQuirks.py", line 102, in run
      func()
    File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeQuirks.py", line 127, in noblePostInitialUpdate
      self._test_and_fail_on_tpm_fde()
    File "/tmp/ubuntu-release-upgrader-uqmd8iby/DistUpgrade/DistUpgradeQuirks.py", line 1898, in _test_and_fail_on_tpm_fde
      snap_list = subprocess.check_output(['snap', 'list'])
    File "/usr/lib/python3.10/subprocess.py", line 421, in check_output
      return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
    File "/usr/lib/python3.10/subprocess.py", line 526, in run
      raise CalledProcessError(retcode, process.args,
  subprocess.CalledProcessError: Command '['snap', 'list']' returned non-zero exit status 1.
  """

  This error should be ignored when systemd is not running.

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